Patents by Inventor Katsuhiro Oki

Katsuhiro Oki 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).

  • Supervisory apparatus for transmission lines
    Patent number: 6671469
    Abstract: A supervisory apparatus able to prevent recirculation of a supervisory frame when sending a supervisor frame for supervision, which supervises an optical communications apparatuses connected to transmission lines in cooperation with the same by adding a sequence number to a supervisory frame when sending the supervisory frame.
    Type: Grant
    Filed: February 8, 2000
    Date of Patent: December 30, 2003
    Assignee: Fujitsu Limited
    Inventors: Takashi Fukagawa, Satoshi Kumano, Noboru Terai, Katsuhiro Oki, Takatsugu Kurokawa