Patents by Inventor Keisuke Ayabe
Keisuke Ayabe 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: 10672543Abstract: A ferrite powder for bonded magnets capable of producing a ferrite bonded magnet having high BHmax, and excellent in fluidity when converted to a compound, and having a high p-iHc value, and a method for producing the same, and a ferrite bonded magnet using the ferrite powder for bonded magnets, wherein an average particle size of particles obtained by a dry laser diffraction measurement is 5 ?m or less; a specific surface area is 1.90 m2/g or more and less than 2.80 m2/g; a compression density is 3.50 g/cm3 or more and less than 3.78 g/cm3, and a compressed molding has a coercive force of 2300 Oe or more and less than 2800 Oe.Type: GrantFiled: September 30, 2015Date of Patent: June 2, 2020Assignees: DOW A ELECTRONICS MATERIALS CO., LTD., DOW A F-TEC CO., LTD.Inventors: Satoru Tsuboi, Yasunobu Mishima, Keisuke Ayabe, Masayasu Senda
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Patent number: 10665371Abstract: A ferrite powder for bonded magnets having a high iHc value usable even in a low temperature environment, a method for producing the same, and a bonded magnet using the ferrite powder and having high iHc value which can be used even in a low temperature environment, wherein a specific surface area is 2.20 m2/g or more and less than 3.20 m2/g; a compression density is 3.30 g/cm3 or more and less than 3.60 g/cm3, and a compressed molding has a coercive force of 3250 Oe or more and less than 3800 Oe.Type: GrantFiled: September 30, 2015Date of Patent: May 26, 2020Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA F-TEC CO., LTD.Inventors: Satoru Tsuboi, Yasunobu Mishima, Keisuke Ayabe, Masayasu Senda
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Patent number: 10453596Abstract: There is provided a ferrite powder for bonded magnets capable of producing ferrite bonded magnets with high BHmax, excellent in MFR when converted to a compound, with high p-iHc, wherein an average particle size of particles obtained by a dry laser diffraction measurement is 5 ?m or less, a specific surface area is 1.90 m2/g or more and less than 3.00 m2/g, a compression density is 3.40 g/cm3 or more and less than 3.73 g/cm3, and a compressed molding has a coercive force of 2800 Oe or more and less than 3250 Oe.Type: GrantFiled: September 30, 2015Date of Patent: October 22, 2019Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA F-TEC CO., LTD.Inventors: Satoru Tsuboi, Yasunobu Mishima, Keisuke Ayabe, Masayasu Senda
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Publication number: 20180244537Abstract: A ferrite powder for bonded magnets capable of producing a ferrite bonded magnet having a BHmax value of 2.65 MGOe or more when molded in a magnetic field and a method for producing the same, and a ferrite bonded magnet using the same, wherein a compression density is 3.50 g/cm3 or more, and an average value of a (long axis length/short axis length) ratio of ferrite particles having a long axis length of 1.0 ?m or more is, 1.60 or less.Type: ApplicationFiled: February 23, 2016Publication date: August 30, 2018Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA F-TEC CO., LTD.Inventors: Tomoya YAMADA, Satoru TSUBOI, Keisuke AYABE, Yasunobu MISHIMA, Masayasu SENDA
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Publication number: 20170316857Abstract: There is provided a ferrite powder for bonded magnets capable of producing ferrite bonded magnets with high BHmax, excellent in MFR when converted to a compound, with high p-iHc, wherein an average particle size of particles obtained by a dry laser diffraction measurement is 5 ?m or less, a specific surface area is 1.90 m2/g or more and less than 3.00 m2/g, a compression density is 3.40 g/cm3 or more and less than 3.73 g/cm3, and a compressed molding has a coercive force of 2800 Oe or more and less than 3250 Oe.Type: ApplicationFiled: September 30, 2015Publication date: November 2, 2017Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA F-TEC CO., LTD.Inventors: Satoru TSUBOI, Yasunobu MISHIMA, Keisuke AYABE, Masayasu SENDA
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Publication number: 20170309381Abstract: A ferrite powder for bonded magnets capable of producing a ferrite bonded magnet having high BHmax, and excellent in fluidity when converted to a compound, and having a high p-iHc value, and a method for producing the same, and a ferrite bonded magnet using the ferrite powder for bonded magnets, wherein an average particle size of particles obtained by a dry laser diffraction measurement is 5 ?m or less; a specific surface area is 1.90 m2/g or more and less than 2.80 m2/g; a compression density is 3.50 g/cm3 or more and less than 3.78 g/cm3, and a compressed molding has a coercive force of 2300 Oe or more and less than 2800 Oe.Type: ApplicationFiled: September 30, 2015Publication date: October 26, 2017Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA F-TEC CO., LTD.Inventors: Satoru TSUBOI, Yasunobu MISHIMA, Keisuke AYABE, Masayasu SENDA
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Publication number: 20170301440Abstract: A ferrite powder for bonded magnets having a high iHc value usable even in a low temperature environment, a method for producing the same, and a bonded magnet using the ferrite powder and having high iHc value which can be used even in a low temperature environment, wherein a specific surface area is 2.20 m2/g or more and less than 3.20 m2/g; a compression density is 3.30 g/cm3 or more and less than 3.60 g/cm3, and a compressed molding has a coercive force of 3250 Oe or more and less than 3800 Oe.Type: ApplicationFiled: September 30, 2015Publication date: October 19, 2017Applicants: DOWA ELECTRONICS MATERIALS CO., LTD., DOWA F-TEC CO., LTD.Inventors: Satoru TSUBOI, Yasunobu MISHIMA, Keisuke AYABE, Masayasu SENDA
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Patent number: 9460850Abstract: To provide ferrite magnetic powders for bond magnet capable of surely suppressing residual hexavalent chrome, being an environmental load substance, having no adverse influence on the magnetic characteristics, which is an obstacle in use, and without damaging productivity and at a low cost. The method includes the steps of obtaining sintered powders by sintering raw material powders; wet-pulverizing the sintered powders; wet-cleaning the sintered powders; and annealing the cleaned sintered powders, wherein in the step of the wet-pulverization and in the step of wet-cleaning, generation of the hexavalent chrome, being an environmental load substance, is suppressed by performing the pulverization and cleaning while maintaining pH of a dispersion solvent at 8.5 or less, at the time of pulverization and cleaning.Type: GrantFiled: April 17, 2014Date of Patent: October 4, 2016Assignees: DOWA F-TEC CO., LTD., DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Shuichi Kohayashi, Hiroya Ikeda, Hideki Katayama, Keisuke Ayabe
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Patent number: 8986181Abstract: Provided is a module for automatic tool exchange device of novel structure wherein electric signals can be transmitted with high reliability while preventing transmission efficiency from deteriorating between a first coupling member and a second coupling member. An electromagnetic shielding member is arranged on an outer circumference of a core member except for a transmission surface, a gap member having electromagnetic shielding effect lower than that of the electromagnetic shielding member is interposed between the core member and the electromagnetic shielding member, and a first module and a second module are provided, respectively, with coil units equipped with coil heads which are constituted to include a coil member, the core member and the gap member.Type: GrantFiled: July 23, 2009Date of Patent: March 24, 2015Assignees: Mie Electronics Co., Ltd., Honda Motor Co., Ltd.Inventors: Shuhei Takazakura, Atsushi Deguchi, Shinya Sasaki, Toshikazu Mukai, Tomimasa Yamashita, Shinji Yahiro, Atsushi Miyabe, Keisuke Ayabe, Takashi Fujimura
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Patent number: 8951635Abstract: A bonded magnet is required to have a large energy product, which is the product of magnetization Br and coercive force Hc. However, in a ferrite powder for a bonded magnet, when the particle diameter is reduced to improve the coercive force, the packing properties are impaired, and the Br is lowered. When the particle diameter is increased to improve the magnetization, the coercive force is lowered. Therefore, to increase the energy product, both the Br and Hc must be increased. A ferrite powder that has a large particle size, is composed of smooth crystals, and suffers only a small reduction in coercive force even after pressurization is obtained by mixing a fine ferrite powder having a small particle size with a ferrite powder calcined at a temperature of 1050° C. to 1300° C. in the presence of a chloride at its saturated vapor pressure and then annealing the mixture at 800° C. to 1100° C. A bonded magnet produced using the powder has an energy product of 2.0 MGOe or more.Type: GrantFiled: April 9, 2010Date of Patent: February 10, 2015Assignee: Dowa Electronics Materials Co., Ltd.Inventors: Shinichi Suenaga, Kouji Hirata, Satoru Tsuboi, Keisuke Ayabe, Kazuyosi Horii
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Publication number: 20140225316Abstract: To provide ferrite magnetic powders for bond magnet capable of surely suppressing residual hexavalent chrome, being an environmental load substance, having no adverse influence on the magnetic characteristics, which is an obstacle in use, and without damaging productivity and at a low cost. The method includes the steps of obtaining sintered powders by sintering raw material powders; wet-pulverizing the sintered powders; wet-cleaning the sintered powders; and annealing the cleaned sintered powders, wherein in the step of the wet-pulverization and in the step of wet-cleaning, generation of the hexavalent chrome, being an environmental load substance, is suppressed by performing the pulverization and cleaning while maintaining pH of a dispersion solvent at 8.5 or less, at the time of pulverization and cleaning.Type: ApplicationFiled: April 17, 2014Publication date: August 14, 2014Applicants: DOWA F-TEC CO., LTD., DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Shuichi KOHAYASHI, Hiroya IKEDA, Hideki KATAYAMA, Keisuke AYABE
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Publication number: 20120015189Abstract: A bonded magnet is required to have a large energy product, which is the product of magnetization Br and coercive force Hc. However, in a ferrite powder for a bonded magnet, when the particle diameter is reduced to improve the coercive force, the packing properties are impaired, and the Br is lowered. When the particle diameter is increased to improve the magnetization, the coercive force is lowered. Therefore, to increase the energy product, both the Br and Hc must be increased. A ferrite powder that has a large particle size, is composed of smooth crystals, and suffers only a small reduction in coercive force even after pressurization is obtained by mixing a fine ferrite powder having a small particle size with a ferrite powder calcined at a temperature of 1050° C. to 1300° C. in the presence of a chloride at its saturated vapor pressure and then annealing the mixture at 800° C. to 1100° C. A bonded magnet produced using the powder has an energy product of 2.0 MGOe or more.Type: ApplicationFiled: April 9, 2010Publication date: January 19, 2012Applicant: DOWA Electronics Materials Co., Ltd.Inventors: Shinichi Suenaga, Kouji Hirata, Satoru Tsuboi, Keisuke Ayabe, Kazuyosi Horii
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Publication number: 20110256995Abstract: Provided is a module for automatic tool exchange device of novel structure wherein electric signals can be transmitted with high reliability while preventing transmission efficiency from deteriorating between a first coupling member and a second coupling member. An electromagnetic shielding member is arranged on an outer circumference of a core member except for a transmission surface, a gap member having electromagnetic shielding effect lower than that of the electromagnetic shielding member is interposed between the core member and the electromagnetic shielding member, and a first module and a second module are provided, respectively, with coil units equipped with coil heads which are constituted to include a coil member, the member and the gap member.Type: ApplicationFiled: July 23, 2009Publication date: October 20, 2011Applicants: HONDA MOTOR CO., LTD., MIE ELECTRONICS CO., LTD.Inventors: Shuhei Takazakura, Atsushi Deguchi, Shinya Sasaki, Toshikazu Mukai, Tomimasa Yamashita, Shinji Yahiro, Atsushi Miyabe, Keisuke Ayabe, Takashi Fujimura
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Publication number: 20100230630Abstract: To provide ferrite magnetic powders for bond magnet capable of surely suppressing residual hexavalent chrome, being an environmental load substance, having no adverse influence on the magnetic characteristics, which is an obstacle in use, and without damaging productivity and at a low cost. The method includes the steps of obtaining sintered powders by sintering raw material powders; wet-pulverizing the sintered powders; wet-cleaning the sintered powders; and annealing the cleaned sintered powders, wherein in the step of the wet-pulverization and in the step of wet-cleaning, generation of the hexavalent chrome, being an environmental load substance, is suppressed by performing the pulverization and cleaning while maintaining pH of a dispersion solvent at 8.5 or less, at the time of pulverization and cleaning.Type: ApplicationFiled: March 6, 2007Publication date: September 16, 2010Applicants: DOWA F-TEC CO., LTD., DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Shuichi Kohayashi, Hiroya Ikeda, Hideki Katayama, Keisuke Ayabe
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Patent number: 7384571Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkaline-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 ?m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 ?m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: GrantFiled: February 6, 2007Date of Patent: June 10, 2008Assignees: Dowa Electronics Materials Co., Ltd., Nippon Bengara Kogyo Co., Ltd.Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai
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Patent number: 7255807Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkaline-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 ?m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 ?m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: GrantFiled: April 22, 2004Date of Patent: August 14, 2007Assignee: Dowa Mining Co., Ltd.Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai
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Publication number: 20070131893Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkaline-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 ?m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 ?m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: ApplicationFiled: February 6, 2007Publication date: June 14, 2007Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai
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Publication number: 20040212472Abstract: A ferrite magnetic powder for bond magnet that experiences only small decrease in coercivity when molded into a bond magnet is provided, which is a ferrite magnetic powder that includes an alkali-earth metal constituent and exhibits a decrease in coercivity of not greater than 600 Oe when subjected to a prescribed molding test. The magnetic powder can be obtained by mixing a fine ferrite powder of an average particle diameter of greater than 0.50 to 1.0 &mgr;m and a coarse ferrite powder of an average particle diameter of greater than 2.50 to 5.0 &mgr;m at ratio to incorporate the fine powder at a content ratio of 15-40 wt %.Type: ApplicationFiled: April 22, 2004Publication date: October 28, 2004Inventors: Masayasu Senda, Shinichi Suenaga, Keisuke Ayabe, Toshiyuki Sakai