Patents by Inventor Hitoshi Kunugi

Hitoshi Kunugi 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: 20190176242
    Abstract: In the surface-coated cutting tool, a Ti compound layer containing at least nitrogen and carbon is formed on a surface of cutting tool substrate, a nitrogen concentration in the Ti compound layer, in a case of being measured in a direction perpendicular to the surface of the cutting tool substrate in a vicinity of a cutting edge, gradually increases as a distance from cutting tool substrate increases within a range of 0.20 ?m from the surface of the cutting tool substrate toward the Ti compound layer, an average concentration gradient of the nitrogen concentration is 20 at %/?m or more and 300 at %/?m or less, and an average nitrogen concentration in the Ti compound layer in the vicinity of the cutting edge is lower than an average nitrogen concentration in the Ti compound layer at a position of a flank face away from the cutting edge by 3 at % or more.
    Type: Application
    Filed: August 7, 2017
    Publication date: June 13, 2019
    Inventors: Akihiro Murakami, Hitoshi Kunugi
  • Patent number: 6638571
    Abstract: The present invention relates to a coated cemented carbide cutting tool member, which includes: a substrate and a hard coating layer deposited on the substrate, wherein the hard coating layer has an average thickness of 3 to 25 &mgr;m and includes: (1) at least one layer having an average thickness of 0.1 to 5 &mgr;m and including a granular Ti compound selected from the group including TiC, TiN, TiCN, Ti2O3, TiCO, TiNO, TiCNO and mixtures thereof; (2) a TiCN layer having an average thickness is 2 to 15 &mgr;m and including a longitudinal growth crystal structure; and (3) an Al2O3 layer having an average thickness of 0.5 to 8 &mgr;m; wherein the TiCN layer includes a growth direction and a compositional gradient of carbon and nitrogen along the growth direction.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: October 28, 2003
    Assignee: Mitsubishi Materials Corporation
    Inventors: Yoshio Hirakawa, Tetsuhiko Honma, Hitoshi Kunugi, Toshiaki Ueda
  • Publication number: 20020086147
    Abstract: The present invention relates to a coated cemented carbide cutting tool member, which includes:
    Type: Application
    Filed: October 29, 2001
    Publication date: July 4, 2002
    Applicant: Mitsubishi Materials Corporation
    Inventors: Yoshio Hirakawa, Tetsuhiko Honma, Hitoshi Kunugi, Toshiaki Ueda
  • Patent number: 6338894
    Abstract: The present invention relates to a coated cemented carbide cutting tool member, which includes: a substrate and a hard coating layer deposited on the substrate, wherein the hard coating layer has an average thickness of 3 to 25 &mgr;m and includes: (1) at least one layer having an average thickness of 0.1 to 5 &mgr;m and including a granular Ti compound selected from the group including TiC, TiN, TiCN, Ti2O3, TiCO, TiNO, TiCNO and mixtures thereof; (2) a TiCN layer having an average thickness is 2 to 15 &mgr;m and including a longitudinal growth crystal structure; and (3) an Al2O2 layer having an average thickness of 0.5 to 8 &mgr;m; wherein the TiCN layer includes a growth direction and a compositional gradient of carbon and nitrogen along the growth direction.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: January 15, 2002
    Assignee: Mitsubishi Materials Corporation
    Inventors: Yoshio Hirakawa, Tetsuhiko Honma, Hitoshi Kunugi, Toshiaki Ueda
  • Patent number: 5066553
    Abstract: There is disclosed a surface-coated tool member of tungsten carbide based cemented carbide which has a tungsten carbide based cemented carbide substrate and a hard coating formed on the substrate. The hard coating may have one or more layers each of which is made of one material selected from the group consisting of carbide, nitride and oxide of metals in groups IV.sub.A, V.sub.A and VI.sub.A of the Periodic Table; solid solution of said carbide, nitride and oxide; and aluminum oxide. The cobalt content of the substrate in a surface portion at a depth of about 2 .mu.m from a surface thereof is less than that in an interior portion at a depth of about 100 .mu.m from said surface by at least 10%.
    Type: Grant
    Filed: April 10, 1990
    Date of Patent: November 19, 1991
    Assignee: Mitsubishi Metal Corporation
    Inventors: Hironori Yoshimura, Yoshihiro Sawada, Kei Nakahara, Hitoshi Kunugi, Keiichi Sakurai