Patents by Inventor Francis J. Perhats

Francis J. Perhats 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).

  • Energy saving circulating system for vehicle heaters
    Patent number: 4308994
    Abstract: An improved low power drain circulating system for vehicle heaters utilizing a magnetic motor power assembly for selectively circulating hot water from the vehicle's engine to the vehicle's heater, even when the engine is shut off, and having self-contained control circuitry to further the economical power consumption of the system.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: January 5, 1982
    Assignee: Autotherm, Inc.
    Inventor: Francis J. Perhats