Patents by Inventor Katsuhisa Seki

Katsuhisa Seki 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).

  • System for operating fire prevention devices
    Patent number: 3979648
    Abstract: The system for operating fire prevention devices comprises a plurality of fire prevention device operators successively operated directly or through another already operated operator in response to the operation of one of the fire detectors. Each of the operators includes switch means for switching the circuit from one operator to another when the fire prevention device associated therewith completes its operation. The switch means also function to switch the circuit upon the failure of the fire prevention device within a predetermined time.
    Type: Grant
    Filed: March 10, 1975
    Date of Patent: September 7, 1976
    Assignee: Nohmi Bosai Kogyo Co., Ltd.
    Inventors: Shigeru Toyoshima, Mamoru Honda, Katsuya Nakamura, Katsuhisa Seki