US20070163064A1 - Oral care implement comprising an elastomeric polypropylene-ethylene copolymer - Google Patents
Oral care implement comprising an elastomeric polypropylene-ethylene copolymer Download PDFInfo
- Publication number
- US20070163064A1 US20070163064A1 US11/460,411 US46041106A US2007163064A1 US 20070163064 A1 US20070163064 A1 US 20070163064A1 US 46041106 A US46041106 A US 46041106A US 2007163064 A1 US2007163064 A1 US 2007163064A1
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- US
- United States
- Prior art keywords
- oral care
- care implement
- copolymer
- head
- handle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
- A46B15/0055—Brushes combined with other articles normally separate from the brushing process, e.g. combs, razors, mirrors
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
- A46B15/0055—Brushes combined with other articles normally separate from the brushing process, e.g. combs, razors, mirrors
- A46B15/0069—Brushes fitted with a interdental devices, e.g. toothpick
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B15/00—Other brushes; Brushes with additional arrangements
- A46B15/0055—Brushes combined with other articles normally separate from the brushing process, e.g. combs, razors, mirrors
- A46B15/0081—Brushes with a scraper, e.g. tongue scraper
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
- A46B5/002—Brush bodies; Handles integral with brushware having articulations, joints or flexible portions
- A46B5/0025—Brushes with elastically deformable heads that change shape during use
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
- A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
- A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
- A46B5/026—Grips or handles having a nonslip section
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- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B2200/00—Brushes characterized by their functions, uses or applications
- A46B2200/10—For human or animal care
- A46B2200/1066—Toothbrush for cleaning the teeth or dentures
Abstract
An oral care implement has one or more components, such as a handle or a gripping portion thereof, prepared from an elastomeric propylene-ethylene copolymer. The elastomeric copolymer provides a comfortable and non-slippery gripping surface in a variety of conditions, including both wet and dry environments, and also provides flexible characteristics which are particularly well suited for hinged handle designs.
Description
- The application claims the benefit of priority of U.S. Patent Application No. 60/702,736, filed Jul. 27, 2005, in which the contents are incorporated by reference herein.
- The present invention is directed to an oral care implement, and more particularly, to an oral care implement comprising having one or more components constructed from elastomeric propylene-ethylene copolymers.
- Oral care implements, particularly toothbrush handles, traditionally have been manufactured with rigid materials such as polypropylene, polystyrene, polyethylene, acrylonitrile-styrene copolymer, or cellulose acetate propionate. Toothbrush handles constructed from such rigid materials can be uncomfortable to grip and difficult to manipulate during brushing. In addition, the rigid handles can become slippery in wet conditions which often are encountered during brushing.
- One approach has been to provide a rigid handle overmolded with an elastomer to improve comfort and ease of manipulation of the toothbrush. For example, US 2004/0025272 to Stvartak et al., incorporated herein by reference, discloses a toothbrush having a handle constructed from a rigid base member, such as polypropylene or polyethylene, overmolded with elastomer, such as urethane, styrene/ethylene/butylene-styrene elastomer, metallocene elastomers, e.g., Engage® (a polyolefin elastomer available from DuPont Dow Elastomers), or fully vulcanized ethylene-propylene-diene-monomers in a continuous matrix of polypropylene. However, such elastomers tend to be expensive and add significant cost to the manufacture of the toothbrush.
- Flexible materials also have been used in portions of toothbrush handles to increase user comfort by limiting the amount of force applied to the teeth and gums during brushing. For example, US 2004/0128780 to Chan, incorporated herein by reference, describes an electric toothbrush having a flexible neck made from a mixture of a first polymer, such as polypropylene, and a second polymer having a lower flexural modulus than the first polymer. The second polymer can be a thermoplastic elastomer (“TPE”), a thermoplastic olefin (“TPO”), a soft thermoplastic polyolefin, or other elastomeric material such as ethylene-vinylacetate copolymer or ethylene propylene rubber.
- There remains a need for alternative materials for constructing components of oral care implements, particularly materials which are cost effective while concomitantly providing benefits such as non-slip gripping surfaces, enhanced tactile feel and user comfort.
- The present invention is directed to an oral care implement having one or more components constructed from an elastomeric propylene-ethylene copolymer preferably having a Shore A hardness of less than about 80. Such elastomer can be used to construct components including, but not limited to, the handle, or a gripping portion thereof, a toothpick section, a head section or portion thereof, a bristle section, a tongue cleaning element, elastomeric tooth cleaning element, and/or holding sections, e.g., pockets used for dispersing fragrance or flavor-yielding capsules. Such elastomer can be overmolded onto or injection molded with a thermoplastic material, such as polypropylene, to form a handle or other component of the oral care implement.
- When used in the handle portion, the elastomer provides a comfortable and non-slippery gripping surface in a variety of conditions, including dry environments as well as the wet or slurry environments often encountered during brushing. The elastomer also provides flexible characteristics which are particularly well suited for flexible heads or other hinged handle designs. In addition, the elastomeric material can be incorporated into other components such as, but not limited to, bristles and/or a flexible pick.
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FIG. 1 is a perspective view of a toothbrush in accordance with one embodiment of the invention; -
FIG. 2 is a top plan view of the toothbrush ofFIG. 1 ; -
FIG. 3 is a side elevation view of the toothbrush ofFIG. 1 ; -
FIG. 4 illustrates a flexible toothbrush head in accordance with one embodiment of the invention; -
FIG. 5 is a bottom plan view of the flexible head shown inFIG. 4 ; -
FIG. 6 is a perspective view of a toothbrush in accordance with another embodiment of the invention; and -
FIG. 7 is a perspective view of a toothbrush in accordance with another embodiment of the invention. - While the invention is illustrated and described primarily with reference to manual toothbrushes, it should be understood that oral care implements are inclusive of a variety of other types of devices, such as powered toothbrushes, inter-proximal picks, flossing tools, plaque scrapers, tongue and soft tissue cleansers/massagers and the like.
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FIGS. 1-3 illustrate a toothbrush 1 having ahandle 2, ahead 3 containing cleaning elements such asbristles 4, apick 5, a plurality ofsockets 6, and a texturedtongue cleaning element 9. Thehandle 2 preferably is designed to enable the user to easily grip and manipulate the toothbrush. More particularly, thehandle 2 preferably is shaped and/or includes ergonomic features to provide a higher degree of control for the user while maintaining comfort. Examples of ergonomic features include an overmoldedgrip portion 7 that can be segmented and ergonomically sized for users, and the inclusion of sections that are angled relative to each other and/or which are wider or narrower than other portions of the handle to provide increased control and comfort during use. In the embodiment shown inFIGS. 1-3 , atextured grip portion 8 is provided in the center region of thehandle 2 to provide a non-slip surface for the user to grip the toothbrush between the thumb and forefinger. Thegrip portion 8 can, for example, be provided on the same side of thehandle 2 as thebristles 4, on the opposite side of thehandle 2 as thebristles 4, or on both sides as shown inFIG. 3 . - Preferably, the
head 3,bristles 4,pick 5, andsockets 6 are ergonomically sized and shaped to facilitate tooth cleaning, including interproximal tooth cleaning. Thehead 3 can be generally elliptical or rectangular in shape, for example, although other configurations are contemplated. Thebristles 4 extend from the surface ofhead 3 and can be of conventional size and spacing for effective tooth cleaning. Thepick 5 can have a size and conical shape adapted to promote interproximal cleaning effectiveness. - The
head 3 may integral with or permanently attached to thehandle 2, or may be replaceable. One or more other oral surface engaging elements, such as a flossing element, plaque scrapper, and the like, may also be present on the toothbrush 1. - Although a toothbrush is illustrated in
FIGS. 1-3 as having such features as apick 5,sockets 6,grip portions tongue scrape element 9, it should be understood that each of these features is optional and merely illustrative. In practice, the toothbrush can have these any of these features alone or in any combination with other features not illustrated herein. It will also be appreciated that while the cleaning elements are illustrated herein as tufts ofbristles 4, other cleaning elements of varying size, shape, cross-section and material may be used. - The device may have concave molded portions for holding and dispensing fragrance, flavorants, actives or other materials. As illustrated in
FIGS. 1-3 , for example, a plurality ofsockets 6 may be located at one or both ends of thehandle 2. Thesockets 6 can be sized and shaped to releasably hold fragrance, flavor-yielding capsules, or other materials to be dispensed. For example, thesockets 6 can be molded from the elastomeric material as concave hemispheres of suitable dimensions to enable flavor-yielding capsules to be easily dispensed and replaced. Alternatively, thesockets 6 can be configured to hold commercially available fragrance or flavor yielding gel capsules. - The
head 3 may be rigid or flexible. WhileFIGS. 1-3 show an embodiment having a rigid head,FIGS. 4-6 illustrate examples of toothbrush configurations having flexible heads.FIG. 4 shows aflexible head 12 of a toothbrush shown in U.S. Pat. No. 5,758,383, which is incorporated by reference herein, having first 14 and second 16 sections and an elastomer section orjoint 18 located therebetween. - The handle and head sections are preferably molded from a plastic or resin such as polypropylene, while the
joint 18 can be formed from the propylene-ethylene copolymer elastomer of the invention. From the view shown inFIG. 5 , it can be seen that the elastomer-containingsection 18 spans the width of thehead sections -
FIG. 6 illustrates another embodiment of atoothbrush 80 having ahead 87 that can be rigid or flexible as described in connection with the embodiment ofFIGS. 4-5 . Thehead 87 has cleaning elements in the form ofbristles 86 and a plurality ofelastomeric massaging elements 94 disposed around a perimeter portion. Theelastomeric massaging elements 94 can be molded from the propylene-ethylene copolymer elastomer. Theelastomeric massaging elements 94 typically are slightly longer than thebristles 86 and can be used to massage the gums during brushing. Other portions of the toothbrush, such asgrip portions -
FIG. 7 shows another embodiment of atoothbrush 100 having asupport 101 including ahandle 103 and a head 105, andtooth cleaning elements 200 as shown in US 2005-0000048, which is incorporated herein by reference. The head 105 also includes distal cleaning elements 203 a-b at thedistal end 107 and straddling a longitudinal axis of thetoothbrush 100. The distal cleaning elements 203 a-b typically protrude higher from thebase surface 109 than the tips of the other tooth cleaning elements. Thetooth cleaning elements 200 also can include arcuate cleaning elements 211 a-b and central cleaning elements 207 a-c. Any or all of the distal cleaning elements 203 a-b, central cleaning elements 207 a-c, and arcuate cleaning elements 211 a-b, can be formed from the elastomeric propylene-ethylene copolymer. - The propylene-ethylene copolymer elastomer can be incorporated into the various components of the toothbrush using conventional molding techniques well known to those of ordinary skill, such as overmolding or co-injection molding techniques. The elastomer can be used to form a handle or a portion thereof, a flexible joint in the head, a flexible pick, elastomeric cleaning elements, bristles, a tongue cleaning element, other components of an oral care implement, or any combination thereof.
- Suitable propylene-ethylene copolymer elastomers which can be used the practice of the present invention are commercially available, such as Versify® which is available from Dow Chemical Company. The elastomeric propylene-ethylene copolymer can be prepared using metallocene polymerization, such as by using
Group 4 metal complex catalysts as described in US 2004/0087751 to Tau et al., the disclosure of which is hereby incorporated by reference. The copolymer preferably has a molecular weight distribution of about 2 to 3. Molecular weight distribution is the ratio of weight average molecular weight (Mw) to number average molecular weight (Mn). Other preferred physical properties of the propylene-ethylene copolymers include a comonomer content of from about 5 to about 15 wt %; a density of about 0.8 to 0.9 g/cc, preferably from about 0.858 to 0.888 g/cc; a Shore A hardness (ASTM D-2240) of from 30 to 80, preferably from about 50 to about 75; a glass transition temperature (ASTM E1356-98) of from about −15 to about −35° C.; and a flexural modulus (ASTM D-790A) of from about 1,000 to about 40,000 psi. - Another example of a commercially available elastomer which can be used is Vistamaxx®, a metallocene catalyst-based elastomer available from ExxonMobil. This polymer has a Shore A hardness ranging from about 30 to about 65; a specific gravity of 0.86-0.99; a melt flow rate (ASTM D-1238) of 1-20 g/10 min; a glass transition temperature of from about −20 to about −30° C.; a melting temperature of from about 40 to about 160° C.; a tensile strength (ASTM D-638) of about 2200-400 p.s.i.; a flexural modulus of from about 1,000 to about 3,000 psi; and an elongation at break (ASTM D-638) of about 100-1500%.
- The propylene-ethylene copolymer elastomers described in this invention are inherently elastomeric in the as-polymerized form. Other Thermoplastic Elastomers (TPE) commonly used are either a compound of copolymers (e.g., Styrenic block copolymers, fillers, mobilizers (e.g., paraffin oil, paraffin wax, etc.) and other additives; or a compound of polypropylene, particles of vulcanized or non-vulcanized synthetic elastomers and other additives. In comparison, the propylene-ethylene copolymer elastomers described in this invention are inherently and consistently lower in manufacturing cost since the more cumbersome blending and compounding steps are generally not required. Moreover, the propylene-ethylene copolymer elastomers avoid the need for various fillers and additives found in many Thermoplastic Elastomers (TPE) that can result in non-compliance with food contact requirements as regulated by the FDA or its equivalence.
- The propylene-ethylene copolymer elastomer preferably is blended with a polyolefin such as polypropylene homopolymer and/or polypropylene copolymers. Non-limiting examples of other blending polyolefins include high density polyethylene (HDPE) and low density polyethylene (LDPE). The amount of polyolefin blended with the elastomer depends on such factors as the desired physical properties of the molded section and the specific molding operation employed. Most often, the amount of polyolefin used ranges from about 5 to about 20 wt %. In general, higher levels of polyolefin (and/or nucleating agents) reduce molding time and improve molding properties, but also detract from the desirable properties imparted by the elastomer, e.g., softness, non-slip grip, etc. Polypropylene is a preferred material for blending, particularly for compatibility purposes when the blend is overmolded onto a polypropylene substrate base.
- In an alternative embodiment, an oral care implement has one or more components constructed from a propylene-ethylene copolymer elastomer having a Shore A hardness of from about 30 to about 80, blended with a thermoplastic vulcanizate (TPV). The elastomer/TPV blend can be used to construct the handle, or a gripping portion thereof, a toothpick section, a head section or portion thereof, a bristle section, a tongue cleaning element, elastomeric tooth cleaning element, and/or holding sections, e.g., pockets used for dispersing fragrance or flavor-yielding capsules. One preferred propylene-ethylene copolymer elastomer for this embodiment is Versify® available from Dow Chemical, although other propylene-ethylene copolymer elastomers as described above also can be used. The elastomer/TPV blend can be used to construct one or more components of an oral care implement as described with reference to the previous embodiment(s).
- The presence of TPV in the elastomer improves molding properties without significantly detracting from the desired softness and other properties of the elastomer. Non-limiting examples of TPVs that may be used include Vyram™ and Santoprene™, available from ExxonMobil.
- The propylene-ethylene copolymer elastomers also can be blended with one or more additives, non-limiting examples of which include organic or inorganic fillers, light stabilizers, plasticizers, processing aids (such as oils or stearic acid), colorants or pigments. Appropriate loadings of such additives will be apparent to persons of ordinary skill in the art with the aid of no more than routine experimentation. The additives should not interfere with the desired physical properties of the elastomer.
- It will be understood that while the invention has been described in conjunction with specific embodiments thereof, the foregoing description and examples are intended to illustrate, but not limit the scope of the invention. While specific toothbrush configurations have been illustrated, the present invention is not limited to any of the aesthetic aspects shown and, in practice, may differ significantly from the illustrated configurations.
Claims (25)
1. An oral care implement comprising an elastomeric propylene-ethylene copolymer.
2. The oral care implement of claim 1 wherein the copolymer comprises a Shore A hardness of less than about 80.
3. The oral care implement of claim 2 wherein the copolymer has an ethylene comonomer content of from about 5 to about 15 wt %.
4. The oral care implement of claim 2 wherein the copolymer has a density of about 0.8 to 0.9 g/cc.
5. The oral care implement of claim 2 wherein the copolymer has a glass transition temperature of from about −15 to about −35° C.
6. The oral care implement of claim 2 wherein the copolymer has a flexural modulus of from about 1,000 to about 40,000 psi.
7. The oral care implement of claim 6 wherein the flexural modulus is from about 1,000 to about 3,000 psi.
8. The oral care implement of claim 2 wherein the copolymer has an elongation at break of about 100 to about 1500%.
9. The oral care implement of claim 2 wherein the copolymer has a molecular weight distribution of from about 2 to 3.
10. The oral care implement of claim 1 wherein the copolymer is blended with a polyolefin.
11. The oral care implement of claim 1 wherein the copolymer is blended with a thermoplastic vulcanizate.
12. The oral care implement of claim 1 wherein the copolymer is blended with a nucleating agent.
13. The oral care implement of claim 1 wherein the copolymer has a Shore A hardness from about 30 to about 65.
14. The oral care implement of claim 1 further comprising a toothbrush handle or a grip portion thereof comprised of said copolymer.
15. The oral care implement of claim 1 further comprising a toothbrush head or portion thereof comprised of said copolymer.
16. The oral care implement of claim 15 wherein the head is a flexible head having a joint constructed from the copolymer.
17. The oral care implement of claim 1 further comprising a bristle portion comprised of said copolymer.
18. The oral care implement of claim 1 further comprising at least one of a handle, a gripping portion of a handle, a toothpick section, a head section or portion thereof, a bristle section, a tongue cleaning element, an elastomeric tooth cleaning element, and a holding section comprised of said copolymer.
19. An oral care implement comprising a handle and a head, wherein at least a portion of the handle, head, or both, is constructed from an elastomeric propylene-ethylene copolymer having a Shore A hardness of less than about 80, an ethylene comonomer content of from about 5 to about 15 wt %, a density of about 0.8 to 0.9 g/cc, a glass transition temperature of from about negative 15 to about negative 35° C., and a flexural modulus of from about 1,000 to about 40,000 psi.
20. The oral care implement of claim 19 wherein the head comprises a flexible joint constructed from the elastomeric copolymer.
21. The oral care implement of claim 19 wherein the handle comprises a grip portion constructed from the elastomeric copolymer.
22. The oral care implement of claim 19 wherein the head comprises a plurality of bristles constructed from the elastomeric copolymer.
23. The oral care implement of claim 19 wherein the copolymer is blended with a polyolefin.
24. The oral care implement of claim 19 wherein the copolymer is blended with a thermoplastic vulcanizate.
25. The oral care implement of claim 17 wherein the copolymer is blended with a nucleating agent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/460,411 US20070163064A1 (en) | 2005-07-27 | 2006-07-27 | Oral care implement comprising an elastomeric polypropylene-ethylene copolymer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US70273605P | 2005-07-27 | 2005-07-27 | |
US11/460,411 US20070163064A1 (en) | 2005-07-27 | 2006-07-27 | Oral care implement comprising an elastomeric polypropylene-ethylene copolymer |
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US20070163064A1 true US20070163064A1 (en) | 2007-07-19 |
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ID=37428616
Family Applications (1)
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US11/460,411 Abandoned US20070163064A1 (en) | 2005-07-27 | 2006-07-27 | Oral care implement comprising an elastomeric polypropylene-ethylene copolymer |
Country Status (11)
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US (1) | US20070163064A1 (en) |
EP (1) | EP1906790A1 (en) |
KR (1) | KR20080026657A (en) |
CN (1) | CN101296635A (en) |
AU (1) | AU2006275960A1 (en) |
BR (1) | BRPI0614159A2 (en) |
CA (1) | CA2616518A1 (en) |
MX (1) | MX2008001108A (en) |
RU (1) | RU2371069C1 (en) |
TW (1) | TW200722006A (en) |
WO (1) | WO2007016066A1 (en) |
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US20070174985A1 (en) * | 2006-01-27 | 2007-08-02 | Steven Joe Jr | Toothbrush with tongue scraper/cleaner |
US20080184511A1 (en) * | 2007-02-02 | 2008-08-07 | The Gillette Company | Oral hygiene implements having flexible elements, and methods of making the same |
US20090182364A1 (en) * | 2008-01-14 | 2009-07-16 | Mettler Jr Gilbert William | Tongue retraction and cleaning method and apparatus |
US20090229063A1 (en) * | 2006-06-30 | 2009-09-17 | Josef Merl | Toothbrush |
US20090313778A1 (en) * | 2008-06-20 | 2009-12-24 | Colgate-Palmolive | Toothbrush With Visual and/or Other Sensory Effects |
US20100319149A1 (en) * | 2007-06-26 | 2010-12-23 | Live-Right, Llc | Infant toothbrush |
US20110049918A1 (en) * | 2009-08-26 | 2011-03-03 | Le Creuset Sas | Utensil handle |
USD645252S1 (en) | 2008-08-15 | 2011-09-20 | Mcneil-Ppc, Inc. | Toothbrush |
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US20120192369A1 (en) * | 2010-11-22 | 2012-08-02 | Juergen Mohr | Toothbrush |
US20120272984A1 (en) * | 2010-09-03 | 2012-11-01 | Marni Markell Hurwitz | Oral hygiene implement and method of use |
USD680747S1 (en) | 2008-09-30 | 2013-04-30 | Dr. Fresh, Llc | Toothbrush feature |
US20130220363A1 (en) * | 2012-02-23 | 2013-08-29 | Saam Zarrabi | Disposable teeth cleaning system |
US20130307187A1 (en) * | 2009-12-18 | 2013-11-21 | Colgate-Palmolive Company | Oral Care Implement Having Multiple Soft Tissue Cleaner Components |
US20140047656A1 (en) * | 2011-11-22 | 2014-02-20 | The Procter & Gamble Company | Method for producing a toothbrush handle having an inner cavity |
US20140137350A1 (en) * | 2011-11-22 | 2014-05-22 | The Procter & Gamble Company | Toothbrush having an inner cavity |
US8740788B1 (en) | 2010-06-04 | 2014-06-03 | Gil Mettler | Tongue retraction method and apparatus with relief notch |
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Also Published As
Publication number | Publication date |
---|---|
BRPI0614159A2 (en) | 2016-11-22 |
RU2008107322A (en) | 2009-09-10 |
AU2006275960A1 (en) | 2007-02-08 |
CA2616518A1 (en) | 2007-02-08 |
KR20080026657A (en) | 2008-03-25 |
CN101296635A (en) | 2008-10-29 |
TW200722006A (en) | 2007-06-16 |
RU2371069C1 (en) | 2009-10-27 |
EP1906790A1 (en) | 2008-04-09 |
MX2008001108A (en) | 2008-03-11 |
WO2007016066A1 (en) | 2007-02-08 |
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Legal Events
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AS | Assignment |
Owner name: COLGATE-PALMOLIVE COMPANY, NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WONG, CHI SHING;ROONEY, MICHAEL CHARLES;REEL/FRAME:018325/0010 Effective date: 20050727 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |