Patents by Inventor Leszek Wolfram

Leszek Wolfram 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).

  • Process for the manufacture of a hair dye product containing 5,6-dihydroxyindole
    Patent number: 5704949
    Abstract: The present invention is directed to the preparation of an aqueous hair dyeing composition containing an effective hair dyeing amount--at least 2 mg/ml--5,6-dihydroxyindole (DHI). An aqueous hair dyeing composition is produced by reacting under essentially anaerobic conditions dopa or a salt thereof with an alkali metal ferricyanide oxidant in an aqueous reaction medium to obtain dopachrome, and permitting the dopachrome to undergo rearrangement in the aqueous medium to form 5,6-dihydroxyindole, said rearrangement being conducted in the substantial absence of oxidant, the aqueous medium being buffered by sufficient buffering agent to maintain a pH of from about 4.5 to about 9 for the reaction medium throughout the series of reactions that take place thereafter, removing the ferrocyanide species present in the aqueous system, and lastly, charging the composition into a suitable container.
    Type: Grant
    Filed: February 16, 1996
    Date of Patent: January 6, 1998
    Assignee: Clairol Incorporated
    Inventors: Giuseppe Prota, Gottfried Wenke, Leszek Wolfram
  • Acidic post-treatment of hair dyed with dihydroxyindole
    Patent number: 5665336
    Abstract: A process for altering the color of hair that has been dyed with dihydroxyindole comprising the steps of treating the dyed hair with an acidic solution for an effective amount of time and rinsing the treated hair.
    Type: Grant
    Filed: August 21, 1995
    Date of Patent: September 9, 1997
    Assignee: Bristol-Myers Squibb Company
    Inventor: Leszek Wolfram
  • Process and kit for dyeing hair
    Patent number: 5279618
    Abstract: A process for dyeing hair by preparing and thereafter applying to the hair an aqueous reaction medium comprising dopa and an oxidant, said aqueous reaction medium further containing at least one hair dyeing agent selected from the group consisting of primary intermediates and couplers and also containing a buffer to maintain the pH in the range from 6 to 10 during the reaction, and removing said aqueous reaction medium from the hair within about one hour following its preparation.
    Type: Grant
    Filed: July 31, 1992
    Date of Patent: January 18, 1994
    Assignee: Clairol Incorporated
    Inventors: Giuseppe Prota, Leszek Wolfram, Gottfried Wenke
  • Process and kit for dyeing hair
    Patent number: 5279617
    Abstract: A process for dyeing hair by preparing and thereafter applying to the hair an aqueous reaction medium comprising a substituted dopa species and an oxidant which is a ferricyanide salt, said aqueous reaction medium further containing a buffer to maintain the pH in the range from 6 to 10 during the reaction, and removing said aqueous reaction medium from the hair within about one hour following its preparation.
    Type: Grant
    Filed: July 13, 1992
    Date of Patent: January 18, 1994
    Assignee: Clairol Incorporated
    Inventors: Giuseppe Prota, Leszek Wolfram, Gottfried Wenke
  • Chlorites as oxidants in hair coloring
    Patent number: 5032138
    Abstract: The invention provides compositions and methods for oxidative hair dyeing utilizing a chlorite salt as the oxidizing agent.
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: July 16, 1991
    Assignee: Clairol Incorporated
    Inventors: Leszek Wolfram, Thomas Schultz, Alice Mayer, Keith Brown
  • 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