Patents by Inventor Setsuo Fujimura
Setsuo Fujimura 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).
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
Patent number: 5167914Abstract: An (Fe, Co)-B-R tetragonal type magnet having a high corrosion resistance, which has a boundary phase stabilized by Co and Al against corrosion, and which consists essentially of:0.2-3.0 at % Dy and 12-17 at % of the sum of Nd and Dy;5-10 at % B;0.5-13 at % Co;0.5-4 at % Al; andthe balance being at least 65 at % Fe.0.1-1.0 at % of Ti and/or Nb may be present. Alloy powders therefor can be also stabilized.Type: GrantFiled: May 22, 1991Date of Patent: December 1, 1992Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Hitoshi Yamamoto, Satoshi Hirosawa
-
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
-
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
-
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
-
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
-
Patent number: 4898613Abstract: A rare earth alloy for producing permanent magnet comprised of: 15-65 atomic % R.sub.1, 35-83 atomic % Fe, and 0-15 atomic % B, where R.sub.1 represents at least one of heavy rare earth elements Gd, Tb, Dy, Ho, Er, Tm and Yb. This alloy is produced by reducing a mixture of corresponding rare earth oxides, Fe, and a boron containing material by Ca, contacting the reduced mass with water, and treating the resultant slurry with water. Using this alloy, Fe-B-R base magnets wherein R.sub.1 is substituted for part of R (R representing lanthanide and/or Y) having a high performance are produced with a reduced cost.Type: GrantFiled: January 20, 1988Date of Patent: February 6, 1990Assignee: Sumitomo Special Metals Co. Ltd.Inventors: Naoyuki Ishigaki, Takaki Hamada, Setsuo Fujimura
-
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
-
Patent number: 4840684Abstract: 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, Zv, 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: December 30, 1983Date of Patent: June 20, 1989Assignee: Sumitomo Special Metals Co, Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura
-
Patent number: 4826546Abstract: 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: August 13, 1987Date of Patent: May 2, 1989Assignee: Sumitomo Special Metal Co., Ltd.Inventors: Hitoshi Yamamoto, Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
-
Patent number: 4792368Abstract: 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: July 25, 1983Date of Patent: December 20, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
-
Patent number: 4773950Abstract: 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 15, 1983Date of Patent: September 27, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Setsuo Fujimura, Masato Sagawa, Yutaka Matsuura, Hitoshi Yamamoto, Norio Togawa
-
Patent number: 4770723Abstract: Magnetic materials comprising Fe, B and R (rare earth elements) having a major phase of Fe--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 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--B--R--M type materials and magnets.Type: GrantFiled: February 10, 1987Date of Patent: September 13, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Masato Sagawa, Setsuo Fujimura, Yutaka Matsuura
-
Patent number: 4770702Abstract: A rare earth-iron-boron alloy powder which consists essentially of:12.5 to 20 at % R wherein R.sub.1 is 0.05 to 5 at %, 4 to 20 at % B, and 60 to 83.5 at % Fe,wherein R.sub.1 is at least one heavy rare earth element selected from the group consisting of Gd, Tb, Dy, Ho, Er, Tm and Yb, 80 to 100 at % of R.sub.2 consists of Nd and/or Pr, the balance in the R.sub.2 being at least one element selected from the group consisting of rare earth elements including Y and except for R.sub.1, and R=R.sub.1 =R.sub.2 by atomic %, wherein a major phase of at least 80 vol % of the entire alloy coinsists of a tetragonal structure, and wherein oxygen does not exceed 10,000 ppm, carbon does not exceed 1000 ppm and calcium does not exceed 2000 ppm. The alloy powder is produced by directly reducing a mixture comprising rare earth oxide, iron and other ingredients or oxide thereof with a reducing agent Ca and CaCl.sub.2, putting the reduced product into water, then treating with water. Up to 35 at % Co may be substituted for Fe.Type: GrantFiled: January 20, 1988Date of Patent: September 13, 1988Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Naoyuki Ishigaki, Takaki Hamada, Setsuo Fujimura