Patents by Inventor Roger D. Leonard

Roger D. Leonard 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).

  • Traffic light control apparatus for emergency vehicles
    Patent number: 6072406
    Abstract: A traffic light control apparatus for emergency vehicles for enabling control of a plurality of traffic signal lights disposed at a controlled intersection by an operator of an emergency vehicle and for disabling a conventional traffic signal light controller used for controlling the operation of the traffic signal lights.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: June 6, 2000
    Inventors: William H. Leonard, Roger D. Leonard
  • Traffic light control apparatus for emergency vehicles
    Patent number: 5977883
    Abstract: A new Traffic Light Control Apparatus for Emergency Vehicles for enabling control of a plurality of traffic signal lights disposed at a controlled intersection by an operator of an emergency vehicle and for disabling a conventional traffic signal light controller used for controlling the operation of the traffic signal lights.
    Type: Grant
    Filed: July 30, 1997
    Date of Patent: November 2, 1999
    Inventors: William H. Leonard, Roger D. Leonard