Patents by Inventor James E. Cartwright

James E. Cartwright 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).

  • Pressure relief filter and valve and cryopump utilizing the same
    Patent number: 4834136
    Abstract: A pressure relief valve in a cryopump is preceded by a filter element in a filter housing. The filter element is springloaded so that the filter element itself provides pressure relief with clogging of the filter. The housing may have a removable end cap. The filter is spring biased by a spring between the housing end cap and a filter end cap.
    Type: Grant
    Filed: October 5, 1987
    Date of Patent: May 30, 1989
    Assignee: Helix Technology Corporation
    Inventors: Edward L. Bourke, James E. Cartwright
  • Pressure relief filter and valve and cryopump utilizing the same
    Patent number: 4697617
    Abstract: A pressure relief valve in a cryopump is preceded by a filter element in a filter housing. The filter element is springloaded so that the filter element itself provides pressure relief with clogging of the filter. The housing may have a removable end cap. The filter is spring biased by a spring between the housing end cap and a filter end cap.
    Type: Grant
    Filed: January 22, 1985
    Date of Patent: October 6, 1987
    Assignee: Helix Technology Corporation
    Inventors: Edward L. Bourke, James E. Cartwright