Patents by Inventor Kazuhiko Harazaki

Kazuhiko Harazaki 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).

  • PTC device
    Patent number: 5358793
    Abstract: A PTC device has two electrodes affixed to opposed surfaces. The electrodes consist of a metal foil having a conductive layer on their surfaces that contact the PTC material. The conductive layer has a thermal coefficient of expansion intermediate between the thermal coefficients of expansion of the metal foil and the PTC material. The intermediate value of the thermal coefficient of expansion of the conductive layer prevents peeling of the electrodes off the PTC element due to the variation of the temperature of the PTC device resulting from repeated voltage applications. In addition, improved adhesion of the electrodes to the PTC material reduces resistance changes after repeated temperature cycling.
    Type: Grant
    Filed: May 7, 1992
    Date of Patent: October 25, 1994
    Assignee: Daito Communication Apparatus Co., Ltd.
    Inventors: Toshiyuki Hanada, Mayumi Takata, Naoki Yamazaki, Isao Morooka, Kazuhiko Harazaki