Patents by Inventor Masahiro Rikukawa
Masahiro Rikukawa 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: 20190036167Abstract: The invention is an electrolyte composition comprising the following component (A), component (B) and component (C): component (A): an ionic compound having a melting point of 200° C. or lower (except for the following components (B) and (C)), component (B): an ionic compound including a Group 1 or 2 metal ion in the periodic table, and component (C): a zwitterionic compound, and a secondary battery having a positive electrode, a negative electrode, and the electrolyte composition, and a method for using the secondary battery, wherein an upper limit of a cutoff voltage during charging is 4.4 to 5.5 V. One aspect of the invention provides an electrolyte composition excellent in flame retardance and non-volatility, a secondary battery excellent in cycling characteristics and having a high capacity, and a method for using the secondary battery.Type: ApplicationFiled: August 30, 2016Publication date: January 31, 2019Applicants: LINTEC Corporation, SOPHIA School CorporationInventors: Seitaro YAMAGUCHI, Sou MIYATA, Masahiro FUJITA, Masahiro RIKUKAWA
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Patent number: 8969430Abstract: A hydroxyapatite ceramic hybrid material includes a hydroxyapatite ceramic structure having pores therein and a biodegradable polymer included in the pores in the hydroxyapatite ceramic structure. The biodegradable polymer can be a poly L-lactic acid polymer. A method for preparing a hydroxyapatite ceramic-biodegradable polymer hybrid material includes preparing a porous hydroxyapatite ceramic containing pores having an average pore diameter of 10 ?m or larger; and forming a biodegradable polymer in the pores of the porous hydroxyapatite ceramic. The porous hydroxyapatite ceramic may be prepared by: preparing a slurry comprising hydroxyapatite fibers and heat-degradable particles in a selected solvent; filtering the slurry to obtain a paste; preparing a molded body using the paste; compacting the molded body to produce a green compact; and firing the green compact at a temperature at least 1000° C. to produce a porous hydroxyapatite ceramic structure.Type: GrantFiled: November 18, 2009Date of Patent: March 3, 2015Assignee: Showa-Ika Kogyo Co. Ltd.Inventors: Mamoru Aizawa, Masahiro Rikukawa
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Patent number: 8871167Abstract: A hydroxyapatite ceramic hybrid material, which includes a biodegradable polymer included in the pores in a hydroxyapatite ceramic structure, and a method thereof, and a calcium phosphate porous body, which is formed by an intertwining of fibrous calcium phosphates and includes a plurality of first pores formed where the fibrous calcium phosphates interconnect and plurality of equal diameter substantially spherical second pores with a larger inside diameter than the first pores, and a method thereof are provided.Type: GrantFiled: November 30, 2011Date of Patent: October 28, 2014Assignees: Meiji University, Showa Ika Kogyo Co. Ltd.Inventors: Mamoru Aizawa, Masahiro Rikukawa, Yusuke Shigemitsu, Hiroshi Nagashima
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Publication number: 20120136088Abstract: A hydroxyapatite ceramic hybrid material, which includes a biodegradable polymer included in the pores in a hydroxyapatite ceramic structure, and a method thereof, and a calcium phosphate porous body, which is formed by an intertwining of fibrous calcium phosphates and includes a plurality of first pores formed where the fibrous calcium phosphates interconnect and plurality of equal diameter substantially spherical second pores with a larger inside diameter than the first pores, and a method thereof are provided.Type: ApplicationFiled: November 30, 2011Publication date: May 31, 2012Applicants: SHOWA-IKA KOGYO CO. LTD., MEIJI UNIVERSITYInventors: Mamoru Aizawa, Masahiro Rikukawa, Yusuke Shigemitsu, Hiroshi Nagashima
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Patent number: 7740968Abstract: This invention relates to an ion-conducting binder used for a membrane electrode assembly for polymer electrolyte fuel cells, the assembly consisting of a polymer electrolyte membrane and two gas diffusion electrodes stuck to the polymer electrolyte membrane with the membrane put between the electrodes, which binder comprises a block copolymer which comprises a polymer block (A) having as a main unit an aromatic vinyl compound unit whose ?-carbon is quaternary carbon, and a flexible polymer block (B), and has ion-conducting groups on the polymer block (A), and a solution or suspension thereof, and a membrane electrode assembly and a polymer electrolyte fuel cell. The ion-conducting binder, membrane electrode assembly and polymer electrolyte fuel cell of this invention are economical, mild to the environment and excellent in moldability and oxidation stability.Type: GrantFiled: December 20, 2005Date of Patent: June 22, 2010Assignee: Kuraray Co., Ltd.Inventors: Takashi Yamashita, Shinji Nakai, Hiroyuki Ogi, Tomohiro Ono, Masahiro Rikukawa
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Publication number: 20100152317Abstract: A hydroxyapatite ceramic hybrid material includes a hydroxyapatite ceramic structure having pores therein and a biodegradable polymer included in the pores in the hydroxyapatite ceramic structure. The biodegradable polymer can be a poly L-lactic acid polymer. A method for preparing a hydroxyapatite ceramic-biodegradable polymer hybrid material includes preparing a porous hydroxyapatite ceramic containing pores having an average pore diameter of 10 ?m or larger; and forming a biodegradable polymer in the pores of the porous hydroxyapatite ceramic. The porous hydroxyapatite ceramic may be prepared by: preparing a slurry comprising hydroxyapatite fibers and heat-degradable particles in a selected solvent; filtering the slurry to obtain a paste; preparing a molded body using the paste; compacting the molded body to produce a green compact; and firing the green compact at a temperature at least 1000° C. to produce a porous hydroxyapatite ceramic structure.Type: ApplicationFiled: November 18, 2009Publication date: June 17, 2010Applicant: SHOWA-IKA KOGYO CO. LTDInventors: Mamoru Aizawa, Masahiro Rikukawa
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Patent number: 7384996Abstract: The invention provides phosphonated poly(4-phenoxybenzoyl-1,4-phenylene), and synthesizing method thereof, an antioxidant formed of phosphonated poly(4-phenoxybenzoyl-1,4-phenylene), a high-durability polymer electrolyte composite formed of a fluoropolymer electrolyte and phosphonated poly(4-phenoxybenzoyl-1,4-phenylene), and a fuel cell in which the high-durability polymer electrolyte composite is used in an electrode thereof.Type: GrantFiled: November 25, 2003Date of Patent: June 10, 2008Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takumi Taniguchi, Masayoshi Takami, Masahiro Rikukawa, Yuko Takeoka
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Publication number: 20080113244Abstract: This invention relates to an ion-conducting binder used for a membrane electrode assembly for polymer electrolyte fuel cells, the assembly consisting of a polymer electrolyte membrane and two gas diffusion electrodes stuck to the polymer electrolyte membrane with the membrane put between the electrodes, which binder comprises a block copolymer which comprises a polymer block (A) having as a main unit an aromatic vinyl compound unit whose ?-carbon is quaternary carbon, and a flexible polymer block (B), and has ion-conducting groups on the polymer block (A), and a solution or suspension thereof, and a membrane electrode assembly and a polymer electrolyte fuel cell. The ion-conducting binder, membrane electrode assembly and polymer electrolyte fuel cell of this invention are economical, mild to the environment and excellent in moldability and oxidation stability.Type: ApplicationFiled: December 20, 2005Publication date: May 15, 2008Applicant: KURARAY CO., LTDInventors: Takashi Yamashita, Shinji Nakai, Hiroyuki Ogi, Tomohiro Ono, Masahiro Rikukawa
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Patent number: 7160968Abstract: The invention relates to solid polyelectrolyte membranes and processes for their production. As solid polyelectrolyte materials, there have been known fluoropolymers which have perfluoroskeletons and side chains bearing sulfonic acid groups and heat-resistant resins which have hydrocarbon skeletons and contain alkylsulfonic acid or alkylphosphoric acid groups introduced thereto. The fluoropolymers are excellent in heat resistance and chemical resistance but have the problem of being expensive, while the heat-resistant resins have the problem of being poor in chemical resistance. Further, solid polyelectrolyte materials having higher electric conductivities have been desired.Type: GrantFiled: October 19, 2001Date of Patent: January 9, 2007Assignee: Canon Kabushiki KaishaInventors: Iko Ito, Masahiro Rikukawa
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Publication number: 20060293475Abstract: The invention relates to solid polyelectrolyte membranes and processes for their production. As solid polyelectrolyte materials, there have been known fluoropolymers which have perfluoroskeletons and side chains bearing sulfonic acid groups and heat-resistant resins which have hydrocarbon skeletons and contain alkylsulfonic acid or alkylphosphoric acid groups introduced thereto. The fluoropolymers are excellent in heat resistance and chemical resistance but have the problem of being expensive, while the heat-resistant resins have the problem of being poor in chemical resistance. Further, solid polyelectrolyte materials having higher electric conductivities have been desired.Type: ApplicationFiled: August 29, 2006Publication date: December 28, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Iko Ito, Masahiro Rikukawa
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Publication number: 20040138352Abstract: The invention provides phosphonated poly(4-phenoxybenzoyl-1,4-phenylene), and synthesizing method thereof, an antioxidant formed of phosphonated poly(4-phenoxybenzoyl-1,4-phenylene), a high-durability polymer electrolyte composite formed of a fluoropolymer electrolyte and phosphonated poly(4-phenoxybenzoyl-1,4-phenylene), and a fuel cell in which the high-durability polymer electrolyte composite is used in an electrode thereof.Type: ApplicationFiled: November 25, 2003Publication date: July 15, 2004Inventors: Takumi Taniguchi, Masayoshi Takami, Masahiro Rikukawa, Yuko Takeoka
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Publication number: 20040044160Abstract: The invention relates to solid polyelectrolyte membranes and processes for their production. As solid polyelectrolyte materials, there have been known fluoropolymers which have perfluoroskeletons and side chains bearing sulfonic acid groups and heat-resistant resins which have hydrocarbon skeletons and contain alkylsulfonic acid or alkylphosphoric acid groups introduced thereto. The fluoropolymers are excellent in heat resistance and chemical resistance but have the problem of being expensive, while the heat-resistant resins have the problem of being poor in chemical resistance. Further, solid polyelectrolyte materials having higher electric conductivities have been desired.Type: ApplicationFiled: April 18, 2003Publication date: March 4, 2004Inventors: Iko Ito, Masahiro Rikukawa
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Patent number: 5403675Abstract: Sulfonated polyphenylene solid polymer electrolytes having high proton conductivity are provided, which are stable and which maintain high conductivity at temperatures of 100.degree. C. and above. These membranes are useful as solid polymer electrolytes for fuel cells and can be operated above the boiling point of water.Type: GrantFiled: April 9, 1993Date of Patent: April 4, 1995Assignee: Maxdem, IncorporatedInventors: Naoya Ogata, Masahiro Rikukawa