Patents by Inventor Robert L. Keefe, Jr.

Robert L. Keefe, Jr. 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).

  • High strength cored cords
    Patent number: 4914902
    Abstract: Very high strength cords are made and described which are composed of a core and a sheath of twisted yarns plied around the core in such a way that the cord exhibits greatly improved retained strength after use.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: April 10, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Robert L. Keefe, Jr.