Patents by Inventor John P. Halferty

John P. Halferty 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).

  • Arrangement for providing ground fault protection
    Patent number: 5136454
    Abstract: An arrangement for opening a circuit coupled to an electrical power source associated with a neutral circuit. The arrangement includes a bi-stable latch for electrically engaging and disengaging a pair of contacts in response to the value of the sum of currents in the circuit and the neutral circuit exceeding a predefined limit. The arrangement also includes a mechanism for opening and closing a pair of main contacts which are used to open and close the circuit. The mechanism can be operated by a shunt trip solenoid such that the solenoid causes the operating mechanism to open the contacts when the contacts of the bi-stable latch are closed.
    Type: Grant
    Filed: January 11, 1991
    Date of Patent: August 4, 1992
    Assignee: Siemens Energy & Automation, Inc.
    Inventors: John P. Halferty, William E. May