Patents by Inventor Yutaka Matsuura
Yutaka Matsuura 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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Publication number: 20060201585Abstract: A rare-earth sintered magnet according to the present invention, of which the main phase is an R2T14B type compound phase, includes: 27 mass % through 32 mass % of R, which is at least one rare-earth element that is selected from the group consisting of Nd, Pr, Tb, and Dy and that always includes at least one of Nd and Pr; 60 mass % through 73 mass % of T, which is either Fe alone or a mixture of Fe and Co; 0.85 mass % through 0.98 mass % of Q, which is either B alone or a mixture of B and C and which is converted-into B on a number of atoms basis when its mass percentage is calculated; more than 0 mass % through 0.3 mass % of Zr; at most 2.0 mass % of an additive element M, which is at least one element selected from the group consisting of Al, Cu, Ga, In and Sn; and inevitably contained impurities.Type: ApplicationFiled: August 10, 2004Publication date: September 14, 2006Inventors: Hiroyuki Tomizawa, Yutaka Matsuura
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Publication number: 20050268989Abstract: An R-T-B based sintered magnet with a reduced B concentration but with sufficiently high coercivity is provided. An R-T-B based sintered magnet according to the present invention has a composition including: 27.0 mass % to 32.0 mass % of R, which is at least one of Nd, Pr, Dy and Tb and which always includes either Nd or Pr; 63.0 mass % to 72.5 mass % of T, which always includes Fe and up to 50% of which is replaceable with Co; 0.01 mass % to 0.08 mass % of Ga; and 0.85 mass % to 0.98 mass % of B.Type: ApplicationFiled: March 10, 2004Publication date: December 8, 2005Inventors: Hiroyuki Tomizawa, Yutaka Matsuura
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Publication number: 20010048665Abstract: A method allowing centralized call control data management and improved maintenance efficiency of call control data for a plurality of call agents distributed in the packet-based network is disclosed. Each of the call agents is set to be a client of a server, which stores master call control data required in respective ones of the call agents and manages the master call control data. Each of the call agents stores a copy of corresponding master call control data so that the call agents perform network-wide call control.Type: ApplicationFiled: June 4, 2001Publication date: December 6, 2001Applicant: NEC CorporationInventor: Yutaka Matsuura
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Patent number: 6277275Abstract: A magnetism applying circuit, which has a construction in which the different polarity ends of a pair of permanent magnets are connected to the respective ends of a yoke having a V-letter shape, is attached to a pipe so as to place the permanent magnets close to the pipe. Therefore, a magnetic fluid treatment apparatus which can reduce magnetic field leakage is formed.Type: GrantFiled: November 2, 1999Date of Patent: August 21, 2001Assignees: Sumitomo Special Metals Co., Ltd.Inventors: Katsutoshi Yoshifusa, Yutaka Matsuura
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Patent number: 5766372Abstract: Magnetic materials comprising Fe, B, R (rare earth elements) and Co having a major phase of Fe--CO--B--R intermetallic compound(s) of tetragonal system, and sintered anisotropic permanent magnets consisting essentially of, by atomic percent, 8-30% R (at least one of rare earth elements inclusive of Y), 2-28% B, no less than 50% Co, and the balance being Fe with impurities. Those may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) providing Fe--Co--B--R--M type materials and magnets.Type: GrantFiled: April 29, 1997Date of Patent: June 16, 1998Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Yutaka Matsuura, Masato Sagawa
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Patent number: 5645651Abstract: Magnetic materials comprising Fe, B, R (rare earth elements) and Co having a major phase of Fe--Co--B--R intermetallic compound(s) of tetragonal systems and sintered anisotropic permanent magnets consisting essentially of, by atomic percent, 8-30% R (at least one of rare earth elements inclusive of Y), 2-28% B, no less than 50% Co, and the balance being Fe with impurities. Those may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) providing Fe--Co--B--R--M type materials and magnets.Type: GrantFiled: June 7, 1995Date of Patent: July 8, 1997Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Yutaka Matsuura, Masato Sagawa
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Patent number: 5527504Abstract: To a fine R-Fe-B alloy powder comprised predominantly of 10-30 atomic % of R (wherein R stands for at least one elements selected from rare earth elements including yttrium), 2-28 atomic % of B, and 65-82 atomic % of Fe in which up to 50 atomic % of Fe may be replaced by Co, at least one boric acid ester compound such as tributyl borate is added as a lubricant in a proportion of 0.01%-2% by weight and mixed uniformly before, during, or after fine grinding of the alloy powder. The resulting powder mixture is compacted by compression molding in a magnetic field and the green compacts are sintered and aged. Compression molding can be performed continuously without need of mold lubrication, and the resulting magnets have improved magnet properties with respect to residual flux density, maximum energy product, and intrinsic coercive force.Type: GrantFiled: May 9, 1995Date of Patent: June 18, 1996Assignees: Sumitomo Metal Industries, Ltd., Sumitomo Special Metals Co. Ltd.Inventors: Yoshihisa Kishimoto, Nobushige Hiraishi, Wataru Takahashi, Masakazu Ohkita, Naoyuki Ishigaki, Yutaka Matsuura
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Patent number: 5486224Abstract: To a fine R--Fe--B alloy powder comprised predominantly of 10-30 atomic % of R (wherein R stands for at least one element selected from rare earth elements including yttrium), 2-28 atomic % of B, and 65-82 atomic % of Fe in which up to 50 atomic % of Fe may be replaced by Co, at least one boric acid ester compound such as tributyl borate is added as a lubricant in a proportion of 0.01%-2% by weight and mixed uniformly before, during, or after fine grinding of the alloy powder. The resulting powder mixture is compacted by compression molding in a magnetic field and the green compacts are sintered and aged. Compression molding can be performed continuously without need of mold lubrication, and the resulting magnets have improved magnet properties with respect to residual flux density, maximum energy product, and intrinsic coercive force.Type: GrantFiled: December 27, 1994Date of Patent: January 23, 1996Assignees: Sumitomo Metal Industries, Ltd., Sumitomo Special Metals Co., Ltd.Inventors: Yoshihisa Kishimoto, Nobushige Hiraishi, Wataru Takahashi, Masakazu Ohkita, Naoyuki Ishigaki, Yutaka Matsuura
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Patent number: 5466308Abstract: Magnetic materials comprising Fe, B, R (rare earth elements) and Co having a major phase of Fe-Co-B-R intermetallic compound(s) of tetragonal systems and sintered anisotropic permanent magnets consisting essentially of, by atomic percent, 8-30% R (at least one of rare earth elements inclusive of Y), 2-28% B, no less than 50% Co, and the balance being Fe with impurities. Those may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) providing Fe-Co-B-R-M type materials and magnets.Type: GrantFiled: February 10, 1994Date of Patent: November 14, 1995Assignee: Sumitomo Special Metals Co. Ltd.Inventors: Setsuo Fujimura, Yutaka Matsuura, Masato Sagawa
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Patent number: 5316595Abstract: Fe-B-R type permanent magnet is produced by: forming an anticorrosive coating film layer on a Fe-B-R base permanent magnet material body by means of vapor deposition to thereby improve the corrosion resistance thereof.The anticorrosive thin film is formed of metal, oxides, nitrides, carbides, borides, silicides, composite compositions thereof, or a mixture thereof. Additionally blasting, shot peening, heat treatment for forming an interdiffusion layer, and/or resin impregnation may be applied.Type: GrantFiled: August 5, 1991Date of Patent: May 31, 1994Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Takaki Hamada, Tetsuji Hayakawa, Yutaka Matsuura
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Patent number: 5230749Abstract: A magnetically anisotropic sintered permanent magnet of the FeCoBR system (R is sum of R.sub.1 and R.sub.2) wherein:R.sub.1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, andR.sub.2 comprises 80 at % or more of Nd and Pr in R.sub.2, and the balance of other rare earth elements exclusive of R.sub.1,said system consisting essentially of, by atomic percent, 0.05 to 5% of R.sub.1, 12.5 to 20% of R, 4 to 20% of B up to 35% of Co, and the balance being Fe. Additional elements M(Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V, W) may be present.Type: GrantFiled: July 8, 1991Date of Patent: July 27, 1993Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura, Hitoshi Yamamoto, Norio Togawa
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Patent number: 5194098Abstract: Magnetic materials comprising Fe, B and R (rare earth elements) having a major phase of an Fe-B-R intermetallic compound which may be a tetragonal system, wherein at least 50 at % of R consists of Nd and/or Pr, and anisotropic sintered permanent magnets consisting essentially of 8-30 at % R, 2028 at %, B and the balance being Fe with impurities. These magnetic materials and permanent magnets may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf), thus providing Fe-B-R-M type materials and magnets.Type: GrantFiled: April 30, 1992Date of Patent: March 16, 1993Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
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Patent number: 5192372Abstract: Isotropic permanent magnet formed of a sintered body having a mean crystal grain size of 1-160 microns and a major phase of tetragonal system comprising, in atomic percent, 10-25% of R wherein R represents at least one of rare-earth elements including Y, 3-23% of B and the balance being Fe. As additional elements M, Al, Ti, V, Cr, Mn, Zr, Hf, Nb, Ta, Mo, Ge, Sb, Sn, Bi, Ni or W may be incorporated.The magnets can be produced through a powder metallurgical process resulting in high magnetic properties, e.g., up to 7 MGOe or higher energy product.Type: GrantFiled: June 18, 1991Date of Patent: March 9, 1993Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura
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Patent number: 5183516Abstract: Magnetic materials comprising Fe, B and R (rare earth elements) having a major phase of an Fe-B-R intermetallic compound which may be a tetragonal system, wherein at least 50 at % of R consists of Nd and/or Pr, and anisotropic sintered permanent magnets consisting essentially of 8-30 at % R, 2-28 at %, B and the balance being Fe with impurities. These magnetic materials and permanent magnets may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf), thus providing Fe-B-R-M type materials and magnets.Type: GrantFiled: April 30, 1992Date of Patent: February 2, 1993Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
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Patent number: 5110377Abstract: A process for producing permanent magnet materials, which comprises the steps of:forming an alloy powder having a mean particle size of 0.3-80 microns and composed of, in atomic percentage, 8-30% R (provided that R is at least one of rare earth elements including Y), 2-28% B, and the balance being Fe and inevitable impurities,sintering the formed body at a temperature of 900.degree.-1200.degree. C.,subjecting the sintered body to a primary heat treatment at a temperature of 750.degree.-1000.degree. C.,then cooling the resultant body to a temperature of no higher than 680.degree. C. at a cooling rate of 3.degree.-2000.degree. C./min, andfurther subjecting the thus cooled body to a secondary heat treatment at a temperature of 480.degree.-700.degree. C.35 MGOe, 40 MGOe or higher energy product can be obtained with specific compositions.Type: GrantFiled: May 14, 1990Date of Patent: May 5, 1992Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Hitoshi Yamamoto, Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
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Patent number: 5096512Abstract: Magnetic materials comprising Fe, B and R (rare earth elements) having a major phase of an Fe-B-R intermetallic compound which may be a tetragonal system, wherein at least 50 at % of R consists of Nd and/or Pr, and anisotropic sintered permanent magnets consisting essentially of 8-30 at % R, 2028 at %, B and the balance being Fe with impurities. These magnetic materials and permanent magnets may contain additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf), thus providing Fe-B-R-M type materials and magnets.Type: GrantFiled: July 26, 1988Date of Patent: March 17, 1992Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
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Patent number: 5089066Abstract: Fe-B-R type permanent magnet is produced by forming an anticorrosive coating film layer on a Fe-B-R base permanent magnet material body by means of vapor deposition to thereby improve the corrosion resistance thereof.The anticorrosive thin film is formed of metal, oxides, nitrides, carbides, borides, silicides, composite compositions thereof, or a mixture thereof. Additionally blasting, shot peening, heat treatment for forming an interdiffusion layer, and/or resin impregnation may be applied.Type: GrantFiled: June 1, 1989Date of Patent: February 18, 1992Assignee: Sumitomo Speical Metals Co., Ltd.Inventors: Takaki Hamada, Tetsuji Hayakawa, Yutaka Matsuura
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Patent number: 4975130Abstract: Permanent magnet materials of the Fe--B--R type are produced by:preparing a metallic powder having a mean particle size of 0.3-80 microns and a composition of 8-30 at % R, 2-28 at % B, and the balance Fe,compacting, andsintering, at a temperature of 900-1200 degrees C. Co up to 50 at % may be present. Additional elements M (Ti, Ni, Bi, V, Nb, Ta, Cr, Mo, W, Mn, Al, Sb, Ge, Sn, Zr, Hf) may be present. The process is applicable for anisotropic and isotropic magnet materials.Type: GrantFiled: May 19, 1987Date of Patent: December 4, 1990Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Yutaka Matsuura, Masato Sagawa, Setsuo Fujimura
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Patent number: 4975129Abstract: A magnetically anisotropic sintered permanent magnet of the FeBR system in which R is sum of R.sub.1 and R.sub.2 wherein:R.sub.1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, andR.sub.2 comprises 80 at % or more of Nd and Pr in R.sub.2 and the balance of at least one of other rare earth elements exclusive of R.sub.1,said system comprising by atomic percent, 0.05 to 5% of R.sub.1, 12.5 to 20% of R, 4 to 20% of B, and the balance being Fe with impurities. Additional elements M(Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V, W,) may be present.Type: GrantFiled: September 27, 1988Date of Patent: December 4, 1990Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura, Hitoshi Yamamoto, Norio Togawa
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Patent number: 4859255Abstract: A magnetically anisotropic sintered permanent magnet of the FeCoBR system (R is sum of R.sub.1 and R.sub.2) wherein:R.sub.1 is Dy, Tb, Gd, Ho, Er, Tm and/or Yb, andR.sub.2 comprises 80 at % or more of Nd and Pr in R.sub.2, and the balance of other rare earth elements exclusive of R.sub.1,said system consisting essentially of, by atomic percent, 0.05 to 5% of R.sub.1, 12.5 to 20% of R, 4 to 20% of B up to 35% of Co, and the balance being Fe. Additional elements M(Ti, Zr, Hf, Cr, Mn, Ni, Ta, Ge, Sn, Sb, Bi, Mo, Nb, Al, V, W) may be present.Type: GrantFiled: February 29, 1988Date of Patent: August 22, 1989Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura, Hitoshi Yamamoto, Norio Togawa