Patents by Inventor Hirofumi Maezawa

Hirofumi Maezawa 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).

  • Input/output optical fiber serial interface link that selectively transfers data in multiplex channel path mode or high speed single channel path mode
    Patent number: 6145024
    Abstract: An input/output data transfer system capable of integrating input/output data transfer on a plurality of input/output interface cables into data transfer on a single serial input/output interface cable for substantially reducing the number of input/output interface cables required for a host computer system. A multiplexer channel device is provided with a plurality of channels which serve as logical channels corresponding to conventional physical channel paths from a viewpoint of an operating system running on the host computer system. A multiplexer port device is provided with a plurality of input/output ports on a switching device or input/output device, each of these channels and ports shares a large-capacity input/output interface, and a channel path multiplexing function is performed for enabling frame-by-frame multiplexing and simultaneous input/output operations on plural channels.
    Type: Grant
    Filed: June 1, 1998
    Date of Patent: November 7, 2000
    Assignees: Hitachi, Ltd., Hitachi Information Technology Co., Ltd.
    Inventors: Hirofumi Maezawa, Kazuhiko Ninomiya