Patents by Inventor Hiroshi Nariai

Hiroshi Nariai 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).

  • Small piezoelectric tuning fork
    Patent number: 4297610
    Abstract: A tuning fork-type quartz vibrator having leg members of a length of below six millimeters and a thickness/width ratio below one reveals the zero temperature coefficient at temperatures appearing within a wrist watch carried by a human body. The vibrator also has a favorable low series resonant impedance.
    Type: Grant
    Filed: September 6, 1977
    Date of Patent: October 27, 1981
    Inventors: Kunimoto Ito, Tsutomu Kakizawa, Kengo Yonetani, Hiroshi Nariai