Patents by Inventor Preston Wallace

Preston Wallace 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).

  • Air conditioner control system
    Patent number: 4013119
    Abstract: A control system for controlling the operation of an air conditioning system having a heating mode capability, a cooling mode capability, and a common air distribution fan motor including a thermostatically operated heat switch; a thermostatically operated cool switch; a common fan motor control relay for operating the system fan motor; a cool control relay for operating the system in the cool mode energized upon closure of the cool switch; a heat control relay for operating the system in the heat mode energized upon closure of the heat switch; and, a diode network connecting the coil of the fan control relay to the cool switch and to the heat switch to energize the common fan control relay when either the heat switch or the cool switch is closed while preventing feedback from the heat control relay through the cool switch when the cool switch is closed and while preventing feedback from the cool control relay through the heat switch when said heat switch is closed.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: March 22, 1977
    Inventor: Preston A. Wallace
  • Instrument panel
    Patent number: D482305
    Type: Grant
    Filed: January 6, 2003
    Date of Patent: November 18, 2003
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Akinori Okumura, Preston Wallace, Mitsuhiro Yoshida, Daniel Sims