Patents by Inventor James Rick Stewart

James Rick Stewart 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).

  • Patent number: 7178588
    Abstract: An improved cup and method for making same for use on a “pig” or any other down hole equipment for engaging the wall of a pipe line, which comprises an inner metal sleeve portion; a metal shoulder portion extending outward from the sleeve around its perimeter extending into an angulated arm portion; a strong flexible material, such as polyurethane, molded onto an outer surface of the sleeve, and enveloping the metal shoulder and arm portion, the flexible material defining the outer body and cup portion of the improved cup, so that the metal shoulder and arm portion enveloped by and integral to the cup portion provides additional support to the flexible material to prevent deformation of other damage to the circular cup as it would be positioned on the “pig” body or other down hole device.
    Type: Grant
    Filed: May 10, 2004
    Date of Patent: February 20, 2007
    Inventors: Tom Harper, James Rick Stewart, David Hutchinson, Terry DeRoche, Jr., Larry J. Kirepel