Patents by Inventor Fred Dibert

Fred Dibert 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).

  • Spark plug construction with temperature responsive ground wires
    Patent number: 4906889
    Abstract: A spark plug having a metal shell accommodating a dielectric core through which an electrode extends and terminates at one end in a tip spaced by a spark gap from an overlying ground wire that is bent between its ends and joined to the shell. That surface of the ground wire which confronts the electrode is grooved to enlarge its area and enable the wire to react like a bimetallic element in response to changes in its temperature and vary the size of the spark gap.
    Type: Grant
    Filed: June 20, 1988
    Date of Patent: March 6, 1990
    Inventor: Fred Dibert
  • Ventilating apparatus for heat transfer systems
    Patent number: 3982560
    Abstract: Apparatus for introducing fresh, outside air to a forced air heating or cooling system of buildings comprising a conduit for conducting fresh air to the system, a damper movably mounted in the conduit for adjusting the flow of fresh air therein, and a counterweight adjustably mounted on the damper inside the conduit for movement to selected counterbalancing positions.
    Type: Grant
    Filed: May 13, 1974
    Date of Patent: September 28, 1976
    Inventor: Fred Dibert
  • Spherical compass
    Patent number: D310040
    Type: Grant
    Filed: January 11, 1988
    Date of Patent: August 21, 1990
    Assignee: Lillian J. Dibert
    Inventor: Fred Dibert