Patents by Inventor Herbert Lindtveit

Herbert Lindtveit 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).

  • Fuel oil filter element
    Patent number: 4952311
    Abstract: Disclosed is a replaceable fuel filter of one integral piece of extruded, compressible filter material, cut only at its ends and provided with a plurality of longitudinally extending flutes.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: August 28, 1990
    Assignee: Sid Harvey, Inc.
    Inventor: Herbert Lindtveit
  • Flue damper and draft regulator
    Patent number: 4276871
    Abstract: A flue damper and draft regulator for a furnace in which the orientation of the damper is controlled by a vane. One face of the vane is subject to external atmospheric pressure. The other face of the vane is subject to the flue pressure both upstream and downstream from the damper. Exposing the vane to the reduced pressure on the chimney side provides a force which closes the damper when the burner shuts off.
    Type: Grant
    Filed: November 13, 1979
    Date of Patent: July 7, 1981
    Assignee: Sid Harvey, Inc.
    Inventor: Herbert Lindtveit