Patents by Inventor William A. Hansen

William A. Hansen 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).

  • Fireplace
    Patent number: 4170219
    Abstract: The invention relates to a heater which is connected to the flue of a house. The heater includes a firebox, an intermediate plenum chamber and an outer plenum chamber. Either atmospheric or ambient air is introduced into the heater and led over the heated surfaces of the two plenum chambers before issuing into the space to be heated.
    Type: Grant
    Filed: October 12, 1977
    Date of Patent: October 9, 1979
    Inventors: William A. Hansen, William A. Conly