Patents by Inventor Stephen J. Zaleski

Stephen J. Zaleski 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).

  • Ground fault protection system
    Patent number: 4870527
    Abstract: A ground fault detector employs a current feedback loop which makes use of a differential current sensing configuration to in essence increase the gain of the current feedback signal, thereby lowering the detector trip level when ground fault currents are present. In a preferred embodiment, ground faults are detected in a circuit having an AC-to-AC converter and a useful load by positioning a differential sensing configuration in the DC link of the AC-to-AC converter.
    Type: Grant
    Filed: February 11, 1988
    Date of Patent: September 26, 1989
    Assignee: Emerson Electric Company
    Inventor: Stephen J. Zaleski