Patents by Inventor Wolf-Dieter Wirth

Wolf-Dieter Wirth 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).

  • Triazolyl-coumarins
    Patent number: 4005098
    Abstract: Triazolyl-coumarins of the formula ##STR1## wherein R.sub.1 to R.sub.4 and X are as defined herein, or their quaternization products are useful as brightening agents.
    Type: Grant
    Filed: March 12, 1969
    Date of Patent: January 25, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Alfons Dorlars, Carl-Wolfgang Schellhammer, Wolf-Dieter Wirth