Patents by Inventor Katsuaki Isobe

Katsuaki Isobe 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).

  • Publication number: 20240096417
    Abstract: In one embodiment, a semiconductor storage device includes a string that has one end electrically connected to a bit line, and another end electrically connected to a source line, and includes a plurality of memory cells. An operation of writing data to each of a plurality of adjacent first memory cells among the plurality of memory cells is sequentially performed in a direction from a first memory cell on a side of the source line to a first memory cell on a side of the bit line. An operation of reading data from each of the plurality of adjacent first memory cells is performed to allow a current to flow through the string in a first direction from the source line to the bit line.
    Type: Application
    Filed: June 20, 2023
    Publication date: March 21, 2024
    Applicant: Kioxia Corporation
    Inventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Keita KIMURA
  • Publication number: 20240087656
    Abstract: A semiconductor memory device includes a first memory cell transistor, a first bit line electrically coupled to the first memory cell transistor, a first sense amplifier, and a first latch circuit. The first sense amplifier includes a first node coupled to the first bit line, a first transistor including one end electrically coupled to the first latch circuit, a second node coupled to a gate of the first transistor, and a second transistor coupled between the first and second nodes. The second transistor is in an ON state during an operation of transferring a charge from the first bit line to the first and second nodes in accordance with data of the first memory cell transistor. The second transistor is in an OFF state during an operation of transferring data of the second node to the first latch circuit.
    Type: Application
    Filed: June 12, 2023
    Publication date: March 14, 2024
    Applicant: Kioxia Corporation
    Inventors: Katsuaki ISOBE, Takeshi HIOKA, Mario SAKO
  • Publication number: 20240029807
    Abstract: A semiconductor storage device includes a bit line, a select gate line, a sense amplifier circuit, a first transistor between the bit line and the sense amplifier circuit, and a second transistor between the bit line and a voltage generation circuit. In a first period of a program operation, the first transistor is turned OFF and the second transistor is turned ON, and a voltage of the first bit line is at a first voltage and a voltage of the select gate line is at a second voltage. In a second period of the program operation, the first transistor is turned ON and the second transistor is turned OFF, and a voltage of the first bit line is at a third voltage less than the first voltage and a voltage of the select gate line is at a fourth voltage greater than the second voltage.
    Type: Application
    Filed: February 28, 2023
    Publication date: January 25, 2024
    Inventors: Yuki INUZUKA, Katsuaki ISOBE
  • Publication number: 20230307434
    Abstract: A semiconductor memory device according to an embodiment includes a substrate, a first memory cell, a first bit line, a first word line, a first transistor, and a second transistor. The first memory cell is provided above the substrate. The first bit line extends in a first direction. The first bit line is coupled to the first memory cell. The first word line extends in a second direction intersecting the first direction. The first word line is coupled to the first memory cell. The first transistor is provided on the substrate. The first transistor is coupled to the first bit line. The second transistor is provided below the first memory cell and on the substrate. The second transistor is coupled to the first word line.
    Type: Application
    Filed: May 31, 2023
    Publication date: September 28, 2023
    Applicant: Kioxia Corporation
    Inventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Nobuaki OKADA, Hiroshi NAKAMURA, Takahiro TSURUDO
  • Patent number: 11705443
    Abstract: A semiconductor memory device according to an embodiment includes a substrate, a first memory cell, a first bit line, a first word line, a first transistor, and a second transistor. The first memory cell is provided above the substrate. The first bit line extends in a first direction. The first bit line is coupled to the first memory cell. The first word line extends in a second direction intersecting the first direction. The first word line is coupled to the first memory cell. The first transistor is provided on the substrate. The first transistor is coupled to the first bit line. The second transistor is provided below the first memory cell and on the substrate. The second transistor is coupled to the first word line.
    Type: Grant
    Filed: September 4, 2020
    Date of Patent: July 18, 2023
    Assignee: Kioxia Corporation
    Inventors: Hiroshi Maejima, Katsuaki Isobe, Nobuaki Okada, Hiroshi Nakamura, Takahiro Tsurudo
  • Patent number: 11302398
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Grant
    Filed: September 17, 2020
    Date of Patent: April 12, 2022
    Assignee: KIOXIA CORPORATION
    Inventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
  • Patent number: 11250915
    Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.
    Type: Grant
    Filed: October 12, 2020
    Date of Patent: February 15, 2022
    Assignee: Toshiba Memory Corporation
    Inventors: Hiroshi Maejima, Katsuaki Isobe, Naohito Morozumi, Go Shikata, Susumu Fujimura
  • Publication number: 20210118862
    Abstract: A semiconductor memory device according to an embodiment includes a substrate, a first memory cell, a first bit line, a first word line, a first transistor, and a second transistor. The first memory cell is provided above the substrate. The first bit line extends in a first direction. The first bit line is coupled to the first memory cell. The first word line extends in a second direction intersecting the first direction. The first word line is coupled to the first memory cell. The first transistor is provided on the substrate. The first transistor is coupled to the first bit line. The second transistor is provided below the first memory cell and on the substrate. The second transistor is coupled to the first word line.
    Type: Application
    Filed: September 4, 2020
    Publication date: April 22, 2021
    Applicant: Kioxia Corporation
    Inventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Nobuaki OKADA, Hiroshi NAKAMURA, Takahiro TSURUDO
  • Publication number: 20210027843
    Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.
    Type: Application
    Filed: October 12, 2020
    Publication date: January 28, 2021
    Applicant: Toshiba Memory Corporation
    Inventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Naohito MOROZUMI, Go SHIKATA, Susumu FUJIMURA
  • Publication number: 20210005266
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Application
    Filed: September 17, 2020
    Publication date: January 7, 2021
    Applicant: Toshiba Memory Corporation
    Inventors: Katsuaki ISOBE, Noboru SHIBATA, Toshiki HISADA
  • Patent number: 10839913
    Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: November 17, 2020
    Assignee: Toshiba Memory Corporation
    Inventors: Hiroshi Maejima, Katsuaki Isobe, Naohito Morozumi, Go Shikata, Susumu Fujimura
  • Patent number: 10783971
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Grant
    Filed: May 24, 2019
    Date of Patent: September 22, 2020
    Assignee: Toshiba Memory Corporation
    Inventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
  • Publication number: 20200176061
    Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.
    Type: Application
    Filed: September 11, 2019
    Publication date: June 4, 2020
    Applicant: Toshiba Memory Corporation
    Inventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Naohito MOROZUMO, Go SHIKATA, Susumu FUJIMURA
  • Publication number: 20190279721
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Application
    Filed: May 24, 2019
    Publication date: September 12, 2019
    Applicant: Toshiba Memory Corporation
    Inventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
  • Patent number: 10347341
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: July 9, 2019
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
  • Publication number: 20180190359
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Application
    Filed: March 5, 2018
    Publication date: July 5, 2018
    Applicant: Toshiba Memory Corporation
    Inventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
  • Patent number: 9953993
    Abstract: A semiconductor memory device includes a plurality of word lines stacked in a first direction; a semiconductor pillar extending through the plurality of word lines in the first direction; a source line electrically connected to the semiconductor pillar; and a transistor arranged in the first direction with the plurality of word lines. The transistor includes a gate electrode, source and drain regions positioned on both sides of the gate electrode respectively. The source line is positioned between the transistor and the plurality of word lines, and is electrically connected to one of the source and drain regions.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: April 24, 2018
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Tetsuaki Utsumi, Katsuaki Isobe
  • Patent number: 9934861
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Grant
    Filed: March 15, 2017
    Date of Patent: April 3, 2018
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
  • Publication number: 20180026044
    Abstract: A semiconductor memory device includes a plurality of word lines stacked in a first direction; a semiconductor pillar extending through the plurality of word lines in the first direction; a source line electrically connected to the semiconductor pillar; and a transistor arranged in the first direction with the plurality of word lines. The transistor includes a gate electrode, source and drain regions positioned on both sides of the gate electrode respectively. The source line is positioned between the transistor and the plurality of word lines, and is electrically connected to one of the source and drain regions.
    Type: Application
    Filed: March 13, 2017
    Publication date: January 25, 2018
    Applicant: Toshiba Memory Corporation
    Inventors: Tetsuaki UTSUMI, Katsuaki Isobe
  • Publication number: 20170186490
    Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.
    Type: Application
    Filed: March 15, 2017
    Publication date: June 29, 2017
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuaki ISOBE, Noboru SHIBATA, Toshiki HISADA