Patents by Inventor Richard D. Sheehan

Richard D. Sheehan 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).

  • Skateboard ramp
    Patent number: D257874
    Type: Grant
    Filed: September 13, 1978
    Date of Patent: January 13, 1981
    Assignee: R. J. Louis Enterprises, Inc.
    Inventors: Richard D. Sheehan, R. J. Louis