Patents by Inventor Tetsuaki Utsumi

Tetsuaki Utsumi 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: 11929352
    Abstract: A semiconductor memory device includes a memory chip. The memory chip includes a first region including a plurality of first memory cells and second memory cells, a second region different from the first region, a plurality of first word lines stacked apart from each other in a first direction in the first and second regions, a first pillar including a first semiconductor layer extending through the first word lines, and a first insulator layer provided between the first semiconductor layer and the first word lines, in the first region, the first memory cells being located at intersections of the first pillar with the first word lines, a first bonding pad in the second region, and a first transistor between the first word lines and the first bonding pad, and connected between one of the first word lines and the first bonding pad, in the second region.
    Type: Grant
    Filed: November 10, 2022
    Date of Patent: March 12, 2024
    Assignee: Kioxia Corporation
    Inventors: Hiroshi Maejima, Toshifumi Hashimoto, Takashi Maeda, Masumi Saitoh, Tetsuaki Utsumi
  • Patent number: 11903210
    Abstract: A semiconductor memory device includes a semiconductor substrate, transistors formed in an upper surface of the semiconductor substrate, a stacked body provided on the semiconductor substrate, a first contact, and a second contact. The transistors are arranged along a first direction. A minimum period of an arrangement of the transistors is a first period. The stacked body includes electrode films. A configuration of a first portion of the stacked body is a staircase-like having terraces. A first region and a second region are set along the first direction in the first portion. A length in the first direction of the terrace disposed in the second region is longer than the first period. A length in the first direction of the terrace disposed in the first region is shorter than the first period.
    Type: Grant
    Filed: July 15, 2021
    Date of Patent: February 13, 2024
    Assignee: Kioxia Corporation
    Inventor: Tetsuaki Utsumi
  • Patent number: 11862288
    Abstract: A semiconductor storage device includes a first input driver configured to receive a first signal from a memory controller, a second input driver configured to receive a chip enable signal from the memory controller, and a first control circuit. The first control circuit is configured to set the semiconductor storage device in an enabled state or a disabled state depending on whether or not the first signal which is received during a time period that starts with assertion of the chip enable signal and is prior to receipt of a command sequence, corresponds to a first chip address.
    Type: Grant
    Filed: August 24, 2021
    Date of Patent: January 2, 2024
    Assignee: Kioxia Corporation
    Inventor: Tetsuaki Utsumi
  • Publication number: 20230395671
    Abstract: A semiconductor memory device includes: a semiconductor substrate; a memory cell array disposed separately from the semiconductor substrate in a first direction; and first and second transistor arrays disposed on the semiconductor substrate. The semiconductor substrate includes a first region to a fourth region arranged in a second direction and a fifth region to an eighth region arranged in the second direction. These regions are each adjacent in a third direction. The memory cell array includes first conducting layers disposed in the first to fourth regions and second conducting layers disposed in the fifth to eighth regions. The first transistor array includes transistors connected to the plurality of first conducting layers via contacts disposed in the second region. The second transistor array includes transistors connected to the plurality of second conducting layers via contacts disposed in the seventh region.
    Type: Application
    Filed: August 21, 2023
    Publication date: December 7, 2023
    Applicant: KIOXIA CORPORATION
    Inventor: Tetsuaki UTSUMI
  • Publication number: 20230395165
    Abstract: A semiconductor memory device includes word lines, first and second select gate lines, first and second semiconductor columns, first and second bit lines, and first and second transistors. The word lines are arranged in a first direction. The first and second select gate lines extend in a second direction and overlap with the word lines viewed from the first direction. The first and second select gate lines are arranged in the second direction. The first semiconductor column is opposed to the word lines and the first select gate line. The second semiconductor column is opposed to the word lines and the second select gate line. The first and second bit lines extend in a third direction and overlap with the first and second semiconductor columns viewed from the first direction. The first and second transistors are electrically connected to the first and second select gate lines.
    Type: Application
    Filed: August 2, 2023
    Publication date: December 7, 2023
    Applicant: Kioxia Corporation
    Inventor: Tetsuaki Utsumi
  • Publication number: 20230317709
    Abstract: A semiconductor storage device includes first and second chips and first and second power supply electrodes. The first chip includes conductive layers arranged in a first direction, a semiconductor pillar extending in the first direction and facing the conductive layers, first contacts extending in the first direction and connected to the conductive layers, second contacts extending in the first direction and connected to a first power supply electrode, third contacts extending in the first direction, facing the second contacts in a direction crossing the first direction, and connected to the second power supply electrode, and first bonding electrodes connected to the first contacts. The second chip includes a semiconductor substrate, transistors provided on the semiconductor substrate, fourth contacts connected to the transistors, and second bonding electrodes connected to the fourth contacts.
    Type: Application
    Filed: June 6, 2023
    Publication date: October 5, 2023
    Inventors: Nobuaki OKADA, Tetsuaki UTSUMI
  • Patent number: 11769808
    Abstract: A semiconductor memory device includes: a semiconductor substrate; a memory cell array disposed separately from the semiconductor substrate in a first direction; and first and second transistor arrays disposed on the semiconductor substrate. The semiconductor substrate includes a first region to a fourth region arranged in a second direction and a fifth region to an eighth region arranged in the second direction. These regions are each adjacent in a third direction. The memory cell array includes first conducting layers disposed in the first to fourth regions and second conducting layers disposed in the fifth to eighth regions. The first transistor array includes transistors connected to the plurality of first conducting layers via contacts disposed in the second region. The second transistor array includes transistors connected to the plurality of second conducting layers via contacts disposed in the seventh region.
    Type: Grant
    Filed: July 13, 2021
    Date of Patent: September 26, 2023
    Assignee: Kioxia Corporation
    Inventor: Tetsuaki Utsumi
  • Patent number: 11756634
    Abstract: A semiconductor memory device includes word lines, first and second select gate lines, first and second semiconductor columns, first and second bit lines, and first and second transistors. The word lines are arranged in a first direction. The first and second select gate lines extend in a second direction and overlap with the word lines viewed from the first direction. The first and second select gate lines are arranged in the second direction. The first semiconductor column is opposed to the word lines and the first select gate line. The second semiconductor column is opposed to the word lines and the second select gate line. The first and second bit lines extend in a third direction and overlap with the first and second semiconductor columns viewed from the first direction. The first and second transistors are electrically connected to the first and second select gate lines.
    Type: Grant
    Filed: September 22, 2022
    Date of Patent: September 12, 2023
    Assignee: Kioxia Corporation
    Inventor: Tetsuaki Utsumi
  • Patent number: 11710727
    Abstract: A semiconductor storage device includes first and second chips and first and second power supply electrodes. The first chip includes conductive layers arranged in a first direction, a semiconductor pillar extending in the first direction and facing the conductive layers, first contacts extending in the first direction and connected to the conductive layers, second contacts extending in the first direction and connected to a first power supply electrode, third contacts extending in the first direction, facing the second contacts in a direction crossing the first direction, and connected to the second power supply electrode, and first bonding electrodes connected to the first contacts. The second chip includes a semiconductor substrate, transistors provided on the semiconductor substrate, fourth contacts connected to the transistors, and second bonding electrodes connected to the fourth contacts.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: July 25, 2023
    Assignee: Kioxia Corporation
    Inventors: Nobuaki Okada, Tetsuaki Utsumi
  • Publication number: 20230080259
    Abstract: According to one embodiment, a semiconductor memory device includes a memory cell, a first voltage generator and a second voltage generator. The memory cell is provided above a substrate. The first voltage generator is provided between the substrate and the memory cell. The first voltage generator is configured to generate a first voltage to be supplied to the memory cell. The second voltage generator is provided between the substrate and the memory cell. The second voltage generator is configured to generate the first voltage and have a circuit configuration equivalent to the first voltage generator.
    Type: Application
    Filed: November 17, 2022
    Publication date: March 16, 2023
    Applicant: Kioxia Corporation
    Inventors: Tomoya SANUKI, Hiroshi MAEJIMA, Tetsuaki UTSUMI
  • Publication number: 20230074030
    Abstract: A semiconductor memory device includes a memory chip. The memory chip includes a first region including a plurality of first memory cells and second memory cells, a second region different from the first region, a plurality of first word lines stacked apart from each other in a first direction in the first and second regions, a first pillar including a first semiconductor layer extending through the first word lines, and a first insulator layer provided between the first semiconductor layer and the first word lines, in the first region, the first memory cells being located at intersections of the first pillar with the first word lines, a first bonding pad in the second region, and a first transistor between the first word lines and the first bonding pad, and connected between one of the first word lines and the first bonding pad, in the second region.
    Type: Application
    Filed: November 10, 2022
    Publication date: March 9, 2023
    Inventors: Hiroshi MAEJIMA, Toshifumi HASHIMOTO, Takashi MAEDA, Masumi SAITOH, Tetsuaki UTSUMI
  • Publication number: 20230014389
    Abstract: A semiconductor memory device includes word lines, first and second select gate lines, first and second semiconductor columns, first and second bit lines, and first and second transistors. The word lines are arranged in a first direction. The first and second select gate lines extend in a second direction and overlap with the word lines viewed from the first direction. The first and second select gate lines are arranged in the second direction. The first semiconductor column is opposed to the word lines and the first select gate line. The second semiconductor column is opposed to the word lines and the second select gate line. The first and second bit lines extend in a third direction and overlap with the first and second semiconductor columns viewed from the first direction. The first and second transistors are electrically connected to the first and second select gate lines.
    Type: Application
    Filed: September 22, 2022
    Publication date: January 19, 2023
    Applicant: Semiconductor Memory Device
    Inventor: Tetsuaki UTSUMI
  • Patent number: 11538791
    Abstract: A semiconductor memory device includes a memory chip. The memory chip includes a first region including a plurality of first memory cells and second memory cells, a second region different from the first region, a plurality of first word lines stacked apart from each other in a first direction in the first and second regions, a first pillar including a first semiconductor layer extending through the first word lines, and a first insulator layer provided between the first semiconductor layer and the first word lines, in the first region, the first memory cells being located at intersections of the first pillar with the first word lines, a first bonding pad in the second region, and a first transistor between the first word lines and the first bonding pad, and connected between one of the first word lines and the first bonding pad, in the second region.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: December 27, 2022
    Assignee: KIOXIA CORPORATION
    Inventors: Hiroshi Maejima, Toshifumi Hashimoto, Takashi Maeda, Masumi Saitoh, Tetsuaki Utsumi
  • Publication number: 20220399349
    Abstract: According to one embodiment, a semiconductor device includes a semiconductor layer, an element region provided on the semiconductor layer convexly, having a predetermined width in a first direction along a surface of the semiconductor layer, and extending in a second direction along the surface of the semiconductor layer and intersecting the first direction, a gate electrode arranged above the element region, a liner layer covering the gate electrode, and an element separation portion extends in the second direction on both sides of the element region in the first direction, and the liner layer continuously extends from the gate electrode to the element separation portion and the liner layer in the element separation portion lies below the element separation portion.
    Type: Application
    Filed: December 10, 2021
    Publication date: December 15, 2022
    Applicant: KIOXIA CORPORATION
    Inventors: Nobuaki OKADA, Tetsuaki UTSUMI
  • Patent number: 11508697
    Abstract: According to one embodiment, a semiconductor memory device includes a memory cell, a first voltage generator and a second voltage generator. The memory cell is provided above a substrate. The first voltage generator is provided between the substrate and the memory cell. The first voltage generator is configured to generate a first voltage to be supplied to the memory cell. The second voltage generator is provided between the substrate and the memory cell. The second voltage generator is configured to generate the first voltage and have a circuit configuration equivalent to the first voltage generator.
    Type: Grant
    Filed: March 2, 2020
    Date of Patent: November 22, 2022
    Assignee: Kioxia Corporation
    Inventors: Tomoya Sanuki, Hiroshi Maejima, Tetsuaki Utsumi
  • Patent number: 11495543
    Abstract: A semiconductor device includes a substrate and a first semiconductor layer and a second semiconductor layer each extending in a first direction perpendicular to a surface of the substrate. Furthermore, the semiconductor device includes a first plug provided on the first semiconductor layer and a second plug provided on the second semiconductor layers, and a connection wiring having an upper surface that is at a same height along the first direction as upper surfaces of the first and second plugs, and having a lower surface that is at a same height along the first direction as lower surfaces of the first and second plugs. Furthermore, the semiconductor device includes a first wiring provided on the first plug and the connection wiring and a second wiring provided on the second plug and the connection wiring.
    Type: Grant
    Filed: August 27, 2020
    Date of Patent: November 8, 2022
    Assignee: KIOXIA CORPORATION
    Inventor: Tetsuaki Utsumi
  • Patent number: 11488675
    Abstract: A semiconductor memory device includes word lines, first and second select gate lines, first and second semiconductor columns, first and second bit lines, and first and second transistors. The word lines are arranged in a first direction. The first and second select gate lines extend in a second direction and overlap with the word lines viewed from the first direction. The first and second select gate lines are arranged in the second direction. The first semiconductor column is opposed to the word lines and the first select gate line. The second semiconductor column is opposed to the word lines and the second select gate line. The first and second bit lines extend in a third direction and overlap with the first and second semiconductor columns viewed from the first direction. The first and second transistors are electrically connected to the first and second select gate lines.
    Type: Grant
    Filed: June 25, 2021
    Date of Patent: November 1, 2022
    Assignee: Kioxia Corporation
    Inventor: Tetsuaki Utsumi
  • Publication number: 20220157389
    Abstract: A semiconductor memory device includes word lines, first and second select gate lines, first and second semiconductor columns, first and second bit lines, and first and second transistors. The word lines are arranged in a first direction. The first and second select gate lines extend in a second direction and overlap with the word lines viewed from the first direction. The first and second select gate lines are arranged in the second direction. The first semiconductor column is opposed to the word lines and the first select gate line. The second semiconductor column is opposed to the word lines and the second select gate line. The first and second bit lines extend in a third direction and overlap with the first and second semiconductor columns viewed from the first direction. The first and second transistors are electrically connected to the first and second select gate lines.
    Type: Application
    Filed: June 25, 2021
    Publication date: May 19, 2022
    Applicant: Kioxia Corporation
    Inventor: Tetsuaki UTSUMI
  • Publication number: 20210399004
    Abstract: A semiconductor storage device includes a first conductive layer, a second conductive layer, a third conductive layer, a contact plug, a memory trench extending between the second conductive layer and the third conductive layer. The memory trench is formed around the contact plug, and surrounds a first area in which the contact plug is disposed. A second area is separated from the first area and includes a pillar penetrating the first conductive layer. The second conductive layer extends between the first and second areas, and is connected to the first conductive layer. The third conductive layer is on the opposite side of the first area to the second area, and is connected to the first conductive layer.
    Type: Application
    Filed: August 31, 2021
    Publication date: December 23, 2021
    Applicant: TOSHIBA MEMORY CORPORATION
    Inventors: Keisuke NAKATSUKA, Yoshitaka KUBOTA, Tetsuaki UTSUMI, Yoshiro SHIMOJO, Ryota KATSUMATA
  • Publication number: 20210383845
    Abstract: A semiconductor storage device includes a first input driver configured to receive a first signal from a memory controller, a second input driver configured to receive a chip enable signal from the memory controller, and a first control circuit. The first control circuit is configured to set the semiconductor storage device in an enabled state or a disabled state depending on whether or not the first signal which is received during a time period that starts with assertion of the chip enable signal and is prior to receipt of a command sequence, corresponds to a first chip address.
    Type: Application
    Filed: August 24, 2021
    Publication date: December 9, 2021
    Inventor: Tetsuaki UTSUMI