Patents by Inventor Charles E. Berr

Charles E. Berr 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).

  • Thermal stabilization of polyalkylene terephthalate resin compositions
    Patent number: 4294938
    Abstract: Polyalkylene terephthalate molding blends with ionic hydrocarbon polymers as toughening agents are protected against thermal degradation and discoloration by the presence of a selected silicone resin.
    Type: Grant
    Filed: February 15, 1980
    Date of Patent: October 13, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Charles E. Berr, Edward J. Deyrup