Patents by Inventor Donald O. Hall

Donald O. Hall 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).

  • Gas-fired coaxial water/air vehicle heater
    Patent number: 4936505
    Abstract: An improved gas-fired heater for supplying heat to a space, such as a vehicle cab, and simultaneously, heat to the engine block for running the vehicle. A heat exchanger simultaneously heats a coolant which supplies heat to the engine block, and air to the vehicle cab.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: June 26, 1990
    Inventor: Donald O. Hall
  • Gas-fired heater means
    Patent number: 4794908
    Abstract: This invention provides improved gas-fired heater means for supplying heat to a space, such as a room, house, building, vehicle, or the like.
    Type: Grant
    Filed: January 30, 1987
    Date of Patent: January 3, 1989
    Inventor: Donald O. Hall