Patents by Inventor Uwe Kobs

Uwe Kobs 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 diaminophenols, process for their preparation, and hair dyes containing such compounds
    Patent number: 5990355
    Abstract: Compounds of the formula (I) and their salts with inorganic and organic acids, ##STR1## in which R.sub.1 is a hydrogen atom or a trimethylsilyl group, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 are, independently of each other, a hydrogen atom, a (C.sub.1 -C.sub.4) alkyl group, a hydroxy-(C.sub.2 -C.sub.3) alkyl group, an alkoxy-(C.sub.2 -C.sub.3) group, an amino-(C.sub.2 -C.sub.3) group, or a 2,3-dihydroxypropyl group, and in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are not simultaneously hydrogen atoms, and processes for their preparation and use as hair-coloring agents.
    Type: Grant
    Filed: October 3, 1997
    Date of Patent: November 23, 1999
    Assignee: Hans Schwarzkopf GmbH & Co. KG.
    Inventors: Mustafa Akram, Wolfgang Wolff, Andreas Bittner, Uwe Kobs
  • Substituted diaminophenols, and hair dyes containing such compounds
    Patent number: 5676706
    Abstract: Compounds of the formula (I) and their salts with inorganic and organic acids, ##STR1## in which R.sub.1 is a hydrogen atom or a trimethylsilyl group, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 are, independently of each other, a hydrogen atom, a (C.sub.1 -C.sub.4) alkyl group, a hydroxy-(C.sub.2 -C.sub.3) alkyl group, an alkoxy-(C.sub.2 -C.sub.3) group, an amino-(C.sub.2 -C.sub.3) group, or a 2,3-dihydroxypropyl group, and in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are not simultaneously hydrogen atoms, and processes for their preparation and use as hair-coloring agents.
    Type: Grant
    Filed: October 25, 1995
    Date of Patent: October 14, 1997
    Inventors: Mustafa Akram, Wolfgang Wolff, Andreas Bittner, Uwe Kobs