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).

  • Publication number: 20060260072
    Abstract: A primary intermediate for use in hair coloring compositions for oxidative dyeing of hair is 4-amino-2-(1-hydroxy-ethyl)-phenol.
    Type: Application
    Filed: July 31, 2006
    Publication date: November 23, 2006
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 7070630
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein R1 and R2 are each independently selected from hydrogen atoms, a C1 to C5 alkyl or hydroxyalkyl group, or R1 and R2 together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2, with the proviso that when n is equal to 2 only one of R1 and R2 may be hydrogen.
    Type: Grant
    Filed: May 3, 2004
    Date of Patent: July 4, 2006
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 6951574
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R1 and R2 are each individually selected from a hydrogen atom, a C1 to C3 alkyl group, a C1 to C5 mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R1 and R2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
    Type: Grant
    Filed: July 12, 2004
    Date of Patent: October 4, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 6916346
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein R is selected from C1 to C5 alkyl or hydroxyalkyl, a C3 to C6 cyclic ring containing hetero atoms selected from O, S and N atoms, and —CH2—Ar where Ar is an aromatic ring wherein the aromatic ring may be substituted with one or two hydroxy C1 to C3 alkoxy, or amino groups.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: July 12, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 6916347
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R1 and R2 are each individually selected from a hydrogen atom, a C1 to C3 alkyl group, a C1 to C5 mono or dihydroxyalkyl group, phenyl or benzyl optionally substituted with an alkoxy group, or R1 and R2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: July 12, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 6908493
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R1 and R2 are each individually selected from a hydrogen atom, a C1 to C3 alkyl group, a C1 to C5 mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R1 and R2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: June 21, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, James S. Anderson
  • Publication number: 20050091762
    Abstract: Primary intermediate for hair coloring compositions for oxidative dyeing of hair is 4-amino-2-(1-hydroxy-ethyl)-phenol.
    Type: Application
    Filed: November 18, 2004
    Publication date: May 5, 2005
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 6887280
    Abstract: Novel compositions for use in oxidative hair coloring compositions are provided. The compositions comprise one or more oxidative hair coloring N-aryl-m-phenyldiamine derivatives as couplers and one or more diaminopyrazole primary intermediates in combination.
    Type: Grant
    Filed: March 4, 2002
    Date of Patent: May 3, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, Sabina Burdzovic
  • Patent number: 6861556
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of formula (1): wherein X is selected from halogen; R3 is selected from the group consisting of C1 to C2 alkyl and hydroxyethyl; and R, R1 and R2 are each independently selected from C1 to C22 alkyl or C1 to C22 mono or dialkyl groups, or two of R, R1 and R2 together with the the nitrogen atom to which they are attached form a C3 to C6 cycloaliphatic or a C3 to C14 aromatic group, the cycloaliphatic or aromatic group optionally containing in their rings one or more hetero atoms selected from O, S and N atoms.
    Type: Grant
    Filed: May 17, 2004
    Date of Patent: March 1, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 6855174
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein X is selected from halogen and R5SO4 where the halogen is preferably Cl, Br or I; R, R1 and R2 are each individually selected from C1 to C22 alkyl and C1 to C22 mono or dihydroxyalkyl, or two of R, R1 and R2 together with the nitrogen atom to which they are attached form a C3 to C6 saturated or unsaturated ring optionally containing in the ring one or more additional hetero atoms selected from O, S and N atoms; R3 and R4 are each individually selected from C1 to C6 alkyl, C1 to C6 hydroxyalkyl, C1 to C6 alkoxy, C1 to C6 aminoalkyl or R3 and R4 together form a C1 to C5 alkylene group; and R5 is selected from C1 to C22 alkyl and C1 to C22 mono or dihydroxyalkyl.
    Type: Grant
    Filed: May 4, 2004
    Date of Patent: February 15, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, Gottfried Wenke
  • Patent number: 6838561
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R1, and R2 are each individually selected from a hydrogen atom, a C1 to C3 alkyl group, a C1 to C5 mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R1 and R2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: January 4, 2005
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Publication number: 20040255403
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: July 12, 2004
    Publication date: December 23, 2004
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Publication number: 20040211012
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of formula (1): 1
    Type: Application
    Filed: May 17, 2004
    Publication date: October 28, 2004
    Applicant: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Publication number: 20040211011
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: May 3, 2004
    Publication date: October 28, 2004
    Applicant: The Procter & Gamble Company
    Inventors: Mu-Iii Lim, Yuh-Guo Pan
  • Publication number: 20040205909
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: May 7, 2004
    Publication date: October 21, 2004
    Applicant: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, James S. Anderson
  • Publication number: 20040205907
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: May 4, 2004
    Publication date: October 21, 2004
    Applicant: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Publication number: 20040205908
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: May 5, 2004
    Publication date: October 21, 2004
    Applicant: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan
  • Patent number: 6806372
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein X is selected from halogen and R2SO4; R3 is selected from C1 to C2 alkyl or hydroxyethyl; R2 is selected from C1 to C22 alkyl and C1 to C22 mono and dihydroxyalkyl; and R is selected from of C1 to C16 alkyl, C1 to C10 hydroxyalkyl, C1 to C6 alkoxyalkyl and benzyl.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: October 19, 2004
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, Margaret Popp
  • Publication number: 20040204583
    Abstract: Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): 1
    Type: Application
    Filed: May 4, 2004
    Publication date: October 14, 2004
    Inventors: Mu-Ill Lim, Yuh-Guo Pan, Gottfried Wenke
  • Patent number: 6780999
    Abstract: Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): where R1 and R2 are each individually selected from a hydrogen atom, a C1 to C3 alkyl group, a C1 to C5 mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R1 and R2 together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
    Type: Grant
    Filed: January 18, 2002
    Date of Patent: August 24, 2004
    Assignee: The Procter & Gamble Company
    Inventors: Mu-Ill Lim, Yuh-Guo Pan