Patents by Inventor Hans Schlapfer, deceased

Hans Schlapfer, deceased 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).

  • 3-Phenyl-7-(v-triazol-2-yl)-coumarins
    Patent number: 4141900
    Abstract: Novel 3-phenyl-7-(v-triazol-2-yl)-coumarins of the formula ##STR1## wherein R represents hydrogen, unsubstituted or substituted alkyl, alkenyl, alkanyol, aroyl, aralkyl, alkoxycarbonyl, carbamoyl or v-epoxyalkyl, the rings A, B and C being optionally substituted with further non-chromophoric substituents, processes for their preparation as well as a process for optically brightening organic material on using said compounds are disclosed.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: February 27, 1979
    Assignee: Ciba-Geigy Corporation
    Inventor: Hans Schlapfer, deceased