Patents by Inventor Katsuko Yamamoto

Katsuko Yamamoto 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: 9850135
    Abstract: Nano polycrystalline diamond is composed of carbon and a plurality of impurities other than carbon. A concentration of each of the plurality of impurities is not higher than 0.01 mass %, and the nano polycrystalline diamond has a crystal grain size (a maximum length) not greater than 500 nm. The nano polycrystalline diamond can be fabricated by preparing graphite in which a concentration of an impurity is not higher than 0.01 mass % and converting graphite to diamond by applying an ultra-high pressure and a high temperature to graphite.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: December 26, 2017
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazuhiro Ikeda, Keiko Arimoto, Katsuko Yamamoto, Hitoshi Sumiya
  • Patent number: 9714197
    Abstract: Nano polycrystalline diamond is composed of carbon, an element of different type which is an element other than carbon and is added to be dispersed in carbon at an atomic level, and an inevitable impurity. The polycrystalline diamond has a crystal grain size not greater than 500 nm. The polycrystalline diamond can be fabricated by subjecting graphite in which the element of different type which is an element other than carbon has been added to be dispersed in carbon at an atomic level to heat treatment within high-pressure press equipment.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: July 25, 2017
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Kazuhiro Ikeda, Keiko Arimoto, Katsuko Yamamoto, Hitoshi Sumiya, Takeshi Sato
  • Patent number: 9663371
    Abstract: A polycrystalline diamond body contains diamond particles. The diamond particles have a mean particle size of 50 nm or less. As a result of measurement of a knoop hardness under a test load of 4.9 N at 23° C.±5° C., the polycrystalline diamond body has a ratio of a length B of a shorter diagonal line with respect to a length A of a longer diagonal line of diagonal lines of a knoop indentation, expressed as a B/A ratio, of 0.080 or less. This polycrystalline diamond body is tough and has a small particle size.
    Type: Grant
    Filed: May 7, 2015
    Date of Patent: May 30, 2017
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yuh Ishida, Katsuko Yamamoto, Hitoshi Sumiya
  • Patent number: 9630853
    Abstract: An object is to provide polycrystalline diamond applicable to diverse applications; and a water jet orifice, a stylus for gravure printing, a scriber, a diamond cutting tool, and a scribing wheel that include such polycrystalline diamond. This object is achieved by polycrystalline diamond obtained by converting and sintering non-diamond carbon under an ultrahigh pressure and at a high temperature without addition of a sintering aid or a catalyst, wherein sintered diamond grains constituting the polycrystalline diamond have an average grain diameter of more than 50 nm and less than 2500 nm and a purity of 99% or more, and the diamond has a D90 grain diameter of (average grain diameter+average grain diameter×0.9) or less.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: April 25, 2017
    Assignees: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Takeshi Sato, Katsuko Yamamoto, Naohiro Toda, Hitoshi Sumiya, Yutaka Kobayashi
  • Patent number: 9487446
    Abstract: Provided are a diamond polycrystalline body having a longer life than conventional diamond polycrystalline bodies when it is slid, a method for manufacturing the same, and a tool. In a diamond polycrystalline body, at least one element whose sulfide or chloride has a melting point of less than or equal to 1000° C. is added thereto, and crystal grains have an average grain size of less than or equal to 500 nm. Thereby, wear of diamond can be suppressed, and the diamond polycrystalline body can have a longer life when it is slid.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: November 8, 2016
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takeshi Sato, Katsuko Yamamoto, Kazuhiro Ikeda, Hitoshi Sumiya
  • Patent number: 9487447
    Abstract: Provided are a diamond polycrystalline body having a longer life than conventional diamond polycrystalline bodies when it is slid, a method for manufacturing the same, and a tool. In a diamond polycrystalline body, at least one element whose oxide has a melting point of less than or equal to 1000° C. is added thereto, and crystal grains have an average grain size of less than or equal to 500 nm. Thereby, wear of diamond can be suppressed, and the diamond polycrystalline body can have a longer life when it is slid.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: November 8, 2016
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takeshi Sato, Katsuko Yamamoto, Kazuhiro Ikeda, Hitoshi Sumiya
  • Publication number: 20160272546
    Abstract: Nano polycrystalline diamond is composed of carbon, an element of different type which is an element other than carbon and is added to be dispersed in carbon at an atomic level, and an inevitable impurity. The polycrystalline diamond has a crystal grain size not greater than 500 nm. The polycrystalline diamond can be fabricated by subjecting graphite in which the element of different type which is an element other than carbon has been added to be dispersed in carbon at an atomic level to heat treatment within high-pressure press equipment.
    Type: Application
    Filed: May 27, 2016
    Publication date: September 22, 2016
    Inventors: Kazuhiro Ikeda, Keiko Arimoto, Katsuko Yamamoto, Hitoshi Sumiya, Takeshi Sato
  • Publication number: 20160264422
    Abstract: Nano polycrystalline diamond is composed of carbon, an element of different type which is an element other than carbon and is added to be dispersed in carbon at an atomic level, and an inevitable impurity. The polycrystalline diamond has a crystal grain size not greater than 500 nm. The polycrystalline diamond can be fabricated by subjecting graphite in which the element of different type which is an element other than carbon has been added to be dispersed in carbon at an atomic level to heat treatment within high-pressure press equipment.
    Type: Application
    Filed: May 24, 2016
    Publication date: September 15, 2016
    Inventors: Kazuhiro Ikeda, Keiko Arimoto, Katsuko Yamamoto, Hitoshi Sumiya, Takeshi Sato
  • Patent number: 9415466
    Abstract: Provided is a technology for manufacturing cutting tools that is capable of providing cutting tools that have a cut surface whose surface is uniformly smooth and that have a stable performance.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: August 16, 2016
    Assignees: SUMITOMO ELECTRIC INDUSTRIES, LTD., SUMITOMO ELECTRIC HARDMETAL CORP.
    Inventors: Kazuo Nakamae, Hiroyuki Murase, Katsuko Yamamoto, Mamoru Ono, Katsuyuki Tanaka, Toshimitsu Sakata, Teruhiro Enami, Yutaka Kobayashi
  • Publication number: 20160229696
    Abstract: Nano polycrystalline diamond is composed of carbon and a plurality of impurities other than carbon. A concentration of each of the plurality of impurities is not higher than 0.01 mass %, and the nano polycrystalline diamond has a crystal grain size (a maximum length) not greater than 500 nm. The nano polycrystalline diamond can be fabricated by preparing graphite in which a concentration of an impurity is not higher than 0.01 mass % and converting graphite to diamond by applying an ultra-high pressure and a high temperature to graphite.
    Type: Application
    Filed: April 18, 2016
    Publication date: August 11, 2016
    Inventors: Kazuhiro Ikeda, Katsuko Yamamoto, Hitoshi Sumiya
  • Patent number: 9403215
    Abstract: The present invention provides a cutting tool that achieves cutting with high precision. The cutting tool of the present invention includes a cutting edge composed of a polycrystalline body including high-pressure-phase hard grains that contain one or more elements selected from the group consisting of boron, carbon, and nitrogen, the polycrystalline body being formed by subjecting a non-diamond carbon material and/or boron nitride, serving as a starting material, to direct conversion sintering under ultra-high pressure and high temperature without adding a sintering aid or a catalyst, in which letting the radius of curvature of the nose of the cutting edge of the cutting tool be R1, the sintered grains constituting the polycrystalline body have an average grain size of 1.2×R1 or less and a maximum grain size of 2×R1 or less.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: August 2, 2016
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Natsuo Tatsumi, Katsuko Yamamoto, Hitoshi Sumiya
  • Publication number: 20150321317
    Abstract: A polycrystalline diamond body contains diamond particles. The diamond particles have a mean particle size of 50 nm or less. As a result of measurement of a knoop hardness under a test load of 4.9 N at 23° C.±5° C., the polycrystalline diamond body has a ratio of a length B of a shorter diagonal line with respect to a length A of a longer diagonal line of diagonal lines of a knoop indentation, expressed as a B/A ratio, of 0.080 or less. This polycrystalline diamond body is tough and has a small particle size.
    Type: Application
    Filed: May 7, 2015
    Publication date: November 12, 2015
    Inventors: Yuh ISHIDA, Katsuko YAMAMOTO, Hitoshi SUMIYA
  • Publication number: 20150315087
    Abstract: Provided are a diamond polycrystalline body having a longer life than conventional diamond polycrystalline bodies when it is slid, a method for manufacturing the same, and a tool. In a diamond polycrystalline body, at least one element whose sulfide or chloride has a melting point of less than or equal to 1000° C. is added thereto, and crystal grains have an average grain size of less than or equal to 500 nm. Thereby, wear of diamond can be suppressed, and the diamond polycrystalline body can have a longer life when it is slid.
    Type: Application
    Filed: December 5, 2013
    Publication date: November 5, 2015
    Inventors: Takeshi SATO, Katsuko YAMAMOTO, Kazuhiro IKEDA, Hitoshi SUMIYA
  • Publication number: 20150307404
    Abstract: Provided are a diamond polycrystalline body having a longer life than conventional diamond polycrystalline bodies when it is slid, a method for manufacturing the same, and a tool. In a diamond polycrystalline body, at least one element whose oxide has a melting point of less than or equal to 1000° C. is added thereto, and crystal grains have an average grain size of less than or equal to 500 nm. Thereby, wear of diamond can be suppressed, and the diamond polycrystalline body can have a longer life when it is slid.
    Type: Application
    Filed: December 5, 2013
    Publication date: October 29, 2015
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Takeshi SATO, Katsuko YAMAMOTO, Kazuhiro IKEDA, Hitoshi SUMIYA
  • Publication number: 20150298290
    Abstract: A cubic boron nitride polycrystal includes cubic boron nitride, the cubic boron nitride having an average grain size of not more than 150 nm, a ratio b/a being not more than 0.085 in measurement of Knoop hardness at 23° C.±5° C. under a test load of 4.9 N, the ratio b/a being a ratio between a length a of a longer diagonal line and a length b of a shorter diagonal line of a Knoop indentation.
    Type: Application
    Filed: April 2, 2015
    Publication date: October 22, 2015
    Inventors: Yuh ISHIDA, Katsuko YAMAMOTO, Hitoshi SUMIYA
  • Publication number: 20150274535
    Abstract: An object is to provide polycrystalline diamond applicable to diverse applications; and a water jet orifice, a stylus for gravure printing, a scriber, a diamond cutting tool, and a scribing wheel that include such polycrystalline diamond. This object is achieved by polycrystalline diamond obtained by converting and sintering non-diamond carbon under an ultrahigh pressure and at a high temperature without addition of a sintering aid or a catalyst, wherein sintered diamond grains constituting the polycrystalline diamond have an average grain diameter of more than 50 nm and less than 2500 nm and a purity of 99% or more, and the diamond has a D90 grain diameter of (average grain diameter+average grain diameter×0.9) or less.
    Type: Application
    Filed: June 12, 2015
    Publication date: October 1, 2015
    Inventors: Takeshi SATO, Katsuko YAMAMOTO, Naohiro TODA, Hitoshi SUMIYA, Yutaka KOBAYASHI
  • Patent number: 8784767
    Abstract: Polycrystalline diamond includes cubic diamond and hexagonal diamond, and a ratio of X-ray diffraction peak intensity of a (100) plane of the hexagonal diamond to X-ray diffraction peak intensity for a (111) plane of cubic diamond is not lower than 0.01%. In addition, a present method of manufacturing polycrystalline diamond includes the steps of preparing a non-diamond carbon material having a degree of graphitization not higher than 0.58 and directly converting the non-diamond carbon material to cubic diamond and hexagonal diamond and sintering the non-diamond carbon material, without adding any of a sintering agent and a binder, under pressure and temperature conditions at which diamond is thermodynamically stable.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: July 22, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Hitoshi Sumiya, Katsuko Yamamoto, Takeshi Sato, Keiko Arimoto
  • Publication number: 20140186629
    Abstract: Nano polycrystalline diamond is composed of carbon, an element of different type which is an element other than carbon and is added to be dispersed in carbon at an atomic level, and an inevitable impurity. The polycrystalline diamond has a crystal grain size not greater than 500 nm. The polycrystalline diamond can be fabricated by subjecting graphite in which the element of different type which is an element other than carbon has been added to be dispersed in carbon at an atomic level to heat treatment within high-pressure press equipment.
    Type: Application
    Filed: July 26, 2012
    Publication date: July 3, 2014
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kazuhiro Ikeda, Keiko Arimoto, Katsuko Yamamoto, Hitoshi Sumiya, Takeshi Sato
  • Publication number: 20140170055
    Abstract: Nano polycrystalline diamond is composed of carbon and a plurality of impurities other than carbon. A concentration of each of the plurality of impurities is not higher than 0.01 mass %, and the nano polycrystalline diamond has a crystal grain size (a maximum length) not greater than 500 nm. The nano polycrystalline diamond can be fabricated by preparing graphite in which a concentration of an impurity is not higher than 0.01 mass % and converting graphite to diamond by applying an ultra-high pressure and a high temperature to graphite.
    Type: Application
    Filed: July 26, 2012
    Publication date: June 19, 2014
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kazuhiro Ikeda, Keiko Arimoto, Katsuko Yamamoto, Hitoshi Sumiya
  • Patent number: 8747798
    Abstract: Polycrystalline diamond includes cubic diamond and hexagonal diamond, and a ratio of X-ray diffraction peak intensity of a (100) plane of the hexagonal diamond to X-ray diffraction peak intensity for a (111) plane of cubic diamond is not lower than 0.01%. In addition, a present method of manufacturing polycrystalline diamond includes the steps of preparing a non-diamond carbon material having a degree of graphitization not higher than 0.58 and directly converting the non-diamond carbon material to cubic diamond and hexagonal diamond and sintering the non-diamond carbon material, without adding any of a sintering agent and a binder, under pressure and temperature conditions at which diamond is thermodynamically stable.
    Type: Grant
    Filed: August 10, 2011
    Date of Patent: June 10, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Hitoshi Sumiya, Katsuko Yamamoto, Takeshi Sato, Keiko Arimoto