Patents by Inventor Hiroshi Hamagawa

Hiroshi Hamagawa 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).

  • Digital time signalling device
    Patent number: 4131855
    Abstract: A digital time signalling device which includes an oscillator and frequency divider producing clock pulses at a given frequency, a counter for counting clock pulses to produce minute pulses, a counter for counting minute pulses to produce hour pulses, an hour counter for counting hours, a time setting unit and a coincidence circuit for comparing the outputs of the hour and minute counters with the output of the time setting unit to produce a coincidence signal activating a utilization device.
    Type: Grant
    Filed: August 3, 1977
    Date of Patent: December 26, 1978
    Assignee: Toyo Jihoki Manufacturing Co., Ltd.
    Inventor: Hiroshi Hamagawa