Patents by Inventor John P. Henschel

John P. Henschel 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).

  • Optical signal transmitter
    Patent number: 4234967
    Abstract: An optical signal transmitter for use by priority vehicles for remotely controlling traffic signals, including a light source which is flashed at a controlled repetition rate to transmit an optical signal to a receiver located at the traffic intersection. Circuitry associated with the light source includes a comparator network for disabling an electrical energy supply in the event of certain predetermined operating conditions.
    Type: Grant
    Filed: October 20, 1978
    Date of Patent: November 18, 1980
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: John P. Henschel