Patents by Inventor Richard L. Tennis

Richard L. Tennis 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).

  • Hydraulic cylinder piston seal
    Patent number: 6502826
    Abstract: A piston seal for sealing a high pressure hydraulic cylinder includes a rigid seal ring, an elastomeric energizer ring, and a mask structure. The mask structure is effective in decreasing explosive decompression of air entrapped under the surface of the elastomeric energizer ring that causes pitting and deterioration of the elastomer of the energizer ring by masking the energizer ring material from harmful ingress and egress of air.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: January 7, 2003
    Assignee: Caterpillar Inc
    Inventors: Jeffrey A. Schroeder, Richard L. Tennis