Patents by Inventor Masumi Nawa

Masumi Nawa 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).

  • Symmetry type loop communication system
    Patent number: 4517644
    Abstract: A symmetric type loop communication system having no master station, in which a plurality of control stations connected to a loop communication path each have a timer with its set time different from each other control station. The timer of a station is reset when a transmission right signal (GA signal) from another control station is received. On the other hand, a GA signal is sent out to another control station together with a message frame when the timer thereof has counted to a predetermined state.
    Type: Grant
    Filed: August 24, 1981
    Date of Patent: May 14, 1985
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Nobuhiro Hamada, Norihiko Sugimoto, Masumi Nawa