Patents by Inventor Mitsuhiro Hamatani

Mitsuhiro Hamatani 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).

  • Electric circuit for driving a piezoelectric vibrator
    Patent number: 4232241
    Abstract: A diode and a coil are connected in series to the output side of a driving circuit switched ON and OFF upon receipt of a pulse signal and a piezoelectric vibrator is connected in parallel with the series-connected diode and coil. The piezoelectric vibrator is driven by a reverse induced voltage produced in the coil when the driving circuit is switched OFF so as to apply more electric energy for driving the piezoelectric vibrator than would be the case if the diode were omitted.
    Type: Grant
    Filed: May 24, 1978
    Date of Patent: November 4, 1980
    Assignee: Kabushiki Kaisha Seikosha
    Inventor: Mitsuhiro Hamatani