Patents by Inventor Yuzo Oishi

Yuzo Oishi 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).

  • Patent number: 6400969
    Abstract: Communication equipment that is provided with an isolating switch, which is operated by placement of a handset, instead of a conventionally used insulating component. The isolating switch constitutes an electrical insulation between a charging, terminal of a base unit and an external electric circuit. This structure eliminates the necessity of providing an insulating component such as a transformer and the like, so as to achieve a cost reduction of the communication equipment, and also improves sound quality of the communication equipment. In addition, the isolating switch is arranged in Such a manner that a direction of tile force applied by the handset to depress the terminal of the base unit and a direction of the force applied by the handset to depress a switch level are separated from each other. The isolating switch has a construction that enables the switch lever to function with a small loading weight, and to keep a contact point of the switch depressed by an intense force.
    Type: Grant
    Filed: April 27, 1999
    Date of Patent: June 4, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Atsushi Yamashita, Shinya Kinoshita, Yuzo Oishi, Takashi Kamiya, Hiroshi Nishiyama, Yoshihiro Nishikawa, Toru Sakata