Patents by Inventor Hans-Dieter Schweiger

Hans-Dieter Schweiger 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).

  • 11H,12H-[1]benzopyrano[2,3-b][1]benzopyran-11,12-dione and derivatives
    Patent number: 3978081
    Abstract: Benzopyrano-benzopyranes and the sulfur analogs thereof, benzothiopyranobenzothiopyranes, useful as medicinal agents. Compositions of matter including 11H,12H-[1]benzopyrano[2,3-b][1]benzopyran-11,12-dione or 11H,12H-[1]benzothiopyrano[2,3-b][1]benzothiopyran-11,12-dione, and derivatives thereof including acid addition salts.
    Type: Grant
    Filed: March 12, 1975
    Date of Patent: August 31, 1976
    Assignee: Chem. pharmaz. Fabrik Dr. Hermann Thiemann GmbH
    Inventors: Fritz Eiden, Hans-Dieter Schweiger