Patents by Inventor Harold N. Silvers

Harold N. Silvers 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).

  • Process for preparing polycarbonates
    Patent number: 4131731
    Abstract: A process for preparing linear polycarbonates containing terminal hydroxyl groups with the essential exclusion of other terminal groups by reacting glycols having a carbon number > 4 and cyclic esters of carbonic acid via ester interchange reaction at 100-300.degree. C and 0.1 - 300 mm Hg.
    Type: Grant
    Filed: January 9, 1978
    Date of Patent: December 26, 1978
    Assignee: Beatrice Foods Company
    Inventors: Kwo-Hrong Lai, Harold N. Silvers