Patents by Inventor Robert W. H. Chang
Robert W. H. Chang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 5294438Abstract: The lubricity of any shaving preparation is enhanced by providing an emollient oil and a thermoplastic polymeric elastomer additive in an amount effective to increase its lubricity. Specific shaving preparations suitable for application to human or animal skin may comprise at least 5% by weight of an emollient oil, and a thermoplastic polymeric elastomer additive in a ratio of emollient oil to additive of between about 5:1 and 20:1, and preferably in a ratio of between about 8:1 and 10:1. Shaving creams generally contain 5-30% of an emollient oil, a thermoplastic polymeric elastomer additive present in a ratio of emollient oil to additive of between about 5:1 and 20:1, and at least 5% by weight of soap, detergent or a combination thereof.Type: GrantFiled: April 13, 1992Date of Patent: March 15, 1994Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert W. H. Chang, Wayne K. Dunshee, Jeffrey F. Andrews
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Patent number: 5013473Abstract: The use of frangible microcapsules in cleansing creams and cold creams and other cosmetic products improves their cleansing, cleaning, and removal properties without damage to the skin.Type: GrantFiled: February 25, 1988Date of Patent: May 7, 1991Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert J. Norbury, Robert W. H. Chang, Lowell C. Zeller
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Patent number: 4976961Abstract: The size of microcapsules having cosmetic emollient oils is increased by the inclusion of viscosity increasing agents with the oils.Type: GrantFiled: July 18, 1986Date of Patent: December 11, 1990Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert J. Norbury, Robert W. H. Chang
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Patent number: 4876136Abstract: Wax-base or emollient-base cosmetic compositions may be provided as samples on carrying sheets by providing the carrying sheet with a window sheet having a hole therein to expose said cosmetic composition, and a cover sheet over said window sheet to protect said exposed composition from incidental contact.Type: GrantFiled: June 22, 1987Date of Patent: October 24, 1989Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert W. H. Chang, Keith E. Relyea
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Patent number: 4769022Abstract: A nonwoven cleansing pad is provided. The pad comprises high-sorbency, liquid sorbent fibers capable of forming a hydrogelatinous outer surface by sorption of liquid and thermally bondable binder fibers. The cleansing pad is substantially free of supplemental lubricant and is integrally self-lubricating when wet with water.Type: GrantFiled: May 2, 1986Date of Patent: September 6, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: Robert W. H. Chang, Joseph P. Kronzer
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Patent number: 4755433Abstract: Wax-base or emollient-base cosmetic compositions may be provided as samples on paper carrying sheets by providing the paper with materials that prevent absorption of oleic materials and providing the cosmetic compositions with a lower sheet that is oleophobic. A binder layer of an oleophilic wax or polymer may be used between said paper and the cosmetic composition. A frangible, thin polymeric film is placed over the cosmetic composition to prevent shear forces and pressure from smearing the composition.Type: GrantFiled: October 30, 1986Date of Patent: July 5, 1988Assignee: Minnesota Mining and Manufacturing CompanyInventors: Vinu Patel, Robert W. H. Chang
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Patent number: 4510127Abstract: A dentifrice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces elution of a previously applied therapeutic agent.Type: GrantFiled: September 27, 1982Date of Patent: April 9, 1985Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert W. H. Chang
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Patent number: 4485090Abstract: A dentifrice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces elution of a previously applied therapeutic agent.Type: GrantFiled: September 27, 1982Date of Patent: November 27, 1984Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert W. H. Chang
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Patent number: 4470964Abstract: A dentifrice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces, elution of a previously applied therapeutic agent.Type: GrantFiled: September 27, 1982Date of Patent: September 11, 1984Assignee: Minnesota Minning and Manufacturing CompanyInventor: Robert W. H. Chang
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Patent number: 4462224Abstract: A three-compartment, instant hot or cold, reusable cold pack for transferring heat to or from an object. A first compartment contains a predetermined amount of a solvent comprised primarily of water. A second compartment contains a predetermined amount of a solute capable of essentially completely dissolving in the solvent. A third compartment contains a gelling agent capable of gelling with the solvent and solute solution and producing a gel that is relatively soft and moldable when frozen.Type: GrantFiled: July 11, 1983Date of Patent: July 31, 1984Assignee: Minnesota Mining and Manufacturing CompanyInventors: Wayne K. Dunshee, Robert W. H. Chang
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Patent number: 4428930Abstract: A dentifrice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces elution of a previously applied therapeutic agent.Type: GrantFiled: September 27, 1982Date of Patent: January 31, 1984Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert W. H. Chang
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Patent number: 4366146Abstract: A dentifrice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces elution of a previously applied therapeutic agent.Type: GrantFiled: September 18, 1981Date of Patent: December 28, 1982Assignee: Minnesota Mining & Manufacturing Co.Inventor: Robert W. H. Chang
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Patent number: 4304766Abstract: A dentifrice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces elution of a previously applied therapeutic agent.Type: GrantFiled: August 11, 1980Date of Patent: December 8, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert W. H. Chang
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Patent number: 4243658Abstract: A dentifrice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces elution of a previously applied therapeutic agent.Type: GrantFiled: April 2, 1979Date of Patent: January 6, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert W. H. Chang
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Patent number: 4170636Abstract: A dentifrice composition is provided which contains a compound having the formula (R.sub.f).sub.m YX wherein R.sub.f is a fluoroaliphatic radical having from about 4 to 16 carbon atoms; Y is a calcium-complexing moiety; X is a terminal group which does not interfere with the complexing ability of said calcium-complexing moiety; and m is an integer of at least one. A method of inhibiting plaque formation in an oral environment is also provided.Type: GrantFiled: December 29, 1977Date of Patent: October 9, 1979Assignee: Minnesota Mining and Manufacturing CompanyInventors: Michael R. Engel, Robert W. H. Chang, Linda L. LaFleur
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Patent number: 4164563Abstract: Compositions for topical application to skin are provided wherein greasy, occlusive viscous bases are made non-greasy while remaining occlusive. The compositions comprise a mixture of from about 40 to 90%, and preferably from about 60 to 90%, by weight of a greasy viscous base and from about 10 to 60%, and preferably from about 10 to 40%, by weight of a solid, nonirritating ointment forming powder having a number average maximum dimension of less than about 30 microns. Said viscous base is substantially nonabsorbed by said powder at temperatures below about 50.degree. C. Other ingredients such as colorants, consistency modifiers, medicaments, etc. may optionally be added to the compositions.Type: GrantFiled: March 24, 1975Date of Patent: August 14, 1979Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert W. H. Chang
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Patent number: RE31787Abstract: A dentrifice composition containing a water-dispersible, membrane-forming material which, when applied to tooth surfaces in an oral environment, attaches thereto and forms a substantially continuous, hydrophobic barrier thereon which substantially reduces elution of a previously applied therapeutic agent.Type: GrantFiled: May 7, 1982Date of Patent: January 1, 1985Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert W. H. Chang