Patents by Inventor John S. Dour

John S. Dour 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).

  • Ultrasonic vehicle alarm system
    Patent number: 4125826
    Abstract: An alarm system utilizing a vehicle transmitter of pulsed ultrasonic energy directed to a stationary receiver outside the vehicle and which renders an alarm if the receiver does not receive ultrasonic energy of a given frequency for a preset time period. The vehicle transmitter is disabled in response to an intruder alarm in the vehicle detecting the presence of an intruder. The receiver alarm thus is activated either by the presence of an intruder or by the vehicle being moved a sufficient distance from the receiver.
    Type: Grant
    Filed: January 5, 1977
    Date of Patent: November 14, 1978
    Inventors: Fred M. Rasmussen, John S. Dour