Patents by Inventor Ben F. Doerksen

Ben F. Doerksen 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: 4816802
    Abstract: A tire pressure monitoring system for a tractor-trailer type vehicle includes a series of sensors on each of the wheels of the vehicle. When a low pressure condition occurs, the sensor activates a radio frequency transmitter for delivering a low power FM signal to a receiver on the tractor. A delay circuit is incorporated in the receiver to require that the signal from the transmitter last for a predetermined duration prior to energizing an indicator in the tractor. The receiver antenna is preferably mounted on the bottom of the tractor in a plane including the trailer wheels.
    Type: Grant
    Filed: April 18, 1985
    Date of Patent: March 28, 1989
    Assignee: Ben F. Doerksen
    Inventors: Ben F. Doerksen, Donald M. Nattinger