Patents by Inventor William F. Schell

William F. Schell 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).

  • Communication signal device
    Patent number: 5367296
    Abstract: The present invention relates to a communication signal device. The communication signal device is mounted on a boat and contains a radio, a light beacon, and an emergency position indicating radio beacon.
    Type: Grant
    Filed: February 18, 1993
    Date of Patent: November 22, 1994
    Inventor: William F. Schell
  • Probe-actuated guard shield switch
    Patent number: 4389551
    Abstract: A probe-actuated guard-shield switch mechanism automatically disconnects a guard shield to an input terminal of a measurement instrument upon insertion of a guard probe, and reconnects the guard shield upon removal of the guard probe. The mechanism provides a break-before-make connection sequence for safety reasons, and also provides a non-conductive safety gate to minimize shock hazard.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: June 21, 1983
    Assignee: Tektronix, Inc.
    Inventors: Florian C. Deibele, William F. Schell