Patents by Inventor Thomas Oelschlager

Thomas Oelschlager 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).

  • Substituted 4-amino-3-nitrophenols, processes for their preparation and hair-coloring agents containing these compounds
    Patent number: 4575378
    Abstract: The invention relates to new 3-nitro-4-aminophenols of the formula (I) ##STR1## in which R denotes hydrogen or halogen, preferably chlorine or bromine, and R' denotes hydrogen or alkyl, hydroxyalkyl, dihydroxyalkyl or halogenohydroxyalkyl which has 1 to 6 carbon atoms and is straight-chain or branched, with the proviso that, if R is hydrogen, R' does not denote hydrogen, methyl or .beta.-hydroxyethyl.Processes for their preparation: (a) by reacting corresponding 3-nitro-4-aminophenols with certain halogenoalkyl chloroformates and subsequent basic treatment of the process products, or (b) by reacting corresponding 4-halogeno-3-nitrophenols with certain amines, and the intermediate products obtained and coloring agents for keratinic fibres, preferably for human hair, which contain at least one compound of the formula (I).
    Type: Grant
    Filed: January 19, 1984
    Date of Patent: March 11, 1986
    Assignee: Hans Schwarzkopf GmbH
    Inventors: Winfried Seidel, Thomas Oelschlager, Wolfgang Schlenther