Patents by Inventor Yoshinori Bekki

Yoshinori Bekki 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).

  • Patent number: 5101405
    Abstract: A line concentrator used in a ring network system which has line concentrators for accommodating ring lobes, and a ring trunk cable connecting adjacent line concentrators, wherein a signal transmitted from an upstream line concentrator is sent via the ring trunk cable to the ring lobes of an immediately downstream line concentrator. The line concentrator is provided with a circuit for regenerating a signal on the ring trunk cable received by the line concentrator, and repeating and sending the regenerated signal to the ring lobes.
    Type: Grant
    Filed: September 30, 1988
    Date of Patent: March 31, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Yoshinori Bekki, Hiroyuki Wada
  • Patent number: 5046185
    Abstract: A regenerative repeater for regeneratively repeating a signal to be transmitted is inserted in two ring-like transmission lines, and is provided with loop back means for automatically separating the regenerative repeater from the ring-like transmission lines in the condition that a power supply is in a not-yet-turned-on state, so that closed ring-like transmission lines are formed in the form where the regenerative repeater is removed in the condition that the power supply is in the not-yet-turned-on state.
    Type: Grant
    Filed: July 28, 1989
    Date of Patent: September 3, 1991
    Assignees: Hitachi, Ltd., Hitachi Computer Electronic Co., Ltd.
    Inventors: Masato Hirai, Yoshinori Bekki, Sinzi Ikezawa, Teruo Moriguchi
  • Patent number: 4937823
    Abstract: In a ring network system including two transmission lines transmitting a signal in directions opposite to each other, and a plurality of line concentrators connected in the form of a loop by the two transmission lines and each accommodating a plurality of terminal stations connected to one of the two transmission lines, a signal detecting unit and a terminating circuit are disposed in each of the line concentrators on the signal output side of each of the transmission lines so as to be connectable to and disconnectable from the transmission lines, so that, when the signal detecting unit in one of the line concentrators is connected to the associated transmission line, the transmission line is disconnected in the line concentrator, and the terminating circuit is connected to the downstream segment of the disconnected transmission line.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: June 26, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Yoshinori Bekki, Hiroyuki Wada, Masato Hirai
  • Patent number: 4899142
    Abstract: A ring network system in which a plurality of line concentrators each having terminal stations connected thereto through respective branch lines are interconnected through at least one ring transmission lines. Each line concentrator includes configuration control switches capable of disconnecting from the ring transmission line all the branch lines placed under control of the line concentrator while holding the ring transmission line in the state to allow communication. The branch line(s) disconnected from the ring transmission line form(s) a local ring through cooperation with an internal transmission line. The line concentrator detected abnormality of communication or the line concentrator to be set to the rest state can undergo internal diagnosis operation or continue to be in the rest state without disturbing the communication among other line concentrators.
    Type: Grant
    Filed: May 4, 1987
    Date of Patent: February 6, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Susumu Nakayashiki, Jiro Kashio, Takeshi Harakawa, Yoshinori Bekki, Mitsuhiro Yamaga
  • Patent number: 4847611
    Abstract: In a ring communications system including a plurality of line concentrators that are connected in the form of a ring, the line concentrators are connected together via a main ring, and the terminal stations connected to the line concentrators are connected to the main ring via ring subsidiaries. The main ring and the ring subsidiaries are connected together via ring connection switches that so work as to connect or disconnect the main ring and the ring subsidiaries. The ring connection switch is so constructed as to maintain the connected condition even when the power source of the line concentrator is in the turned-off state.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: July 11, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Yoshinori Bekki, Hiroyuki Wada, Mitsuhiro Yamaga, Susumu Nakayashiki
  • Patent number: 4777330
    Abstract: A station diagnosis method in a communications network system including a closed ring transmission line and a plurality of data stations which can be connected to the ring transmission line by a plurality of line concentrators disposed in the ring transmission line wherein an internal ring transmission line is formed in the line concentrators so that the operation states of the line concentrators are diagnosed by transmitting diagnosis data through the internal ring transmission line.
    Type: Grant
    Filed: October 1, 1987
    Date of Patent: October 11, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Susumu Nakayashiki, Takeshi Harakawa, Yoshinori Bekki, Hiroyuki Wada, Masahiro Fuse, Hiroshi Nakase, Osamu Ebina, Jiro Kashio