US3777099A - Methods of heating an article in a microwave oven - Google Patents

Methods of heating an article in a microwave oven Download PDF

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US3777099A
US3777099A US00293006A US3777099DA US3777099A US 3777099 A US3777099 A US 3777099A US 00293006 A US00293006 A US 00293006A US 3777099D A US3777099D A US 3777099DA US 3777099 A US3777099 A US 3777099A
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microwave
article
heat
energy
absorptive
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/647Aspects related to microwave heating combined with other heating techniques
    • H05B6/6491Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors
    • H05B6/6494Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors for cooking
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00Heating by electric, magnetic or electromagnetic fields
    • H05B6/64Heating using microwaves
    • H05B6/6402Aspects relating to the microwave cavity

Definitions

  • This invention relates to an implement which in response to microwave irradiation is capable of processing and/or cooking a load. More particularly, this invention relates to an implement capable of converting microwave energy into heat energy which may thence be directed to an object to be processed.
  • Microwave ovens are extremely useful as cooking ovens; however, with conventional type microwave ovens, the searing, browning and crusting of foods constitutes a problem and requires either additional gas or electric heating elements in the microwave oven or the use of an externally located heating apparatus not related to the microwave oven. It is apparent that the heretofore methods employed for searing, browning and crusting are cumbersome, costly, time-consuming and generally unappealing to the users thereof.
  • one of the objects of this invention is a processfor converting microwave energy into heat energy.
  • Another object of this invention is to provide an implement directly associated with microwave ovens so as to lend versatility to the cooking of foodstuffs.
  • foodstuffs can be fried, roasted, grilled and baked with the desired crusting surface thereon.
  • Another object of this invention is to provide a microwave oven capable of cooking a foodstuff with a desired crusting surface thereon.
  • Still another object of this invention is to provide an implement for a microwave oven which, per se, is capable of acting as a dummy load for a microwave emitting source.
  • FIG. 1 is a cross-sectional view of the implement taking the form of a cooking utensil
  • FIG. 2 is a cross-sectional view of another embodiment of the implement taking the form of a hot cube
  • FIG. 3 is a cross-sectional side view of a microwave oven having incorporated'therein another embodiment of the implement in the form of a shelf;
  • FIG. 4 is a view taken along line 4 4 of FIG. 3;
  • FIG. 5 is a cross-sectional side view of a microwave oven having incorporated therein another embodiment of the implement in the form of a shelf;
  • FIG. 6 is a cross-sectional front view of a microwave oven having incorporated therein another embodiment of the implement in the form of two shelves;
  • FIG. 7 is a cross-sectional side view of a microwave oven having incorporated therein another embodiment of the implement in the form of an electrical charcoal grill.
  • FIG. 8 is a partial cross-sectional, plan view of another embodiment of the implement in the form of a grill-shelf.
  • an implement I is in the form of a cooking utensil and includes a body 10 which is permeable to microwave irradiation and preferable made of glass-ceramic type material, such as Pyroceram (manufactured by Corning Glass Works) or Cer- Vit (manufactured by Owens-Illinois).
  • body 10 Located within body 10 is a bed or layer of particles 11 of a resistive material supported on an insulating medium 12 which may be of a material such as GR25 (manufactured by General Refractories Company).
  • the heat conducting element 13, as illustrated in FIG. 1, preferably is a flat copper plate provided with openings 15-15 therethrough to permit the free random passage of microwave waves to and through the particles.
  • the heat conducting element 13 may be provided with a plurality of fins 16-16, as seen in phantom, which extend from the implement structure to cause a free release of heat therefrom.
  • a top processing surface 17, made of a material similar to body 10, is in contact with heat conducting element 13, and is attached to the body at 18 by a suitable adhesive.
  • the resistive particles 11 are, in actuality, a plurality of electrodes which support a plurality of spark gaps to discharge microwave energy therebetween.
  • the particles may be of a ferrite material having a high resistance to produce a relatively cool spark, when it is desired to use the implement as a household cooking utensil.
  • a carbon material which possesses low resistance and produces a relatively hot spark may be utilized, when the implement is desired to be used in a refractory process for vapourizing metals. With the latter, ultra high heat temperatures may be obtained when considering carbons melting point (approximately 6,500F).
  • the heat insulation 12 is of a material, such as described above,'which is permeable to microwave energy and not lossy or self-heating when exposed to microwave energy.
  • the heat insulation has a dual purpose; firstly, to direct the heat to the workload and, secondly, when the implement is used as a cooking utensil, to protect the cook and confine the heat generated by the arcing from a table subsequently receiving the implement.
  • the body or casing 10 it should be of a material, such as stated above, which is permeable to microwaves and not lossy or self-heating when exposed to microwave energy.
  • the body is used to protectively contain the fragile heat insulating material and the loose plie or layer of resistive particles.
  • the body or casing is constructed by sealing two portions together, one portion holding the particles and the other enclosing the particles and serving as a cooking surface.
  • heat conducting element 13 it is of a material, such as stated above, which is capable of equalizing the heat generated.
  • the heat conducting material may be of the same material as the resistive particles or of a material complementary thereto, such as copper having a low resistance and ferrite having a high resistance. It is apparent, however, that materials having a low melting point, such as aluminum, may not be used with materials having a high melting point, such as carbon, when temperatures in excess of the low melting point material are required.
  • the implement In operation, the implement is located in a suitable microwave cavity (not shown) and exposed to microwave irradiation, the microwaves contacting the particles 11. In response thereto, a plurality of electric arcs are generated throughout and between the particles 11 and the heat conducting element 13. Within a relatively short time, the particle bed appears as a glowing bed of coal emitting a high degree of heat in excess of 1,000F. The amount of heat generated is dependent upon the amount and size of the resistive particles, the quantity of the released microwave energy and the time. The microwave arcing tends to terminate the released microwave power and, as a result, precludes a sufficient degree of reflection of microwave power back to the source, thereby preventing any damage thereto. It is apparent that the higher the output power of the microwave generator, the more resistive particles required to properly terminate it.
  • FIG. 2 is illustrative of another embodiment of the implement, referred to as I which takes the form of a hot cube.
  • Implement I includes an outer coating of a suitable microwave permeable material, such as glass-ceramic, epoxy and, in this instance, preferably cardboard.
  • a simple heat insulating material 12b such as sand concrete or castable refractory material, is located within the outer coating 10b and completely envelops a bed of resistive particles 1 1b of a material such as a relatively inexpensive high-grade iron ore.
  • the heat stored within the hot cube releases and can be used advantageously as a warmer for articles or animals.
  • the hot cube may be easily inserted into insulating containers (not shown) whereupon the stored heat releases from the hot cube to heat or cook a foodstuff in proximity thereto.
  • the hot cube may serve as a body warmer for people.
  • the duration of the released heat is commensurate with the size and type of insulation coupled with the quantity of microwave irradiation of the particle bed.
  • such in view of this low cost of fabricating a hot cube", such may be marketed as a disposable item.
  • the implement also may take the form of a shelf or shelves in a imcrowave oven.
  • a microwave oven 25 which is provided with a conventional microwave source 26, such as a generator or magnetron, for supplying microwave energy into cavity 27 through waveguide 28.
  • An implement, generally referred to as I takes the form of a shelf and includes a supporting element 30 for holding a ceramic type body 10c. Located within the body is an insulating medium 12c having positioned thereon a plurality of resitive particles 110.
  • a heat conducting element 13c having an opening extending therethrough, is disposed in contact with the particles and the top portion of body 100, the top portion 17c being capable of receiving a foodstuff F thereon through closure 31.
  • the supporting element 30 is pivotally adjustable at pivot 32 located near the rearmost portion of the oven and is provided with cooperating adjustable pins 33 near the foremost portion of the oven for insertion into various openings 34-34 for locking the implement-shelf 1;, in a desired angular position.
  • any by-products of cooking, such as rendered fat, which results from the operation of the microwaves and implement as previously described, will pass by gravity through opening 35 of a downwardly converging bottom 36 into a portable container 37 for subsequent use or disposal.
  • FIG. 5 there is illustrated another embodiment of the invention wherein the implement, referred to as I takes the form of an upper shelf in an oven 25d.
  • the oven is similar to the oven in FIGS. 3 and 4 with the exception that the implement-shelf I is in an inverted position.
  • the implement-shelf l rests on supporting elements 33d-33d and includes a bottom ceramic or quartz radiant panel 10d.
  • An insulating medium 12d is provided on the top side of the shelf and houses a bed of resistive particles 11d therein.
  • the insulating medium 12d herein takes on the added function of dividing the oven cavity so as to create a hot lower cavity and a relatively cooler upper cavity.
  • a conventional bottom shelf 35 premeable to microwave energy, is provided on supporting elements 36-36 for holding a utensil 37 with a foodstuff, f, thereon.
  • the microwave generator is turned on and the implement shelf i is preheated until the radiant panel 10d becomes hot, whereupon a foodstuff is placed under the radiant shelf.
  • the foodstuff is cooked from both the microwave irradiation and the infra red radiation.
  • the implement-shelf 1 may be modified by conventional means to be movable, thus enabling the implement-shelf to be positioned into intimate contact with the foodstuff for a suitable period of time.
  • FIG. 6 discloses still another embodiment of the invention wherein the implement, referred to as 1 -1 takes the form of a pair of implement-shelves which may either be fixed or mobable with respect to each other.
  • the implement referred to as 1 -1 takes the form of a pair of implement-shelves which may either be fixed or mobable with respect to each other.
  • lower implement-shelf I rests on adjustable supporting elements 332 and is provided with a bottom portion 12c, a bed of particles lle and a top insulating portion 10:: which cooperates with the bottom portion to encase the particle bed.
  • upper implement-shelf I rests on adjustable supporting elements 33e and is provided with a top portion s, a bed of resistive particles lie, and a bottom insulating portion 12e which encases the particle bed in cooperation with the top portion.
  • a rotating spit 40 driven by a chain 41 connected to a motor (not shown) may be employed.
  • the implement shelves l -l may be moved as desired, i.e., towards each other, either separately or together or into contacting or nearly contacting relationships with the foodstuff F to obtain additional crusting on opposite sides thereof, in a similar manner as discussed with respect to FIG. 5. It should be noted that while manual means are illustated to show relative movement of the shelves, suitable conventional mechanical or electromechanical means may be employed without departing from the invention.
  • FIG. 7 discloses still another embodiment of the invention and in its simplest structure, wherein the implement, referred to as 1 takes the form of a microwave charcoal grill.
  • Implement I is comprised of a body 10f having a plurality of resistive particles 11f therein.
  • a ceramic or metallic grill 43 illustrated with a foodstuff F thereon, may either be placed on or above the particle bed 11f.
  • a microwave irradiation source 26f is located in the bottom portion of the oven 25f and, when energized, emits waves through waveguide 27f.
  • the top portion of the oven is provided with a grid 45 having relatively small openings 46-46.
  • the openings 46-46 are sufficiently small so as to confine microwave energy therein, yet sufficiently large to permit the passage of air therethrough for disposal of by-products of combustion.
  • conversion of the microwave energy into heat energy results in a similar manner as hereinbefore described.
  • the resistive particles llf are of a material, such as carbon, which will ignite when heated in the presence of air, the burning carbon, buring fat and the microwave energy will swiftly barbeque the foodstuff F.
  • FIG. 8 discloses still another inventive implement wherein the implement, referred to as I is capable of taking the form of a grill-shelf which may be used as a substitute for implemnt shelf l illustrated in FIG. 3.
  • a ceramic frame 50 holds hollow ceramic or quartz tubes 51 filled with a plurality of resistive particles 52.
  • grill shelf 1 In operation, grill shelf 1, is positioned in a microwave oven and preheated whereupon a foodstuff, such as a frozen steak, is placed thereon. With the aid of the energy from the microwave source, the steak is defrosted and cooked with a resultant grill pattern thereon which is similar to that obtained in prior art steak grilling, the gravy juice being collected in container 37. Additionally, the ceramic frame implement I remains cool and can be easily transported with the steak thereon to a receiving table.
  • a foodstuff such as a frozen steak
  • a method of heating an article in an oven chamber receptive to microwave energy comprising:
  • microwave absorptive member exposing said microwave absorptive member to microwave energy until it absorbs and so converts said microwave energy (into) to heat energy and said heat conducting member conducts said generated heat energy to said article.
  • a method of barbecuing a foodstuff in an oven chamber receptive to microwave energy which comprises:
  • microwave absorptive member exposing said microwave absorptive member to microwave energy until it absorbs and so converts said microwave energy to heat energy to a temperature at least high enough to heat render combustible by-products from said article and high enough to kindle said combustible heat rendered byproducts, and
  • a method of heating an article in an oven chamber receptive to microwave energy which comprises:
  • microwave absorptive, combustible material exposing said microwave absorptive, combustible material to microwave energy until it absorbs and so converts said microwave energy to heat energy and heats to its ignition temperature and is set on fire
  • a method of heating an implement and storing said heat within said implement while in an oven chamber receptive to microwave energy for subsequent use of said heated implement at a location external said oven chamber which comprises:
  • a method of heating an article in an oven chamber receptive to microwave energy which includes the steps of:
  • said implement comprises a body which is at least partially microwave permeable and microwave non-absorptive enclosing a pocket of microwave energy absorptive material, within said oven chamber for a predetermined time while said pocket of microwave energy absorptive material absorbs and so converts said microwave energy to heat energy,
  • a method of heating an article in an oven chamber receptive to microwave energy which includes the steps of:
  • said implement comprising:
  • a heat insulator located on the reverse side of said microwave-absorptive material to contain and direct heat released by said microwaveabsorptive material which heat would otherwise not reach said heating utensil, onto said heating utensil;
  • a method of heating an article according to claim 9, where said heating utensil is a glass-ceramic cooking utensil and said article is a foodstuff.
  • a method of heating an article in a microwave oven which comprises:

Abstract

Methods of heating an article using microwave absorptive material, microwave absorptive combustible material, microwave nonabsorptive material, heat insulating material and/or heat conducting material are described. A process and an implement for converting microwave energy into heat energy which includes a body having a plurality of resistive particles therein. Upon subjecting the particles to microwave irradiation, a plurality of electric arcs are generated throughout the particles, thereby resulting in the microwave energy being converted into heat energy, and the electric arcs serving as a load for the microwave irradiation source. The implement is particularly useful with microwave ovens.

Description

I United States Patent 1191 1111 3,777,099 Levinson 1 Dec. 4, 1973 [54] METHODS OF HEATING AN ARTICLE IN A 3,182,164 5/1965 lronfield 219 1055 MICROWAVE OVEN FOREIGN PATENTS 0R APPLICATIONS Inventor: Melvin Levinson, 1 Meinzer 1,049,019 1/1959 Germany 219/1055 Avenel, NJ. 07001 s p 2 Prirrmry Examir ler l. Truhe l N 293 006 Assistant Exammer-J-lugh D. Jaeger [21] App 0.:
Related US. Application Data RACT [60] Division of Ser, No. 704,389, Feb. 9, 1968, Pat. No. Me h f heating an ar icle using microwave ab- 3,701,872, which is a continuation-in-part of Ser. No. sorptive material, microwave absorptive combustible u y 1965, abandonfid, and a material, microwave nonabsorptive material, heat incommuauon-m'part of $91 483,144 27, sulating material and/or heat conducting material are 1965, abandoned. described 52 us. c1. 219/1055 Pmcess and f imp'emem 51 1111. C1. "05b 9/06 energy Ff mcludes, 581 Field of Search 219/1041, 10.51, body a Plural'ty PamclesI them 219/10 55 1065 Upon sub ectlng the particles to microwave irradiation, a plurality of electric arcs are generated 961 m1c wav energy e1 g c e 1 e e gy, UNITED STATES PATENTS and the electric arcs serving as a load for the 2,830,162 4/1958 Copsm et a1 219/1055 microwave irradiation Source The implement is wi ex f particularly useful with microwave ovens. 1 e 3,420,923 1/ 1969 Ashworth et al..' 219/ 10.55 UX 13 Claims, 8 Drawing Figures j \\\\Lk\ METHODS OF HEATING AN ARTICLE IN A MICROWAVE OVEN CROSS-REFERENCES TO RELATED APPLICATIONS This application is a division of application Ser. No.
704,389 filed Feb. 9, 1968, now Pat. No. 3,701,872
which in turn is a continuation-in-part of Ser. No. 470,809, filed July 9, 1965 now abandoned and a continuation-in-part of Ser. No. 483,144 filed Aug. 27, 1965, now abandoned.
BACKGROUND OF THE INVENTION This invention relates to an implement which in response to microwave irradiation is capable of processing and/or cooking a load. More particularly, this invention relates to an implement capable of converting microwave energy into heat energy which may thence be directed to an object to be processed.
Microwave ovens are extremely useful as cooking ovens; however, with conventional type microwave ovens, the searing, browning and crusting of foods constitutes a problem and requires either additional gas or electric heating elements in the microwave oven or the use of an externally located heating apparatus not related to the microwave oven. It is apparent that the heretofore methods employed for searing, browning and crusting are cumbersome, costly, time-consuming and generally unappealing to the users thereof.
Accordingly, one of the objects of this invention is a processfor converting microwave energy into heat energy.
Another object of this invention is to provide an implement directly associated with microwave ovens so as to lend versatility to the cooking of foodstuffs. Advantageously, foodstuffs can be fried, roasted, grilled and baked with the desired crusting surface thereon.
Another object of this invention is to provide a microwave oven capable of cooking a foodstuff with a desired crusting surface thereon.
Still another object of this invention is to provide an implement for a microwave oven which, per se, is capable of acting as a dummy load for a microwave emitting source.
SUMMARY OF THE INVENTION According to the objects of'this invention, an implement, preferably taking the form of a cooling utensil or mocrowave oven shelf, is provided with a plurality of wave source BRIEF DESCRIPTION OF THE DRAWINGS Otherobjects and a fuller understanding of the invention may be had by referring to the drawings wherein:
FIG. 1 is a cross-sectional view of the implement taking the form of a cooking utensil;
FIG. 2 is a cross-sectional view of another embodiment of the implement taking the form of a hot cube;
FIG. 3 is a cross-sectional side view of a microwave oven having incorporated'therein another embodiment of the implement in the form of a shelf;
FIG. 4 is a view taken along line 4 4 of FIG. 3;
FIG. 5 is a cross-sectional side view of a microwave oven having incorporated therein another embodiment of the implement in the form of a shelf;
FIG. 6 is a cross-sectional front view of a microwave oven having incorporated therein another embodiment of the implement in the form of two shelves;
FIG. 7 is a cross-sectional side view of a microwave oven having incorporated therein another embodiment of the implement in the form of an electrical charcoal grill; and
FIG. 8 is a partial cross-sectional, plan view of another embodiment of the implement in the form of a grill-shelf.
DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the drawings, it will be apparent that the inventive implement may be constructed and utilized in various embodiments. According to one embodiment, as seen in FIG. 1, an implement I, is in the form of a cooking utensil and includes a body 10 which is permeable to microwave irradiation and preferable made of glass-ceramic type material, such as Pyroceram (manufactured by Corning Glass Works) or Cer- Vit (manufactured by Owens-Illinois). Located within body 10 is a bed or layer of particles 11 of a resistive material supported on an insulating medium 12 which may be of a material such as GR25 (manufactured by General Refractories Company). A good heat conducting element 13, in the form of a plate, copper strips, rods, etc., is preferably located in contact with the particle bed 11. The heat conducting element 13, as illustrated in FIG. 1, preferably is a flat copper plate provided with openings 15-15 therethrough to permit the free random passage of microwave waves to and through the particles. In the event it is desired to utilize implement I, as a dummy load, per se, for a microwave emitting source, the heat conducting element 13 may be provided with a plurality of fins 16-16, as seen in phantom, which extend from the implement structure to cause a free release of heat therefrom. A top processing surface 17, made of a material similar to body 10, is in contact with heat conducting element 13, and is attached to the body at 18 by a suitable adhesive.
It has been found that the resistive particles 11 are, in actuality, a plurality of electrodes which support a plurality of spark gaps to discharge microwave energy therebetween. There are innumerable solid metals which will support an electric gap or arc. For example, the particles may be of a ferrite material having a high resistance to produce a relatively cool spark, when it is desired to use the implement as a household cooking utensil. On the other hand, a carbon material which possesses low resistance and produces a relatively hot spark may be utilized, when the implement is desired to be used in a refractory process for vapourizing metals. With the latter, ultra high heat temperatures may be obtained when considering carbons melting point (approximately 6,500F).
With respect to the heat insulation 12, it is of a material, such as described above,'which is permeable to microwave energy and not lossy or self-heating when exposed to microwave energy. The heat insulation has a dual purpose; firstly, to direct the heat to the workload and, secondly, when the implement is used as a cooking utensil, to protect the cook and confine the heat generated by the arcing from a table subsequently receiving the implement.
Regarding the body or casing 10, it should be of a material, such as stated above, which is permeable to microwaves and not lossy or self-heating when exposed to microwave energy. The body is used to protectively contain the fragile heat insulating material and the loose plie or layer of resistive particles. Generally, the body or casing is constructed by sealing two portions together, one portion holding the particles and the other enclosing the particles and serving as a cooking surface.
With respect to heat conducting element 13, it is of a material, such as stated above, which is capable of equalizing the heat generated. The heat conducting material may be of the same material as the resistive particles or of a material complementary thereto, such as copper having a low resistance and ferrite having a high resistance. It is apparent, however, that materials having a low melting point, such as aluminum, may not be used with materials having a high melting point, such as carbon, when temperatures in excess of the low melting point material are required.
In operation, the implement is located in a suitable microwave cavity (not shown) and exposed to microwave irradiation, the microwaves contacting the particles 11. In response thereto, a plurality of electric arcs are generated throughout and between the particles 11 and the heat conducting element 13. Within a relatively short time, the particle bed appears as a glowing bed of coal emitting a high degree of heat in excess of 1,000F. The amount of heat generated is dependent upon the amount and size of the resistive particles, the quantity of the released microwave energy and the time. The microwave arcing tends to terminate the released microwave power and, as a result, precludes a sufficient degree of reflection of microwave power back to the source, thereby preventing any damage thereto. It is apparent that the higher the output power of the microwave generator, the more resistive particles required to properly terminate it.
FIG. 2 is illustrative of another embodiment of the implement, referred to as I which takes the form of a hot cube. Implement I includes an outer coating of a suitable microwave permeable material, such as glass-ceramic, epoxy and, in this instance, preferably cardboard. A simple heat insulating material 12b, such as sand concrete or castable refractory material, is located within the outer coating 10b and completely envelops a bed of resistive particles 1 1b of a material such as a relatively inexpensive high-grade iron ore.
After exposure to microwave irradiation, the heat stored within the hot cube releases and can be used advantageously as a warmer for articles or animals. For example, the hot cube may be easily inserted into insulating containers (not shown) whereupon the stored heat releases from the hot cube to heat or cook a foodstuff in proximity thereto. Similarly, the hot cube may serve as a body warmer for people. The duration of the released heat is commensurate with the size and type of insulation coupled with the quantity of microwave irradiation of the particle bed. Significantly, in view of this low cost of fabricating a hot cube", such may be marketed as a disposable item.
While the implement has heretofore been discussed with respect to its use as a portable type article; namely a cooking utensil, hot cube, body warmer and the like,
the implement also may take the form of a shelf or shelves in a imcrowave oven. As seen in FIG. 3 and 4, there is illustrated a microwave oven 25 which is provided with a conventional microwave source 26, such as a generator or magnetron, for supplying microwave energy into cavity 27 through waveguide 28. An implement, generally referred to as I takes the form of a shelf and includes a supporting element 30 for holding a ceramic type body 10c. Located within the body is an insulating medium 12c having positioned thereon a plurality of resitive particles 110. A heat conducting element 13c, having an opening extending therethrough, is disposed in contact with the particles and the top portion of body 100, the top portion 17c being capable of receiving a foodstuff F thereon through closure 31.
The supporting element 30 is pivotally adjustable at pivot 32 located near the rearmost portion of the oven and is provided with cooperating adjustable pins 33 near the foremost portion of the oven for insertion into various openings 34-34 for locking the implement-shelf 1;, in a desired angular position. As a result of the angular position of the implement-shelf I any by-products of cooking, such as rendered fat, which results from the operation of the microwaves and implement as previously described, will pass by gravity through opening 35 of a downwardly converging bottom 36 into a portable container 37 for subsequent use or disposal.
As seen in FIG. 5, there is illustrated another embodiment of the invention wherein the implement, referred to as I takes the form of an upper shelf in an oven 25d. The oven is similar to the oven in FIGS. 3 and 4 with the exception that the implement-shelf I is in an inverted position. As seen in FIG. 5, the implement-shelf l rests on supporting elements 33d-33d and includes a bottom ceramic or quartz radiant panel 10d. An insulating medium 12d is provided on the top side of the shelf and houses a bed of resistive particles 11d therein. The insulating medium 12d herein takes on the added function of dividing the oven cavity so as to create a hot lower cavity and a relatively cooler upper cavity. A conventional bottom shelf 35, premeable to microwave energy, is provided on supporting elements 36-36 for holding a utensil 37 with a foodstuff, f, thereon.
The operation is similar to that previously described with respect to the oven in FIGS. 3 and 4. Typically, the microwave generator is turned on and the implement shelf i is preheated until the radiant panel 10d becomes hot, whereupon a foodstuff is placed under the radiant shelf. The foodstuff is cooked from both the microwave irradiation and the infra red radiation. Additionally, if an extra heavy, relatively darker crust is desired on the foodstuff, e.g. one which is cooked rare, the implement-shelf 1;, may be modified by conventional means to be movable, thus enabling the implement-shelf to be positioned into intimate contact with the foodstuff for a suitable period of time.
FIG. 6 discloses still another embodiment of the invention wherein the implement, referred to as 1 -1 takes the form of a pair of implement-shelves which may either be fixed or mobable with respect to each other. As seen therein, lower implement-shelf I rests on adjustable supporting elements 332 and is provided with a bottom portion 12c, a bed of particles lle and a top insulating portion 10:: which cooperates with the bottom portion to encase the particle bed. Similarly, upper implement-shelf I rests on adjustable supporting elements 33e and is provided with a top portion s, a bed of resistive particles lie, and a bottom insulating portion 12e which encases the particle bed in cooperation with the top portion. Optionally, a rotating spit 40 driven by a chain 41 connected to a motor (not shown) may be employed.
The implement shelves l -l may be moved as desired, i.e., towards each other, either separately or together or into contacting or nearly contacting relationships with the foodstuff F to obtain additional crusting on opposite sides thereof, in a similar manner as discussed with respect to FIG. 5. It should be noted that while manual means are illustated to show relative movement of the shelves, suitable conventional mechanical or electromechanical means may be employed without departing from the invention.
FIG. 7 discloses still another embodiment of the invention and in its simplest structure, wherein the implement, referred to as 1 takes the form of a microwave charcoal grill. Implement I is comprised of a body 10f having a plurality of resistive particles 11f therein. Typically, a ceramic or metallic grill 43, illustrated with a foodstuff F thereon, may either be placed on or above the particle bed 11f.
A microwave irradiation source 26f is located in the bottom portion of the oven 25f and, when energized, emits waves through waveguide 27f. The top portion of the oven is provided with a grid 45 having relatively small openings 46-46. The openings 46-46 are sufficiently small so as to confine microwave energy therein, yet sufficiently large to permit the passage of air therethrough for disposal of by-products of combustion. Upon energization of the microwave source 26f, conversion of the microwave energy into heat energy results in a similar manner as hereinbefore described. It should be noted that if the resistive particles llf are of a material, such as carbon, which will ignite when heated in the presence of air, the burning carbon, buring fat and the microwave energy will swiftly barbeque the foodstuff F.
FIG. 8 discloses still another inventive implement wherein the implement, referred to as I is capable of taking the form of a grill-shelf which may be used as a substitute for implemnt shelf l illustrated in FIG. 3. Here a ceramic frame 50 holds hollow ceramic or quartz tubes 51 filled with a plurality of resistive particles 52.
In operation, grill shelf 1,, is positioned in a microwave oven and preheated whereupon a foodstuff, such as a frozen steak, is placed thereon. With the aid of the energy from the microwave source, the steak is defrosted and cooked with a resultant grill pattern thereon which is similar to that obtained in prior art steak grilling, the gravy juice being collected in container 37. Additionally, the ceramic frame implement I remains cool and can be easily transported with the steak thereon to a receiving table.
it is to be understood that the above described arrangements of the various implements are illustrative of the application of the principal of the invention, each implement employing, at least, a plurality of resistive particles therein capable of receiving and converting microwave energy into heat energy. Numerous other arrangements may be devised by those skilled in the art present invention is to be limited only by the spirit and scope of the appended claims.
I claim:
1. A method of heating an article in an oven chamber receptive to microwave energy comprising:
locating within said chamber a microwave absorptive member,
locating a heat conducting member in (a preselected relationship) contact with said absorptive member and between said microwave absorptive member and said article, and
exposing said microwave absorptive member to microwave energy until it absorbs and so converts said microwave energy (into) to heat energy and said heat conducting member conducts said generated heat energy to said article.
2. A method of barbecuing a foodstuff in an oven chamber receptive to microwave energy which comprises:
locating a microwave absorptive member within said oven chamber,
locating said foodstuff where said microwave absorptive member, when heated, will be in position to heat said foodstuff and where at least a portion of any conbustible heat rendered by-products of said foodstuff will contact said mocrowave absorptive member,
exposing said microwave absorptive member to microwave energy until it absorbs and so converts said microwave energy to heat energy to a temperature at least high enough to heat render combustible by-products from said article and high enough to kindle said combustible heat rendered byproducts, and
additionally heating said foodstuff by the heat of rapid combustion of said kindled combustible heat rendered by-products.
3. A method of heating an article in an oven chamber receptive to microwave energy which comprises:
locating a microwave absorptive, combustible material in said oven chamber,
exposing said microwave absorptive, combustible material to microwave energy until it absorbs and so converts said microwave energy to heat energy and heats to its ignition temperature and is set on fire, and
locating said article in a predetermine position where said article will be heated by the dual heating of both the heat of combustion of said burning microwave absorptive, combustible material and, as it is released from said material, heat converted from said microwave exposure of said microwave absorptive, combustible material by said exposure of said material to microwave energy.
4. In a method, according to claim 3, the added step of:
locating a heat conductive member in contact with said article and between said article and said burning microwave absorptive, combustible material whereat to collect and conduct to said article heat energy released by said burning microwave absorptive, combustible material on said exposure to microwave energy.
5. A method of heating an implement and storing said heat within said implement while in an oven chamber receptive to microwave energy for subsequent use of said heated implement at a location external said oven chamber which comprises:
locating said implement, said implement comprising a microwave absorptive member located within a microwave non-absorptive, heat insulating member, within said oven chamber, exposing said implement to microwave energy for a predetermined time while said microwave energy absorptive material absorbs and so converts said microwave energy to heat energy, and transferring said heated implement to a location exterior said oven chamber, and exposing, at said exterior location, an article to said stored heat as it is released from said heated microwave absorptive member by said heat insulating member. 6. A method of heating an article in an oven chamber receptive to microwave energy which includes the steps of:
exposing to microwave energy an implement, where said implement comprises a body which is at least partially microwave permeable and microwave non-absorptive enclosing a pocket of microwave energy absorptive material, within said oven chamber for a predetermined time while said pocket of microwave energy absorptive material absorbs and so converts said microwave energy to heat energy,
. and subsequently locating said article to be heated on said heated body thereby heating said article from said heat energy as it is released from said microwave absorptive material.
7. In a method of heating an article, according to claim 6, the added step of:
exposing said implement with said article thereupon for an additional predetermined time to microwave energy to heat the interior of said article by said direct exposure to microwave energy and heating the surface of said article in contact with said implement by the dual heating of both heat newly converted from said exposure to microwave energy within said articles surface and from heat newly converted and released from said pocket of microwave energy absorptive material.
8. In a method of heating an article, according to claim 6, the added step of:
locating a microwave non-absorptive heat insulating material in a predetermined position with respect to said pocket of microwave absorptive material to contain, build up and direct said heat energy, which otherwise would not reach said article, onto said article.
9. A method of heating an article in an oven chamber receptive to microwave energy which includes the steps of:
locating a heating implement, within said chamber,
said implement comprising:
a microwave-absorptive material,
a microwave-nonabsorptive, heating utensil, lo-
cated in contact with an obverse surface of said microwave-absorptive material, heated by heat released by said microwave-absorptive material, and
a heat insulator located on the reverse side of said microwave-absorptive material to contain and direct heat released by said microwaveabsorptive material which heat would otherwise not reach said heating utensil, onto said heating utensil;
exposing said heating implement to microwave energy for a predetermined time while said microwave-absorptive material absorbs and so converts said microwave energy to heat energy; and
subsequently 1 locating said article on said heating utensil thereby heating said article from said heat energy as it is, in
turn, released by said heating utensil.
10. A method of heating an article, according to claim 9, where said heating utensil is a glass-ceramic cooking utensil and said article is a foodstuff.
11. A method of heating an article in a microwave oven which comprises:
exposing a body which has a plurality of spark gap electrodes therein to microwave energy thereby causing an electric discharge between adjacent electrodes and resulting in said microwave energy converting to heat energy, and
locating said article in predetermined relationship with said discharge path to subject said article to said heat energy and to heat said article thereby. 12. In a method of heating an article, according to claim 11, where said body comprises heat insulating material which contains and directs heat which otherwise would not reach said article onto said article.
13. In a method of heating an article, according to claim 12, which further includes:
locating a heat conductive element in contact with said article and between said article and said electric discharge whereupon said heat energy is more equally transferred from around said electric discharge to said article.
l II

Claims (13)

1. A method of heating an article in an oven chamber receptive to microwave energy comprising: locating within said chamber a microwave absorptive member, locating a heat conducting member in (a preselected relationship) contact with said absorptive member and between said microwave absorptive member and said article, and exposing said microwave absorptive member to microwave energy until it absorbs and so converts said microwave energy (into) to heat energy and said heat conducting member conducts said generated heat energy to said article.
2. A method of barbecuing a foodstuff in an oven chamber receptive to microwave energy which comprises: locating a microwave absorptive member within said oven chamber, locating said foodstuff where said microwave absorptive member, when heated, will be in position to heat said foodstuff and where at least a portion of any conbustible heat rendered by-products of said foodstuff will contact said mocrowave absorptive member, exposing said microwave absorptive member to microwave energy until it absorbs and so converts said microwave energy to heat energy to a temperature at least high enough to heat render combustible by-products from said artIcle and high enough to kindle said combustible heat rendered by-products, and additionally heating said foodstuff by the heat of rapid combustion of said kindled combustible heat rendered by-products.
3. A method of heating an article in an oven chamber receptive to microwave energy which comprises: locating a microwave absorptive, combustible material in said oven chamber, exposing said microwave absorptive, combustible material to microwave energy until it absorbs and so converts said microwave energy to heat energy and heats to its ignition temperature and is set on fire, and locating said article in a predetermine position where said article will be heated by the dual heating of both the heat of combustion of said burning microwave absorptive, combustible material and, as it is released from said material, heat converted from said microwave exposure of said microwave absorptive, combustible material by said exposure of said material to microwave energy.
4. In a method, according to claim 3, the added step of: locating a heat conductive member in contact with said article and between said article and said burning microwave absorptive, combustible material whereat to collect and conduct to said article heat energy released by said burning microwave absorptive, combustible material on said exposure to microwave energy.
5. A method of heating an implement and storing said heat within said implement while in an oven chamber receptive to microwave energy for subsequent use of said heated implement at a location external said oven chamber which comprises: locating said implement, said implement comprising a microwave absorptive member located within a microwave non-absorptive, heat insulating member, within said oven chamber, exposing said implement to microwave energy for a predetermined time while said microwave energy absorptive material absorbs and so converts said microwave energy to heat energy, and transferring said heated implement to a location exterior said oven chamber, and exposing, at said exterior location, an article to said stored heat as it is released from said heated microwave absorptive member by said heat insulating member.
6. A method of heating an article in an oven chamber receptive to microwave energy which includes the steps of: exposing to microwave energy an implement, where said implement comprises a body which is at least partially microwave permeable and microwave non-absorptive enclosing a pocket of microwave energy absorptive material, within said oven chamber for a predetermined time while said pocket of microwave energy absorptive material absorbs and so converts said microwave energy to heat energy, and subsequently locating said article to be heated on said heated body thereby heating said article from said heat energy as it is released from said microwave absorptive material.
7. In a method of heating an article, according to claim 6, the added step of: exposing said implement with said article thereupon for an additional predetermined time to microwave energy to heat the interior of said article by said direct exposure to microwave energy and heating the surface of said article in contact with said implement by the dual heating of both heat newly converted from said exposure to microwave energy within said article''s surface and from heat newly converted and released from said pocket of microwave energy absorptive material.
8. In a method of heating an article, according to claim 6, the added step of: locating a microwave non-absorptive heat insulating material in a predetermined position with respect to said pocket of microwave absorptive material to contain, build up and direct said heat energy, which otherwise would not reach said article, onto said article.
9. A method of heating an article in an oven chamber receptive to microwave energy which includes the steps of: locating a heating implement, within said chamber, said implement comprising: a microwave-absorptive material, a microwave-nonabsorptive, heating utensil, located in contact with an obverse surface of said microwave-absorptive material, heated by heat released by said microwave-absorptive material, and a heat insulator located on the reverse side of said microwave-absorptive material to contain and direct heat released by said microwave-absorptive material which heat would otherwise not reach said heating utensil, onto said heating utensil; exposing said heating implement to microwave energy for a predetermined time while said microwave-absorptive material absorbs and so converts said microwave energy to heat energy; and subsequently locating said article on said heating utensil thereby heating said article from said heat energy as it is, in turn, released by said heating utensil.
10. A method of heating an article, according to claim 9, where said heating utensil is a glass-ceramic cooking utensil and said article is a foodstuff.
11. A method of heating an article in a microwave oven which comprises: exposing a body which has a plurality of spark gap electrodes therein to microwave energy thereby causing an electric discharge between adjacent electrodes and resulting in said microwave energy converting to heat energy, and locating said article in predetermined relationship with said discharge path to subject said article to said heat energy and to heat said article thereby.
12. In a method of heating an article, according to claim 11, where said body comprises heat insulating material which contains and directs heat which otherwise would not reach said article onto said article.
13. In a method of heating an article, according to claim 12, which further includes: locating a heat conductive element in contact with said article and between said article and said electric discharge whereupon said heat energy is more equally transferred from around said electric discharge to said article.
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Cited By (35)

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US3941967A (en) * 1973-09-28 1976-03-02 Asahi Kasei Kogyo Kabushiki Kaisha Microwave cooking apparatus
US4140887A (en) * 1977-05-09 1979-02-20 Special Metals Corporation Method for microwave heating
US4190757A (en) * 1976-10-08 1980-02-26 The Pillsbury Company Microwave heating package and method
US4210674A (en) * 1978-12-20 1980-07-01 American Can Company Automatically ventable sealed food package for use in microwave ovens
US4272663A (en) * 1979-08-10 1981-06-09 Green Robert E Method and apparatus for cooking
US4303455A (en) * 1980-03-14 1981-12-01 Rockwell International Corporation Low temperature microwave annealing of semiconductor devices
US4306133A (en) * 1979-02-14 1981-12-15 Levinson Melvin L Microwave pie baking
US4404241A (en) * 1979-12-19 1983-09-13 James River-Dixie/Northern, Inc. Microwave package with vent
US4471195A (en) * 1980-08-07 1984-09-11 Tokyo Shibaura Denki Kabushiki Kaisha Food receptacle for microwave ovens
US4529855A (en) * 1982-04-12 1985-07-16 Henry Fleck Microwave radiation detector
US4701585A (en) * 1986-04-04 1987-10-20 Kidde Consumer Durables Corp. Microwave browning cookware
US4705927A (en) * 1986-08-14 1987-11-10 Aluminum Company Of America Cooking utensil for combined microwave and steam cooking
US4891482A (en) * 1988-07-13 1990-01-02 The Stouffer Corporation Disposable microwave heating receptacle and method of using same
US5079398A (en) * 1989-11-27 1992-01-07 Pre Finish Metals Incorporated Container with ferrite coating and method of making ferrite-coated sheet
US5139826A (en) * 1989-11-27 1992-08-18 Pre Finish Metals, Incorporated Container with ferrite coating and method of making ferrite-coated sheet
US5144107A (en) * 1990-04-11 1992-09-01 The Stouffer Corporation Microwave susceptor sheet stock with heat control
US5202541A (en) * 1991-01-28 1993-04-13 Alcan International Limited Microwave heating of workpieces
US5229563A (en) * 1990-01-11 1993-07-20 Matsushita Electric Industrial Co., Ltd. Pressure cooker
US5254822A (en) * 1990-08-10 1993-10-19 Naraseiki Kabushiki Kaisha Electronic combustion furnace
US5296666A (en) * 1992-05-04 1994-03-22 The Pennsylvania Research Corporation Microwave heating apparatus having two cavities and method of using the same
US5519196A (en) * 1995-06-01 1996-05-21 Xu; Liming Material for converting microwave energy into thermal energy, and a cooking receptacle fabricated from that material
US5593610A (en) * 1995-08-04 1997-01-14 Hormel Foods Corporation Container for active microwave heating
WO2003063663A1 (en) * 2002-01-31 2003-08-07 Matsushita Electric Industrial Co., Ltd. Cooker for high-frequency heating apparatus
US20040222554A1 (en) * 2002-05-29 2004-11-11 Akopyan Razmik L. Microwave molding of polymers
US20050184434A1 (en) * 2002-05-29 2005-08-25 Razmik Akopyan Injection molding of polymers by microwave heating
US6984352B1 (en) 2002-05-29 2006-01-10 Akopyan Razmik L Dielectric mold for uniform heating and molding of polymers and composites in microwave ovens
US20060237451A1 (en) * 2002-07-26 2006-10-26 Sameuls Michael R Ovenware for microwave oven
US20090121798A1 (en) * 2007-08-10 2009-05-14 Melvin Leroy Levinson High power microwave waste management
US20100077615A1 (en) * 2008-09-26 2010-04-01 Foxconn Technology Co., Ltd. Method for manufacturing a plate-type heat pipe
US20110168156A1 (en) * 2004-06-30 2011-07-14 Philippe Clement Microwave Ignition Method and Device For Cooking Appliances Using Solid Fuel
US8980984B2 (en) 2009-07-24 2015-03-17 Ticona Llc Thermally conductive polymer compositions and articles made therefrom
US9090751B2 (en) 2009-07-24 2015-07-28 Ticona Llc Thermally conductive thermoplastic resin compositions and related applications
US10791871B2 (en) 2014-03-17 2020-10-06 Jong Peter Park Travel mug for microwave oven
US10800591B1 (en) 2019-12-23 2020-10-13 Thister Inc. Beverage preparation composition and package
US20210274608A1 (en) * 2018-07-03 2021-09-02 Andrew Clive Wright Cooking Device

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941967A (en) * 1973-09-28 1976-03-02 Asahi Kasei Kogyo Kabushiki Kaisha Microwave cooking apparatus
US4190757A (en) * 1976-10-08 1980-02-26 The Pillsbury Company Microwave heating package and method
US4140887A (en) * 1977-05-09 1979-02-20 Special Metals Corporation Method for microwave heating
US4210674A (en) * 1978-12-20 1980-07-01 American Can Company Automatically ventable sealed food package for use in microwave ovens
US4306133A (en) * 1979-02-14 1981-12-15 Levinson Melvin L Microwave pie baking
US4272663A (en) * 1979-08-10 1981-06-09 Green Robert E Method and apparatus for cooking
US4404241A (en) * 1979-12-19 1983-09-13 James River-Dixie/Northern, Inc. Microwave package with vent
US4303455A (en) * 1980-03-14 1981-12-01 Rockwell International Corporation Low temperature microwave annealing of semiconductor devices
US4471195A (en) * 1980-08-07 1984-09-11 Tokyo Shibaura Denki Kabushiki Kaisha Food receptacle for microwave ovens
US4529855A (en) * 1982-04-12 1985-07-16 Henry Fleck Microwave radiation detector
US4701585A (en) * 1986-04-04 1987-10-20 Kidde Consumer Durables Corp. Microwave browning cookware
US4705927A (en) * 1986-08-14 1987-11-10 Aluminum Company Of America Cooking utensil for combined microwave and steam cooking
US4891482A (en) * 1988-07-13 1990-01-02 The Stouffer Corporation Disposable microwave heating receptacle and method of using same
US5079398A (en) * 1989-11-27 1992-01-07 Pre Finish Metals Incorporated Container with ferrite coating and method of making ferrite-coated sheet
US5139826A (en) * 1989-11-27 1992-08-18 Pre Finish Metals, Incorporated Container with ferrite coating and method of making ferrite-coated sheet
US5229563A (en) * 1990-01-11 1993-07-20 Matsushita Electric Industrial Co., Ltd. Pressure cooker
US5144107A (en) * 1990-04-11 1992-09-01 The Stouffer Corporation Microwave susceptor sheet stock with heat control
US5254822A (en) * 1990-08-10 1993-10-19 Naraseiki Kabushiki Kaisha Electronic combustion furnace
US5202541A (en) * 1991-01-28 1993-04-13 Alcan International Limited Microwave heating of workpieces
US5296666A (en) * 1992-05-04 1994-03-22 The Pennsylvania Research Corporation Microwave heating apparatus having two cavities and method of using the same
US5519196A (en) * 1995-06-01 1996-05-21 Xu; Liming Material for converting microwave energy into thermal energy, and a cooking receptacle fabricated from that material
US5593610A (en) * 1995-08-04 1997-01-14 Hormel Foods Corporation Container for active microwave heating
WO2003063663A1 (en) * 2002-01-31 2003-08-07 Matsushita Electric Industrial Co., Ltd. Cooker for high-frequency heating apparatus
US20040217114A1 (en) * 2002-01-31 2004-11-04 Mamoru Isogai Cooker for high-frequency heating apparatus
US7138616B2 (en) 2002-01-31 2006-11-21 Matsushita Electric Industrial Co., Ltd. Cooker for high-frequency heating apparatus
US7223087B2 (en) 2002-05-29 2007-05-29 Razmik Akopyan Microwave molding of polymers
US20040222554A1 (en) * 2002-05-29 2004-11-11 Akopyan Razmik L. Microwave molding of polymers
US20050184434A1 (en) * 2002-05-29 2005-08-25 Razmik Akopyan Injection molding of polymers by microwave heating
US6984352B1 (en) 2002-05-29 2006-01-10 Akopyan Razmik L Dielectric mold for uniform heating and molding of polymers and composites in microwave ovens
US7122146B2 (en) 2002-05-29 2006-10-17 Akopyan Razmik L Injection molding of polymers by microwave heating
US20060237451A1 (en) * 2002-07-26 2006-10-26 Sameuls Michael R Ovenware for microwave oven
US20110168156A1 (en) * 2004-06-30 2011-07-14 Philippe Clement Microwave Ignition Method and Device For Cooking Appliances Using Solid Fuel
US20090121798A1 (en) * 2007-08-10 2009-05-14 Melvin Leroy Levinson High power microwave waste management
US20100077615A1 (en) * 2008-09-26 2010-04-01 Foxconn Technology Co., Ltd. Method for manufacturing a plate-type heat pipe
US8980984B2 (en) 2009-07-24 2015-03-17 Ticona Llc Thermally conductive polymer compositions and articles made therefrom
US9090751B2 (en) 2009-07-24 2015-07-28 Ticona Llc Thermally conductive thermoplastic resin compositions and related applications
US10791871B2 (en) 2014-03-17 2020-10-06 Jong Peter Park Travel mug for microwave oven
US20210274608A1 (en) * 2018-07-03 2021-09-02 Andrew Clive Wright Cooking Device
US10800591B1 (en) 2019-12-23 2020-10-13 Thister Inc. Beverage preparation composition and package

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