Patents by Inventor Kunihiko Ikuzaki

Kunihiko Ikuzaki 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: 5808951
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: September 15, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 5732037
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: March 24, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 5689457
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: March 6, 1996
    Date of Patent: November 18, 1997
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 5448520
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed irk the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: September 15, 1994
    Date of Patent: September 5, 1995
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 5365478
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: February 9, 1994
    Date of Patent: November 15, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 5170374
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: April 7, 1992
    Date of Patent: December 8, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki
  • Patent number: 4860255
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: August 22, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 4709353
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the data lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: December 15, 1986
    Date of Patent: November 24, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 4646267
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the date lines, is constructed of a pair of N-channel MOSFETS formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: April 22, 1986
    Date of Patent: February 24, 1987
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 4636989
    Abstract: A dynamic random access memory, which is accessed in response to an address strobe signal, has an automatic refresh circuit which consists of a clock generator that generates refresh clock pulses when the address strobe signal is not produced, and an address counter that increments a refresh address by counting the refresh clock pulses. Information retained in memory cells is automatically refreshed by an operation of the automatic refresh circuit. The dynamic random access memory of this arrangement does not need a special external terminal for the refresh operation and an external circuit associated therewith. Thus, the random access memory of this arrangement constructs, in effect, a pseudo static random access memory.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: January 13, 1987
    Assignee: Hitachi, Ltd.
    Inventor: Kunihiko Ikuzaki
  • Patent number: 4592022
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the data lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: July 19, 1985
    Date of Patent: May 27, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 4549284
    Abstract: A dynamic random access memory, which is accessed in response to an address strobe signal, has an automatic refresh circuit which consists of a clock generator that generates refresh clock pulses when the address strobe signal is not produced, and an address counter that increments a refresh address by counting the refresh clock pulses. Information retained in memory cells is automatically refreshed by an operation of the automatic refresh circuit. The dynamic random access memory of this arrangement does not need a special external terminal for the refresh operation and an external circuit associated therewith. Thus, the random access memory of this arrangement constructs, in effect, a pseudo static random access memory.
    Type: Grant
    Filed: March 10, 1983
    Date of Patent: October 22, 1985
    Assignee: Hitachi, Ltd.
    Inventor: Kunihiko Ikuzaki
  • Patent number: 4539658
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the data lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: August 8, 1984
    Date of Patent: September 3, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 4472792
    Abstract: A dynamic RAM integrated circuit of the one-element memory cell type is provided with a plurality of data lines, a sense amplifier, a plurality of word lines disposed in a manner to intersect with the data lines, and memory cells disposed at the points of intersection between the data lines and the word lines. The RAM includes a P-type semiconductor substrate and an N-type well region formed in the substrate. The memory cells are disposed within the well, and the sense amplifier, which is connected to the data lines, is constructed of a pair of N-channel MOSFETs formed in the semiconductor substrate and a pair of P-channel MOSFETs formed in the well region.
    Type: Grant
    Filed: May 13, 1982
    Date of Patent: September 18, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Katsuhiro Shimohigashi, Hiroo Masuda, Kunihiko Ikuzaki, Hiroshi Kawamoto
  • Patent number: 4085458
    Abstract: In a n-channel (or p-channel) random access memory in which a plurality of memory cells are arranged in a matrix form in a p-type (or n-type) semiconductor substrate, clamping MOSFET's are connected between word lines provided for the associated rows of memory cells of the matrix and a reference potential to which gates the source electrodes of the information storing MOSFET's of the memory cells are connected. The clamping MOSFET has a lower threshold voltage than a row selecting MOSFET connected to the word line and clamps the word line when the word line is not selected, so that a delay in the read-out operation is eliminated or suppressed.
    Type: Grant
    Filed: May 26, 1976
    Date of Patent: April 18, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Kunihiko Ikuzaki, Tsuneo Ito, Masamichi Ishihara, Takashi Sato