Patents by Inventor Nobuhide Maruo

Nobuhide Maruo 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).

  • Communication device disconnecting a communication line by detecting an abnormal state of computer equipment
    Patent number: 7043267
    Abstract: A communication device is constructed to include a detecting section for detecting a signal peculiar to a universal serial bus (USB) obtained via the USB, and a disconnecting section for disconnecting a line which is being used for a communication when the signal peculiar to the USB is not detected by the detecting section within a predetermined time.
    Type: Grant
    Filed: November 7, 2000
    Date of Patent: May 9, 2006
    Assignee: Fujitsu Limited
    Inventors: Makoto Saotome, Nobuhide Maruo
  • Electronic apparatus having radio transmitter
    Patent number: 7003270
    Abstract: An electronic apparatus comprising a radio transmitter is disclosed. In a computer system (1) having a radio transmission circuit (3) of a phase modulation type supplied with power from a power supply (4) of a switching type, the switching frequency of the power supply (4) is determined based on the comparison frequency for the sampling operation of a PLL circuit (10) of the radio transmitter, thereby removing the power noises generated from the switching regulator of the radio transmitter of a phase modulation type.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: February 21, 2006
    Assignee: Fujitsu Limited
    Inventors: Nobuhide Maruo, Makoto Saotome, Makoto Kotani
  • Electronic apparatus having radio transmitter
    Publication number: 20030083025
    Abstract: An electronic apparatus comprising a radio transmitter is disclosed. In a computer system (1) having a radio transmission circuit (3) of a phase modulation type supplied with power from a power supply (4) of a switching type, the switching frequency of the power supply (4) is determined based on the comparison frequency for the sampling operation of a PLL circuit (10) of the radio transmitter, thereby removing the power noises generated from the switching regulator of the radio transmitter of a phase modulation type.
    Type: Application
    Filed: February 5, 2002
    Publication date: May 1, 2003
    Applicant: Fujitsu Limited
    Inventors: Nobuhide Maruo, Makoto Saotome, Makoto Kotani
  • Modem unit
    Patent number: 5655009
    Abstract: A modem unit is adapted to be coupled between a land or radio telephone line and a terminal equipment. The modem unit is provided with a modem circuit for modulating data received from the terminal equipment and for demodulating data transmitted to the terminal equipment. Additionally an isolation circuit for providing a DC isolation between the telephone line and the terminal equipment is included. The modem circuit and the isolation circuit are respectively provided on a single modem integrated circuit card.
    Type: Grant
    Filed: March 17, 1993
    Date of Patent: August 5, 1997
    Assignee: Fujitsu Limited
    Inventors: Yasuhiro Arai, Nobuhide Maruo, Yoshiaki Narita