Patents by Inventor Gesine Zimmermann

Gesine Zimmermann 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).

  • 4-azo-1-phenyl-pyrazolone derivative-containing lakes as pigments
    Patent number: 5457188
    Abstract: An azo lake of the formula ##STR1## in which ##STR2## R.sup.1 =--OH or --NR.sup.4 R.sup.5, R.sup.2 = ##STR3## except the lake of the formula ##STR4## Such azo lakes are useful as pigments.
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: October 10, 1995
    Assignee: Bayer Aktiengesellschaft
    Inventor: Gesine Zimmermann