Patents by Inventor Isolde Loewe

Isolde Loewe 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).

  • Oxidation hair dye composition based on 4,5-diaminopyrazole and m-phenylenediamine derivatives
    Patent number: 5718731
    Abstract: The oxidation hair dye composition contains from 0.01 to 4.0 percent by weight of a developer substance including at least one diaminopyrazole of the formula (I) ##STR1## wherein R.sup.1 is selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 carbon atoms, a hydroxyalkyl group having from 2 to 4 carbon atoms and a substituted or unsubstituted benzyl group, and R.sup.2 and R.sup.3, independently, are each selected from the group consisting of hydrogen, an alkyl group having from 1 to 6 carbon atoms and a hydroxyalkyl group having from 2 to 4 carbon atoms; and from 0.01 to 4.0 percent by weight of a coupler substance including at least one m-phenylenediamine selected from the group consisting of N-(3-dimethylamino)phenyl urea and 3-(N-methylsulfonyl)amino-N,N-dimethylaniline.
    Type: Grant
    Filed: August 13, 1996
    Date of Patent: February 17, 1998
    Assignee: Wella Aktiengesellschaft
    Inventors: Isolde Loewe, Alexa Weinges, Wolfgang R. Balzer, Stefan Gerstung