Patents by Inventor Joutaro Koshikawa

Joutaro Koshikawa 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).

  • Digital subscriber line communication method and apparatus
    Patent number: 7130299
    Abstract: A DSL communication method and apparatus provides mutual communications between a user-site DSL modem and a provider-site router by using an existing two-wire telephone line and an existing DSL communication technology. In the DSL modem, a plurality of virtual channel values are correlated to a PPP connection between the modem and the router. Input IP data is received and the IP data is output according to a priority class defined for a sender IP data contained in the input IP data. An ATM cell is generated in which one of the plurality of virtual channel values corresponding to the sender IP data of the input IP data is assigned to the output IP data. The resulting ATM cell is transmitted from the modem to a DSL circuit connected to the router.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: October 31, 2006
    Assignee: Fujitsu Limited
    Inventors: Kiyoshi Sukegawa, Yasuhiro Ono, Tetsuya Tsuboi, Joutaro Koshikawa
  • Digital subscriber line communication method and apparatus
    Publication number: 20030081614
    Abstract: A DSL communication method and apparatus provides mutual communications between a user-site DSL modem and a provider-site router by using an existing two-wire telephone line and an existing DSL communication technology. In the DSL modem, a plurality of virtual channel values are correlated to a PPP connection between the modem and the router. Input IP data is received and the IP data is output according to a priority class defined for a sender IP data contained in the input IP data. An ATM cell is generated in which one of the plurality of virtual channel values corresponding to the sender IP data of the input IP data is assigned to the output IP data. The resulting ATM cell is transmitted from the modem to a DSL circuit connected to the router.
    Type: Application
    Filed: March 18, 2002
    Publication date: May 1, 2003
    Inventors: Kiyoshi Sukegawa, Yasuhiro Ono, Tetsuya Tsuboi, Joutaro Koshikawa