Patents by Inventor Tohru Kazawa

Tohru Kazawa 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 and system for bidirectionally transmitting data
    Patent number: 4841521
    Abstract: A method and a system for bidirectional transmission/reception of data between two terminal stations, in which each transmission period is divided into a plurality of first time sections for relatively low speed data transmission and at least one second time section for relatively high speed data transmission, the direction of transmission between the terminal stations being predetermined in each of the first time sections, while the direction of transmission between the terminal stations is reversible in each of the second time sections, each second time section being preceded by one of the first time sections. Transmission of information data and control data is performed from one to the other terminal station in a predetermined direction in each first time section, and the direction of data transmission between the terminal stations in the next second time section is determined on the basis of control data contained in the relatively low speed data transmission.
    Type: Grant
    Filed: May 28, 1987
    Date of Patent: June 20, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Eiichi Amada, Hirotoshi Shirasu, Hiroshi Takatori, Tohru Kazawa, Toshiro Suzuki, Takanori Miyamoto, Tatsuya Kameyama