Patents by Inventor Takao Sumiya

Takao Sumiya 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).

  • Loss-of-signal detecting device
    Patent number: 7684700
    Abstract: The invention relates to an optical transmitting device. Particularly, the invention provides a loss-of-signal detecting device that detects a loss of an optical signal received by a terminal station or a relay station, in the order of an SD and an SF.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: March 23, 2010
    Assignee: Fujitsu Limited
    Inventors: Yoshihiro Onoda, Takashi Sekiguchi, Takao Sumiya, Yoshihiro Kaneda
  • POWER SUPPLY SYSTEM
    Publication number: 20080136263
    Abstract: A power supply system for supplying a plurality of power-supply voltages to a load. The power supply system includes: a plurality of voltage output units which output the plurality of power-supply voltages; a gradient calculation unit which calculates the gradients of the plurality of power-supply voltages in intervals subsequent to certain moments immediately after the beginnings of rises of the plurality of power-supply voltages on the basis of the levels of the plurality of power-supply voltages at the moments; a gradient extraction unit which extracts the gentlest one of the gradients; and a power-supply control unit which controls the plurality of voltage output units so that the plurality of power-supply voltages rise with the gentlest one of the gradients.
    Type: Application
    Filed: November 20, 2007
    Publication date: June 12, 2008
    Applicant: FUJITSU LIMITED
    Inventors: Yoshihiro Kaneda, Takashi Sekiguchi, Takao Sumiya, Yoshihiro Onoda, Takuya Suemura
  • Loss-of-signal detecting device
    Publication number: 20070280684
    Abstract: The invention relates to an optical transmitting device. Particularly, the invention provides a loss-of-signal detecting device that detects a loss of an optical signal received by a terminal station or a relay station, in the order of an SD and an SF.
    Type: Application
    Filed: August 8, 2007
    Publication date: December 6, 2007
    Applicant: FUJITSU LIMITED
    Inventors: Yoshihiro Onoda, Takashi Sekiguchi, Takao Sumiya, Yoshihiro Kaneda