Patents by Inventor Shuhei Okumura
Shuhei Okumura 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: 20150010460Abstract: The present invention provides a method of producing a carbon material for lithium ion secondary battery negative electrode, the carbon material containing a plurality of carbon particles, the method comprising the steps of: preparing a resin dispersion material containing a dispersion medium and a plurality of resin particles which are substantially insoluble in the dispersion medium; ejecting a plurality of liquid droplets of the resin dispersion material using a liquid droplet ejecting method, the liquid droplets each containing the dispersion medium and at least one of the resin particles; and heat-treating the plurality of liquid droplets so that the resin particle contained in each liquid droplet is carbonized while removing the dispersion medium to thereby obtain at least one of the carbon particles from each liquid droplet.Type: ApplicationFiled: February 26, 2013Publication date: January 8, 2015Applicant: SUMITOMO BAKELITE CO., LTD.Inventors: Takeshi Takeuchi, Shuhei Okumura, Toru Kamata, Yoshimasa Yokota
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Patent number: 7045092Abstract: A perpendicular pressing/compacting method for a rare-earth alloy powder is provided to produce a sintered magnet with excellent magnetic properties. A method for pressing a rare-earth alloy powder by using a die is provided. The die is made of a non-magnetic material and has a die hole to define a cavity and a pair of yoke members provided on both sides of the cavity. The method includes the steps of: providing the rare-earth alloy powder; filling the cavity of the die with the rare-earth alloy powder; and compressing the rare-earth alloy powder, loaded in the cavity, between a pair of opposed press surfaces. A pulse magnetic field substantially perpendicular to a compressing direction is not applied until the apparent density of the rare-earth alloy powder in the cavity reaches a predetermined value, at least equal to 47% of the true density thereof, while the compressing step is being carried out.Type: GrantFiled: April 4, 2003Date of Patent: May 16, 2006Assignee: Neomax Co., Ltd.Inventors: Atsushi Ogawa, Shuhei Okumura
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Patent number: 7025930Abstract: In a process for handling green compacts made from a rare earth metal-based magnetic alloy powder by a press machine to slide, on a sintering support plate, the green compacts, the support plate used has a surface roughness degree Ra in a range of 0.6 to 47 ?m. At a first step, the green compacts are disposed in a first position near a final transport position, and at a second step, the said green compacts disposed in the first position are slid on the sintering support plate and disposed in the final transport position. Thus, by using the support plate having a surface roughness degree in a particular range, the green compacts made from the rare earth metal-based magnetic alloy powder can be sintered without occurrence of the deposition of the green compacts to the support plate, the chipping of the green compacts and the like. In addition, the efficiency of operation of the press machine can be increased.Type: GrantFiled: February 4, 2003Date of Patent: April 11, 2006Assignee: Neomax Co. Ltd.Inventors: Shuhei Okumura, Hiroshi Hashikawa
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Patent number: 7014440Abstract: A method and apparatus for manufacturing a rare earth magnet is disclosed. In a first step, a compact is produced by compacting rare earth alloy powder in a predetermined space in an orienting magnetic field. Next, a demagnetizing process is performed for the compact, and the compact is ejected from the predetermined space. Then, a additional demagnetizing process is performed for magnetic powder adhering to a surface of the compact by applying an magnetic field to the compact after the compact is ejected.Type: GrantFiled: June 12, 2003Date of Patent: March 21, 2006Assignee: Neomax Co., Ltd.Inventors: Shuhei Okumura, Akira Nakamura
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Publication number: 20040241033Abstract: A perpendicular pressing/compacting method for a rare-earth alloy powder is provided to produce a sintered magnet with excellent magnetic properties. A method for pressing a rare-earth alloy powder by using a die is provided. The die is made of a non-magnetic material and has a die hole to define a cavity and a pair of yoke members provided on both sides of the cavity. The method includes the steps of: providing the rare-earth alloy powder; filling the cavity of the die with the rare-earth alloy powder; and compressing the rare-earth alloy powder, loaded in the cavity, between a pair of opposed press surfaces. A pulse magnetic field substantially perpendicular to a compressing direction is not applied until the apparent density of the rare-earth alloy powder in the cavity reaches a predetermined value, at least equal to 47% of the true density thereof, while the compressing step is being carried out.Type: ApplicationFiled: March 12, 2004Publication date: December 2, 2004Inventors: Atsushi Ogawa, Shuhei Okumura
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Patent number: 6779995Abstract: In a rare earth metal-based alloy powder supplying apparatus, a rare earth metal-based alloy powder is supplied from a feeder box having an opening in its bottom surface into a cavity by moving the feeder box to above the cavity. The apparatus includes a bar-shaped member which is moved horizontally and in parallel in the bottom of the feeder box. A plurality of the bar-shaped members may be provided horizontally at distances. The apparatus further includes a powder replenishing device for sequentially replenishing the alloy powder into the feeder box in an amount corresponding to a decrement in amount resulting from the supplying of the alloy powder from the feeder box to the cavity, an inert gas supply device for filling an inert gas into said powder feeder box, and a plate member made of a fluorine-contained resin and mounted on the bottom surface of the feeder box.Type: GrantFiled: August 6, 2002Date of Patent: August 24, 2004Assignee: Neomax Co., Ltd.Inventors: Seiichi Kohara, Shuhei Okumura, Akira Nakamura
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Publication number: 20030209842Abstract: A method and apparatus for manufacturing a rare earth magnet is disclosed. In a first step, a compact is produced by compacting rare earth alloy powder in a predetermined space in an orienting magnetic field. Next, a demagnetizing process is performed for the compact, and the compact is ejected from the predetermined space. Then, a additional demagnetizing process is performed for magnetic powder adhering to a surface of the compact by applying an magnetic field to the compact after the compact is ejected.Type: ApplicationFiled: June 12, 2003Publication date: November 13, 2003Applicant: SUMITOMO SPECIAL METALS CO., LTD.Inventors: Shuhei Okumura, Akira Nakamura
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Patent number: 6602352Abstract: A method and apparatus for manufacturing a rare earth magnet is disclosed. In a first step, a compact is produced by compacting rare earth alloy powder in a predetermined space in an orienting magnetic field. Next, a demagnetizing process is performed for the compact, and the compact is ejected from the predetermined space. Then, a additional demagnetizing process is performed for magnetic powder adhering to a surface of the compact by applying an magnetic field to the compact after the compact is ejected.Type: GrantFiled: June 27, 2001Date of Patent: August 5, 2003Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Shuhei Okumura, Akira Nakamura
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Publication number: 20030143100Abstract: In a process for handling green compacts made from a rare earth metal-based magnetic alloy powder by a press machine to slide, on a sintering support plate, the green compacts, the support plate used has a surface roughness degree Ra in a range of 0.6 to 47 &mgr;m. At a first step, the green compacts are disposed in a first position near a final transport position, and at a second step, the said green compacts disposed in the first position are slid on the sintering support plate and disposed in the final transport position. Thus, by using the support plate having a surface roughness degree in a particular range, the green compacts made from the rare earth metal-based magnetic alloy powder can be sintered without occurrence of the deposition of the green compacts to the support plate, the chipping of the green compacts and the like. In addition, the efficiency of operation of the press machine can be increased.Type: ApplicationFiled: February 4, 2003Publication date: July 31, 2003Applicant: SUMITOMO SPECIAL METALS CO., LTD.Inventors: Shuhei Okumura, Hiroshi Hashikawa
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Publication number: 20030084964Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.Type: ApplicationFiled: November 13, 2002Publication date: May 8, 2003Applicant: SUMITOMO SPECIAL METALS CO., LTD.Inventors: Katsumi Okayama, Naoyuki Ishigaki, Shuhei Okumura
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Patent number: 6537385Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.Type: GrantFiled: July 9, 2002Date of Patent: March 25, 2003Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Katsumi Okayama, Naoyuki Ishigaki, Shuhei Okumura
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Patent number: 6537488Abstract: In a process for handling green compacts made from a rare earth metal-based magnetic alloy powder by a press machine to slide, on a sintering support plate, the green compacts, the support plate used has a surface roughness degree Ra in a range of 0.6 to 47 &mgr;m. At a first step, the green compacts are disposed in a first position near a final transport position, and at a second step, the said green compacts disposed in the first position are slid on the sintering support plate and disposed in the final transport position. Thus, by using the support plate having a surface roughness degree in a particular range, the green compacts made from the rare earth metal-based magnetic alloy powder can be sintered without occurrence of the deposition of the green compacts to the support plate, the chipping of the green compacts and the like. In addition, the efficiency of operation of the press machine can be increased.Type: GrantFiled: November 15, 1999Date of Patent: March 25, 2003Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Shuhei Okumura, Hiroshi Hashikawa
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Publication number: 20030000600Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.Type: ApplicationFiled: July 9, 2002Publication date: January 2, 2003Applicant: Sumitomo Special Metals Co., Ltd.Inventors: Katsumi Okayama, Naoyuki Ishigaki, Shuhei Okumura
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Publication number: 20020197180Abstract: A green compact of a rare earth alloy magnetic powder is made by pressing the powder. The powder is pressed within an air environment that has a temperature controlled at 30° C. or less and a relative humidity controlled at 65% or less.Type: ApplicationFiled: August 21, 2002Publication date: December 26, 2002Applicant: SUMITOMO SPECIAL METALS CO., LTD.Inventors: Koki Tokuhara, Shuhei Okumura, Akiyasu Oota
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Publication number: 20020185793Abstract: In a rare earth metal-based alloy powder supplying apparatus, a rare earth metal-based alloy powder is supplied from a feeder box having an opening in its bottom surface into a cavity by moving the feeder box to above the cavity. The apparatus includes a bar-shaped member which is moved horizontally and in parallel in the bottom of the feeder box. A plurality of the bar-shaped members may be provided horizontally at distances. The apparatus further includes a powder replenishing device for sequentially replenishing the alloy powder into the feeder box in an amount corresponding to a decrement in amount resulting from the supplying of the alloy powder from the feeder box to the cavity, an inert gas supply device for filling an inert gas into said powder feeder box, and a plate member made of a fluorine-contained resin and mounted on the bottom surface of the feeder box.Type: ApplicationFiled: August 6, 2002Publication date: December 12, 2002Applicant: SUMITOMO SPECIAL METALS CO., LTD.Inventors: Seiichi Kohara, Shuhei Okumura, Akira Nakamura
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Patent number: 6491765Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.Type: GrantFiled: May 9, 2001Date of Patent: December 10, 2002Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Katsumi Okayama, Naoyuki Ishigaki, Shuhei Okumura
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Patent number: 6481993Abstract: In a rare earth metal-based alloy powder supplying apparatus, a rare earth metal-based alloy powder is supplied from a feeder box having an opening in its bottom surface into a cavity by moving the feeder box to above the cavity. The apparatus includes a bar-shaped member which is moved horizontally and in parallel in the bottom of the feeder box. A plurality of the bar-shaped members may be provided horizontally at distances. The apparatus further includes a powder replenishing device for sequentially replenishing the alloy powder into the feeder box in an amount corresponding to a decrement in amount resulting from the supplying of the alloy powder from the feeder box to the cavity, an inert gas supply device for filling an inert gas into said powder feeder box, and a plate member made of a fluorine-contained resin and mounted on the bottom surface of the feeder box.Type: GrantFiled: September 26, 2000Date of Patent: November 19, 2002Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Seiichi Kohara, Shuhei Okumura, Akira Nakamura
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Patent number: 6461565Abstract: A green compact of a rare earth alloy magnetic powder is made by pressing the powder. The powder is pressed within an air environment that has a temperature controlled at 30° C. or less and a relative humidity controlled at 65% or less.Type: GrantFiled: March 8, 2001Date of Patent: October 8, 2002Assignee: Sumitomo Special Metals Co., Ltd.Inventors: Koki Tokuhara, Shuhei Okumura, Akiyasu Oota
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Publication number: 20020020470Abstract: A method and apparatus for manufacturing a rare earth magnet is disclosed. In a first step, a compact is produced by compacting rare earth alloy powder in a predetermined space in an orienting magnetic field. Next, a demagnetizing process is performed for the compact, and the compact is ejected from the predetermined space. Then, a additional demagnetizing process is performed for magnetic powder adhering to a surface of the compact by applying an magnetic field to the compact after the compact is ejected.Type: ApplicationFiled: June 27, 2001Publication date: February 21, 2002Inventors: Shuhei Okumura, Akira Nakamura
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Publication number: 20020020469Abstract: The method for manufacturing alloy powder for R—Fe—B type rare earth magnets of the present invention includes a first pulverization step of coarsely pulverizing a material alloy for rare earth magnets and a second pulverization step of finely pulverizing the material alloy. In the first pulverization step, the material alloy is pulverized by a hydrogen pulverization method. In the second pulverization step, easily oxidized super-fine powder (particle size: 1.0 &mgr;m or less) is removed to adjust the particle quantity of the super-fine powder to 10% or less of the particle quantity of the entire powder.Type: ApplicationFiled: May 9, 2001Publication date: February 21, 2002Inventors: Katsumi Okayama, Naoyuki Ishigaki, Shuhei Okumura