Patents by Inventor Robert F. Keefe

Robert F. Keefe 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).

  • Tactile tile
    Patent number: 5328293
    Abstract: A tactile tile having a flat plate with a plurality of raised areas, said plate and raised areas comprised of polyurethane.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: July 12, 1994
    Assignee: Keefe-Dickson Corporation Inc.
    Inventor: Robert F. Keefe