Patents by Inventor Shigefumi Fujimoto

Shigefumi Fujimoto 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).

  • Electronic switching system
    Patent number: 4150258
    Abstract: In a telephone exchange system comprising a time division exchange system and space division concentrators connected to said exchange system with a PCM lines, said concentrators are controlled by said exchange system, thus those volume of hardware in the concentrators can be considerably reduced. Said concentrator comprises a space division switching network having self-latched electronic contacts, which are controlled by a periodical drive pulse from a cyclic readout type memory.
    Type: Grant
    Filed: February 16, 1978
    Date of Patent: April 17, 1979
    Assignees: Oki Electric Industry Co., Ltd., Nippon Telegraph & Telephone Public Corp.
    Inventors: Shigefumi Fujimoto, Yasunobu Suzuki, Hiromasa Ikeda, Nobuyoshi Akiyama