Patents by Inventor Gerard R. Cleary

Gerard R. Cleary 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).

  • Electrical door interlock system and method
    Patent number: 5077631
    Abstract: A door interlock system and method are disclosed which are suitable for use for permitting electrical energization of power to components within an enclosure (11). If the door is opened, the components are de-energized. The system and method use a supply circuit breaker (5) external of the enclosure (11), and an enclosure circuit breaker (27) within the enclosure. A door sensing circuit (31) comprising an intrinsically safe barrier device senses a door of the enclosure (11) closed by door switch means (33). If the door is opened the door sensing circuit (31) opens a pilot circuit (25) which interrupts pilot circuit current and causes a pilot relay (21) to operate to trip-out the supply circuit breaker (5) thus, de-energizing the enclosure (11).
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: December 31, 1991
    Assignee: Kembla Coal & Coke Pty. Ltd.
    Inventor: Gerard R. Cleary