Patents by Inventor Donald M. Tompkins

Donald M. Tompkins 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).

  • Nonfabric engraving blanket
    Patent number: 3991673
    Abstract: An engraving blanket which comprises an engraveable layer of live resilient rubber material vulcanized at one face to a face of a base layer of nonhard, nonresilient rubber material. Talcum powder is evenly dispersed between the vulcanized faces of the two layers to control the degree of adhesion between the two. This permits selected portions of the engraveable layer to be cut out and stripped from the base layer to produce a printing design and yet provides sufficient adhesion to keep the layers together during use of the blanket.
    Type: Grant
    Filed: July 30, 1973
    Date of Patent: November 16, 1976
    Assignee: St. Regis Paper Company
    Inventors: Thomas E. Coale, Sidney W. Gunn, Frank Merrigan, Donald M. Tompkins