Patents by Inventor Henry W. Gventer

Henry W. Gventer 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).

  • Light-sensitive composition comprising phthalic anhydride
    Patent number: 4307173
    Abstract: Disclosed is an improved photosensitive composition having increased light sensitivity. Said composition comprises an O-quinone diazide, phthalic anhydride and an aromatic sulfonic acid.
    Type: Grant
    Filed: February 12, 1981
    Date of Patent: December 22, 1981
    Assignee: American Hoechst Corporation
    Inventor: Henry W. Gventer