Patents by Inventor Koutoku Ohmi
Koutoku Ohmi 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: 20200231872Abstract: The present invention relates to a phosphor and a composition.Type: ApplicationFiled: July 24, 2018Publication date: July 23, 2020Applicant: MERCK PATENT GMBHInventors: Hiroshi OKURA, Stephan DERTINGER, Tarunjot SINGH, Ryuta SUZUKI, Kazuhisa AZUMA, Eiji NISHIHARA, Tadashi ISHIGAKI, Koutoku OHMI, Ryota YAMANASHI, Kenji TODA, Daniel SZABO, Noriyuki MATSUDA
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Publication number: 20200205415Abstract: The present invention relates to a composition comprising at least one phosphor.Type: ApplicationFiled: July 25, 2018Publication date: July 2, 2020Applicant: Merck Patent GmbHInventors: Hiroshi OKURA, Stephan DERTINGER, Ryuta SUZUKI, Kazuhisa AZUMA, Ryota YAMANASHI, Eiji NISHIHARA, Tadashi ISHIGAKI, Koutoku OHMI, Kenji TODA
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Publication number: 20190031954Abstract: The present invention relates to a composition comprising a fluorescent material and a matrix material, a color conversion sheet and a light emitting diode device. The present invention further relates to the use of the composition in a color conversion sheet fabrication process, to the use of the color conversion sheet in optical devices or for agriculture purposes, and to the use of the fluorescent material and the matrix material in light emitting diode devices. Additionally, the invention relates to an optical device comprising the color conversion sheet and to a method for preparing the color conversion sheet and the optical device.Type: ApplicationFiled: January 18, 2017Publication date: January 31, 2019Applicant: Merck Patent GmbHInventors: Hiroshi OKURA, Stephan DERTINGER, Eiji NISHIHARA, Tadashi ISHIGAKI, Koutoku OHMI
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Patent number: 8975619Abstract: The invention relates to co-activated silicate based phosphors. The invention further relates to the method of preparing these phosphors and to the use of these phosphors in electronic and electrooptical devices, in particular in light emitting diodes (LEDs) and solar cells. The invention further relates to illumination units comprising said phosphors.Type: GrantFiled: July 28, 2011Date of Patent: March 10, 2015Assignee: Merck Patent GmbHInventors: Hiroshi Okura, Takeo Wakimoto, Koutoku Ohmi, Yoshinobu Miyamoto
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Publication number: 20130153882Abstract: The invention relates to co-activated silicate based phosphors. The invention further relates to the method of preparing these phosphors and to the use of these phosphors in electronic and electrooptical devices, in particular in light emitting diodes (LEDs) and solar cells. The invention further relates to illumination units comprising said phosphors.Type: ApplicationFiled: July 28, 2011Publication date: June 20, 2013Applicant: MERCK PATENT GESELLSCHAFT MIT BESCHRANKTER HAFTUNGInventors: Hiroshi Okura, Takeo Wakimoto, Koutoku Ohmi, Yoshinobu Miyamoto
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Patent number: 8017037Abstract: A fluorescent substance capable of remarkably increasing the luminous intensity of a I-III-VI2 chalcopyrite type compound having a large band gap among chalcopyrite type compounds with manganese as luminescence centers, and being favorably used for a lighting device using a light emitting diode, a light emitting element of a display device or the like, a light emitting device such as fluorescent lamps such as a cold cathode fluorescent lamp and a hot cathode fluorescent lamp, as a fluorescent substance generating fluorescence by ultraviolet excitation, is provided. The fluorescent substance is expressed by composition formula (1) Cu(Al1-xGax)(S1-ySey)2:Mn,Si??(1) (wherein x represents a number satisfying 0?x?0.4, and y represents a number satisfying 0?y?0.4), including manganese as a luminescence center atom.Type: GrantFiled: March 25, 2008Date of Patent: September 13, 2011Assignees: NEC Lighting, Ltd, Tottori UniversityInventors: Maki Minamoto, Koutoku Ohmi, Kazuaki Tsuji
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Publication number: 20100224829Abstract: Disclosed is a phosphor having high luminance, which is composed of M1, M2, M3, M4, a halogen element and O, wherein M1 represents an alkaline earth metal; M2 represents a trivalent metal element; M3 represents an activating element; and M4 represents a tetravalent metal element, with the molar ratio among M1, (M2+M3), M4, and the halogen element, namely M1:(M2+M3):M4: halogen element being 1:4:3:a wherein a is a number within the range of not less than 0.01 but not more than 3. The phosphor can be obtained by firing a metal compound mixture containing M1, M2, M3, M4, and a halogen element, wherein M1, M2, M3 and M4 are as defined above, which additionally contains one or more halides selected from the group consisting of halides of M1, halides of M2 and halides of M3.Type: ApplicationFiled: August 25, 2008Publication date: September 9, 2010Applicants: SUMITOMO CHEMICAL COMPANY, LIMITED, NATIONAL UNIVERSITY CORPORATION TOTTORI UNIVERSITYInventors: Yutaka Ito, Koutoku Ohmi, Akira Yamane, Atsushi Kobayashi, Takashi Kunimoto
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Patent number: 7517473Abstract: A method for producing a blue phosphor, comprising firing a mixture for 2 to 24 hours at a temperature of 800° C. or higher in an atmosphere of hydrogen sulfide, carbon disulfide, or an inert gas, the mixture containing a barium compound component, a silicon compound component, and a cerium compound component in quantitative proportions such that the atomic ratios of the components fulfill the equations 0.50<Si/Ba?0.70 and 0.0005 ?Ce/Ba?0.03, or the mixture further containing a sulfur compound component in addition to these components. The blue phosphor has high color purity, high luminance, high chemical stability, and a low crystallization temperature, and is suitable for use in displays such as FED, PDP, and EL displays, or for use in the excitation of near-ultraviolet LED.Type: GrantFiled: March 23, 2006Date of Patent: April 14, 2009Assignees: Tottori University, Mitsui Mining & Smelting Co., Ltd.Inventors: Koutoku Ohmi, Makoto Higuchi, Jun-ichi Itoh, Tomoyasu Yano, Asuka Sasakura
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Publication number: 20090051262Abstract: A fluorescent substance capable of remarkably increasing the luminous intensity of a I-III-VI2 chalcopyrite type compound having a large band gap among chalcopyrite type compounds with manganese as luminescence centers, and being favorably used for a lighting device using a light emitting diode, a light emitting element of a display device or the like, a light emitting device such as fluorescent lamps such as a cold cathode fluorescent lamp and a hot cathode fluorescent lamp, as a fluorescent substance generating fluorescence by ultraviolet excitation, is provided. The fluorescent substance is expressed by composition formula (1) Cu(Al1-xGax)(S1-ySey)2:Mn,Si??(1) (wherein x represents a number satisfying 0?x?0.4, and y represents a number satisfying 0?y?0.4), including manganese as a luminescence center atom.Type: ApplicationFiled: March 25, 2008Publication date: February 26, 2009Applicants: NEC LIGHTING, LTD., TOTTORI UNIVERSITYInventors: Maki MINAMOTO, Koutoku OHMI, Kazuaki TSUJI
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Publication number: 20060214135Abstract: A method for producing a blue phosphor, comprising firing a mixture for 2 to 24 hours at a temperature of 800° C. or higher in an atmosphere of hydrogen sulfide, carbon disulfide, or an inert gas, the mixture containing a barium compound component, a silicon compound component, and a cerium compound component in quantitative proportions such that the atomic ratios of the components fulfill the equations 0.50<Si/Ba?0.70 and 0.0005?Ce/Ba?0.03, or the mixture further containing a sulfur compound component in addition to these components. The blue phosphor has high color purity, high luminance, high chemical stability, and a low crystallization temperature, and is suitable for use in displays such as FED, PDP, and EL displays, or for use in the excitation of near-ultraviolet LED.Type: ApplicationFiled: March 23, 2006Publication date: September 28, 2006Inventors: Koutoku Ohmi, Makoto Higuchi, Jun-ichi Itoh, Tomoyasu Yano, Asuka Sasakura
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Patent number: 5300316Abstract: In order to provide a thin oxysulfide film excellent in crystallinity and suitable for use as a luminescent layer of a thin film EL device and a thin fluorescent film for a CRT, a metal element is evaporated from an evaporation source provided in a chamber in which a sulfur gas and an oxygen gas have been introduced to combine those substances chemically on a substrate provided in the chamber to form a thin oxysulfide film on a surface of the substrate.Type: GrantFiled: December 10, 1992Date of Patent: April 5, 1994Assignee: Kabushiki Kaisha Komatsu SeisakushoInventors: Koutoku Ohmi, Takashi Nire