Patents by Inventor John E. Kercheval

John E. Kercheval 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).

  • Split ring seal for cryogenic refrigerator
    Patent number: 4355519
    Abstract: A cryogenic refrigerator has a split seal at the interface between a displacer and cylinder. An expander ring presses the seal ring against the cylinder. The seal ring is also axially loaded against one face of a groove in which it is positioned. Preferred spring elements for axially loading the seal ring include a U-cross-section spring and a spring washer.
    Type: Grant
    Filed: April 20, 1981
    Date of Patent: October 26, 1982
    Assignee: Helix Technology Corporation
    Inventors: John E. Kercheval, Harry G. Nicoll