Patents by Inventor David J. Heritage

David J. Heritage 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).

  • Control system for gas fired heating apparatus using radiant heat sense
    Patent number: 5169301
    Abstract: A control system for a gas fired, direct ignition, induced draft furnace includes a radiant heat sensing switch responsive to a hot surface igniter and burner flame, a single-pole, double-throw pressure switch responsive to fluid flow effected by the inducer, and a plurality of relays responsive to the radiant heat sensing switch, the pressure switch, and various other connected switching means.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: December 8, 1992
    Assignee: Emerson Electric Co.
    Inventors: Donald E. Donnelly, John S. Haefner, David J. Heritage