Patents by Inventor Hironobu Oshikata

Hironobu Oshikata 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).

  • Key telephone system
    Patent number: 5025441
    Abstract: A key telephone system for use in PCM telecommunications includes an office line communication units, an extension interface unit, a receiving unit, an extension communication unit, and an information transmitting and receiving unit.
    Type: Grant
    Filed: December 28, 1988
    Date of Patent: June 18, 1991
    Assignee: Iwatsu Electric Company, Ltd.
    Inventors: Masaharu Kamigaki, Hironobu Oshikata, Yoshihiro Kawata, Nobuyasu Shiga, Hideharu Omori, Masayuki Kawashima, Toshimichi Shimatani
  • Key telephone system
    Patent number: 4782514
    Abstract: A key telephone system comprising a key service unit and key telephone sets is configured by the present invention so that system data are registered in an IC card and the system data so registered are fed to the key service unit by the insertion of the IC card in the key service unit.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: November 1, 1988
    Assignee: Iwatsu Electric Co., Ltd.
    Inventors: Hironobu Oshikata, Hiroshi Fukushima, Teruo Matsufuji