Patents by Inventor Alexander C. Chan

Alexander C. Chan 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).

  • M-phenylenediamine coupler and oxidative dye compositions containing same
    Patent number: 5199955
    Abstract: 1,5-diamino-2,4-bis(2,2,2-trifluoroethoxy) benzene is a novel m-phenylenediamine coupler and oxidative dye compositions containing same. Stronger dyeing intensity is afforded by use of the novel coupler of the invention.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: April 6, 1993
    Assignee: Clairol Inc.
    Inventors: Yuh-Guo Pan, Mu-Ill Lim, Alexander C. Chan
  • Skin coloring compositions containing indoles and quaternary ammonium salts
    Patent number: 5049381
    Abstract: Compositions containing certain indoles and quaternary ammonium salts are useful for imparting a tan to skin without prolonged exposure to the sun.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: September 17, 1991
    Assignee: Clairol Incorporated
    Inventors: Thomas M. Schultz, George Serban, Alexander C. Chan
  • Skin coloring and sunscreening compositions containing indoles and M-nitro alkoxybenzenes
    Patent number: 5037640
    Abstract: Compositions containing selected indoles and m-nitro alkoxybenzenes are useful for imparting a tan coloration to the skin while concurrently functioning as sun screening compositions.
    Type: Grant
    Filed: November 22, 1989
    Date of Patent: August 6, 1991
    Assignee: Clairol Incorporated
    Inventors: Thomas M. Schultz, George Serban, Alexander C. Chan
  • Processes for coloring and/or conditioning hair
    Patent number: 4975092
    Abstract: A process for coloring and/or conditioning hair using modified primary intermediates and/or a modified coupler containing a hydrophobic group or a group containing a cationic site amenable to reaction with an anionic surfactant; novel modified primary intermediates and modified couplers also being disclosed as well as novel synthetic methods for making these compounds.
    Type: Grant
    Filed: November 16, 1989
    Date of Patent: December 4, 1990
    Assignee: Clairol Incorporated
    Inventors: Alexander C. Chan, Yuh-Guo Pan, Leszek J. Wolfram
  • Skin tanning composition and method
    Patent number: 4968497
    Abstract: The present invention relates to a method of imparting a controlled tanning of skin by treating the skin with an aqueous medium containing melanin or a precursor of melanin.
    Type: Grant
    Filed: August 26, 1988
    Date of Patent: November 6, 1990
    Assignee: Clairol Incorporated
    Inventors: Leszek Wolfram, Alexander C. Chan, Thomas M. Schultz, Bryan P. Murphy