Patents by Inventor David R. Walbridge

David R. Walbridge 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).

  • Color proof with non-blocking thermal adhesive layer with particulate polymer beads
    Patent number: 4885225
    Abstract: Particulate organic polymeric beads in the thermal adhesive layer of prepress color proofing elements prevents adhesive blocking without optical interference or reduction in adhesive performance.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: December 5, 1989
    Assignee: Minnesota Mining and Manufacturing Company
    Inventors: Michael B. Heller, Leonard W. Sachi, David R. Walbridge