Patents by Inventor David J. Hobson

David J. Hobson 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).

  • Valve having rotatable cage
    Patent number: 5335692
    Abstract: A valve has an on-off control member disposed about an independently rotatable dynamic control member. The on-off control member, which interfaces with a sealing means, may be rotated to a closed position for shutoff purposes. Throttling operation is achieved by rotating the dynamic control member with the on-off control member in a stationary, fully open position which protects the sealing means. Bearings are placed between the dynamic control member and the on-off control member to permit the dynamic control member to rotate freely and accurately.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: August 9, 1994
    Assignee: Xomox Corporation
    Inventors: David J. Hobson, Everett DeJager