Patents by Inventor Makoto Nakane
Makoto Nakane 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).
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Patent number: 11710587Abstract: An R-T-B based permanent magnet in which R is a rare earth element, T is Fe and Co, and B is boron. R at least includes Dy. The R-T-B based permanent magnet includes M, and M is at least one or more elements selected from the group consisting of Cu, Ga, Al, Mn, Zr, Ti, Cr, Ni, Nb, Ag, Hf, Ta, W, Si, Bi, and Sn. M at least includes Cu. A total content of R is 28.0 mass % to 30.2 mass %, a content of Dy is 1.0 mass % to 6.5 mass %, a content of Cu is 0.04 mass % to 0.50 mass %, a content of Co is 0.5 mass % to 3.0 mass %, and a content of B is 0.85 mass % to 0.95 mass %.Type: GrantFiled: November 28, 2018Date of Patent: July 25, 2023Assignee: TDK CORPORATIONInventors: Hiroshi Doto, Kiyoyuki Masuzawa, Makoto Nakane
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Patent number: 11232889Abstract: An A R-T-B based permanent magnet, wherein R is a rare earth element, T is Fe and Co, and B is boron. R at least includes Dy and Tb. The R-T-B based permanent magnet includes M, and M is one or more elements selected from the group made of Cu, Ga, Al, Mn, Zr, Ti, Cr, Ni, Nb, Ag, Hf, Ta, W, Si, Bi, and Sn. M at least includes Cu. A total content of R is 28.05 mass % to 30.60 mass %, a content of Dy is 1.0 mass % to 6.5 mass %, a content of Cu is 0.04 mass % to 0.50 mass %, a content of Co is 0.5 mass % to 3.0 mass %, and a content of B is 0.85 mass % to 0.95 mass %. A concentration distribution of Tb decreases from an outer side towards an inner side of the R-T-B based permanent magnet.Type: GrantFiled: November 28, 2018Date of Patent: January 25, 2022Assignee: TDK CORPORATIONInventors: Hiroshi Doto, Kiyoyuki Masuzawa, Makoto Nakane
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Patent number: 10672544Abstract: An object of the present invention is to provide an R-T-B based permanent magnet showing high residual magnetic flux density Br and coercive force HcJ. Provided is an R-T-B based permanent magnet in which, R is a rare earth element, T is an element other than the rare earth element, B, C, O or N, and B is boron. R at least includes Tb and T at least includes Fe, Cu, Co and Ga, and a total of R content is 28.05 to 30.60 mass %, Cu content is 0.04 to 0.50 mass %, Co content is 0.5 to 3.0 mass %, Ga content is 0.08 to 0.30 mass %, and B content is 0.85 to 0.95 mass %, relative to 100 mass % of a total mass of R, T and B, and Tb concentration reduces from outside to inside of the R-T-B based permanent magnet.Type: GrantFiled: December 6, 2017Date of Patent: June 2, 2020Assignee: TDK CORPORATIONInventors: Kiyoyuki Masusawa, Makoto Nakane
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Patent number: 10672545Abstract: An object of the present invention is to provide an R-T-B based permanent magnet showing high residual magnetic flux density Br and coercive force HcJ, and further showing the same also after heavy rare earth element is diffused along grain boundaries. Provided is an R-T-B based permanent magnet in which, R is a rare earth element, T is an element other than the rare earth element, B, C, O or N, and B is boron. T at least includes Fe, Cu, Co and Ga, and a total of R content is 28.0 to 30.2 mass %, Cu content is 0.04 to 0.50 mass %, Co content is 0.5 to 3.0 mass %, Ga content is 0.08 to 0.30 mass %, and B content is 0.85 to 0.95 mass %, relative to 100 mass % of a total mass of R, T and B.Type: GrantFiled: December 6, 2017Date of Patent: June 2, 2020Assignee: TDK CORPORATIONInventors: Kiyoyuki Masusawa, Makoto Nakane
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Publication number: 20190172616Abstract: An R-T-B based permanent magnet in which R is a rare earth element, T is Fe and Co, and B is boron. R at least includes Dy. The R-T-B based permanent magnet includes M, and M is at least one or more elements selected from the group consisting of Cu, Ga, Al, Mn, Zr, Ti, Cr, Ni, Nb, Ag, Hf, Ta, W, Si, Bi, and Sn. M at least includes Cu. A total content of R is 28.0 mass % to 30.2 mass %, a content of Dy is 1.0 mass % to 6.5 mass %, a content of Cu is 0.04 mass % to 0.50 mass %, a content of Co is 0.5 mass % to 3.0 mass %, and a content of B is 0.85 mass % to 0.95 mass %.Type: ApplicationFiled: November 28, 2018Publication date: June 6, 2019Applicant: TDK CORPORATIONInventors: Hiroshi DOTO, Kiyoyuki MASUZAWA, Makoto NAKANE
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Publication number: 20190172615Abstract: An A R-T-B based permanent magnet, wherein R is a rare earth element, T is Fe and Co, and B is boron. R at least includes Dy and Tb. The R-T-B based permanent magnet includes M, and M is one or more elements selected from the group made of Cu, Ga, Al, Mn, Zr, Ti, Cr, Ni, Nb, Ag, Hf, Ta, W, Si, Bi, and Sn. M at least includes Cu. A total content of R is 28.05 mass % to 30.60 mass %, a content of Dy is 1.0 mass % to 6.5 mass %, a content of Cu is 0.04 mass % to 0.50 mass %, a content of Co is 0.5 mass % to 3.0 mass %, and a content of B is 0.85 mass % to 0.95 mass %. A concentration distribution of Tb decreases from an outer side towards an inner side of the R-T-B based permanent magnet.Type: ApplicationFiled: November 28, 2018Publication date: June 6, 2019Applicant: TDK CORPORATIONInventors: Hiroshi DOTO, Kiyoyuki MASUZAWA, Makoto NAKANE
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Publication number: 20180158582Abstract: An object of the present invention is to provide an R-T-B based permanent magnet showing high residual magnetic flux density Br and coercive force HcJ. Provided is an R-T-B based permanent magnet in which, R is a rare earth element, T is an element other than the rare earth element, B, C, O or N, and B is boron. R at least includes Tb and T at least includes Fe, Cu, Co and Ga, and a total of R content is 28.05 to 30.60 mass %, Cu content is 0.04 to 0.50 mass %, Co content is 0.5 to 3.0 mass %, Ga content is 0.08 to 0.30 mass %, and B content is 0.85 to 0.95 mass %, relative to 100 mass % of a total mass of R, T and B, and Tb concentration reduces from outside to inside of the R-T-B based permanent magnet.Type: ApplicationFiled: December 6, 2017Publication date: June 7, 2018Applicant: TDK CORPORATIONInventors: Kiyoyuki MASUSAWA, Makoto NAKANE
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Publication number: 20180158583Abstract: An object of the present invention is to provide an R-T-B based permanent magnet showing high residual magnetic flux density Br and coercive force HcJ, and further showing the same also after heavy rare earth element is diffused along grain boundaries. Provided is an R-T-B based permanent magnet in which, R is a rare earth element, T is an element other than the rare earth element, B, C, O or N, and B is boron. T at least includes Fe, Cu, Co and Ga, and a total of R content is 28.0 to 30.2 mass %, Cu content is 0.04 to 0.50 mass %, Co content is 0.5 to 3.0 mass %, Ga content is 0.08 to 0.30 mass %, and B content is 0.85 to 0.95 mass %, relative to 100 mass % of a total mass of R, T and B.Type: ApplicationFiled: December 6, 2017Publication date: June 7, 2018Applicant: TDK CORPORATIONInventors: Kiyoyuki MASUSAWA, Makoto NAKANE
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Patent number: 8152936Abstract: There is provided a rare earth magnet with excellent Br and HcJ values. The rare earth magnet according to a preferred embodiment of the invention is characterized by being composed mainly of R (where R is at least one element selected from among rare earth elements including Y), B, Al, Cu, Zr, Co, O, C and Fe, wherein the content of each element is R: 25-34 wt %, B: 0.85-0.98 wt %, Al: 0.03-0.3 wt %, Cu: 0.01-0.15 wt %, Zr: 0.03-0.25 wt %, Co: ?3 wt % (but not 0 wt %), O: ?0.2 wt %, C: 0.03-0.15 wt % and Fe: remainder.Type: GrantFiled: June 27, 2008Date of Patent: April 10, 2012Assignee: TDK CorporationInventors: Taeko Tsubokura, Makoto Iwasaki, Makoto Nakane, Fumitaka Baba
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Publication number: 20100233016Abstract: There is provided a rare earth magnet with excellent Br and HcJ values. The rare earth magnet according to a preferred embodiment of the invention is characterized by being composed mainly of R (where R is at least one element selected from among rare earth elements including Y), B, Al, Cu, Zr, Co, O, C and Fe, wherein the content of each element is R: 25-34 wt %, B: 0.85-0.98 wt %, Al: 0.03-0.3 wt %, Cu: 0.01-0.15 wt %, Zr: 0.03-0.25 wt %, Co: ?3 wt % (but not 0 wt %), O: ?0.2 wt %, C: 0.03-0.15 wt % and Fe: remainder.Type: ApplicationFiled: June 27, 2008Publication date: September 16, 2010Applicant: TDK CorporationInventors: Taeko Tsubokura, Makoto Iwasaki, Makoto Nakane, Fumitaka Baba
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Publication number: 20100129538Abstract: The invention provides a process for producing a magnet that not only allows satisfactory Br and HcJ values to be achieved but can also yield a magnet with a sufficiently large squareness ratio. The process for producing a magnet according to the invention is characterized by comprising a first step in which a heavy rare earth compound containing a heavy rare earth element is adhered onto a rare earth magnet sintered compact, and a second step in which the heavy rare earth compound-adhered sintered compact is subjected to heat treatment. The heavy rare earth compound is a hydride of the heavy rare earth element.Type: ApplicationFiled: March 31, 2008Publication date: May 27, 2010Applicant: TDK CORPORATIONInventors: Ryota Kunieda, Makoto Nakane, Fumitaka Baba, Makoto Iwasaki, Satoshi Tanaka, Hideki Nakamura
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Patent number: 7465363Abstract: A single phase consisting of a ThMn12 phase can be obtained by having the composition thereof represented by a general formula R(Fe100-y-wCowTiy)xSizAv (in the general formula, R is at least one element selected from rare earth elements (here the rare earth elements signify a concept inclusive of Y), Nd accounts for 50 mol % or more of R, and A is N and/or C) in which the molar ratios in the general formula are such that x=10 to 12.5, y=(8.3?1.7×z) to 12.3, z=0.1 to 2.3, v=0.1 to 3 and w=0 to 30, and the relation (Fe+Co+Ti+Si)/R>12 is satisfied.Type: GrantFiled: January 28, 2004Date of Patent: December 16, 2008Assignee: TDK CorporationInventors: Atsushi Sakamoto, Makoto Nakane, Hideki Nakamura, Akira Fukuno
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Publication number: 20060169360Abstract: A single phase consisting of a ThMn12 phase can be obtained by having the composition thereof represented by a general formula R(Fe100-y-wCowTiy)xSizAv (in the general formula, R is at least one element selected from rare earth elements (here the rare earth elements signify a concept inclusive of Y), Nd accounts for 50 mol % or more of R, and A is N and/or C) in which the molar ratios in the general formula are such that x=10 to 12.5, y=(8.3?1.7×z) to 12.3, z=0.1 to 2.3, v=0.1 to 3 and w=0 to 30, and the relation (Fe+Co+Ti+Si)/R>12 is satisfied.Type: ApplicationFiled: January 28, 2004Publication date: August 3, 2006Inventors: Atsushi Sakamoto, Makoto Nakane, Hideki Nakamura, Akira Fukuno
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Patent number: 6833036Abstract: A rare earth permanent magnet consists of 20-40 wt % of at least one rare earth element R, 0.5-4.5 wt % of boron B, 0.03-0.5 wt % of M (at least one of Al, Cu, Sn and Ga), 0.01-0.2 wt % of Bi, and the balance being at least one transition metal element T.Type: GrantFiled: June 27, 2002Date of Patent: December 21, 2004Assignee: TDK CorporationInventors: Makoto Nakane, Eiji Kato, Chikara Ishizaka, Akira Fukuno
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Publication number: 20030141951Abstract: A rare earth permanent magnet consists of 20-40 wt % of at least one rare earth element R, 0.5-4.5 wt % of boron B, 0.03-0.5 wt % of M (at least one of Al, Cu, Sn and Ga), 0.01-0.2 wt % of Bi, and the balance being at least one transition metal element T.Type: ApplicationFiled: June 27, 2002Publication date: July 31, 2003Inventors: Makoto Nakane, Eiji Kato, Chikara Ishizaka, Akira Fukuno