Patents by Inventor Katsumi Okamura

Katsumi Okamura 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: 20220250990
    Abstract: A cubic boron nitride sintered material comprises cubic boron nitride particles, a binding phase, and an interfacial phase. The interfacial phase intervenes between the cubic boron nitride particles and the binding phase. The interfacial phase includes aluminum, nitrogen, boron, and oxygen. A total of an average value of the atomic concentrations of aluminum included in the interfacial phase and an average value of the atomic concentrations of nitrogen included in the interfacial phase is 50.0 at % or more. A ratio of an average value of the atomic concentrations of nitrogen included in the interfacial phase to an average value of the atomic concentrations of boron included in the interfacial phase is more than 1.00.
    Type: Application
    Filed: July 17, 2020
    Publication date: August 11, 2022
    Inventors: Katsumi OKAMURA, Mayu AMEMIYA, Akito ISHII, Yuka DEGUCHI, Satoru KUKINO
  • Patent number: 11396482
    Abstract: A cubic boron nitride sintered material includes: more than or equal to 85 volume % and less than 100 volume % of cubic boron nitride grains; and a remainder of a binder, wherein the binder includes WC, Co and an Al compound, and when a TEM-EDX is used to analyze an interface region including an interface at which the cubic boron nitride grains are adjacent to each other, oxygen exists on a whole or part of the interface, and a width D of a region in which the oxygen exists is more than or equal to 0.1 nm and less than or equal to 10 nm.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: July 26, 2022
    Assignees: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Katsumi Okamura, Yuichiro Watanabe, Akito Ishii, Takashi Harada, Satoru Kukino
  • Patent number: 11396451
    Abstract: A tungsten carbide powder contains tungsten carbide as a main component and chromium, in which, when mass concentrations of tungsten and chromium are measured at 100 or more analysis points randomly selected from a field of view of SEM observation of the tungsten carbide powder, a standard deviation ? of distribution of the ratio by percentage of the concentration of chromium to the total concentration of tungsten and chromium is 0.5 or less.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: July 26, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masato Michiuchi, Takamasa Onoki, Katsumi Okamura, Takayuki Fudo, Takehiko Hayashi
  • Patent number: 11383300
    Abstract: A sintered material has 3% by volume or more and 80% by volume or less of cubic boron nitride grains and a binder. The binder contains: one or more types selected from the group consisting of one or more compounds composed of one or more first elements selected from the group consisting of a group 4 element, a group 5 element, a group 6 element, Al and Si and one or more second elements selected from the group consisting of C, N, O and B, and a solid solution of these compounds; and one or more metallic elements selected from the group consisting of Li, Ca, Na, Sr, Ba and Be. The binder contains the one or more metallic elements of 0.001% by mass or more and 0.5% by mass or less in total, and oxygen of 0.1% by mass or more and 10.0% by mass or less.
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: July 12, 2022
    Assignees: Sumitomo Electric Industries, Ltd., Sumitomo Electric Hardmetal Corp.
    Inventors: Katsumi Okamura, Akito Ishii, Satoru Kukino
  • Patent number: 11377390
    Abstract: A cubic boron nitride sintered material includes: more than 80 volume % and less than 100 volume % of cubic boron nitride grains; and more than 0 volume % and less than 20 volume % of a binder phase. The binder phase includes: at least one selected from a group consisting of a simple substance, an alloy, and an intermetallic compound selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, aluminum, silicon, cobalt, and nickel. A dislocation density of the cubic boron nitride grains is more than or equal to 3×1017/m2 and less than or equal to 1×1020/m2.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: July 5, 2022
    Assignees: Sumitomo Electric Industries, Ltd., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Akito Ishii, Katsumi Okamura, Hironari Moroguchi, Satoru Kukino
  • Publication number: 20220204412
    Abstract: A cubic boron nitride sintered material includes: 20 to 80 volume % of cBN grains; and 20 to 80 volume % of a binder phase, wherein the binder phase includes first binder grains and second binder grains, in each of the first binder grains, a ratio of the number of atoms of the first metal element to a total of the number of atoms of the titanium and the first metal element is more than or equal to 0.01% and less than 10%, in each of the second binder grains, the ratio is more than or equal to 10% and less than or equal to 80%, and an average grain size of the second binder grains is more than or equal to 0.2 ?m and less than or equal to 1 ?m.
    Type: Application
    Filed: July 17, 2020
    Publication date: June 30, 2022
    Inventors: Mayu AMEMIYA, Katsumi OKAMURA, Akito ISHII, Satoru KUKINO, Hironari MOROGUCHI
  • Publication number: 20220204413
    Abstract: A cubic boron nitride sintered material includes: 20 to 80 volume % of cBN grains; and 20 to 80 volume % of a binder phase, wherein the binder phase includes first binder grains and second binder grains, in each of the first binder grains, a ratio of the number of atoms of the first metal element to a total of the number of atoms of the titanium and the number of atoms of the first metal element is more than or equal to 0.01% and less than 10%, in each of the second binder grains, this ratio is more than or equal to 10% and less than or equal to 80%, and in an X-ray diffraction spectrum of the cubic boron nitride sintered material, one or both of conditions 1 and 2 are satisfied.
    Type: Application
    Filed: July 17, 2020
    Publication date: June 30, 2022
    Inventors: Mayu AMEMIYA, Akito ISHII, Katsumi OKAMURA, Hironari MOROGUCHI, Satoru KUKINO
  • Publication number: 20220204411
    Abstract: A cubic boron nitride sintered material includes: more than or equal to 20 volume % and less than 80 volume % of cubic boron nitride grains; and more than 20 volume % and less than or equal to 80 volume % of a binder phase, and when a carbon content is measured from a cubic boron nitride grain into the binder phase in a direction perpendicular to an interface between the cubic boron nitride grain and the binder phase using TEM-EDX, a first region having a carbon content larger than an average value of a carbon content of the binder phase exists, the interface exists in the first region, and a length of the first region is more than or equal to 0.1 nm and less than or equal to 10 nm.
    Type: Application
    Filed: July 17, 2020
    Publication date: June 30, 2022
    Inventors: Hisaya HAMA, Katsumi OKAMURA, Akito ISHII, Satoru KUKINO
  • Patent number: 11352298
    Abstract: A cubic boron nitride sintered material includes: more than 80 volume % and less than 100 volume % of cubic boron nitride grains; and more than 0 volume % and less than 20 volume % of a binder phase. The binder phase includes: at least one selected from a group consisting of a simple substance, an alloy, and an intermetallic compound selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, aluminum, silicon, cobalt, and nickel. A dislocation density of the cubic boron nitride grains is more than or equal to 1×1015/m2 and less than or equal to 1×1017/m2.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: June 7, 2022
    Assignees: Sumitomo Electric Industries, Ltd., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Akito Ishii, Katsumi Okamura, Hironari Moroguchi, Satoru Kukino
  • Patent number: 11338370
    Abstract: A cutting tool includes a base material, and a coating film covering the base material in contact with the base material. The base material is a cubic boron nitride sintered material. The coating film is a ceramic. An amount of oxygen in the coating film is less than or equal to 0.040 mass percent.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: May 24, 2022
    Assignees: Sumitomo Electric Industries, Ltd., Sumitomo Electric Hardmetal Corp.
    Inventors: Katsumi Okamura, Satoru Kukino, Makoto Setoyama
  • Patent number: 11339096
    Abstract: A tungsten carbide powder 1 includes bonded bodies 10 each including a plurality of tungsten carbide crystal grains 11, in which the bonded bodies 10 include, at a grain boundary 11a between the plurality of tungsten carbide crystal grains 11, a chromium-concentrated region 12 which has a chromium concentration higher than that in the tungsten carbide crystal grains 11.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: May 24, 2022
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Masato Michiuchi, Takamasa Onoki, Katsumi Okamura, Takayuki Fudo, Takehiko Hayashi
  • Publication number: 20220153651
    Abstract: A cubic boron nitride sintered material includes: more than or equal to 80 volume % and less than or equal to 96 volume % of cubic boron nitride grains; and a binder, wherein the binder includes tungsten carbide, cobalt, and an aluminum compound, and Ha/Hb?0.40 is satisfied, where Hb represents a hardness of the cubic boron nitride sintered material and Ha represents a hardness of the cubic boron nitride sintered material after performing acid treatment onto the cubic boron nitride sintered material to substantially remove the binder in the cubic boron nitride sintered material.
    Type: Application
    Filed: November 4, 2020
    Publication date: May 19, 2022
    Inventors: Akito ISHII, Katsumi OKAMURA, Hisaya HAMA, Yuh ISHIDA, Issei NAGASHIMA
  • Publication number: 20220144708
    Abstract: A tungsten carbide powder 1 includes bonded bodies 10 each including a plurality of tungsten carbide crystal grains 11, in which the bonded bodies 10 include, at a grain boundary 11a between the plurality of tungsten carbide crystal grains 11, a chromium-concentrated region 12 which has a chromium concentration higher than that in the tungsten carbide crystal grains 11.
    Type: Application
    Filed: April 21, 2020
    Publication date: May 12, 2022
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Masato MICHIUCHI, Takamasa ONOKI, Katsumi OKAMURA, Takayuki FUDO, Takehiko HAYASHI
  • Publication number: 20220089447
    Abstract: A tungsten carbide powder contains tungsten carbide as a main component and chromium, in which, when mass concentrations of tungsten and chromium are measured at 100 or more analysis points randomly selected from a field of view of SEM observation of the tungsten carbide powder, a standard deviation ? of distribution of the ratio by percentage of the concentration of chromium to the total concentration of tungsten and chromium is 0.5 or less.
    Type: Application
    Filed: April 21, 2020
    Publication date: March 24, 2022
    Applicant: Sumitomo Electric Industries, Ltd.
    Inventors: Masato MICHIUCHI, Takamasa ONOKI, Katsumi OKAMURA, Takayuki FUDO, Takehiko HAYASHI
  • Publication number: 20220025490
    Abstract: A method of producing a cubic boron nitride sintered material includes: forming an organic cubic boron nitride powder by attaching an organic substance onto a cubic boron nitride source material powder; preparing a powder mixture including more than or equal to 85 volume % and less than 100 volume % of the organic cubic boron nitride powder and a remainder of a binder source material powder by mixing the organic cubic boron nitride powder and the binder source material powder, the binder source material powder including WC, Co and Al; and obtaining the cubic boron nitride sintered material by sintering the powder mixture.
    Type: Application
    Filed: October 4, 2021
    Publication date: January 27, 2022
    Applicants: Sumitomo Electric Industries, Ltd., Sumitomo Electric Hardmetal Corp.
    Inventors: Katsumi OKAMURA, Yuichiro WATANABE, Akito ISHII, Takashi HARADA, Satoru KUKINO
  • Patent number: 11208358
    Abstract: Provided is a cubic boron nitride sintered body including more than or equal to 85 volume percent and less than 100 volume percent of cubic boron nitride particles, and a remainder of a binder, wherein the binder contains WC, Co, and an Al compound, the binder contains W2Co21B6, and, when IA represents an X-ray diffraction intensity of a (111) plane of the cubic boron nitride particles, IB represents an X-ray diffraction intensity of a (100) plane of the WC, and IC represents an X-ray diffraction intensity of a (420) plane of the W2Co21B6, a ratio IC/IA of the IC to the IA is more than 0 and less than 0.10, and a ratio IC/IB of the IC to the IB is more than 0 and less than 0.40.
    Type: Grant
    Filed: September 18, 2019
    Date of Patent: December 28, 2021
    Assignees: Sumitomo Electric Industries, Ltd., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Katsumi Okamura, Yuichiro Watanabe, Akito Ishii, Takashi Harada, Satoru Kukino
  • Publication number: 20210395153
    Abstract: A cubic boron nitride sintered material includes: more than 80 volume % and less than 100 volume % of cubic boron nitride grains; and more than 0 volume % and less than 20 volume % of a binder phase. The binder phase includes: at least one selected from a group consisting of a simple substance, an alloy, and an intermetallic compound selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, aluminum, silicon, cobalt, and nickel. A dislocation density of the cubic boron nitride grains is more than or equal to 1×1015/m2 and less than or equal to 1×1017/m2.
    Type: Application
    Filed: December 16, 2019
    Publication date: December 23, 2021
    Applicants: Sumitomo Electric Industries, Ltd., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Akito ISHII, Katsumi OKAMURA, Hironari MOROGUCHI, Satoru KUKINO
  • Patent number: 11192827
    Abstract: A sintered material includes a cubic boron nitride, a zirconium-containing oxide, a zirconium-containing nitride, and an aluminum-containing oxide, wherein the zirconium-containing nitride includes both or one of ZrN and ZrON, and the aluminum-containing oxide includes a type Al2O3.
    Type: Grant
    Filed: March 4, 2019
    Date of Patent: December 7, 2021
    Assignees: Sumitomo Electric Industries, Ltd., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Katsumi Okamura, Hisaya Hama, Mayu Amemiya, Satoru Kukino
  • Patent number: 11192826
    Abstract: A sintered material includes a first phase and a second phase, wherein the first phase is composed of cubic boron nitride particles, and the following relational expressions are satisfied when more than or equal to two cubic boron nitride particles adjacent to and in direct contact with each other among the cubic boron nitride particles are defined as a contact body, Di represents a length of an entire perimeter of the contact body, n represents the number of contact locations at which the cubic boron nitride particles are in direct contact with each other, dk represents a length of each of the contact locations, and ?dk (where k=1 to n) represents a total length of the contact locations: Dii=Di+(2×?dk (where k=1 to n)); and [(Dii?Di)/Dii]×100?50.
    Type: Grant
    Filed: February 15, 2018
    Date of Patent: December 7, 2021
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Akito Ishii, Katsumi Okamura
  • Publication number: 20210355036
    Abstract: A cubic boron nitride sintered material includes: more than 80 volume % and less than 100 volume % of cubic boron nitride grains; and more than 0 volume % and less than 20 volume % of a binder phase. The binder phase includes: at least one selected from a group consisting of a simple substance, an alloy, and an intermetallic compound selected from a group consisting of a group 4 element, a group 5 element, a group 6 element in a periodic table, aluminum, silicon, cobalt, and nickel. A dislocation density of the cubic boron nitride grains is more than or equal to 3×1017/m2 and less than or equal to 1×1020/m2.
    Type: Application
    Filed: December 16, 2019
    Publication date: November 18, 2021
    Applicants: Sumitomo Electric Industries, Ltd., Sumitomo Electric Industries, Ltd., SUMITOMO ELECTRIC HARDMETAL CORP., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Akito ISHII, Katsumi OKAMURA, Hironari MOROGUCHI, Satoru KUKINO