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).

  • Publication number: 20140054275
    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: Application
    Filed: September 16, 2011
    Publication date: February 27, 2014
    Applicants: SUMITOMO ELECTRIC HARDMETAL CORP, SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Kazuo Nakamae, Hiroyuki Murase, Katsuko Yamamoto, Mamoru Ono, Katsuyuki Tanaka, Toshimitsu Sakata, Teruhiro Enami, Yutaka Kobayashi
  • Publication number: 20140026492
    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: Application
    Filed: April 10, 2012
    Publication date: January 30, 2014
    Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventors: Natsuo Tatsumi, Katsuko Yamamoto, Hitoshi Sumiya
  • Publication number: 20120258035
    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: Application
    Filed: August 10, 2011
    Publication date: October 11, 2012
    Inventors: Hitoshi Sumiya, Katsuko Yamamoto, Takeshi Sato, Keiko Arimoto
  • Patent number: 8124553
    Abstract: The composite sintered body of the invention is a composite sintered body, containing 20 volume % or more and 80 volume % or less of cubic boron nitride particles, and a binder; wherein the binder contains at least one selected from the group consisting of nitrides, carbides, borides, and oxides of elements in the group 4a, elements in the group 5a, and elements in the group 6a in the periodic table, and solid solutions thereof, at least one selected from the group consisting of simple substances of Zr, Si, Hf, Ge, W and Co, compounds thereof, and solid solutions thereof, and a compound of Al; and when the composite sintered body contains therein W and/or Co, the total weight of the W and/or Co is less than 2.0 weight % and further the composite sintered body contains therein one or more of the Zr, Si, Hf and Ge (hereinafter referred to as “X”), and when the composite sintered body contains the X, the amount of each of the X is 0.005 weight % or more and less than 2.0 weight %, X/(X+W+Co) is 0.
    Type: Grant
    Filed: January 23, 2008
    Date of Patent: February 28, 2012
    Assignees: Sumitomo Electric Hardmetal Corp., Sumitomo Electric Industries, Ltd.
    Inventors: Katsumi Okamura, Satoru Kukino, Minori Teramoto, Tomohiro Fukaya, Katsuko Yamamoto
  • Publication number: 20100146865
    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: February 5, 2009
    Publication date: June 17, 2010
    Inventors: Takeshi Sato, Katsuko Yamamoto, Naohiro Toda, Hitoshi Sumiya, Yutaka Kobayashi
  • Publication number: 20100099548
    Abstract: The composite sintered body of the invention is a composite sintered body, containing 20 volume % or more and 80 volume % or less of cubic boron nitride particles, and a binder; wherein the binder contains at least one selected from the group consisting of nitrides, carbides, borides, and oxides of elements in the group 4a, elements in the group 5a, and elements in the group 6a in the periodic table, and solid solutions thereof, at least one selected from the group consisting of simple substances of Zr, Si, Hf, Ge, W and Co, compounds thereof, and solid solutions thereof, and a compound of Al; and when the composite sintered body contains therein W and/or Co, the total weight of the W and/or Co is less than 2.0 weight % and further the composite sintered body contains therein one or more of the Zr, Si, Hf and Ge (hereinafter referred to as “X”), and when the composite sintered body contains the X, the amount of each of the X is 0.005 weight % or more and less than 2.0 weight %, X/(X+W+Co) is 0.
    Type: Application
    Filed: January 23, 2008
    Publication date: April 22, 2010
    Inventors: Katsumi Okamura, Satoru Kukino, Minori Teramoto, Tomohiro Fukata, Katsuko Yamamoto
  • Patent number: 6270898
    Abstract: A conductive polycrystalline diamond film having specific resistance of at least 1×10−4 &OHgr;cm and less than 1×103 &OHgr;cm, whose film thickness is in the range of at least 0.1 &mgr;m and not more than 500 &mgr;m, is film-formed by vapor-phase synthesis on a surface employed for pressure bonding, a surface opposite to this surface or at least two side surfaces intersecting with these surfaces on a substrate of a bonding tool tip that is applicable for bonding and packaging a semiconductor chip.
    Type: Grant
    Filed: November 18, 1998
    Date of Patent: August 7, 2001
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Katsuko Yamamoto, Takahisa Iguchi, Yoshiaki Kumazawa, Katsuyuki Tanaka, Hiromu Shiomi, Takashi Tsuno, Naoji Fujimori