Patents by Inventor John Hilko

John Hilko 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).

  • Circuit breaker having members coated with phosphate-chromate protective layers
    Patent number: 3979704
    Abstract: A circuit breaker, operating in an insulating liquid dielectric environment, switchable between an open position and a closed position, is made of metallic sensing, tripping and supporting members, where a plurality of the members are coated with a dual protective film comprising a first layer containing zinc phosphate or iron phosphate about 0.00001 to about 0.0004 inch thick covered by an outside layer containing zinc chromate and/or zinc dichromate about 0.00001 to about 0.0004 inch thick, the protective film being resistant to the contacting liquid dielectric.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: September 7, 1976
    Assignee: Westinghouse Electric Corporation
    Inventors: Richard D. Buckley, John Hilko