Patents by Inventor Tadao Nomura

Tadao Nomura 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: 20200203069
    Abstract: A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound (R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e) or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.
    Type: Application
    Filed: February 26, 2020
    Publication date: June 25, 2020
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Publication number: 20200194170
    Abstract: A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound (R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e) or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.
    Type: Application
    Filed: February 26, 2020
    Publication date: June 18, 2020
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Publication number: 20200194171
    Abstract: A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound (R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e) or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.
    Type: Application
    Filed: February 26, 2020
    Publication date: June 18, 2020
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Patent number: 10614952
    Abstract: A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound (R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e) or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: April 7, 2020
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Patent number: 10167573
    Abstract: A method of producing a SiC single crystal includes: disposing a SiC seed crystal at a bottom part inside a graphite crucible; causing a solution containing Si, C and R (R is at least one selected from the rare earth elements inclusive of Sc and Y) or X (X is at least one selected from the group consisting of Al, Ge, Sn, and transition metals exclusive of Sc and Y) to be present in the crucible; supercooling the solution so as to cause the SiC single crystal to grow on the seed crystal; and adding powdery or granular Si and/or SiC raw material to the solution from above the graphite crucible while keeping the growth of the SiC single crystal.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: January 1, 2019
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Tadao Nomura, Norio Yamagata, Takehisa Minowa
  • Patent number: 10160037
    Abstract: A rare earth magnet is prepared by disposing a R1-T-B sintered body comprising a R12T14B compound as a major phase in contact with an R2-M alloy powder and effecting heat treatment for causing R2 element to diffuse into the sintered body. The alloy powder is obtained by quenching a melt containing R2 and M. R1 and R2 are rare earth elements, T is Fe and/or Co, M is selected from B, C, P, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, Hf, Ta, W, Pt, Au, Pb, and Bi.
    Type: Grant
    Filed: August 18, 2014
    Date of Patent: December 25, 2018
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Tadao Nomura, Hiroaki Nagata, Takehisa Minowa
  • Patent number: 10074477
    Abstract: A rare earth sintered magnet is an anisotropic sintered body comprising Nd2Fe14 B crystal phase as primary phase and having the composition R1aTbMcSidBe wherein R1 is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, M is Al, Cu, Zn, In, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, “a” to “e” are 12?a?17, 0?c?10, 0.3?d?7, 5?e?10, and the balance of b, wherein Dy and/or Tb is diffused into the sintered body from its surface.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: September 11, 2018
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Yuuji Gouki, Kazuaki Sakaki, Tadao Nomura, Koichi Hirota, Hajime Nakamura
  • Publication number: 20170186534
    Abstract: A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound (R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e) or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.
    Type: Application
    Filed: March 9, 2017
    Publication date: June 29, 2017
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Publication number: 20170098503
    Abstract: A rare earth sintered magnet is an anisotropic sintered body comprising Nd2Fe14 B crystal phase as primary phase and having the composition R1aTbMcSidBe wherein R1 is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, M is Al, Cu, Zn, In, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, “a” to “e” are 12?a?17, 0?c?10, 0.3?d?7, 5?e?10, and the balance of b, wherein Dy and/or Tb is diffused into the sintered body from its surface.
    Type: Application
    Filed: December 12, 2016
    Publication date: April 6, 2017
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Yuuji Gouki, Kazuaki Sakaki, Tadao Nomura, Koichi Hirota, Hajime Nakamura
  • Patent number: 9044810
    Abstract: A rare earth magnet is prepared by disposing a R1-T-B sintered body comprising a R12T14B compound as a major phase in contact with an R2-M alloy powder and effecting heat treatment for causing R2 element to diffuse into the sintered body. The alloy powder is obtained by quenching a melt containing R2 and M. R1 and R2 are rare earth elements, T is Fe and/or Co, M is selected from B, C, P, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, Hf, Ta, W, Pt, Au, Pb, and Bi.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: June 2, 2015
    Assignee: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Tadao Nomura, Hiroaki Nagata, Takehisa Minowa
  • Publication number: 20150093501
    Abstract: A rare earth magnet is prepared by disposing a R1-T-B sintered body comprising a R12T14B compound as a major phase in contact with an R2-M alloy powder and effecting heat treatment for causing R2 element to diffuse into the sintered body. The alloy powder is obtained by quenching a melt containing R2 and M. R1 and R2 are rare earth elements, T is Fe and/or Co, M is selected from B, C, P, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, Hf, Ta, W, Pt, Au, Pb, and Bi.
    Type: Application
    Filed: August 18, 2014
    Publication date: April 2, 2015
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Tadao Nomura, Hiroaki Nagata, Takehisa Minowa
  • Publication number: 20130271248
    Abstract: A rare earth sintered magnet as an anisotropic sintered body comprising Nd2Fe14B crystal phase as primary phase and having the composition R1aTbMcSidBe wherein R1 is a rare earth element inclusive of Sc and Y, T is Fe and/or Co, H is Al, Cu, Zn, In, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta, or W, “a” to “e” are 12?a?17, 0?c?10, 0.3?d?7, 5?e?10, and the balance of b, wherein Dy and/or Tb is diffused into the sintered body from its surface.
    Type: Application
    Filed: April 11, 2013
    Publication date: October 17, 2013
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Yuuji Gouki, Kazuaki Sakaki, Tadao Nomura, Koichi Hirota, Hajime Nakamura
  • Patent number: 8557057
    Abstract: A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: October 15, 2013
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Publication number: 20120280775
    Abstract: A sintered magnet body (RaT1bMcBd) coated with a powder mixture of an intermetallic compound R1iM1j, R1xT2yM1z, R1iM1jHk), alloy (M1dM2e)or metal (M1) powder and a rare earth (R2) oxide is diffusion treated. The R2 oxide is partially reduced during the diffusion treatment, so a significant amount of R2 can be introduced near interfaces of primary phase grains within the magnet through the passages in the form of grain boundaries. The coercive force is increased while minimizing a decline of remanence.
    Type: Application
    Filed: May 1, 2012
    Publication date: November 8, 2012
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Patent number: 8277578
    Abstract: A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: October 2, 2012
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Patent number: 8252123
    Abstract: A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: August 28, 2012
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Publication number: 20120132130
    Abstract: A method of producing a SiC single crystal includes: disposing a SiC seed crystal at a bottom part inside a graphite crucible; causing a solution containing Si, C and R (R is at least one selected from the rare earth elements inclusive of Sc and Y) or X (X is at least one selected from the group consisting of Al, Ge, Sn, and transition metals exclusive of Sc and Y) to be present in the crucible; supercooling the solution so as to cause the SiC single crystal to grow on the seed crystal; and adding powdery or granular Si and/or SiC raw material to the solution from above the graphite crucible while keeping the growth of the SiC single crystal.
    Type: Application
    Filed: November 21, 2011
    Publication date: May 31, 2012
    Applicant: SHIN-ETSU CHEMICAL CO., LTD.
    Inventors: Tadao Nomura, Norio Yamagata, Takehisa Minowa
  • Patent number: 8025744
    Abstract: A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.
    Type: Grant
    Filed: March 17, 2008
    Date of Patent: September 27, 2011
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa
  • Publication number: 20110191016
    Abstract: Map data is disclosed. The map data includes a multilink information list, a road information list and an offset information list. The multilink information list stores fixed-length multilink information elements while multilinks are prescribed in such manner that when groups of links have the same attribute, the groups are collectively defined as a same multilink. Each multilink information element indicates a number of links contained in a corresponding multilink. The road information list stores therein road information elements each indicative of road information of a corresponding multilinks. The offset information list stores therein fixed-length offset information elements each indicative of location of a corresponding road information elements in the road information.
    Type: Application
    Filed: January 26, 2011
    Publication date: August 4, 2011
    Applicant: DENSO CORPORATION
    Inventors: Tadao NOMURA, Takayuki Matsunaga
  • Patent number: 7985303
    Abstract: A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.
    Type: Grant
    Filed: October 27, 2010
    Date of Patent: July 26, 2011
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Hiroaki Nagata, Tadao Nomura, Takehisa Minowa