Patents by Inventor Frederick L. Sanford

Frederick L. Sanford 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).

  • Low density particles of polyphenylene ether resins
    Patent number: 4727093
    Abstract: Low density particles or beads of polyphenylene ether or polyphenylene ether-polystyrene blends are provided by incorporation of a suitable blowing agent such as pentane into the resin mixture, flowed by expansion of the resin particles by exposure temperatures near the Tg of the blend.
    Type: Grant
    Filed: October 27, 1986
    Date of Patent: February 23, 1988
    Assignee: General Electric Company
    Inventors: Richard B. Allen, Frederick L. Sanford