Patents by Inventor Walter E. Folkerts

Walter E. Folkerts 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).

  • Control for furnace flue damper
    Patent number: 4264296
    Abstract: A pivotal vane carrying member secured to the damper for a furnace flue normally maintains the damper by gravity in an open position. An electric motor driven air blower discharges air against the vanes of the pivotal member to pivot the latter and damper to a closed position when no fuel is supplied to the furnace. Otherwise power for the blower motor is shut off and the pivotal member returns by gravity to its normal flue-open position.
    Type: Grant
    Filed: May 24, 1979
    Date of Patent: April 28, 1981
    Inventor: Walter E. Folkerts