Patents by Inventor Shuichi Kohayashi
Shuichi Kohayashi 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: 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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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: 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: 7434981Abstract: A metal paste, in which a filler mainly composed of metal is mixed with good dispersibility, is manufactured with good productivity at a low cost without generating a foil of the metal. A paste-like material (referred to as a paste material hereafter) containing a metal filler is fed into a gap between a pair of rotating whetstones 11 and 12 which are relatively rotated while facing with each other having a specified gap therebetween, to pass and discharge therein. The paste material is thus kneaded and dispersed. In addition, the paste material is kneaded and dispersed by suppressing the generation of a metal foil, adjusting the gap to a specified interval dg and feeding the paste material into the interval while applying thereon a predetermined positive pressure and/or negative pressure.Type: GrantFiled: May 26, 2005Date of Patent: October 14, 2008Assignee: DOWA Electronics Materials Co., Ltd.Inventors: Kazuyoshi Amasaki, Shuichi Kohayashi, Yoshikazu Omoto
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Patent number: 7394024Abstract: An oxide superconductor current lead in which generation of Joule heat at joint portions with a system side conductor and a power supply side conductor is reduced with use of an oxide superconductor with less heat penetration into a super conducting equipment system is provided.Type: GrantFiled: February 5, 2004Date of Patent: July 1, 2008Assignees: Dowa Mining Co., Ltd., Chubu Electric Power Co., Inc.Inventors: Shuichi Kohayashi, Kazuyuki Uemura, Shigeo Nagaya, Naoji Kashima
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Patent number: 7319195Abstract: A composite conductor suitable as a connecting conductor that includes a superconductor and is capable of reducing the generation of Joule heat in a joint part between the system side and power-supply sides of a superconductor apparatus. A composite conductor 10 includes a superconductor 12 provided continuously in the flowing direction of the electric current, and a metal conductor 11 joined with the superconductor 12 and provided at least at a joint part with mating conductors 50, 60 to be joined, wherein the electric current is fed and received between the metal conductor 11 and the mating conductors 50, 60 by joining the metal conductor 11 and the mating conductors 50, 60, and wherein the superconductor 12 is arranged in the metal conductor 11 so as to be approximately parallel to the joint surface (joint interface) between the metal conductor 11 and the mating conductors 50,60.Type: GrantFiled: November 24, 2004Date of Patent: January 15, 2008Assignee: Dowa Electronics Materials Co., Ltd.Inventors: Shuichi Kohayashi, Kazuyuki Uemura, Shigeo Nagaya, Naoji Kashima
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Publication number: 20060292383Abstract: To provide a metal-coated substrate capable of significantly improving an adhesion strength and stability between metal and a plastic film. By laminating a thermoplastic film layer 2 on a base body plastic film layer 3 to obtain a laminated plastic film, and a metal layer 1 is formed on the thermoplastic film layer 2, while controlling a temperature of the laminated plastic film.Type: ApplicationFiled: November 25, 2004Publication date: December 28, 2006Inventors: Shuichi Kohayashi, Akio Sawabe, Yukihiro Kitamura
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Publication number: 20060093838Abstract: A metal substrate having high strength and stability of adhesion between a metal film and a plastic film, wherein the metal film can be made thin. The plastic film as a base is placed inside a device for applying a silane coupling agent and is dried at a temperature of 300° C., after which the vaporized silane coupling agent is blown onto the plastic film while the temperature is maintained at 300° C., and the surface of the plastic film is coated with the silane coupling agent. A film of copper is formed by sputtering on the surface of the plastic film thus coated with the coupling agent, and the plastic film provided with the sputtered copper film is coated with a glossy copper coating having the desired thickness using a plating method.Type: ApplicationFiled: September 21, 2005Publication date: May 4, 2006Applicant: Dowa Mining Co., Ltd.Inventors: Shuichi Kohayashi, Akio Sawabe, Yukihiro Kitamura
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Publication number: 20060021788Abstract: To provide a composite conductor suitable as a connecting conductor capable of reducing generation of Joule heat in a joint part between a conductor on a system side and a conductor on a power-supply side, while using a superconductor with less thermal invasion to a superconductive apparatus system. A composite conductor 10 comprises a superconductor 12 provided continuously in the flowing direction of the electric current, and a metal conductor 11 joined with the superconductor 12 and provided at least at a joint part with mating conductors 50, 60 to be joined, wherein the electric current is fed and received between the metal conductor 11 and the mating conductors 50, 60 by joining the metal conductor 11 and the mating conductors 50, 60, and wherein the superconductor 12 is arranged in the metal conductor 11 so as to be approximately parallel to the joint surface (joint interface) between the metal conductor 11 and the mating conductors 50, 60.Type: ApplicationFiled: November 24, 2004Publication date: February 2, 2006Applicants: DOWA MINING CO., LTD., CHUBU ELECTRIC POWER CO., INC.Inventors: Shuichi Kohayashi, Kazuyuki Uemura, Shigeo Nagaya, Naoji Kashima
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Publication number: 20050267243Abstract: A metal paste, in which a filler mainly composed of metal is mixed with good dispersibility, is manufactured with good productivity at a low cost without generating a foil of the metal. A paste-like material (referred to as a paste material hereafter) containing a metal filler is fed into a gap between a pair of rotating whetstones 11 and 12 which are relatively rotated while facing with each other having a specified gap therebetween, to pass and discharge therein. The paste material is thus kneaded and dispersed. In addition, the paste material is kneaded and dispersed by suppressing the generation of a metal foil, adjusting the gap to a specified interval dg and feeding the paste material into the interval while applying thereon a predetermined positive pressure and/or negative pressure.Type: ApplicationFiled: May 26, 2005Publication date: December 1, 2005Applicant: DOWA MINING CO., LTD.Inventors: Kazuyoshi Amasaki, Shuichi Kohayashi, Yoshikazu Omoto
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Publication number: 20050061423Abstract: A manufacturing method of a metal clad film capable of reducing a manufacturing cost without going through troublesome steps such as forming a carrier layer and melting and removing it. On a surface of a stainless belt-like base material 1 moving in a circulatory manner, a metal thin film 2 is formed in plating baths 24 to 25 of a metal thin film forming part 20, and in a plastic clad part 30, a plastic film layer 3 is formed on the metal thin film 2. In a peeling off part 40, a base material 1 is peeled off at a boundary surface between the base material 1 and the metal thin film 2. Whereby, the metal thin film 2 is transferred on the plastic film layer 3, and a metal clad film 5 having the metal thin film 2 on the plastic film layer 3 is obtained.Type: ApplicationFiled: August 11, 2004Publication date: March 24, 2005Applicant: DOWA MINING CO., LTD.Inventor: Shuichi Kohayashi
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Publication number: 20040222011Abstract: An oxide superconductor current lead in which generation of Joule heat at joint portions with a system side conductor and a power supply side conductor is reduced with use of an oxide superconductor with less heat penetration into a super conducting equipment system is provided.Type: ApplicationFiled: February 5, 2004Publication date: November 11, 2004Applicants: DOWA MINING CO., LTD., CHUBU ELECTRIC POWER CO., LTD.Inventors: Shuichi Kohayashi, Kazuyuki Uemura, Shigeo Nagaya, Naoji Kashima
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Patent number: 6172007Abstract: An oxide superconductor which exhibits an uniform and high critical current is disclosed. Further, a method of manufacturing this oxide superconductor is disclosed, namely, a RE—Ba—Cu—O oxide superconductor (RE is one or more kinds of rare earth elements including Y) by performing a treatment, which includes at least a burning process to be performed in a range of temperatures that are higher than a melting point of a raw material mixture containing a RE-compound raw material, Ba-compound raw material and a Cu-compound raw material, on the raw material mixture. This method further includes a step of crushing the raw material mixture into particles and establishing the mean particle diameter of one or all of the raw materials as ranging from 50 to 80 &mgr;m.Type: GrantFiled: December 14, 1998Date of Patent: January 9, 2001Assignee: Dowa Mining Co., Ltd.Inventors: Kazuya Yamaguchi, Shuichi Kohayashi, Shuetsu Haseyama, Shuji Yoshizawa
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Patent number: 6103670Abstract: An oxide superconductor which has high mechanical strength and exhibits favorable magnetic properties and high resistance to environment. Further, a method of manufacturing this oxide superconductor, namely, a method of manufacturing a RE--Ba--Cu--O oxide superconductor (RE is one or more kinds of rare earth elements including Y) by performing a treatment, which includes at least a burning process to be performed in a range of temperatures that are higher than the melting point of a raw material mixture containing a RE-compound raw material, a Ba-compound raw material and a Cu-compound raw material, on the aforesaid raw material mixture. This method further comprises the addition step of adding 1 to 30 in percent by weight (wt %) of Ag to the raw material mixture, and the crystallization step of melting the raw material mixture, to which Ag is added, at a temperature that is not lower than a temperature at which the raw material mixture is decomposed and fused into the RE.sub.2 BaCuO.sub.Type: GrantFiled: April 16, 1999Date of Patent: August 15, 2000Assignees: Dowa Mining Co., Ltd., Chubu Electric Power Co., Inc.Inventors: Shuichi Kohayashi, Shuetsu Haseyama, Shuji Yoshizawa, Shigeo Nagaya
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Patent number: 5958840Abstract: An oxide superconductor which has high mechanical strength and exhibits favorable magnetic properties and high resistance to environment. Further, a method of manufacturing this oxide superconductor, namely, a method of manufacturing a RE--Ba--Cu--O oxide superconductor (RE is one or more kinds of rare earth elements including Y) by performing a treatment, which includes at least a burning process to be performed in a range of temperatures that are higher than the melting point of a raw material mixture containing a RE-compound raw material, a Ba-compound raw material and a Cu-compound raw material, on the aforesaid raw material mixture. This method further comprises the addition step of adding 1 to 30 in percent by weight (wt %) of Ag to the raw material mixture, and the crystallization step of melting the raw material mixture, to which Ag is added, at a temperature that is not lower than a temperature at which the raw material mixture is decomposed and fused into the RE.sub.2 BaCuO.sub.Type: GrantFiled: July 30, 1997Date of Patent: September 28, 1999Assignees: Dowa Mining Co., Ltd., Chubu Electric Power Company, IncorporatedInventors: Shuichi Kohayashi, Shuetsu Haseyama, Shuji Yoshizawa, Shigeo Nagaya
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Patent number: 5849668Abstract: An oxide superconductor which exhibits an uniform and high critical current density. Further, a method of manufacturing this oxide superconductor, namely, a RE--Ba--Cu--O oxide superconductor (RE is one or more kinds of rare earth elements including Y) by performing a treatment, which includes at least a burning process to be performed in a range of temperatures that are higher than a melting point of a raw material mixture containing a RE-compound raw material, Ba-compound raw material and a Cu-compound raw material, on the raw material mixture. This method further comprises a step of crushing the raw material mixture into particles and establishing the mean particle diameter of one or all of the raw materials as ranging from 50 to 80 .mu.m.Type: GrantFiled: June 18, 1997Date of Patent: December 15, 1998Assignee: Dowa Mining Co., Ltd.Inventors: Kazuya Yamaguchi, Shuichi Kohayashi, Shuetsu Haseyama, Shuji Yoshizawa