Patents by Inventor Katsuyoshi Onishi

Katsuyoshi Onishi 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: 5224096
    Abstract: A frame strip method for a bridge circuit for transparently forwarding data between a plurality of LANs (Local Area Network) without frame infinite circulation. The numbers of transmission/receive frames are counted. In counting the number, the validity/invalidity of a transmission frame is judged in accordance with the kind of the transmission frame. The validity/invalidity and strip/receive of a receive frame are judged in accordance with the kind of the receive frame. In accordance with the numbers of valid transmission/receive frames, a receive frame is stripped from the transmission line if the condition of (transmission frame number)>(receive frame number) is met.
    Type: Grant
    Filed: September 17, 1990
    Date of Patent: June 29, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Katsuyoshi Onishi, Koichi Kimura, Mitsuhiro Yamaga, Osamu Takada, Masahito Sasaki
  • Patent number: 5220562
    Abstract: Frontend LANs connecting plural stations are connected to plural nodes of a backbone LAN respectively. The backbone LAN is constituted by plural physical or logical links, and each node corresponds to each frontend LAN. A first data block is segmented into one or plural second data block units of fixed length and transferred to destination nodes, a bridge is provided in order to assemble the second data blocks into the first data block. The bridge can transmit the second data blocks to arbitrary links, and the receiving is performed through one link. The bridge a decoder also has a decoder for decoding whether the learning should be performed or not, based on the learning indication information existing in the second data block including the routing information.
    Type: Grant
    Filed: May 8, 1990
    Date of Patent: June 15, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Osamu Takada, Katsuyoshi Onishi, Koichi Kimura, Kazunori Nakamura, Yoshihiro Takiyasu, Mitsuhiro Yamaga, Kunio Hiyama
  • Patent number: 5210748
    Abstract: The present invention relates to an address filter method and unit to be used in a bridge unit or the like for connecting networks. The address filter unit carries out an address filter processing between a plurality of networks by using address information extracted from an incoming information frame registered in an entry table. In order to improve the processing efficiency of the address filter processing, the address filter unit includes timers corresponding to each address information registration, timer updating means for sequentially and intermittently advancing each timer value, and means for deleting registration of the address information corresponding to the timers from the entry table when a timer value becomes equal to or above a predetermined value.
    Type: Grant
    Filed: February 4, 1991
    Date of Patent: May 11, 1993
    Assignee: Hitachi, Ltd.
    Inventors: Katsuyoshi Onishi, Osamu Takada, Koichi Kimura, Mitsuhiro Yamaga, Toshihiko Ogura, Yasushi Shibata