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).

  • Patent number: 5294438
    Abstract: 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: Grant
    Filed: April 13, 1992
    Date of Patent: March 15, 1994
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert W. H. Chang, Wayne K. Dunshee, Jeffrey F. Andrews
  • Patent number: 5013473
    Abstract: 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: Grant
    Filed: February 25, 1988
    Date of Patent: May 7, 1991
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert J. Norbury, Robert W. H. Chang, Lowell C. Zeller
  • Patent number: 4976961
    Abstract: The size of microcapsules having cosmetic emollient oils is increased by the inclusion of viscosity increasing agents with the oils.
    Type: Grant
    Filed: July 18, 1986
    Date of Patent: December 11, 1990
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert J. Norbury, Robert W. H. Chang
  • Patent number: 4876136
    Abstract: 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: Grant
    Filed: June 22, 1987
    Date of Patent: October 24, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert W. H. Chang, Keith E. Relyea
  • Patent number: 4769022
    Abstract: 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: Grant
    Filed: May 2, 1986
    Date of Patent: September 6, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Robert W. H. Chang, Joseph P. Kronzer
  • Patent number: 4755433
    Abstract: 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: Grant
    Filed: October 30, 1986
    Date of Patent: July 5, 1988
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Vinu Patel, Robert W. H. Chang
  • Patent number: 4510127
    Abstract: 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: Grant
    Filed: September 27, 1982
    Date of Patent: April 9, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert W. H. Chang
  • Patent number: 4485090
    Abstract: 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: Grant
    Filed: September 27, 1982
    Date of Patent: November 27, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert W. H. Chang
  • Patent number: 4470964
    Abstract: 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: Grant
    Filed: September 27, 1982
    Date of Patent: September 11, 1984
    Assignee: Minnesota Minning and Manufacturing Company
    Inventor: Robert W. H. Chang
  • Patent number: 4462224
    Abstract: 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: Grant
    Filed: July 11, 1983
    Date of Patent: July 31, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Wayne K. Dunshee, Robert W. H. Chang
  • Patent number: 4428930
    Abstract: 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: Grant
    Filed: September 27, 1982
    Date of Patent: January 31, 1984
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert W. H. Chang
  • Patent number: 4366146
    Abstract: 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: Grant
    Filed: September 18, 1981
    Date of Patent: December 28, 1982
    Assignee: Minnesota Mining & Manufacturing Co.
    Inventor: Robert W. H. Chang
  • Patent number: 4304766
    Abstract: 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: Grant
    Filed: August 11, 1980
    Date of Patent: December 8, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert W. H. Chang
  • Patent number: 4243658
    Abstract: 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: Grant
    Filed: April 2, 1979
    Date of Patent: January 6, 1981
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert W. H. Chang
  • Patent number: 4170636
    Abstract: 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: Grant
    Filed: December 29, 1977
    Date of Patent: October 9, 1979
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Michael R. Engel, Robert W. H. Chang, Linda L. LaFleur
  • Patent number: 4164563
    Abstract: 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: Grant
    Filed: March 24, 1975
    Date of Patent: August 14, 1979
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert W. H. Chang
  • Patent number: RE31787
    Abstract: 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: Grant
    Filed: May 7, 1982
    Date of Patent: January 1, 1985
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Robert W. H. Chang