Patents by Inventor Shigeaki Tanimoto

Shigeaki Tanimoto 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: 6226385
    Abstract: In an encryption communication system, an encrypt key ID of an encrypt apparatus appearing on a communication path between terminals is acquired by using a key seek packet, and an encrypt key ID is automatically learned based upon a key seek response packet for notifying the acquired encrypt key ID. As a result, communication data between the terminals are encrypted/decrypted, transparently relayed, and discarded by the respective encrypt apparatuses. Even when a communication network is made large and complex, the network for the encrypt communication can be readily managed.
    Type: Grant
    Filed: May 19, 1998
    Date of Patent: May 1, 2001
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Nippon Telegraph & Telephone Corp.
    Inventors: Takuya Taguchi, Toru Inada, Yasuhisa Tokiniwa, Akira Watanabe, Tetsuo Ideguchi, Shigeaki Tanimoto, Hikoyuki Nakajima, Shin-Ichi Kato
  • Patent number: 6075776
    Abstract: A VLAN control system is provided, which comprises: a remote access server, connected to a home network in the VLAN having a global network, for controlling communication between any moved terminal and the home network with reference to a management table for indicating a location of each terminal under connection; a remote access client, connected to each remote network, for controlling communication between the remote network and the global network with reference to a management table for indicating a correspondence relationship between each terminal which is connected to the remote network and the home network; and a VLAN management server, connected to the global network, for managing packet transmission and the location of each terminal with reference to a management table for indicating a correspondence relationship between each terminal and the remote access server and for indicating a location of each terminal under connection.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: June 13, 2000
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Shigeaki Tanimoto, Hikoyuki Nakajima, Kunihiko Isoda, Kouichi Nagai, Takashi Masui
  • Patent number: 5062035
    Abstract: An improved time slot allocation method for a loop network. Loop networks in which the present invention is applied include a loop-connecting a control station and a number of branch stations. The control and branch stations each have at least one terminal connected thereto such that interstation communication, when demanded by a terminal, is made by passing a frame through the transmission path. The frame includes a synchronization area for indicating the leading end of the frame, a fixed-length control area, and a data area composed of a plurality of time slots. According to the invention, the control and branch stations are each allocated with a predetermined or unique number of time slots to be used by terminals for interstation communication. When a station has its reserve of unused time slots fall below a preset lower limit, the control station supplements time slots from its own reserve.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: October 29, 1991
    Assignees: Kabushiki Kaisha Toshiba, Nippon Telegram and Telephone Corporation
    Inventors: Shigeaki Tanimoto, Tadashi Kayano, Hirobumi Karasawa, Osamu Yamagishi, Tomoo Kunikyo