Patents by Inventor Yoshiki Matsukawa

Yoshiki Matsukawa 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).

  • ISDN terminal adapter capable of automatically changing from a packet switching mode to a circuit switching mode
    Patent number: 5598411
    Abstract: In an ISDN terminal adapter where both data communication by packet switching and data communication by circuit switching can be established, after data communication by packet switching is established, a time when no response is received is counted. When the time exceeds a definite time, data communication by circuit switching is established instead of data communication by packet switching.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: January 28, 1997
    Assignee: NEC Corporation
    Inventor: Yoshiki Matsukawa