Patents by Inventor Gary F. Christiansen

Gary F. Christiansen 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).

  • Patent number: 4251693
    Abstract: A hook switch flash generator to provide consistent, electronically controlled and timed flash signals independent of human variables. A user operated button switch is closed to initiate transmission of a predetermined duration pulse recognizable by the central office system or PBX as a hook switch flash.
    Type: Grant
    Filed: August 3, 1978
    Date of Patent: February 17, 1981
    Inventor: Gary F. Christiansen