Patents by Inventor Shigeharu Koyanagi

Shigeharu Koyanagi 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).

  • Computer interface architecture having a power saving function
    Patent number: 6772353
    Abstract: An information processing apparatus such as a personal computer is capable of controlling consumption power of a digital communication line interface circuit or a modem depending on a usage state of the communication line. In one aspect, the information processing apparatus including a digital communication interface circuit connected to a digital line to communicate data, includes a link state detect circuit to ascertain a link state between the interface circuit and the communication line and a consumption power mode change circuit to change a consumption power mode change circuit to change a consumption power mode of the interface circuit depending on the link state ascertained by the detect circuit.
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: August 3, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Yosuke Konaka, Yoshiaki Nomura, Shigeharu Koyanagi, Nobuhiro Kato
  • Information processing apparatus having a power saving function
    Publication number: 20010021981
    Abstract: An information processing apparatus such as a personal computer is capable of controlling consumption power of a digital communication line interface circuit or a modem depending on a usage state of the communication line. In an aspect, the information processing apparatus including a digital communication interface circuit connected to a digital line to communicate data, includes a link state detect circuit to ascertain a link state between the interface circuit and the communication line and a consumption power mode change circuit to change a consumption power mode of the interface circuit depending on the link state ascertained by the detect circuit.
    Type: Application
    Filed: May 21, 2001
    Publication date: September 13, 2001
    Applicant: Hitachi, Ltd.
    Inventors: Yosuke Konaka, Yoshiaki Nomura, Shigeharu Koyanagi, Nobuhiro Kato
  • Information processing apparatus having a power saving function
    Patent number: 6256742
    Abstract: An information processing apparatus such as a personal computer is capable of controlling consumption power of a digital communication line interface circuit or a modem depending on a usage state of the communication line. In one aspect, the information processing apparatus including a digital communication interface circuit connected to a digital line to communicate data, includes a link state detect circuit to ascertain a link state between the interface circuit and the communication line, and a consumption power mode change circuit to change a consumption power mode of the interface circuit depending on the link state ascertained by the detect circuit.
    Type: Grant
    Filed: December 6, 1999
    Date of Patent: July 3, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Yosuke Konaka, Yoshiaki Nomura, Shigeharu Koyanagi, Nobuhiro Kato
  • Computer interface architecture having a power saving function
    Patent number: 6055641
    Abstract: An information processing apparatus such as a personal computer is capable of controlling consumption power of a digital communication line interface circuit or a modem depending on a usage state of the communication line. In one aspect, the information processing apparatus including a digital communication interface circuit connected to a digital line to communicate data, includes a link state detect circuit to ascertain a link state between the interface circuit and the communication line, and a consumption power mode change circuit to change a consumption power mode of the interface circuit depending on the link state ascertained by the detect circuit.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: April 25, 2000
    Assignee: Hitachi, Ltd.
    Inventors: Yosuke Konaka, Yoshiaki Nomura, Shigeharu Koyanagi, Nobuhiro Kato