Patents by Inventor Toyokazu Hashimoto

Toyokazu Hashimoto 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).

  • Data transmission system adapted to facilitate detection of safe receipt of a transmitted data frame by a receiving station
    Patent number: 4558428
    Abstract: This invention relates to a loop transmission system which has a plurality of stations connected to a loop transmission path to transmit data among the stations. In the transmission frame to be sent out from the sending station, specific information is included for identifying each frame and this information is held in the sending station. When the transmission frame returns to the sending station after being transmitted through the loop transmission path, the specific information in the frame is received and compared with the information held in the station and, if they coincide, it is decided that the transmission frame has been correctly received by the intended receiving station.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: December 10, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Hisashi Matsumura, Toyokazu Hashimoto, Masahiko Kida, Hiroyuki Wada
  • Method and apparatus for switching loop type transmission lines
    Patent number: 4506357
    Abstract: A method of switching transmission lines for a transmission control system in which a plurality of stations are linked with loop type transmission lines having a stand-by transmission line characterized in that each of the stations is operable to switch the active transmission line to the stand-by transmission line in response to the detection of abnormality in the carrier wave and a station transmitting the carrier wave is operable to halt the transmission of the carrier wave on the active transmission line so that the overall transmission line is switched to the stand-by transmission line, thereby minimizing the system down time.
    Type: Grant
    Filed: March 19, 1982
    Date of Patent: March 19, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Susumu Nakayashiki, Masahiko Kida, Toyokazu Hashimoto
  • Method and system of loop transmission
    Patent number: 4495595
    Abstract: In a loop transmission system utilizing specific patterns, a specified station for sending the specific patterns sends a specific pattern S or a specific frame S' which is not delayed in each station in advance of sending a specific pattern G used for data exchanging in each station, thereby ensuring rapid detection of abnormality of the specific pattern G.
    Type: Grant
    Filed: April 1, 1982
    Date of Patent: January 22, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Susumu Nakayashiki, Isao Nakada, Masahiko Kida, Toyokazu Hashimoto, Kazuo Yagyu
  • Loop transmission system
    Patent number: 4435704
    Abstract: A loop transmission system including a plurality of stations connected in series in a looped transmission line to transfer data among the stations, wherein the stations include a supervising station and at least one terminal station and the transmission line is duplicated so that when a fault occurs in currently used one of the transmission lines, the other transmission line which has been used as a spare is used for transmission of data, while the supervising station sends out a specific signal to the spare transmission line and the terminal stations each determines one of the transmission lines through which the specific signal is detected, as the spare.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: March 6, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Toyokazu Hashimoto, Hiroyuki Wada, Masahiko Kida, Hisashi Matsumura, Susumu Nakayashiki
  • Data transmission system adapted to facilitate detection of safe receipt of a transmitted data frame by a receiving station
    Patent number: RE33181
    Abstract: This invention relates to a loop transmission system which has a plurality of stations connected to a loop transmission path to transmit data among the stations. In the transmission frame to be sent out from the sending station, specific information is included for identifying each frame and this information is held in the sending station. When the transmission frame returns to the sending station after being transmitted through the loop transmission path, the specific information in the frame is received and compared with the information held in the station and, if they coincide, it is decided that the transmission frame has been correctly received by the intended receiving station.
    Type: Grant
    Filed: December 10, 1987
    Date of Patent: March 13, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Hisashi Matsumura, Toyokazu Hashimoto, Masahiko Kida, Hiroyuki Wada