Patents by Inventor Shusaku Yamaguchi

Shusaku Yamaguchi 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).

  • Semiconductor memory device facilitating use of a high frequency clock signal
    Patent number: 5841717
    Abstract: A semiconductor memory device includes gates which open in a data-write operation and a data-read operation to allow a passage of data therethrough, and a control circuit changing an open period of the gates between the data-write operation and the data-read operation.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: November 24, 1998
    Assignee: Fujitsu Limited
    Inventor: Shusaku Yamaguchi
  • Random-access memory
    Patent number: 5828613
    Abstract: There are provided a sense amplifier driving circuit 900 applying a potential VCC/2 to wirings PSA and NSA when a block selecting signal BS0 is at a "L", and applying a potential VCC to the wiring PSA via a pMOS transistor 91 and applying a grounding potential to the wiring NSA via an nMOS transistor 94 when the block selecting signal BS0 is at a "H", and a LDB reset circuit 901A connected between the wiring PSA and a local data bus line pair LDB0 and *LDB0 and including pMOS transistors 95A and 96A which are closed/opened in correspondence to the open/closed state of a column gate 700.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: October 27, 1998
    Assignee: Fujitsu Limited
    Inventors: Atsushi Hatakeyama, Shusaku Yamaguchi