Patents by Inventor Robert E. Hart

Robert E. Hart 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).

  • Plug for use with self regulating cable
    Patent number: 5252081
    Abstract: A plug for use with self-regulating cables or the like is disclosed. The plug enables simple and safe installation of a self-regulating cable or the like into the plug. It also enables an operator to connect the conductors of the plug to the cable conductors with the use of a single screwdriver and without the necessity of stripping or cutting tools. The plug ensures that all conductors are properly connected in addition to providing fuse-link protection to the circuit.
    Type: Grant
    Filed: February 4, 1993
    Date of Patent: October 12, 1993
    Assignee: Heron Cable Industries Ltd.
    Inventor: Robert E. Hart
  • Control circuitry for multistage fans
    Patent number: 4426960
    Abstract: A solid-state, multistage temperature controller for automatically controlling the operation of fans to maintain the temperature of an associated engine within preselected limits.
    Type: Grant
    Filed: August 24, 1982
    Date of Patent: January 24, 1984
    Assignee: Square D Company
    Inventor: Robert E. Hart
  • Control circuitry for multistage fans
    Patent number: 4329725
    Abstract: A solid-state, multistage temperature controller for automatically controlling the operation of fans to maintain the temperature of an associated engine within preselected limits.
    Type: Grant
    Filed: May 15, 1981
    Date of Patent: May 11, 1982
    Assignee: Square D Company
    Inventor: Robert E. Hart
  • Utility heater
    Patent number: D293711
    Type: Grant
    Filed: September 17, 1984
    Date of Patent: January 12, 1988
    Assignee: Heron Cable Industries Limited
    Inventor: Robert E. Hart