Patents by Inventor Yuh-Guo Pan

Yuh-Guo Pan 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).

  • Primary intermediates for oxidative coloration of hair
    Publication number: 20020170124
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: November 21, 2002
    Inventors: Mu-III Lim, Yuh-Guo Pan
  • Primary intermediates for oxidative coloration of hair
    Publication number: 20020157192
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 31, 2002
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Primary intermediates for oxidative coloration of hair
    Publication number: 20020148052
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 17, 2002
    Inventors: Mu-lll Lim, Yuh-Guo Pan
  • Primary intermediates for oxidative coloration of hair
    Publication number: 20020144357
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 10, 2002
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Novel couplers for use in oxidative hair dyeing
    Publication number: 20020144361
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 10, 2002
    Inventors: Mu-lll Lim, Yuh-Guo Pan, Gottfried Wenke
  • Primary intermediates for oxidative coloration of hair
    Publication number: 20020144355
    Abstract: Primary intermediates useful hair coloring systems comprise 2-arylaminomethyl-4-aminophenols.
    Type: Application
    Filed: August 16, 2001
    Publication date: October 10, 2002
    Inventors: Mu-lll Lim, Yuh-Guo Pan
  • Primary intermediates for oxidative coloration of hair
    Publication number: 20020144359
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 10, 2002
    Inventors: Mu-lll Lim, Yuh-Guo Pan
  • Novel couplers for use in oxidative hair dyeing
    Publication number: 20020147193
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 10, 2002
    Inventors: Mu-III Lim, Yuh-Guo Pan
  • Primary intermediates for oxidative coloration of hair
    Publication number: 20020144358
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 10, 2002
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Couplers for oxidative coloration of hair
    Publication number: 20020144700
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 10, 2002
    Inventors: Mu-lll Lim, Yuh-Guo Pan, James S. Anderson
  • Primary intermediates for oxidative coloration of hair
    Patent number: 6461391
    Abstract: Primary intermediates useful hair coloring systems comprise quaternized pyrrolidine compounds. The invention provides new quaternized pyrrolidine of Formula (1): wherein X is Cl, Br, I, or R3SO4; R is a C1 to C22 alkyl group or a C1 to C22 mono or dihydroxyalkyl group; R1 and R2 are each independently a C1 to C4 alkyl group; R3 is a C1 to C22 alkyl group or a C1 to C22 mono or dihydroxyalkyl group; R4 is a hydrogen atom, a C1 to C5 alkyl group or such an alkyl group substituted with one or more hydroxy or amino moieties; and R5 is a hydrogen atom or a hydroxy group.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: October 8, 2002
    Assignee: Clairol Incorporated
    Inventors: Mu-III Lim, Yuh-Guo Pan
  • Novel couplers for use in oxidative hair dyeing
    Publication number: 20020138919
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: January 18, 2002
    Publication date: October 3, 2002
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, James S. Anderson
  • Novel coupler for use in oxidative hair dyeing
    Publication number: 20020108187
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of formula (1): 1
    Type: Application
    Filed: November 16, 2001
    Publication date: August 15, 2002
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • PRIMARY INTERMEDIATES FOR OXIDATIVE COLORATION OF HAIR
    Publication number: 20020106341
    Abstract: Primary intermediates useful hair coloring systems comprise quaternized pyrrolidine compounds.
    Type: Application
    Filed: December 6, 2000
    Publication date: August 8, 2002
    Inventors: Mu-III Lim, Yuh-Guo Pan
  • Novel coupler for use in oxidative hair dyeing
    Publication number: 20020102224
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of formula (1): 1
    Type: Application
    Filed: November 16, 2001
    Publication date: August 1, 2002
    Inventors: Mu-Iii Lim, Yuh-Guo Pan, Margaret Popp
  • Novel coupler for use in oxidative hair dyeing
    Publication number: 20020100126
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: November 16, 2001
    Publication date: August 1, 2002
    Inventors: Mu-III Lim, Yuh-Guo Pan, Margaret Popp
  • Novel coupler for use in oxidative hair dyeing
    Publication number: 20020100127
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: November 16, 2001
    Publication date: August 1, 2002
    Inventors: Mu-lll Lim, Yuh-Guo Pan, James S. Anderson
  • Coupler for use in oxidative hair dyeing
    Patent number: 6409773
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula at least one coupler comprising a compound of the formula (1): wherein R is selected from of C1 to C2 alkyl and hydroxyethyl, R1 and R2 are each independently selected from the group consisting of C1 to C5 alkyl, C3 to C6 cycloalkyl, C1 to C5 alkoxy, C1 to C5 hydroxyalkyl, C1 to C5 hydroxyalkoxy, or R1 and R2 together with the carbon atom to which they are attached form a C3 to C6 cycloalkyl group.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: June 25, 2002
    Assignee: Clairol Incorporated
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, Margaret Popp
  • Primary intermediate for use in oxidative hair dyeing
    Patent number: 6342079
    Abstract: 1-(2,5-Diaminophenyl)ethanol useful as a primary intermediate for the oxidative dyeing of hair.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: January 29, 2002
    Assignee: Bristol-Myers Squibb Company
    Inventors: Yuh-Guo Pan, Mu-Ill Lim, Linas R. Stasaitis
  • Primary intermediate in oxidative hair dyeing
    Patent number: 6228130
    Abstract: 5-Nitroisatin is reacted with sodium hydroxide to produce an &agr;-keto acid sodium salt that is reduced with borane-tetrahydrofuran complex and then hydrogenated to produce 1-(2,5-diaminophenyl)ethylene glycol, a novel compound useful as a primary intermediate in the production of oxidative hair dyes.
    Type: Grant
    Filed: November 3, 1998
    Date of Patent: May 8, 2001
    Assignee: Bristol-Myers Squibb Company
    Inventors: Mu-Ill Lim, Linas R. Stasaitis, Yuh-Guo Pan, Michael Y. M. Wong