Patents by Inventor Donald M. Corgan

Donald M. Corgan 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: 4263579
    Abstract: An electrical tire pressure alarm circuit includes an actuating connection to the vehicle storage battery which is keyed through a normally open disabling switch. The switch may be controlled by the vehicle ignition, by a trailer coupling, or it may be manually actuated. The transmitter is located on the vehicle wheel and responds to low tire pressure with a fixed frequency radio signal from a nominal input power less than 20 milliwatts. The transmitter oscillator is a tuned inductance/capacitance transistor oscillator circuit. An electromagnetic relay coil positioned on the vehicle frame closes an enabling switch to the transmitter only when the transmitter has been rotated by the wheel to a position proximate thereto, and only when the disabling switch has been closed. An alarm indicating system is located in the vehicle cab and is wired to the receiver and powered by the vehicle storage battery.
    Type: Grant
    Filed: November 15, 1979
    Date of Patent: April 21, 1981
    Assignee: CGS Research and Development, Inc.
    Inventors: Donald M. Corgan, Raymond L. Grimes