Patents by Inventor Tetsuji Isogai

Tetsuji Isogai 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).

  • Mobile telecommunications system using distributed miniature zones
    Patent number: 5058201
    Abstract: A mobile telecommuncations system has multiple base stations each defining a miniature service zone and capable of communicating with mobile stations present in the service zone over a radio link. Geographically associated ones of the base stations are spaced apart from each other by an area which is not responsive to electromagnetic waves on the radio links, whereby the base stations are allowed to share the same frequency for the electromagnetic waves. The base stations are interconnected to an on-road vehicle telecommunications network which switches communications to the base stations.
    Type: Grant
    Filed: May 24, 1989
    Date of Patent: October 15, 1991
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Yasuhiro Ishii, Tetsuji Isogai, Tatsuhiko Okazaki, Fumikazu Sato, Hiroto Yoneyama, Yukio Inotsume, Toshiyuki Kodama