Patents by Inventor Christopher J. Biermann

Christopher J. Biermann 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).

  • Biodegradable graft copolymers
    Patent number: 4891404
    Abstract: A nucleophilic displacement reaction is used to prepare biodegradable thermoplastic copolymers exhibiting a high capacity for stabilizing biodegradable blends of polysaccharides and synthetic thermoplastic polymers. The graft copolymers are characterized by consistent product uniformity and a high degree of substitution on the polysaccharide chain.
    Type: Grant
    Filed: May 27, 1988
    Date of Patent: January 2, 1990
    Assignee: Purdue Research Foundation
    Inventors: Ramani Narayan, George T. Tsao, Christopher J. Biermann