Patents by Inventor Fuminori Yumitori

Fuminori Yumitori 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).

  • Patent number: 5673226
    Abstract: The present invention relates to a high-speed data transmission system for efficiently transmitting large amounts of data within short periods of time. A DRAM comprises at least a memory cell, sense amplifiers, a /RAS signal input, a word line (WL) boost signal generator, a sense amplifier control signal-generator, and a sense amplifier drive signal-generator, wherein the memory cell is constituted by a plurality of banks, the sense amplifiers are provided in a corresponding plurality of numbers, the sense amplifier control signal-generator are provided in a plurality of numbers to correspond to the plurality of banks, and provision is made of external sense amplifier activating signal terminals which are connected to the sense amplifier control signal-generator in order to activate the sense amplifiers independently of the /RAS signal.
    Type: Grant
    Filed: October 23, 1996
    Date of Patent: September 30, 1997
    Assignee: Fujitsu Limited
    Inventors: Fuminori Yumitori, Yasuhiro Fujii
  • Patent number: 5617363
    Abstract: The present invention relates to a high-speed data transmission system for efficiently transmitting large amounts of data within short periods of time. A DRAM comprises at least a memory cell, sense amplifiers, a /RAS signal input, a word line (WL) boost signal generator, a sense amplifier control signal-generator, and a sense amplifier drive signal-generator, wherein the memory cell is constituted by a plurality of banks, the sense amplifiers are provided in a corresponding plurality of numbers, the sense amplifier control signal-generator are provided in a plurality of numbers to correspond to the plurality of banks, and provision is made of external sense amplifier activating signal terminals which are connected to the sense amplifier control signal-generator in order to activate the sense amplifiers independently of the /RAS signal.
    Type: Grant
    Filed: August 22, 1995
    Date of Patent: April 1, 1997
    Assignee: Fujitsu Limited
    Inventors: Fuminori Yumitori, Yasuhiro Fujii
  • Patent number: 5471425
    Abstract: The present invention relates to a high-speed data transmission system for efficiently transmitting large amounts of data within short periods of time. A DRAM comprises at least a memory cell, sense amplifiers, a /RAS signal input, a word line (WL) boost signal generator, a sense amplifier control signal-generator, and a sense amplifier drive signal-generator, wherein the memory cell is constituted by a plurality of banks, the sense amplifiers are provided in a corresponding plurality of numbers, the sense amplifier control signal-generator are provided in a plurality of numbers to correspond to the plurality of banks, and provision is made of external sense amplifier activating signal terminals which are connected to the sense amplifier control signal-generator in order to activate the sense amplifiers independently of the /RAS signal.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: November 28, 1995
    Assignee: Fujitsu Limited
    Inventors: Fuminori Yumitori, Yasuhiro Fujii
  • Patent number: 5428577
    Abstract: A semiconductor storage device having a word-line voltage booster circuit includes: a plurality of word-lines connected to each memory cell array; a drive signal generation circuit for producing a word-line drive signal having a voltage higher than a power supply voltage; a decoder circuit for transmitting the word-line drive signal produced by the drive signal generation circuit, when the drive signal generation circuit is selected by an address signal; and a charging circuit connected to a signal path which transmits the word-line drive signal from the drive signal generation circuit to the decoder circuit. The charging circuit charges the signal path before the word-line drive signal is output to the signal path.
    Type: Grant
    Filed: September 8, 1993
    Date of Patent: June 27, 1995
    Assignee: Fujitsu Limited
    Inventors: Fuminori Yumitori, Yasuhiro Fujii