Patents by Inventor Robert E. Dempsey

Robert E. Dempsey 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).

  • Thermoforming process for polyalkylene terephthalate polyester resins
    Patent number: 4127631
    Abstract: A process for producing shaped articles of polyalkylene terephthalate resins involves thermoforming a substantially unoriented sheet of said resin which sheet has an average crystallinity thermally induced in the range of about 0% to 18% and an average temperature in the range of about 210.degree.-300.degree. F., in contact with a mold at a temperature in the range of about 240.degree.-350.degree. F. which mold is preferably at a higher temperature than said sheet. Optionally a differential in applied pressure below about 5 atmospheres can be utilized in the thermoforming.
    Type: Grant
    Filed: November 5, 1976
    Date of Patent: November 28, 1978
    Assignee: Standard Oil Company
    Inventors: Robert E. Dempsey, James L. Throne