US20110139795A1 - Insulated Cooking Vessel - Google Patents
Insulated Cooking Vessel Download PDFInfo
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- US20110139795A1 US20110139795A1 US13/032,237 US201113032237A US2011139795A1 US 20110139795 A1 US20110139795 A1 US 20110139795A1 US 201113032237 A US201113032237 A US 201113032237A US 2011139795 A1 US2011139795 A1 US 2011139795A1
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- Prior art keywords
- wall
- vessel
- exterior
- cooking
- cooking vessel
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J41/00—Thermally-insulated vessels, e.g. flasks, jugs, jars
- A47J41/0055—Constructional details of the elements forming the thermal insulation
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/002—Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J41/00—Thermally-insulated vessels, e.g. flasks, jugs, jars
- A47J41/0055—Constructional details of the elements forming the thermal insulation
- A47J41/0072—Double walled vessels comprising a single insulating layer between inner and outer walls
- A47J41/0077—Double walled vessels comprising a single insulating layer between inner and outer walls made of two vessels inserted in each other
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
Definitions
- the present invention relates to an improved article of cookware, and in particular a cooking vessel having hollow sidewalls for insulation.
- Prior methods of forming a cooking vessels having hollow walls for insulation involves a separate forming and bonding of two cookware vessels.
- Prior forms of hollow wall cooking vessels have inferior cooking performance to the extent that the most of the heating of the foodstuffs is that the bottom of the cookware vessel, as the sidewalls are not intended to conduct heat, but rather provide insulation.
- the first object is achieved by providing a dual wall cooking vessel having a sealed insulating gap between the interior and exterior wall wherein the interior wall is a laminated structure with a substantially thermally conductive laminated layer facing the sealed insulating gap.
- a second aspect of the invention is characterized in that the hollow wall cooking vessel is formed by first drawing a high walled vessel from one or more planar sheet of metals, and then reversed rolling the central portion of the bottom of the high walled vessel wherein the upper portion of the wall in the initial vessel becomes the exterior wall of the dual walled vessel and the lower portion of the high wall becomes the interior wall of the dual walled vessel.
- FIG. 1 is a cross-sectional elevation of a first embodiment of the invention.
- FIG. 2A-G are a sequence of cross-sectional elevations showing a method of forming one embodiment of the invention.
- FIG. 3A is a perspective view of a cooking vessel according to another embodiment of the invention inverted to show the exterior bottom cooking surface.
- FIG. 3B is an upright cross-sectional elevation to the vessel shown in FIG. 3A .
- FIG. 3C is an expanded view of the bottom corner of the cooking vessel shown in FIG. 3B
- FIG. 3D is an expanded view of the rim portion of the cooking vessel shown in FIG. 3B .
- FIG. 4A is a perspective view of a cooking vessel according to another embodiment of the invention inverted to show the exterior bottom cooking surface.
- FIG. 4B is an upright cross-sectional elevation to the vessel shown in FIG. 4A .
- FIG. 4C is an expanded view of the bottom corner of the cooking vessel shown in FIG. 4B
- FIG. 4D is an expanded view of the rim portion of the cooking vessel shown in FIG. 4B .
- FIG. 5A-D are a sequence of cross-sectional elevations showing an alternative method of forming an embodiment of the invention.
- FIG. 6 is a cross-sectional elevation of another alternative embodiment of the invention.
- FIGS. 1 through 6 wherein like reference numerals refer to like components in the various views, there is illustrated therein a new and improved insulated cooking vessel, generally denominated 100 herein.
- FIG. 1 illustrates a first embodiment wherein a dual wall cooking vessel 100 comprises an inner shell 110 and outer shell 120 .
- Each of the inner 110 and outer shell 120 include a substantially horizontal bottom cooking surface 102 and substantially upright and surrounding vertical walls formed by the walls of the inner and outer shells 110 and 120 terminating at rim 130 .
- the diameter of the outer shell 120 is larger than the inner shell 110 such that an insulating gap 150 is formed there between.
- the inner and outer shells are preferably, but not exclusively, formed from a unitary sheet of metal, they can be considered to be integrally joined at rim 130 .
- the bottom of the inner shell 110 and the outer shell 120 are joined to form a unitary bottom portion of the cooking vessel 105 .
- the inner shell 110 has a laminated construction wherein the inner cooking surface 111 is a first material, preferably stainless steel, and the surrounding laminated structure 108 is a more thermally conductive material, such as copper or aluminum, or alloys and combinations thereof.
- the more thermally conductive material 108 lines both the bottom and sidewalls of the cooking vessel 100 , the entire inner cooking surface 111 , that is the interior bottom and interior sidewalls, are uniformly heated, as the heat is efficiently transferred through the bottom portion and sides via the thermally conductive material 108 .
- the foodstuff cooked or heated within the cookware vessel 100 and will reach a uniform temperature faster than if the thermally conductive material did not line the inner shell 110 .
- the insulating gap 150 minimizes the heat transfer away from the food after cooking is complete. Further, as the more thermally conductive material 108 faces this gap, but does not continue along the exterior sidewall of shell 120 , or make any direct contact therewith, it does not contribute to heat loss after cooking is complete.
- the cooking vessel 100 has the advantage of heating or cooking foods uniformly, but also maintaining a uniform temperature within after cooking so that the foods stays hot during serving from the same cooking vessel 100 .
- FIG. 2 illustrates another embodiment of the invention showing a sequence of process steps that may be used to form an article of cookware shown in FIG. 1 , or in the alternative embodiments of FIGS. 3-5 .
- the first step in a process of forming the cooking vessel 100 at least one substantially planar sheet of metal is deep drawn to form a fluid containing pre-form vessel 50 , shown in FIG. 2A .
- a deep drawing process is applied to a pair of stacked planar metal sheets or discs, with the smaller diameter sheet sized to form the more thermally conductive lining 108 and the larger diameter sheet intended to form both the inner shell 110 and walls 220 of the outer 120 shell and their integrally connected rim 130 .
- the inner and outer discs can be bonded by rolling, laminating or braising as well as bonded during the deep drawing process.
- the initial drawing step results in the high walled pre-form vessel 50 having diameter D and wall height H 1 , shown in FIG. 2A .
- the pre-form vessel 50 is shown inverted, that is with rim pointing downward and bottom 59 pointing upward.
- a reverse drawing process deforms the bottom portion 59 inward, which is downward in the illustration, such that the bottom 59 and a portion of the surrounding walls 51 are inverted to form the work piece 50 ′, which has the nascent interior cooking surface 111 and inner walls 210 of shell 110 as well as the outer wall 220 of outer shell 120 .
- the rim 130 integrally connects to the inner shell 110 to the outer wall 220 of outer shell 120 .
- This inverted drawing process provides an open gap 150 ′ between the inner upright walls 210 and outer wall 220 .
- the drawing die used to form the inner walls 210 has a smaller diameter than the pre-form vessel 50 formed in the first step in the drawing process.
- the work piece 50 ′ shown in FIG. 2B , has an outer diameter D, that is substantially the same as vessel 100 , with an inner diameter d between the inner wall 210 .
- the wall height of work piece 50 ′ is now reduced to H 2 , which is less than about half the initial wall height of the preform vessel 50 in FIG. 2A .
- a gap 150 ′ between the inner wall 210 and outer wall 220 which are substantially parallel to each other.
- a completed dual wall vessel 100 from the work piece 50 ′, as shown in FIG. 2G .
- This can be accomplished by “necking’ or drawing inward, as shown by arrows 20 , what is now the circumferential lower portion 217 of the outer wall 220 to the exterior bottom surface 219 , bonding these portions together at seam 218 to seal the cavity 150 associated with gap 150 ′.
- This step of bonding may be performed by braising or welding and the like.
- FIG. 2C-2F more preferred methods are shown in which a first bottom plate or dish 201 , is optionally spot welded or otherwise attached to the exterior bottom surface 219 of the work piece 50 ′ forming work-piece 50 ′′.
- a first bottom plate or dish 201 is optionally spot welded or otherwise attached to the exterior bottom surface 219 of the work piece 50 ′ forming work-piece 50 ′′.
- the lower portions 217 of the outer wall 220 are “necked” or deformed inward as indicated by reference arrow 20 along the entire perimeter of the work piece 50 ′′ overlapping the perimeter of the first bottom plate 201 .
- plate or dish 201 preferably has an outward concavity matching the exterior bottom disk 219 , rather than being a flat plate.
- a second bottom disk or plate 202 such as another aluminum plate, is attached in concentric alignment with the first bottom dish 201 at the bottom of the work piece 50 ′′ to form work piece 50 ′′.
- a presently preferred method of initial attachment is spot welding, followed by impact bonding.
- the second bottom disk 202 in this more preferred embodiments has a diameter sufficient to surround the necked in lower portion 217 of the outer wall 220 for eventual bonding thereto.
- the lower portion 217 of outer wall 220 can necked in and subsequently bonded at seam 518 to the first bottom dish 201 to seal the cavity 150 to completes another embodiment of a cooking vessel 100 .
- This step of bonding may be performed by braising or welding and the like.
- impact bonding is also the preferred means to join the second disk or dish 202 in the step shown in FIG. 2E when the first bottom disk 102 is relatively ductile aluminum disc.
- Impact bonding locks the lower portion 217 outer wall 220 between first 210 and second 202 bottom discs or plates, integral bottom portion 105 of the cooking vessel 100 , as shown in FIG. 2F , sealing the cavity 150 between the parallel sidewalls formed in the step shown in FIG. 2B .
- the bottom portions of the inner 110 and outer 120 shells are optionally joined together by other means such as brazing or welding to each other or a third intermediate structure.
- first disc 201 can be a shallow concave dish with sidewalls that extend the desired height to fill the lower portion 251 of gap 150 .
- Either method provides a thick interlayer of a thermally conductive material to fill the bottom portion 251 of the gap 150 between the inner and outer vessel at the margin between bottom cooking surface and surrounding sidewalls. Fillings a lower portion of the sidewalls between the inner 110 and outer shell 120 in the above, or any other manner, provides sufficient thermal mass to avoid damage or discoloration from the heating element or flame. It should be appreciated that although impact bonding provides this significant benefit when the first bottom disk 201 is aluminum, impact bonding need not be the exclusive means adjoining a first bottom disk of aluminum, or any other material, with a second bottom disk of an other material.
- the cooking vessel of FIG. 2G is shown schematically in FIG. 6 to emphasize the preferred structure of the integral bottom 105 .
- FIG. 3A illustrates a dual wall cooking vessel having the more thermally conductive material 108 form the exterior bottom of the cooking vessel 102 , as might be desirable when this more thermally conductive material is copper.
- This structure can be achieved in the previously described alternative methods wherein the first and second bottom disks are not required to seal the inner gap 150 , as shown by FIG. 2G .
- copper disks, or any combination of the copper disk with another material could alternatively be brazed together to create a thicker bottom portion of cooking vessel 100 .
- FIG. 3C showing the junction between the interior cooking surface 111 and the inner shell 110 wall that extends upward, the exterior cladding 108 of the inner shell 100 extends across the exterior bottom cooking surface being either a portion of the sidewall that was drawn inward, as shown in FIG. 2F , or alternatively attached after a separate drawing process.
- FIG. 3D illustrates in more detail the rim portion 130 of the cooking vessel 100 above gap 150 . It can also be seen in this embodiment that the outer cladding 108 of the inner shell 110 does not extend upward to reach the interior top of the cavity 150 to the rim 130 , but rather terminates just below the rim 130 . This facilitates the double drawing operation illustrated with respect to FIG. 2 B.
- the rim 130 remains cooler during cooking. This facilitates handling, but also prevents further heat, as would occur after cooking through the more thermally conductive outer cladding 108 if it extended to outer shell 120 .
- the stainless steel that forms the inner and outer shells 110 and 120 preferably has a thickness of about 0.5 mm.
- the copper that forms the thermally conductive outer cladding 108 preferably has a thickness of about 1.0 to 1.2 mm.
- FIG. 4 A illustrates another dual wall cooking vessel wherein the exterior bottom cooking surface 102 is a different material than the thermally conductive material used to line the outer portion of the inner shell.
- bottom plate 103 is below the outer cladding 108 that surrounds the inner shell 110 .
- One means of providing a ferromagnetic material in the exterior bottom cooking surface is by lamination as shown in FIG. 2 F.
- the ferromagnetic material can be attached to the exterior bottom cooking surface of the vessel shown in FIG. 3A by a subsequent step of either impact bonding, brazing or embedding a discontinuous layer of ferromagnetic material such as a mesh or grid.
- FIG. 5A-D illustrates an alternative method of forming the cookware vessel 100 .
- a substantially round or oval blank of clad metal sheet 510 has an upper layer 505 and a lower layer 508 . At least a portion of layer 508 is intended to form the more thermally conductive layer 108 that clads or is laminated to the inner shell 110 .
- Layer 505 is preferably stainless steel of about 0.5 to 0.6 mm thick, whereas layer 508 is preferably at least one of aluminum and copper that is about 0.8 to 2 mm thick.
- partially clad sheet 510 ′ has a upper sheet 505 ′ and a narrower lower layer 508 ′.
- the lower layer 508 ′ has been narrowed by machining away material from layer 508 of sheet 510 .
- the clad sheet combination 510 ′ can be formed by bonding two disks of different diameters together, such as by explosive or impact bonding, as well as by repeated rolling operations or brazing.
- sheet 510 ′ has been deformed by deep drawing to form the inner shell 513 , having a bottom 503 , surrounding sidewall 503 terminating at an outward flared rim 530 .
- An outer vessel or shell 520 having a bottom 523 and surrounding sidewall 522 , is then joined to the inner shell 520 , by sealing its rim 533 to flared rim 530 , forming wall cavity 150 in vessel 100 .
- another metal plate or disc 583 is bonded between the inner shell 513 and outer shell 520 by impact bonding prior to the attachment of rims 530 and 533 , forming vessel 100 in FIG. 5D .
- bottom disks 201 and 202 are optionally any combination of thermally conductive material such as copper and aluminum, and may also comprise either a layer or mesh of a ferromagnetic material for induction cooking.
Abstract
A dual wall cooking vessel has an inner cooking portion or shell with a thermally conductive outer cladding that terminates prior to the interior of the rim of the cooking vessel. The construction provides uniform temperature during the cooking process, yet minimizes heat loss after cooking.
Description
- The present application is a Division of and claims the benefit of priority to the US Non-provisional patent application having Ser. No. 11/953,153, which was filed on 10 Dec. 2007 under the title “Insulated Cooking Vessel”, which in turn claims the benefit of priority to the US provisional patent application having Ser. No. 60/871,357, which was filed on 21 Dec. 2006 under the title “Insulated Cooking Vessel”, both of which are incorporated herein by reference.
- The present invention relates to an improved article of cookware, and in particular a cooking vessel having hollow sidewalls for insulation.
- Prior methods of forming a cooking vessels having hollow walls for insulation involves a separate forming and bonding of two cookware vessels.
- Prior forms of hollow wall cooking vessels have inferior cooking performance to the extent that the most of the heating of the foodstuffs is that the bottom of the cookware vessel, as the sidewalls are not intended to conduct heat, but rather provide insulation.
- It is therefore a first object of the present invention to provide improved hollow wall cooking vessels wherein the cooking performance is not compromised by the insulating qualities, and the insulating qualities are not compromised by the cooking performance.
- It is a further objective of the present invention to provide a method for forming such a cookware article.
- It is still yet another object of the present invention to provide a method of forming a cookware article having attributes of the other objectives wherein the process of welding is not required to seal the hollow wall. A still further objective of the present invention is to provide a method of forming a cookware article having the attributes of the other objectives wherein there is provided in the lower portion of the sidewalls between the inner and outer vessel a sufficient mass of thermally conductive material to avoid damage or discoloration from the heating element or flame.
- In the present invention, the first object is achieved by providing a dual wall cooking vessel having a sealed insulating gap between the interior and exterior wall wherein the interior wall is a laminated structure with a substantially thermally conductive laminated layer facing the sealed insulating gap.
- A second aspect of the invention is characterized in that the hollow wall cooking vessel is formed by first drawing a high walled vessel from one or more planar sheet of metals, and then reversed rolling the central portion of the bottom of the high walled vessel wherein the upper portion of the wall in the initial vessel becomes the exterior wall of the dual walled vessel and the lower portion of the high wall becomes the interior wall of the dual walled vessel.
- The above and other objects, effects, features, and advantages of the present invention will become more apparent from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.
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FIG. 1 is a cross-sectional elevation of a first embodiment of the invention. -
FIG. 2A-G are a sequence of cross-sectional elevations showing a method of forming one embodiment of the invention. -
FIG. 3A is a perspective view of a cooking vessel according to another embodiment of the invention inverted to show the exterior bottom cooking surface.FIG. 3B is an upright cross-sectional elevation to the vessel shown inFIG. 3A .FIG. 3C . is an expanded view of the bottom corner of the cooking vessel shown inFIG. 3B , whereasFIG. 3D is an expanded view of the rim portion of the cooking vessel shown inFIG. 3B . -
FIG. 4A is a perspective view of a cooking vessel according to another embodiment of the invention inverted to show the exterior bottom cooking surface.FIG. 4B is an upright cross-sectional elevation to the vessel shown inFIG. 4A .FIG. 4C . is an expanded view of the bottom corner of the cooking vessel shown inFIG. 4B , whereasFIG. 4D is an expanded view of the rim portion of the cooking vessel shown inFIG. 4B . -
FIG. 5A-D are a sequence of cross-sectional elevations showing an alternative method of forming an embodiment of the invention. -
FIG. 6 is a cross-sectional elevation of another alternative embodiment of the invention. - Referring to
FIGS. 1 through 6 , wherein like reference numerals refer to like components in the various views, there is illustrated therein a new and improved insulated cooking vessel, generally denominated 100 herein. - In accordance with the present invention,
FIG. 1 illustrates a first embodiment wherein a dualwall cooking vessel 100 comprises aninner shell 110 andouter shell 120. Each of the inner 110 andouter shell 120 include a substantially horizontalbottom cooking surface 102 and substantially upright and surrounding vertical walls formed by the walls of the inner andouter shells rim 130. The diameter of theouter shell 120 is larger than theinner shell 110 such that aninsulating gap 150 is formed there between. As the inner and outer shells are preferably, but not exclusively, formed from a unitary sheet of metal, they can be considered to be integrally joined atrim 130. The bottom of theinner shell 110 and theouter shell 120 are joined to form a unitary bottom portion of thecooking vessel 105. In a most preferred embodiment, theinner shell 110 has a laminated construction wherein theinner cooking surface 111 is a first material, preferably stainless steel, and the surrounding laminatedstructure 108 is a more thermally conductive material, such as copper or aluminum, or alloys and combinations thereof. As the more thermallyconductive material 108 lines both the bottom and sidewalls of thecooking vessel 100, the entireinner cooking surface 111, that is the interior bottom and interior sidewalls, are uniformly heated, as the heat is efficiently transferred through the bottom portion and sides via the thermallyconductive material 108. Thus, the foodstuff cooked or heated within thecookware vessel 100 and will reach a uniform temperature faster than if the thermally conductive material did not line theinner shell 110. However theinsulating gap 150 minimizes the heat transfer away from the food after cooking is complete. Further, as the more thermallyconductive material 108 faces this gap, but does not continue along the exterior sidewall ofshell 120, or make any direct contact therewith, it does not contribute to heat loss after cooking is complete. Thus, thecooking vessel 100 has the advantage of heating or cooking foods uniformly, but also maintaining a uniform temperature within after cooking so that the foods stays hot during serving from thesame cooking vessel 100. -
FIG. 2 illustrates another embodiment of the invention showing a sequence of process steps that may be used to form an article of cookware shown inFIG. 1 , or in the alternative embodiments ofFIGS. 3-5 . - Generally, the first step in a process of forming the
cooking vessel 100 at least one substantially planar sheet of metal is deep drawn to form a fluid containingpre-form vessel 50, shown inFIG. 2A . In this preferred method of creating the more thermally conductive outer layer 108 a deep drawing process is applied to a pair of stacked planar metal sheets or discs, with the smaller diameter sheet sized to form the more thermallyconductive lining 108 and the larger diameter sheet intended to form both theinner shell 110 andwalls 220 of the outer 120 shell and their integrally connectedrim 130. The inner and outer discs can be bonded by rolling, laminating or braising as well as bonded during the deep drawing process. The initial drawing step results in the high walled pre-formvessel 50 having diameter D and wall height H1, shown inFIG. 2A . Thepre-form vessel 50 is shown inverted, that is with rim pointing downward andbottom 59 pointing upward. - Following the creation of
pre-form vessel 50, a reverse drawing process deforms thebottom portion 59 inward, which is downward in the illustration, such that thebottom 59 and a portion of the surroundingwalls 51 are inverted to form thework piece 50′, which has the nascentinterior cooking surface 111 andinner walls 210 ofshell 110 as well as theouter wall 220 ofouter shell 120. Therim 130 integrally connects to theinner shell 110 to theouter wall 220 ofouter shell 120. This inverted drawing process provides anopen gap 150′ between the innerupright walls 210 andouter wall 220. - It should be noted that the drawing die used to form the
inner walls 210 has a smaller diameter than thepre-form vessel 50 formed in the first step in the drawing process. Thus, thework piece 50′, shown inFIG. 2B , has an outer diameter D, that is substantially the same asvessel 100, with an inner diameter d between theinner wall 210. Further, the wall height ofwork piece 50′ is now reduced to H2, which is less than about half the initial wall height of thepreform vessel 50 inFIG. 2A . It should be noted there is now agap 150′ between theinner wall 210 andouter wall 220, which are substantially parallel to each other. - In one alternative embodiment it is possible to form a completed
dual wall vessel 100 from thework piece 50′, as shown inFIG. 2G . This can be accomplished by “necking’ or drawing inward, as shown byarrows 20, what is now the circumferentiallower portion 217 of theouter wall 220 to theexterior bottom surface 219, bonding these portions together atseam 218 to seal thecavity 150 associated withgap 150′. This step of bonding may be performed by braising or welding and the like. - However, more preferred methods are shown in
FIG. 2C-2F in which a first bottom plate ordish 201, is optionally spot welded or otherwise attached to theexterior bottom surface 219 of thework piece 50′ forming work-piece 50″. Next, as shown inFIG. 2D , thelower portions 217 of theouter wall 220 are “necked” or deformed inward as indicated byreference arrow 20 along the entire perimeter of thework piece 50″ overlapping the perimeter of thefirst bottom plate 201. - It should be noted that plate or
dish 201 preferably has an outward concavity matching the exteriorbottom disk 219, rather than being a flat plate. In the next step, as shown inFIG. 2E , a second bottom disk orplate 202, such as another aluminum plate, is attached in concentric alignment with the firstbottom dish 201 at the bottom of thework piece 50″ to formwork piece 50″. A presently preferred method of initial attachment is spot welding, followed by impact bonding. It should be appreciated that the secondbottom disk 202 in this more preferred embodiments has a diameter sufficient to surround the necked inlower portion 217 of theouter wall 220 for eventual bonding thereto. - Optionally, as shown in
FIG. 2H , thelower portion 217 ofouter wall 220 can necked in and subsequently bonded at seam 518 to the firstbottom dish 201 to seal thecavity 150 to completes another embodiment of acooking vessel 100. This step of bonding may be performed by braising or welding and the like. - It should also be appreciated that impact bonding is also the preferred means to join the second disk or
dish 202 in the step shown inFIG. 2E when the firstbottom disk 102 is relatively ductile aluminum disc. Impact bonding locks thelower portion 217outer wall 220 between first 210 and second 202 bottom discs or plates,integral bottom portion 105 of thecooking vessel 100, as shown inFIG. 2F , sealing thecavity 150 between the parallel sidewalls formed in the step shown inFIG. 2B . It is further preferable in this step to heat at least the bottom portion ofpreform 50′″ to a high temperature to assure sufficient plasticity of the aluminum so that it will flow between theinner shell 110 and theouter shell 120 and partially moving upward ingap 150. However it should be appreciated that the bottom portions of the inner 110 and outer 120 shells are optionally joined together by other means such as brazing or welding to each other or a third intermediate structure. - Alternatively,
first disc 201 can be a shallow concave dish with sidewalls that extend the desired height to fill thelower portion 251 ofgap 150. Either method provides a thick interlayer of a thermally conductive material to fill thebottom portion 251 of thegap 150 between the inner and outer vessel at the margin between bottom cooking surface and surrounding sidewalls. Fillings a lower portion of the sidewalls between the inner 110 andouter shell 120 in the above, or any other manner, provides sufficient thermal mass to avoid damage or discoloration from the heating element or flame. It should be appreciated that although impact bonding provides this significant benefit when the firstbottom disk 201 is aluminum, impact bonding need not be the exclusive means adjoining a first bottom disk of aluminum, or any other material, with a second bottom disk of an other material. The cooking vessel ofFIG. 2G is shown schematically inFIG. 6 to emphasize the preferred structure of theintegral bottom 105. -
FIG. 3A illustrates a dual wall cooking vessel having the more thermallyconductive material 108 form the exterior bottom of thecooking vessel 102, as might be desirable when this more thermally conductive material is copper. This structure can be achieved in the previously described alternative methods wherein the first and second bottom disks are not required to seal theinner gap 150, as shown byFIG. 2G . Alternatively, copper disks, or any combination of the copper disk with another material, could alternatively be brazed together to create a thicker bottom portion ofcooking vessel 100. - As will be evident from
FIG. 3C , showing the junction between theinterior cooking surface 111 and theinner shell 110 wall that extends upward, theexterior cladding 108 of theinner shell 100 extends across the exterior bottom cooking surface being either a portion of the sidewall that was drawn inward, as shown inFIG. 2F , or alternatively attached after a separate drawing process.FIG. 3D illustrates in more detail therim portion 130 of thecooking vessel 100 abovegap 150. It can also be seen in this embodiment that theouter cladding 108 of theinner shell 110 does not extend upward to reach the interior top of thecavity 150 to therim 130, but rather terminates just below therim 130. This facilitates the double drawing operation illustrated with respect toFIG. 2 B. Further, by terminating theouter cladding 108 of theinner shell 110 just below therim 130, therim 130 remains cooler during cooking. This facilitates handling, but also prevents further heat, as would occur after cooking through the more thermally conductiveouter cladding 108 if it extended toouter shell 120. In this embodiment the stainless steel that forms the inner andouter shells outer cladding 108 preferably has a thickness of about 1.0 to 1.2 mm. -
FIG. 4 A illustrates another dual wall cooking vessel wherein the exteriorbottom cooking surface 102 is a different material than the thermally conductive material used to line the outer portion of the inner shell. Thus, inFIG. 4C ,bottom plate 103 is below theouter cladding 108 that surrounds theinner shell 110. For example, it would be desirable in some instances to provide an exteriorbottom cooking surface 103 wherein theunitary bottom portion 105 containing at least one ferromagnetic material, such asbottom plate 103 so that cookingvessel 100 can be used on an induction stove. One means of providing a ferromagnetic material in the exterior bottom cooking surface is by lamination as shown inFIG. 2 F. Alternatively, the ferromagnetic material can be attached to the exterior bottom cooking surface of the vessel shown inFIG. 3A by a subsequent step of either impact bonding, brazing or embedding a discontinuous layer of ferromagnetic material such as a mesh or grid. -
FIG. 5A-D illustrates an alternative method of forming thecookware vessel 100. InFIG. 5A a substantially round or oval blank ofclad metal sheet 510 has anupper layer 505 and alower layer 508. At least a portion oflayer 508 is intended to form the more thermallyconductive layer 108 that clads or is laminated to theinner shell 110.Layer 505 is preferably stainless steel of about 0.5 to 0.6 mm thick, whereaslayer 508 is preferably at least one of aluminum and copper that is about 0.8 to 2 mm thick. InFIG. 5B partiallyclad sheet 510′ has aupper sheet 505′ and a narrowerlower layer 508′. Thelower layer 508′ has been narrowed by machining away material fromlayer 508 ofsheet 510. Alternatively, theclad sheet combination 510′ can be formed by bonding two disks of different diameters together, such as by explosive or impact bonding, as well as by repeated rolling operations or brazing. - Next, as shown in
FIG. 5C ,sheet 510′ has been deformed by deep drawing to form theinner shell 513, having a bottom 503, surroundingsidewall 503 terminating at an outward flaredrim 530. An outer vessel orshell 520, having a bottom 523 and surroundingsidewall 522, is then joined to theinner shell 520, by sealing itsrim 533 to flaredrim 530, formingwall cavity 150 invessel 100. - It is also preferable that another metal plate or
disc 583 is bonded between theinner shell 513 andouter shell 520 by impact bonding prior to the attachment ofrims vessel 100 inFIG. 5D . - Again it should be emphasized that the
cooking vessels 100 illustrated with respect toFIG. 1 , 3-5 need not be fabricated exclusively by the process shown inFIGS. 2 and 5 . Further, it should be appreciate thatbottom disks - While the invention has been described in connection with a preferred embodiment, it is not intended to limit the scope of the invention to the particular form set forth, but on the contrary, it is intended to cover such alternatives, modifications, and equivalents as may be within the spirit and scope of the invention as defined by the appended claims.
Claims (21)
1. A dual wall cooking vessel, the vessel comprising:
a) a vertical portion having,
i) an internal bottom cooking surface, and
ii) an exterior bottom surface,
b) a seamless substantially upright wall having,
i) an interior wall that surrounds and is connected at the bottom thereof to the internal bottom cooking surface, wherein the internal bottom cooking surface and the interior wall provide an inner vessel capable of containing fluid having a rim, and
ii) an exterior wall that is a substantially downward continuation from the top of the interior wall wherein the interior and exterior walls meet at the rim, in which the exterior wall terminates by connecting to the exterior bottom surface of the vertical portion, wherein the exterior wall is spaced apart from the interior wall to form an annular cavity there between,
c) wherein the inner vessel has a laminated construction wherein an inner surface is a first material and an outer surface is a more thermally conductive material than the first material, the more thermally conductive material surrounding at least the interior wall vertical walls and terminating below the rim so as to face the cavity formed between the interior wall and the exterior wall.
2. A dual wall cooking vessel according to claim 1 wherein the first material is stainless steel and the more thermally conductive material comprises one or more layer of at least one of copper and aluminum.
3. A dual wall cooking vessel according to claim 1 further comprising a first metal cap as the exterior bottom surface wherein the bottom of the exterior wall is bonded to the first metal cap.
4. A dual wall cooking vessel according to claim 3 further comprising a second metal cap that is bonded to the first metal cap wherein the bottom of the outer vessel wall is bonded between the first and second metal caps such that the second metal cap provides the exterior bottom surface.
5. A dual wall cooking vessel according to claim 4 wherein at least one of the first and second metal caps consists essentially of a metal selected from the group consisting of copper and aluminum.
6. A dual wall cooking vessel according to claim 4 wherein the second metal cap is a ferromagnetic material.
7. A dual wall cooking vessel according to claim 1 the more thermally conductive material surrounds the interior wall and the internal bottom cooking surface.
8. A dual wall cooking vessel according to claim 1 wherein the vertical portion has 2 or more layers and the bottom of the interior wall is bonded between said two of more layers.
9. A dual wall cooking vessel according to claim 2 further wherein the exterior bottom surface is bonded between the first metal cap and the portion of at least one of the vertical portion and seamless upright wall in a portion in the vicinity of connection of the vertical portion to the seamless upright wall that is external to the inner vessel.
10. A dual wall cooking vessel, the vessel comprising:
a) an inner vessel having a bottom portion surrounded by vertical walls terminating at an inner rim to form an inner surface for containing fluids,
b) an outer vessel having a bottom portion surrounded by vertical walls terminating at an outer rim to form an inner surface capable of containing fluids and surrounding the inner vessel,
c) wherein the inner vessels is nested within the outer vessel such that the inner rim and the outer rim are concentrically aligned with each other, and
d) wherein a cavity is formed between the inner surface of the outer vessel and the outer surface of the inner vessel by coupling the bottom of the outer vessel wall to the exterior bottom of the inner vessel,
e) wherein the inner and outer rims are formed of the same continuous sheet of material that forms the outer vessel and the interior of the inner vessel.
11. A dual wall cooking vessel according to claim 10 further comprising a first metal cap that is bonded to the exterior bottom of the inner vessel wherein the bottom of the outer vessel wall is bonded to the first metal cap.
12. A dual wall cooking vessel according to claim 11 further comprising a second metal cap that is bonded to the first metal wherein the bottom of the outer vessel wall is bonded between the first and second metal caps.
13. A dual wall cooking vessel according to claim 12 wherein at least one of the first and second metal caps is selected from the group consisting of copper and aluminum.
14. A dual wall cooking vessel according to claim 11 wherein the second metal cap is a ferromagnetic material.
15. A dual wall cooking vessel according to claim 10 wherein at least the interior wall has a clad construction and the outer vessel is a unitary wall of a single metal layer.
16. A dual wall cooking vessel according to claim 10 wherein the vertical portion has 2 or more layers and the bottom of the interior wall is bonded between said two of more layers.
17. A dual wall cooking vessel according to claim 10 wherein at least one of said two or more layers is a ferromagnetic material.
18. A dual wall cooking vessel, the vessel comprising:
a) a vertical portion having,
i) an internal bottom cooking surface,
ii) an exterior bottom surface,
b) a seamless substantially upright wall having,
i) an interior wall that surrounds and is connected at the bottom thereof to the internal bottom cooking surface, wherein the internal bottom cooking surface and the interior wall provide an inner vessel capable of containing fluid having a rim,
ii) an exterior wall that is a substantially downward continuation from the top of the interior wall wherein the interior and exterior walls meet at the rim, in which the exterior wall terminates by connecting to the exterior bottom surface of the vertical portion, wherein the exterior wall is spaced apart from the interior wall to form an annular cavity there between,
c) wherein the vertical portion has 2 or more layers and the bottom of the interior wall is bonded between said two of more layers.
19. A dual wall cooking vessel according to claim 18 further comprising a metal cap that forms the exterior bottom surface.
20. A dual wall cooking vessel according to claim 19 wherein at least one of 2 or more layers consists essentially of a metal selected from the group consisting of copper and aluminum.
21. A dual wall cooking vessel according to claim 19 wherein the metal cap is a ferromagnetic material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/032,237 US20110139795A1 (en) | 2006-12-21 | 2011-02-22 | Insulated Cooking Vessel |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US87135706P | 2006-12-21 | 2006-12-21 | |
US11/953,153 US7913372B2 (en) | 2006-12-21 | 2007-12-10 | Insulated cooking vessel |
US13/032,237 US20110139795A1 (en) | 2006-12-21 | 2011-02-22 | Insulated Cooking Vessel |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/953,153 Division US7913372B2 (en) | 2006-12-21 | 2007-12-10 | Insulated cooking vessel |
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Publication Number | Publication Date |
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US20110139795A1 true US20110139795A1 (en) | 2011-06-16 |
Family
ID=39284074
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/953,153 Active 2029-06-27 US7913372B2 (en) | 2006-12-21 | 2007-12-10 | Insulated cooking vessel |
US13/032,237 Abandoned US20110139795A1 (en) | 2006-12-21 | 2011-02-22 | Insulated Cooking Vessel |
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US11/953,153 Active 2029-06-27 US7913372B2 (en) | 2006-12-21 | 2007-12-10 | Insulated cooking vessel |
Country Status (6)
Country | Link |
---|---|
US (2) | US7913372B2 (en) |
EP (2) | EP2460450B1 (en) |
JP (1) | JP5188797B2 (en) |
CN (2) | CN101305887B (en) |
CA (1) | CA2615976C (en) |
ES (1) | ES2456716T3 (en) |
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US20130056474A1 (en) * | 2011-09-04 | 2013-03-07 | Afzal Chaudhry | Energy Saver Cooking Pot |
US20130068775A1 (en) * | 2010-04-25 | 2013-03-21 | Mitsubishi Electric Corporation | Cooking utensil with a deformation-free base, and method for producing said cooking utensil |
WO2019102250A1 (en) * | 2017-11-22 | 2019-05-31 | Withanage Sisira Prasanna | An energy efficient cooking vessel |
CN114011960A (en) * | 2021-09-27 | 2022-02-08 | 深圳市信维通信股份有限公司 | Deep drawing and stamping forming process for L-shaped profile thin metal shell |
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Citations (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1093648A (en) * | 1912-06-24 | 1914-04-21 | Charles F Potter | Double-walled container. |
US1459023A (en) * | 1921-01-10 | 1923-06-19 | Guest Albert Harry | Match stand, inkstand, ash bowl, and the like article |
US1749433A (en) * | 1928-04-02 | 1930-03-04 | W E Long Co | Baking pan and method of baking |
US1927686A (en) * | 1931-08-20 | 1933-09-19 | Kapner Charles | Cooking vessel for electric ranges |
US2174425A (en) * | 1937-08-09 | 1939-09-26 | Schlumbohm Peter | Cooking utensil |
US2517584A (en) * | 1946-10-26 | 1950-08-08 | Specialties Dev Corp | Method of forming receptacles |
US2518483A (en) * | 1947-02-15 | 1950-08-15 | Specialties Dev Corp | Method of making receptacles |
US3837330A (en) * | 1973-03-28 | 1974-09-24 | American Hospital Supply Corp | Heat-retaining server |
US3934748A (en) * | 1972-04-10 | 1976-01-27 | Racz Nick S | Cookware containers |
US3979572A (en) * | 1974-10-29 | 1976-09-07 | Mitsubishi Denki Kabushiki Kaisha | Induction heating apparatus |
US4204609A (en) * | 1977-01-26 | 1980-05-27 | Heinrich Kuhn Metallwarenfabrik Aktiengesellschaft | Cooking, serving and warm-keeping arrangement |
US4595120A (en) * | 1982-09-28 | 1986-06-17 | Logan Eugene T | Insulated cooking utensil |
US4646935A (en) * | 1985-01-18 | 1987-03-03 | Clad Metals, Inc. | Induction cooking utensils |
US4653469A (en) * | 1984-08-08 | 1987-03-31 | Nippon Sanso Kabushiki Kaisha | Vacuum-heat-insulated cooking utensil and method of manufacturing same |
US4790292A (en) * | 1985-10-31 | 1988-12-13 | Heinrich Kuhn Metallwarenfabrik Ag | Cooking vessel |
US5348187A (en) * | 1989-04-26 | 1994-09-20 | Alfa Institut Fur Hauswirtschaftliche Produkt- And Verfahrens- Entwicklung Gmbh | Double-walled cooking pot |
US5532461A (en) * | 1994-04-15 | 1996-07-02 | Fissler Gmbh | Bottom-heated utensil for conductive or induction heating |
US6191393B1 (en) * | 1999-01-16 | 2001-02-20 | Jong Do Peter Park | Cooking utensil and manufacturing method therefor |
US6467645B2 (en) * | 1999-01-16 | 2002-10-22 | Jong-Do Peter Park | Cooking container and manufacturing method therefor |
US6576876B2 (en) * | 2000-11-02 | 2003-06-10 | Inoxia, S.R.L. | Stainless steel cooking utensil with composite capsular base heatable by magnetic induction |
US20050161458A1 (en) * | 2004-01-28 | 2005-07-28 | Cheng Stanley K.S. | Double wall cooking vessel |
US20050205646A1 (en) * | 2004-03-19 | 2005-09-22 | Meyer Intellectual Properties Ltd. | Titanium lined composite cookware |
US20120085243A1 (en) * | 2010-10-07 | 2012-04-12 | Jong Peter Park | Eco Green Cookware |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO147292C (en) * | 1978-09-29 | 1983-03-16 | Ardal Og Sunndal Verk | Laminated cookware, frying pan or similar and method of making the same |
JPS60151448U (en) * | 1984-03-16 | 1985-10-08 | 日東工器株式会社 | Heating/cold storage device |
JPS6348526U (en) * | 1986-09-17 | 1988-04-01 | ||
US5507220A (en) * | 1992-11-26 | 1996-04-16 | Jung; Kwang S. | Cooking utensil |
JPH0889397A (en) * | 1994-09-21 | 1996-04-09 | Toyo Tanso Kk | Pot |
CN2207137Y (en) * | 1994-10-10 | 1995-09-13 | 缪亨 | Portable energy-saving electric rice cooker |
JPH08112207A (en) | 1994-10-12 | 1996-05-07 | Toyo Tanso Kk | Frying pan |
CN2242660Y (en) * | 1995-09-25 | 1996-12-18 | 陆晓奋 | Cooker for electromagnetic range |
JPH09206201A (en) * | 1996-02-05 | 1997-08-12 | Nippon Sanso Kk | Manufacture of heat storage pan |
CH690747A5 (en) | 1996-02-12 | 2001-01-15 | Kuhn Heinrich Metall | Cooking device has vessel with heat-conducting base and heat-insulated side walls which have outer and inner walls with intermediate space |
FR2748383A3 (en) * | 1996-05-09 | 1997-11-14 | Hsiao Cary | Cooking vessel with outer and inner wall and intermediate vacuum |
JPH1118926A (en) * | 1997-07-02 | 1999-01-26 | Zojirushi Corp | Vacuum double vessel for electromagnetic induction heating cooking |
CN1421176A (en) * | 2001-08-28 | 2003-06-04 | 朴钟道 | Pan with double-layer structure |
-
2007
- 2007-12-10 US US11/953,153 patent/US7913372B2/en active Active
- 2007-12-19 EP EP11008579.2A patent/EP2460450B1/en active Active
- 2007-12-19 ES ES11008579.2T patent/ES2456716T3/en active Active
- 2007-12-19 EP EP07024595.6A patent/EP1935299B1/en active Active
- 2007-12-20 JP JP2007329324A patent/JP5188797B2/en not_active Expired - Fee Related
- 2007-12-20 CA CA2615976A patent/CA2615976C/en not_active Expired - Fee Related
- 2007-12-21 CN CN2007101997845A patent/CN101305887B/en active Active
- 2007-12-21 CN CN201010539588XA patent/CN102028397B/en active Active
-
2011
- 2011-02-22 US US13/032,237 patent/US20110139795A1/en not_active Abandoned
Patent Citations (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1093648A (en) * | 1912-06-24 | 1914-04-21 | Charles F Potter | Double-walled container. |
US1459023A (en) * | 1921-01-10 | 1923-06-19 | Guest Albert Harry | Match stand, inkstand, ash bowl, and the like article |
US1749433A (en) * | 1928-04-02 | 1930-03-04 | W E Long Co | Baking pan and method of baking |
US1927686A (en) * | 1931-08-20 | 1933-09-19 | Kapner Charles | Cooking vessel for electric ranges |
US2174425A (en) * | 1937-08-09 | 1939-09-26 | Schlumbohm Peter | Cooking utensil |
US2517584A (en) * | 1946-10-26 | 1950-08-08 | Specialties Dev Corp | Method of forming receptacles |
US2518483A (en) * | 1947-02-15 | 1950-08-15 | Specialties Dev Corp | Method of making receptacles |
US3934748A (en) * | 1972-04-10 | 1976-01-27 | Racz Nick S | Cookware containers |
US3837330A (en) * | 1973-03-28 | 1974-09-24 | American Hospital Supply Corp | Heat-retaining server |
US3979572A (en) * | 1974-10-29 | 1976-09-07 | Mitsubishi Denki Kabushiki Kaisha | Induction heating apparatus |
US4204609A (en) * | 1977-01-26 | 1980-05-27 | Heinrich Kuhn Metallwarenfabrik Aktiengesellschaft | Cooking, serving and warm-keeping arrangement |
US4595120A (en) * | 1982-09-28 | 1986-06-17 | Logan Eugene T | Insulated cooking utensil |
US4653469A (en) * | 1984-08-08 | 1987-03-31 | Nippon Sanso Kabushiki Kaisha | Vacuum-heat-insulated cooking utensil and method of manufacturing same |
US4646935A (en) * | 1985-01-18 | 1987-03-03 | Clad Metals, Inc. | Induction cooking utensils |
US4790292A (en) * | 1985-10-31 | 1988-12-13 | Heinrich Kuhn Metallwarenfabrik Ag | Cooking vessel |
US5348187A (en) * | 1989-04-26 | 1994-09-20 | Alfa Institut Fur Hauswirtschaftliche Produkt- And Verfahrens- Entwicklung Gmbh | Double-walled cooking pot |
US5532461A (en) * | 1994-04-15 | 1996-07-02 | Fissler Gmbh | Bottom-heated utensil for conductive or induction heating |
US6191393B1 (en) * | 1999-01-16 | 2001-02-20 | Jong Do Peter Park | Cooking utensil and manufacturing method therefor |
US6467645B2 (en) * | 1999-01-16 | 2002-10-22 | Jong-Do Peter Park | Cooking container and manufacturing method therefor |
US6576876B2 (en) * | 2000-11-02 | 2003-06-10 | Inoxia, S.R.L. | Stainless steel cooking utensil with composite capsular base heatable by magnetic induction |
US20050161458A1 (en) * | 2004-01-28 | 2005-07-28 | Cheng Stanley K.S. | Double wall cooking vessel |
US7097064B2 (en) * | 2004-01-28 | 2006-08-29 | Meyer Intellectual Properties Limited | Double wall cooking vessel |
US20060289487A1 (en) * | 2004-01-28 | 2006-12-28 | Meyer Intellectual Properties Limited | Double Walled Induction Heated Article of Cookware |
US7216413B2 (en) * | 2004-01-28 | 2007-05-15 | Meyer Intellectual Properties Limited | Method of forming a double wall cooking vessel |
US7378623B2 (en) * | 2004-01-28 | 2008-05-27 | Meyer Intellectual Properties Limited | Double walled induction heated article of cookware |
US20050205646A1 (en) * | 2004-03-19 | 2005-09-22 | Meyer Intellectual Properties Ltd. | Titanium lined composite cookware |
US20120085243A1 (en) * | 2010-10-07 | 2012-04-12 | Jong Peter Park | Eco Green Cookware |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130068775A1 (en) * | 2010-04-25 | 2013-03-21 | Mitsubishi Electric Corporation | Cooking utensil with a deformation-free base, and method for producing said cooking utensil |
US9242286B2 (en) * | 2010-04-25 | 2016-01-26 | Johan Laubscher | Cooking utensil with a deformation-free base, and method for producing said cooking utensil |
US20130056474A1 (en) * | 2011-09-04 | 2013-03-07 | Afzal Chaudhry | Energy Saver Cooking Pot |
WO2019102250A1 (en) * | 2017-11-22 | 2019-05-31 | Withanage Sisira Prasanna | An energy efficient cooking vessel |
CN114011960A (en) * | 2021-09-27 | 2022-02-08 | 深圳市信维通信股份有限公司 | Deep drawing and stamping forming process for L-shaped profile thin metal shell |
Also Published As
Publication number | Publication date |
---|---|
CN102028397A (en) | 2011-04-27 |
CA2615976C (en) | 2012-10-30 |
ES2456716T3 (en) | 2014-04-23 |
CN101305887A (en) | 2008-11-19 |
US20080156810A1 (en) | 2008-07-03 |
CA2615976A1 (en) | 2008-06-21 |
EP2460450B1 (en) | 2014-01-22 |
EP2460450A1 (en) | 2012-06-06 |
JP5188797B2 (en) | 2013-04-24 |
EP1935299B1 (en) | 2013-09-04 |
JP2008161678A (en) | 2008-07-17 |
CN101305887B (en) | 2012-04-25 |
EP1935299A3 (en) | 2009-08-19 |
CN102028397B (en) | 2013-11-06 |
US7913372B2 (en) | 2011-03-29 |
EP1935299A2 (en) | 2008-06-25 |
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AS | Assignment |
Owner name: MEYER INTELLECTUAL PROPERTIES LIMITED, HONG KONG Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHENG, STANLEY KIN SUI;REEL/FRAME:025844/0990 Effective date: 20071210 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |