Patents by Inventor Geoffrey Humberstone

Geoffrey Humberstone 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).

  • Rotating magnetron incorporating a removable cathode
    Patent number: 5100527
    Abstract: A rotatable magnetron having a cathode and a bearing assembly wherein the cathode may be removed from a coating chamber while the bearing assembly remains in place.
    Type: Grant
    Filed: October 18, 1990
    Date of Patent: March 31, 1992
    Assignee: Viratec Thin Films, Inc.
    Inventors: David E. Stevenson, Erik J. Bjornard, Geoffrey Humberstone