Patents by Inventor Shoich Sugaya

Shoich Sugaya 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).

  • Method of making a positive temperature coefficient device
    Patent number: 5241741
    Abstract: A positive temperature coefficient ("PTC") device body is formed by compression molding of an organic PTC composition consisting of a crystalline polymer with conductive particles dispersed therein. The body is sandwiched between electrodes to which terminals are attached by spot welding or soldering. The PTC device body is aged at normal pressure and at a temperature higher than the peak resistance temperature, that is, the temperature at which its resistance is a maximum, and lower than 250.degree. C. The resistance of the PTC device does not change either before or after exposure to high temperatures, that is, temperatures substantially greater than 250.degree. C., and the PTC characteristics of the device do not decrease despite aging. Therefore PTC devices made according to the present invention can be surface-mounted.
    Type: Grant
    Filed: July 10, 1992
    Date of Patent: September 7, 1993
    Assignee: Daito Communication Apparatus Co., Ltd.
    Inventor: Shoich Sugaya