Patents by Inventor Marion W. Christiansen

Marion W. Christiansen 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).

  • Heat recovery and solar assist heating system
    Patent number: 4246887
    Abstract: Heat energy is extracted from the exhaust discharged by heating devices within a house by a roof-mounted recovery unit through which the exhaust is ultimately vented in order to heat air and water circulated through the house. An additional source of heat for transfer to the air and water is derived from solar radiation collected within the recovery unit and by a separate solar heat storing unit connected thereto.
    Type: Grant
    Filed: January 12, 1978
    Date of Patent: January 27, 1981
    Inventor: Marion W. Christiansen