Patents by Inventor Dahshen Yu

Dahshen Yu 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).

  • Dentifrice compositions having reduced abrasivity
    Patent number: 6861048
    Abstract: A method for reducing an abrasivity of a dentifrice composition containing an abrasive, includes incorporating into the dentifrice composition a zinc salt in an amount sufficient to reduce a dentinal abrasivity of the composition by at least 10% and reduce an enamel abrasivity of the dentifrice composition by at least 10%. The method provides an improved dentifrice composition, which is at least 90% as effective at stain removal as the original dentifrice composition. Suitable zinc salts include, e.g., zinc citrate, zinc chloride, zinc acetate, zinc oxide and zinc sulfate. Suitable abrasives include, e.g., silica, alumina and alkali metal meta-phosphates.
    Type: Grant
    Filed: July 29, 2002
    Date of Patent: March 1, 2005
    Assignee: Warner-Lambert Company
    Inventors: Dahshen Yu, Rita M. Parikh, Charles Pozzi, Bruce Kohut
  • Dentifrice compositions having reduced abrasivity
    Publication number: 20030026768
    Abstract: A method for reducing an abrasivity of a dentifrice composition containing an abrasive, includes incorporating into the dentifrice composition a zinc salt in an amount sufficient to reduce a dentinal abrasivity of the composition by at least 10% and reduce an enamel abrasivity of the dentifrice composition by at least 10%. The method provides an improved dentifrice composition, which is at least 90% as effective at stain removal as the original dentifrice composition. Suitable zinc salts include, e.g., zinc citrate, zinc chloride, zinc acetate, zinc oxide and zinc sulfate. Suitable abrasives include, e.g., silica, alumina and alkali metal meta-phosphates.
    Type: Application
    Filed: July 29, 2002
    Publication date: February 6, 2003
    Inventors: Dahshen Yu, Rita M. Parikh, Charles Pozzi, Bruce Kohut
  • Zinc containing dentifrice compositions
    Patent number: 6221340
    Abstract: A zinc containing, low pH dentifrice composition provides better bioavailability of the zinc by incorporating a buffer system.
    Type: Grant
    Filed: April 8, 1999
    Date of Patent: April 24, 2001
    Assignee: Warner-Lambert Company
    Inventors: Dahshen Yu, Rita M. Parikh, Charles Pozzi, Bruce Kohut