Patents by Inventor Takayoshi Ezuhara
Takayoshi Ezuhara 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: 7892451Abstract: Disclosed is a phosphor containing a nitrogen element, a compound having a garnet structure and an activator. The activator is composed of at least one element selected from the group consisting of Ce, Pr, Nd, Eu, Tb, Dy, Ho, Er, Tm, Yb and Mn.Type: GrantFiled: April 21, 2005Date of Patent: February 22, 2011Assignees: Sumitomo Chemical Company, Limited, Independent Administrative Institution National Institute for Materials ScienceInventors: Naoto Hirosaki, Takayoshi Ezuhara, Susumu Miyazaki
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Publication number: 20090315448Abstract: The present invention provides a phosphor, a phosphor paste and a light emitting device. The phosphor comprises a compound represented by the formula (1): M13(1-x)Eu3xM2mM3nO3+m+2n (1) wherein M1 is at least one selected from the group consisting of Ba, Sr and Ca, M2 is at least one selected from the group consisting of Mg and Zn, M3 is at least one selected from the group consisting of Si and Ge, and m, n and x satisfy the following relations: 0.9?m?1.1; 1.8 ?n?2.2; and 0.00016 ?x?0.003. The phosphor paste comprises the phosphor, an optional organic binder and an optional solvent. The light emitting device comprises the phosphor, and an optional excitation source for the phosphor.Type: ApplicationFiled: April 4, 2006Publication date: December 24, 2009Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Satoru Kuze, Takayoshi Ezuhara, Yuichiro Imanari, Susumu Miyazaki
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Publication number: 20070210284Abstract: Disclosed is a phosphor containing a nitrogen atom, a compound having a garnet structure and an activating agent. The activating agent is composed of at least one element selected from the group consisting of Ce, Pr, Nd, Eu, Tb, Dy, Ho, Er, Tm, Yb and Mn.Type: ApplicationFiled: April 21, 2005Publication date: September 13, 2007Inventors: Naoto Hirosaki, Takayoshi Ezuhara, Susumu Miyazaki
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Patent number: 7229571Abstract: An object of the present invention is to provide fluorescence showing a peak wavelength of excited spectrum within the wavelength range of from 350 to 500 nm and suitable for a white LED emitting yellow light, and a white LED comprising this fluorescence. This object achieved by phosphor for white. LED comprising a silicate fluorescent material and a borate fluorescent material.Type: GrantFiled: April 14, 2003Date of Patent: June 12, 2007Assignee: Sumitomo Chemical Company, LimitedInventors: Takayoshi Ezuhara, Susumu Miyazaki, Kenji Toda
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Patent number: 6960310Abstract: A phosphor for vacuum ultraviolet ray-excited light-emitting elements which comprises a compound represented by the following formula (I): M11?a?b?c?dM2aM3bM41?eM511?fM6c?d+e+fO19?(b+c+f)/2??(I) (wherein M1 is at least one element selected from the group consisting of La, Y and Gd, M2 is at least one element selected from the group consisting of Ce and Tb, M3 is at least one element selected from the group consisting of Ca, Sr and Ba, M4 is at least one element selected from the group consisting of Mg and Zn, M5 is at least one element selected from the group consisting of Al and Ga, and M6 is at least one element selected from the group consisting of Mn and Eu, and a, b, c, d, e and f are numbers satisfying the conditions of 0?a<1, 0?b?0.6, 0?c?0.5, 0?d?0.5, 0?e<1, 0?f<1, a+b+c+d<1 and 0<c+d+e+f), respectively.Type: GrantFiled: October 30, 2003Date of Patent: November 1, 2005Assignee: Sumitomo Chemical Company, LimitedInventors: Yuichiro Imanari, Takayoshi Ezuhara, Susumu Miyazaki
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Patent number: 6919060Abstract: The object of the present invention is to provide a process for producing particles of a metal compound having a spherical particle shape and an average particle diameter larger than 0.3 ?m without employing high-pressure conditions. This object is achieved by a process for producing particle of a metal compound comprising a step of adjusting pH of an aqueous solution containing urea and at least one metal element to from 4 to 8, a step of heating the aqueous solution under normal pressure, a step of separating a solid from the solution, and a step of drying the solid.Type: GrantFiled: February 21, 2003Date of Patent: July 19, 2005Assignees: Sumitomo Chemical Company, Limited, National Institute of Advance Industrial Science and TechnologyInventors: Keiji Ono, Susumu Miyazaki, Takayoshi Ezuhara, Yoshihiro Nishisu, Mikio Kobayashi
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Patent number: 6805814Abstract: The objective of the present invention is to provide a phosphor for use in a light emitting element excited by vacuum ultraviolet-ray that has high brightness even after plasma exposure. This object is achieved by a phosphor comprising a compound represented by a formula M11−aM211−bMna+bO18−(a+b)/2 (wherein, M1 represents at least one of materials selected from the group consisting of La, Y and Gd, and M2 represents at least one of materials selected from the group consisting of A1 and Ga, a represents a number in a range from not less than 0 to less than 1, b represents a number in a range from not less than 0 to less than 1, and sum of a and b is greater than 0), and by a light emitting element excited by vacuum ultraviolet-ray comprising the above-mentioned phosphor.Type: GrantFiled: May 28, 2003Date of Patent: October 19, 2004Assignee: Sumitomo Chemical Company, LimitedInventors: Takayoshi Ezuhara, Susumu Miyazaki, Toshinori Isobe
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Publication number: 20040084656Abstract: A phosphor for vacuum ultraviolet ray-excited light-emitting elements which comprises a compound represented by the following formula (I):Type: ApplicationFiled: October 30, 2003Publication date: May 6, 2004Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yuichiro Imanari, Takayoshi Ezuhara, Susumu Miyazaki
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Publication number: 20040036392Abstract: The objective of the present invention is to provide a phosphor for use in a light emitting element excited by vacuum ultraviolet-ray that has high brightness even after plasma exposure. This object is achieved by a phosphor comprising a compound represented by a formula M11−aM211−bMna+bO18−(a+b)/2 (wherein, M1 represents at least one of materials selected from the group consisting of La, Y and Gd, and M2 represents at least one of materials selected from the group consisting of Al and Ga, a represents a number in a range from not less than 0 to less than 1, b represents a number in a range from not less than 0 to less than 1, and sum of a and b is greater than 0), and by a light emitting element excited by vacuum ultraviolet-ray comprising the above-mentioned phosphor.Type: ApplicationFiled: May 28, 2003Publication date: February 26, 2004Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Takayoshi Ezuhara, Susumu Miyazaki, Toshinori Isobe
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Publication number: 20030227007Abstract: An object of the present invention is to provide fluorescence showing a peak wavelength of excited spectrum within the wavelength range of from 350 to 500 nm and suitable for a white LED emitting yellow light, and a white LED comprising this fluorescence. This object achieved by phosphor for white. LED comprising a silicate fluorescent material and a borate fluorescent material.Type: ApplicationFiled: April 14, 2003Publication date: December 11, 2003Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Takayoshi Ezuhara, Susumu Miyazaki, Kenji Toda
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Publication number: 20030160214Abstract: The object of the present invention is to provide a process for producing particles of a metal compound having a spherical particle shape and an average particle diameter larger than 0.3 &mgr;m without employing high-pressure conditions. This object is achieved by a process for producing particle of a metal compound comprising a step of adjusting pH of an aqueous solution containing urea and at least one metal element to from 4 to 8, a step of heating the aqueous solution under normal pressure, a step of separating a solid from the solution, and a step of drying the solid.Type: ApplicationFiled: February 21, 2003Publication date: August 28, 2003Applicant: SUMITOMO CHEMICAL CO. LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGYInventors: Keiji Ono, Susumu Miyazaki, Takayoshi Ezuhara, Yoshihiro Nishisu, Mikio Kobayashi