Patents by Inventor Robert H. Pintell

Robert H. Pintell 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).

  • Patent number: 4068276
    Abstract: An a-c power supply for a load such as a household appliance, including a line wire, a neutral wire and a ground wire, has a safety switch and an overload-sensing resistor inserted in its line wire and also comprises a ground-fault detector in the form of a differential transformer with a toroidal core traversed by the line and neutral wires. The safety switch, which may be a manually resettable circuit breaker or an armature of a self-locking relay, has an operating winding in series with an SCR connected between a positive and a negative terminal, one terminal being connected via respective diodes to the line and neutral wires, the other terminal being connected via respective diodes to the neutral and ground wires.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: January 10, 1978
    Assignee: Interelectronics Corporation
    Inventor: Robert H. Pintell
  • Patent number: D263297
    Type: Grant
    Filed: May 31, 1979
    Date of Patent: March 9, 1982
    Assignee: Interelectronics Corporation
    Inventor: Robert H. Pintell