Patents by Inventor Gerd Ziegast

Gerd Ziegast 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).

  • Poly-dicaboxylic acid anhydrides, their production and use
    Patent number: 5091565
    Abstract: New poly-dicarboxylic acid anhydrides, which are suitable as bio-degradable matrix materials for the controlled release of medicinal agents in humans.
    Type: Grant
    Filed: August 21, 1990
    Date of Patent: February 25, 1992
    Assignee: Sandoz Ltd.
    Inventor: Gerd Ziegast
  • Poly-dicaboxylic acid anhydrides and polymeric anhydrides therefrom
    Patent number: 4792598
    Abstract: New poly-dicarboxylic acid anhydrides, which are suitable as bio-degradable matrix materials for the controlled release of medicinal agents in humans. The anhydrides have the following formula: ##STR1## where ##STR2## where n=an integer of two or more, for the first three radicals, or one or more for the fourth.
    Type: Grant
    Filed: September 29, 1986
    Date of Patent: December 20, 1988
    Assignee: Sandoz Ltd.
    Inventor: Gerd Ziegast