Patents by Inventor Walter Stilz

Walter Stilz 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).

  • Bisstyrylaryl compounds
    Patent number: 4009193
    Abstract: Bisstyryl-substituted aryl compounds of the formula (I): ##STR1## where X is arylene and R.sup.1 and R.sup.5 are substituents common to the dye art. The compounds are useful as optical brighteners, particularly for acrylonitrile polymers, and give excellent whitening having good fastness properties.
    Type: Grant
    Filed: December 12, 1974
    Date of Patent: February 22, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Horst Scheuermann, Walter Stilz