Patents by Inventor John D. McGraw

John D. McGraw 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).

  • Induction ventilation system
    Patent number: 4100964
    Abstract: An induction ventilation system for one or more zones. For each zone, the system includes a heat exchanger, a means for driving a heating or cooling liquid through the heat exchanger, an adjustable flow rate primary air injector and a secondary air induction inlet, and a zone temperature control. The temperature control is selectively operative to control the injector to vary the flow rate of primary air in response to sensed temperature in the zone. The temperature control is further selectively operative to maintain the flow rate of the heating or cooling liquid to be relatively constant in one form of the invention, or to vary in response to sensed temperature in the zone in another form of the invention.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: July 18, 1978
    Assignee: Mitco Corporation
    Inventors: Dimiter Gorchev, John D. McGraw