Patents by Inventor Koichi Ashizawa

Koichi Ashizawa 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: 20210272810
    Abstract: A semiconductor manufacturing method by a semiconductor manufacturing device includes: positioning an anode, which causes an oxidation reaction, in a first end of a base material containing an aluminum oxide and a cathode, which causes a reduction reaction, in a second end of the base material; heating the base material to melt it with the anode being in contact with the first end of the base material and the cathode being in contact with the second end of the base material; causing a current to flow between the anode and the cathode to cause a molten salt electrolysis reaction for a whole of or a part of a period in which the base material is at least partially melted; and after the molten salt electrolysis reaction, cooling the base material to form a p-type aluminum oxide semiconductor layer and an n-type aluminum oxide semiconductor layer.
    Type: Application
    Filed: August 30, 2019
    Publication date: September 2, 2021
    Inventors: Hiroki Arima, Koichi Ashizawa
  • Patent number: 10930522
    Abstract: A semiconductor layer of the present invention is a semiconductor layer including: a pn junction at which an n-type semiconductor (Al2O3 (n-type)) and a p-type semiconductor (Al2O3 (p-type)) are joined, the n-type semiconductor (Al2O3 (n-type)) having a donor level that is formed by causing an aluminum oxide film (Al2O3) to excessively contain aluminum (Al), the p-type semiconductor (Al2O3 (p-type)) having an acceptor level that is formed by causing an aluminum oxide film (Al2O3) to excessively contain oxygen (O).
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: February 23, 2021
    Assignee: UACJ Corporation
    Inventor: Koichi Ashizawa
  • Publication number: 20200227756
    Abstract: An improvement in electrical conductivity of an aluminum member is provided. A surface film of the aluminum member contains at least one of aluminum oxide and aluminum hydroxide, and the surface film includes not less than 100000 semiconducting portions per square centimeter of a surface of the aluminum member, the semiconducting portions being formed in portions of the surface film where water molecules cohere together.
    Type: Application
    Filed: October 27, 2017
    Publication date: July 16, 2020
    Inventor: Koichi Ashizawa
  • Publication number: 20200135494
    Abstract: A semiconductor layer of the present invention is a semiconductor layer including: a pn junction at which an n-type semiconductor (Al2O3 (n-type)) and a p-type semiconductor (Al2O3 (p-type)) are joined, the n-type semiconductor (Al2O3 (n-type)) having a donor level that is formed by causing an aluminum oxide film (Al2O3) to excessively contain aluminum (Al), the p-type semiconductor (Al2O3 (p-type)) having an acceptor level that is formed by causing an aluminum oxide film (Al2O3) to excessively contain oxygen (O).
    Type: Application
    Filed: June 8, 2018
    Publication date: April 30, 2020
    Inventor: Koichi Ashizawa
  • Patent number: 10418636
    Abstract: A current-collector metal foil has at least at least one roughened surface and numerous recessed parts are present on the roughened surface. Each recessed part has an edge part that surrounds a bottom-surface part and is raised above the bottom-surface part. The average Feret diameter Lave of the recessed parts is 0.5-50 ?m. The current-collector metal foil is suitable for use, e.g., as an electrode current collector for a lithium-ion secondary battery, a sodium secondary battery, an electric double-layer capacitor, or a lithium-ion capacitor.
    Type: Grant
    Filed: June 3, 2015
    Date of Patent: September 17, 2019
    Assignee: UACJ CORPORATION
    Inventors: Koichi Ashizawa, Tetsuya Motoi, Atsushi Koishikawa, Yasushi Funato
  • Patent number: 10367204
    Abstract: It is an object to provide an aluminum alloy foil for an electrode current collector, the foil having a high post-drying strength after application of an active material while keeping a high electrical conductivity. Disclosed is an aluminum alloy foil for an electrode current collector, comprising 0.03 to 0.1 mass % (hereinafter, “mass %” is simply referred to as “%”) of Fe, 0.01 to 0.1% of Si, and 0.0001 to 0.01% of Cu, with the rest consisting of Al and unavoidable impurities, wherein the aluminum alloy foil after final cold rolling has a tensile strength of 180 MPa or higher, a 0.2% yield strength of 160 MPa or higher, and an electrical conductivity of 60% IACS or higher; and the aluminum alloy foil has a tensile strength of 170 MPa or higher and a 0.2% yield strength of 150 MPa or higher even after the aluminum alloy foil is subjected to heat treatment at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: July 30, 2019
    Assignees: UACJ Corporation, UACJ Foil Corporation
    Inventors: Masakazu Seki, Satoshi Suzuki, Tomohiko Furutani, Kenji Yamamoto, Koichi Ashizawa
  • Patent number: 10050257
    Abstract: An aluminum alloy foil for an electrode current collectors has a high post-drying strength after application of an active material while keeping a high electrical conductivity. The aluminum alloy foil includes 0.1 to 1.0 mass % of Fe, 0.01 to 0.5% of Si, and 0.01 to 0.2 mass % of Cu, and the rest includes Al and unavoidable impurities. The aluminum alloy foil after final cold rolling has a tensile strength of 220 MPa or higher, a 0.2% yield strength of 180 MPa or higher, and an electrical conductivity of 58% IACS or higher. The aluminum alloy foil has a tensile strength of 190 MPa or higher and a 0.2% yield strength of 160 MPa or higher after the aluminum alloy foil is heat treated at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: August 14, 2018
    Assignees: UACJ CORPORATION, UACJ FOIL CORPORATION
    Inventors: Masakazu Seki, Satoshi Suzuki, Tomohiko Furutani, Kenji Yamamoto, Koichi Ashizawa
  • Publication number: 20170092955
    Abstract: A current-collector metal foil has at least at least one roughened surface and numerous recessed parts are present on the roughened surface. Each recessed part has an edge part that surrounds a bottom-surface part and is raised above the bottom-surface part.. The average Feret diameter Lave of the recessed parts is 0.5-50 ?m. The current-collector metal foil is suitable for use, e.g., as an electrode current collector for a lithium-ion secondary battery, a sodium secondary battery, an electric double-layer capacitor, or a lithium-ion capacitor.
    Type: Application
    Filed: June 3, 2015
    Publication date: March 30, 2017
    Inventors: Koichi ASHIZAWA, Tetsuya MOTOI, Atsushi KOISHIKAWA, Yasushi FUNATO
  • Publication number: 20170040617
    Abstract: It is an object to provide an aluminum alloy foil for an electrode current collector, the foil having a high post-drying strength after application of an active material while keeping a high electrical conductivity. Disclosed is an aluminum alloy foil for an electrode current collector, comprising 0.03 to 0.1 mass % (hereinafter, “mass %” is simply referred to as “%”) of Fe, 0.01 to 0.1% of Si, and 0.0001 to 0.01% of Cu, with the rest consisting of Al and unavoidable impurities, wherein the aluminum alloy foil after final cold rolling has a tensile strength of 180 MPa or higher, a 0.2% yield strength of 160 MPa or higher, and an electrical conductivity of 60% IACS or higher; and the aluminum alloy foil has a tensile strength of 170 MPa or higher and a 0.2% yield strength of 150 MPa or higher even after the aluminum alloy foil is subjected to heat treatment at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.
    Type: Application
    Filed: October 21, 2016
    Publication date: February 9, 2017
    Applicants: UACJ Corporation, UACJ Foil Corporation
    Inventors: Masakazu Seki, Satoshi Suzuki, Tomohiko Furutani, Kenji Yamamoto, Koichi Ashizawa
  • Publication number: 20140255788
    Abstract: An object of the present invention is to provide a current collector which includes an aluminum alloy foil for electrode current collector, with high electrical conductivity and high strength after a drying process performed after application of an active material. According to the present invention, provided is a current collector including a conductive substrate and a resin layer provided on one side or both sides of the conductive substrate, wherein: the conductive substrate is an aluminum alloy foil containing 0.03 to 1.0 mass % (hereinafter mass % is referred to as %) of Fe, 0.01 to 0.3% of Si, 0.0001 to 0.2% of Cu, with the rest being Al and unavoidable impurities, an aluminum alloy foil after a final cold rolling having a tensile strength of 180 MPa or higher, a 0.2% yield strength of 160 MPa or higher, and an electrical conductivity of 58% IACS or higher; an aluminum alloy foil after performing a heat treatment at 120° C. for 24 hours, at 140° C. for 3 hours, or at 160° C.
    Type: Application
    Filed: July 29, 2011
    Publication date: September 11, 2014
    Applicants: UACJ FOIL CORPORATION, UACJ CORPORATION
    Inventors: Masakuzu Seki, Osamu Kato, Sohei Saito, Yukiou Honkawa, Satoshi Suzuki, Koichi Ashizawa, Mitsuyuki Wasamoto, Kenichi Kadowaki, Kenji Yamamoto
  • Publication number: 20130302676
    Abstract: It is an object to provide an aluminum alloy foil for an electrode current collector, the foil having a high post-drying strength after application of an active material while keeping a high electrical conductivity. Disclosed is an aluminum alloy foil for an electrode current collector, comprising 0.1 to 1.0 mass % (hereinafter, “mass %” is simply referred to as “%”) of Fe, 0.01 to 0.5% of Si, and 0.01 to 0.2% of Cu, with the rest consisting of Al and unavoidable impurities, wherein the aluminum alloy foil after final cold rolling has a tensile strength of 220 MPa or higher, a 0.2% yield strength of 180 MPa or higher, and an electrical conductivity of 58% IACS or higher; and the aluminum ally foil has a tensile strength of 190 MPa or higher and a 0.2% yield strength of 160 MPa or higher even after the aluminum alloy foil is subjected to heat treatment at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.
    Type: Application
    Filed: December 12, 2011
    Publication date: November 14, 2013
    Applicants: NIPPON FOIL MFG. CO., LTD., FURUKAWA-SKY ALUMINUM CORP.
    Inventors: Masakazu Seki, Satoshi Suzuki, Tomohiko Furutani, Kenji Yamamoto, Koichi Ashizawa
  • Publication number: 20130269842
    Abstract: It is an object to provide an aluminum alloy foil for an electrode current collector, the foil having a high post-drying strength after application of an active material while keeping a high electrical conductivity. Disclosed is an aluminum alloy foil for an electrode current collector, comprising 0.03 to 0.1 mass % (hereinafter, “mass %” is simply referred to as “%”) of Fe, 0.01 to 0.1% of Si, and 0.0001 to 0.01% of Cu, with the rest consisting of Al and unavoidable impurities, wherein the aluminum alloy foil after final cold rolling has a tensile strength of 180 MPa or higher, a 0.2% yield strength of 160 MPa or higher, and an electrical conductivity of 60% IACS or higher; and the aluminum alloy foil has a tensile strength of 170 MPa or higher and a 0.2% yield strength of 150 MPa or higher even after the aluminum alloy foil is subjected to heat treatment at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.
    Type: Application
    Filed: December 12, 2011
    Publication date: October 17, 2013
    Applicants: NIPPON FOIL MFG. CO., LTD., FURUKAWA-SKY ALUMINUM CORP.
    Inventors: Masakazu Seki, Satoshi Suzuki, Tomohiko Furutani, Kenji Yamamoto, Koichi Ashizawa
  • Patent number: 7191502
    Abstract: There is provided a current collector for use in a secondary battery on which active material coated on both sides of a metal foil are difficult to drop out. The metal foil is provided with a large number of penetrating holes, the periphery of which are formed into a complicated shape, and active material, binder, etc. are intruded on each periphery, whereby the active material, etc. coated on both sides of the current collector consisting of the metal foil are prevented from dropping out. An area S of penetrating holes is in the range of 0.05 to 0.50 mm2 a value M/N is in the range of 1.30 to 100 wherein M is the peripheral length of the penetrating holes and N is the peripheral length of a virtual circle having the area S of the penetrating hole. The current collector having such a large number of penetrating holes is obtained by passing a metal foil without a hole through between a concavo-convex roll having a large number of convex parts and a smoothing roll.
    Type: Grant
    Filed: July 29, 1998
    Date of Patent: March 20, 2007
    Assignees: Nippon Foil Mfg. Co., Ltd., Nippaku Sangyo Co., Ltd.
    Inventors: Koichi Ashizawa, Atsushi Mori
  • Patent number: 6153077
    Abstract: A method of manufacturing a porous electrolytic metal foil, in which a thin metal layer is formed by electrically depositing a metal on the surface of a cathode body by moving the cathode body through an electrolyte. The thin metal layer is separated from the cathode body to form an exposed surface on the cathode body and a film of an electrical insulating material is formed on the exposed surface of the cathode body, by spraying a resin liquid onto the exposed surface, or by suspending machine oil or insulating oil in the electrolyte. The metal foil thus produced has many open-pores in the thickness direction. Therefore, when the metal foil is used as a collector for a battery electrode, there is an improvement in the cycle life characteristics of the battery.
    Type: Grant
    Filed: April 24, 1998
    Date of Patent: November 28, 2000
    Assignee: Circuit Foil Japan Co., Ltd.
    Inventors: Hitoshi Kato, Koichi Ashizawa, Tsukasa Akutsu
  • Patent number: 6096455
    Abstract: A plate-like current collector and the method of producing the same, said collector comprising a metal foil having a plurality of bowl-like projections, each projection projecting downwardly from the front side thereof to the reverse side thereof and having a penetrated hole in the center of the projection, a turning peripheral portion of the central penetrated hole formed to curve upwardly to a level positioning beneath the front side of the metal foil, wherein the penetrated hole may be enlarged or contracted using the elastic deformation of the turning peripheral portion.
    Type: Grant
    Filed: October 21, 1998
    Date of Patent: August 1, 2000
    Assignees: Nippon Seihaku Kabushiki Kaisha, Nippaku Sangyo Kabushiki Kaisha
    Inventors: Susumu Satake, Koichi Ashizawa, Kazuo Tahara
  • Patent number: 5665218
    Abstract: An oxygen generating electrode has a base material with at least a surface thereof made of titanium alone or a titanium alloy, a primary coating formed on the surface of the base material, and a catalyst layer formed on the primary coating and containing an oxide of platinum group element as a main component. The primary coating is composed of a titanium oxide coating and an oxide mixture layer, the titanium oxide coating being made of a titanium oxide only and including a first titanium oxide layer formed by electrolytically oxidizing the surface of the base material and a second titanium oxide layer formed on the first titanium oxide layer by a thermal decomposition method, the oxide mixture layer including at least one layer formed on the titanium oxide coating and consisting of a mixture containing an oxide of an element belonging to a group other than the platinum group, as a main component, and an oxide of a platinum group element.
    Type: Grant
    Filed: January 4, 1996
    Date of Patent: September 9, 1997
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Koichi Ashizawa, Toshio Horie, Hitoshi Kato
  • Patent number: 5441627
    Abstract: There is provided a metal foil manufacturing method, in which a metal foil is manufactured by forming a thin metal layer by electrodepositing a metal on the surface of a cathode through an electrolytic reaction, and then separating the thin metal layer from the cathode surface. In doing this, an anodized film forming apparatus is mounted on an exposed surface of the cathode exposed after the separation of the metal layer, and is operated to subject the exposed surface of the cathode continuously or intermittently to electrolytic oxidation, thereby forming an anodized film on the exposed surface.
    Type: Grant
    Filed: May 20, 1994
    Date of Patent: August 15, 1995
    Assignees: The Furukawa Electric Co., Ltd, Circuit Foil Japan Co., Ltd.
    Inventors: Hitoshi Kato, Toshio Horie, Koichi Ashizawa
  • Patent number: 4894294
    Abstract: In an electrolytic solution supply type battery of an arrangement wherein an electrolytic solution is distributed and supplied to each of a plurality of electrically series-connected or stacked unit cells from a common supply path through distribution liquid paths, respectively, and the electrolytic solution is exhausted from each of the plurality of unit cells and collected in a common exhaust path through exhaust liquid paths, respectively, each distribution liquid path at an electrolytic solution supply side and/or each exhaust liquid path has midway therealong a liquid flow interrupt portion utilizing natural fall of the electrolytic solution. At the portion, the electrolytic solution is rendered discontinuous during falling and is formed into droplets, thereby preventing liquid short-circuit between each two adjacent unit cells.
    Type: Grant
    Filed: May 30, 1985
    Date of Patent: January 16, 1990
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Koichi Ashizawa, Hideharu Ogino, Shunji Shimizu