Patents by Inventor Kazuhisa Kurashige
Kazuhisa Kurashige 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: 8728232Abstract: A single crystal heat treatment method having a step of heating a single crystal of a specific cerium-doped silicate compound in an oxygen-poor atmosphere at a temperature T1 (units: ° C.) that satisfies the conditions represented by formula (3) below 800?T1<(Tm1?550)??(3) (wherein Tm1 (units: ° C.) represents the melting point of the single crystal).Type: GrantFiled: March 14, 2006Date of Patent: May 20, 2014Assignee: Hitachi Chemical Co., Ltd.Inventors: Tatsuya Usui, Naoaki Shimura, Yasushi Kurata, Kazuhisa Kurashige
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Patent number: 7749323Abstract: A single crystal for a scintillator that is a specific single crystal of a cerium-activated orthosilicate compound that comprises 0.00005 to 0.1 wt. %, based on the entire weight of the single crystal, of at least one element selected from a group consisting of elements belonging to Group 13 of the periodic table.Type: GrantFiled: May 30, 2007Date of Patent: July 6, 2010Assignee: Hitachi Chemical Company, Ltd.Inventors: Naoaki Shimura, Yasushi Kurata, Tatsuya Usui, Kazuhisa Kurashige
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Patent number: 7618491Abstract: A scintillator single crystal of a specific cerium-doped silicate compound that contains 0.00005 to 0.1 wt % of one or more types of element selected from the group consisting of elements belonging to group 2 of the periodic table based on the total weight of the single crystal.Type: GrantFiled: March 14, 2006Date of Patent: November 17, 2009Assignee: Hitachi Chemical Company, Ltd.Inventors: Yasushi Kurata, Naoaki Shimura, Tatsuya Usui, Kazuhisa Kurashige
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Patent number: 7531036Abstract: The present invention provides a single crystal heat treatment method, having a step of heating a single crystal of a cerium-doped silicate compound represented by any of general formulas (1) to (4) below in an oxygen-containing atmosphere Y2?(x+y)LnxCeySiO5??(1) (wherein Ln represents at least one elemental species selected from a group consisting of elements belonging to the rare earth elements, x represents a numerical value from 0 to 2, and y represents a numerical value greater than 0 but less than or equal to 0.2) Gd2?(z+w)LnzCewSiO5??(2) (wherein Ln represents at least one elemental species selected from a group consisting of elements belonging to the rare earth elements, z represents a numerical value greater than 0 but less than or equal to 2, and w represents a numerical value greater than 0 but less than or equal to 0.Type: GrantFiled: March 14, 2006Date of Patent: May 12, 2009Assignee: Hitachi Chemical Company, Ltd.Inventors: Naoaki Shimura, Yasushi Kurata, Tatsuya Usui, Kazuhisa Kurashige
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Patent number: 7510671Abstract: The inorganic scintillator of the invention is an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising a metal oxide containing Lu, Gd, Ce and Si and belonging to space group C2/c monoclinic crystals, and which satisfies the condition specified by the following inequality (1A), wherein ALu represents the number of Lu atoms in the crystal and AGd represents the number of Gd atoms in the crystal. {ALu/(ALu+AGd)}<0.Type: GrantFiled: June 17, 2005Date of Patent: March 31, 2009Assignee: Hitachi Chemical Company, Ltd.Inventors: Kazuhisa Kurashige, Naoaki Shimura, Hiroyuki Ishibashi, Keiji Sumiya, Tatsuya Usui, Shigenori Shimizu
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Publication number: 20080089824Abstract: A single crystal for a scintillator that is a specific single crystal of a cerium-activated orthosilicate compound that comprises 0.00005 to 0.1 wt. %, based on the entire weight of the single crystal, of at least one element selected from a group consisting of elements belonging to Group 13 of the periodic table.Type: ApplicationFiled: May 30, 2007Publication date: April 17, 2008Applicant: HITACHI CHEMICAL COMPANY, LTD.Inventors: Naoaki Shimura, Yasushi Kurata, Tatsuya Usui, Kazuhisa Kurashige
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Publication number: 20070292330Abstract: The scintillator single crystal of the invention is a specific cerium-activated silicate single crystal wherein the total content of one or more elements selected from the group consisting of elements belonging to Groups 4, 5, 6 and Groups 14, 15, 16 of the Periodic Table is no greater than 0.002 wt % based on the total weight of the single crystal.Type: ApplicationFiled: March 22, 2007Publication date: December 20, 2007Inventors: Yasushi Kurata, Naoaki Shimura, Tatsuya Usui, Kazuhisa Kurashige
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Publication number: 20070289525Abstract: The inorganic scintillator of the invention is an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising a metal oxide containing Lu, Gd, Ce and Si and belonging to space group C2/c monoclinic crystals, and which satisfies the condition specified by the following inequality (1A), wherein ALu represents the number of Lu atoms in the crystal and AGd represents the number of Gd atoms in the crystal. {ALu/(ALu+AGd)}<0.Type: ApplicationFiled: August 21, 2007Publication date: December 20, 2007Inventors: Kazuhisa Kurashige, Naoaki Shimura, Hiroyuki Ishibashi, Keiji Sumiya, Tatsuya Usui, Shigenori Shimizu
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Publication number: 20070277726Abstract: The present invention provides a method for heat treating a single crystal, comprising a step of heating a single crystal of a specific cerium-activated orthosilicate compound in an oxygen-containing atmosphere.Type: ApplicationFiled: May 31, 2007Publication date: December 6, 2007Inventors: Tatsuya Usui, Naoaki Shimura, Yasushi Kurata, Kazuhisa Kurashige
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Patent number: 7301154Abstract: The inorganic scintillator of the invention is an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising a metal oxide containing Lu, Gd, Ce and Si and belonging to space group C2/c monoclinic crystals, and which simultaneously satisfies the conditions specified by the following inequalities (1) and (2). {ALu/(ALu+AGd)}<0.50??(1) {ACe/(ALu+AGd)}?0.002??(2) wherein ALu represents the number of Lu atoms in the crystal, AGd represents the number of Gd atoms in the crystal, and ACe represents the number of Ce atoms in the crystal.Type: GrantFiled: June 17, 2005Date of Patent: November 27, 2007Assignee: Hitachi Chemical Co., Ltd.Inventors: Kazuhisa Kurashige, Naoaki Shimura, Hiroyuki Ishibashi, Keiji Sumiya, Tatsuya Usui, Shigenori Shimizu
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Patent number: 7297954Abstract: The inorganic scintillator of the invention has the chemical composition represented by CexLnySizOu (where Ln represents at least two elements selected from among Y, Gd and Lu. 0.001?x?0.1, 1.9?y?2.1, 0.9?z?1.1, 4.9?u?5.1) and emits fluorescence upon incidence of radiation, wherein the maximum peak wavelength in the intensity spectrum of the emitted fluorescence is a peak in the range between 450 nm and 600 nm.Type: GrantFiled: May 22, 2006Date of Patent: November 20, 2007Assignee: Hitachi Chemical Company, Ltd.Inventors: Kazuhisa Kurashige, Hiroyuki Ishibashi, Tatsuya Usui, Shigenori Shimizu, Naoaki Shimura
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Patent number: 7282161Abstract: The present invention provides an inorganic scintillator including a matrix material comprising a metal oxide, and a luminescence center made of Ce contained in the matrix material, the inorganic scintillator being adapted to scintillate in response to a radiation; wherein the matrix material further comprises a dopant having a tetravalent ionization energy I [kJ·mol?1] satisfying the condition represented by the following expression (1): 3000?I?3500.Type: GrantFiled: January 19, 2005Date of Patent: October 16, 2007Assignee: Hitachi Chemical Co., Ltd.Inventors: Kazuhisa Kurashige, Hiroyuki Ishibashi, Keiji Sumiya, Nachimuthu Senguttuvan, Kazuhiro Yoshida, Naoaki Shimura
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Patent number: 7282718Abstract: This invention provides an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising metal oxides including Lu, Gd, Ce and Si, which satisfies the condition specified by the following inequality (1A): 0.0025?{ACe/(ALu+AGd)}?0.025,??(1A) and which has an absorption coefficient of no greater than 0.500 cm?1 for light with a wavelength of 415 nm.Type: GrantFiled: September 8, 2005Date of Patent: October 16, 2007Assignee: Hitachi Chemical Co., Ltd.Inventors: Shigenori Shimizu, Kazuhisa Kurashige, Tatsuya Usui, Naoaki Shimura, Hiroyuki Ishibashi, Keiji Sumiya, Kenzou Susa
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Rare earth silicate single crystal and process for production of rare earth silicate single crystals
Patent number: 7264750Abstract: When produced as a single crystal ingot, a rare earth silicate single crystal 1 can be formed by cutting out from the single crystal ingot. The single crystal 1 has a crystal face F100 whose Miller indices can be determined by X-ray diffraction. The crystal face F100 is composed of a plurality of smooth partial region surfaces (for example, the partial region surface f100A and partial region surface f100B), the plurality of partial region surfaces each have an area detectable by X-ray diffraction, and the angles ? formed between the normal vectors of the plurality of partial region surfaces satisfy the following inequality: 0.1°???2.0°.Type: GrantFiled: July 26, 2004Date of Patent: September 4, 2007Assignee: Hitachi Chemical Co., Ltd.Inventors: Kazuhisa Kurashige, Naoaki Shimura, Hiroyuki Ishibashi, Akihiro Gunji, Mitsushi Kamada -
Publication number: 20060288926Abstract: A scintillator single crystal of a specific cerium-doped silicate compound that contains 0.00005 to 0.1 wt % of one or more types of element selected from the group consisting of elements belonging to group 2 of the periodic table based on the total weight of the single crystal.Type: ApplicationFiled: March 14, 2006Publication date: December 28, 2006Applicant: HITACHI CHEMICAL COMPANY, LTD.Inventors: Yasushi Kurata, Naoaki Shimura, Tatsuya Usui, Kazuhisa Kurashige
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Publication number: 20060266277Abstract: A single crystal heat treatment method having a step of heating a single crystal of a specific cerium-doped silicate compound in an oxygen-poor atmosphere at a temperature T1 (units: ° C.) that satisfies the conditions represented by formula (3) below 800?T1<(Tm1?550)??(3) (wherein Tm1 (units: ° C.) represents the melting point of the single crystal).Type: ApplicationFiled: March 14, 2006Publication date: November 30, 2006Applicant: HITACHI CHEMICAL COMPANY, LTD.Inventors: Tatsuya Usui, Naoaki Shimura, Yasushi Kurata, Kazuhisa Kurashige
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Publication number: 20060266276Abstract: The present invention provides a single crystal heat treatment method, having a step of heating a single crystal of a cerium-doped silicate compound represented by any of general formulas (1) to (4) below in an oxygen-containing atmosphere Y2-(x+y)LnxCeySiO5??(1) (wherein Ln represents at least one elemental species selected from a group consisting of elements belonging to the rare earth elements, x represents a numerical value from 0 to 2, and y represents a numerical value greater than 0 but less than or equal to 0.2) Gd2-(z+w)LnzCewSiO5??(2) (wherein Ln represents at least one elemental species selected from a group consisting of elements belonging to the rare earth elements, z represents a numerical value greater than 0 but less than or equal to 2, and w represents a numerical value greater than 0 but less than or equal to 0.Type: ApplicationFiled: March 14, 2006Publication date: November 30, 2006Applicant: HITACHI CHEMICAL COMPANY, LTD.Inventors: Naoaki Shimura, Yasushi Kurata, Tatsuya Usui, Kazuhisa Kurashige
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Publication number: 20060266945Abstract: The inorganic scintillator of the invention has the chemical composition represented by CexLnySizOu (where Ln represents at least two elements selected from among Y, Gd and Lu. 0.001?x?0.1, 1.9?y?2.1, 0.9?z?1.1, 4.9?u?5.1) and emits fluorescence upon incidence of radiation, wherein the maximum peak wavelength in the intensity spectrum of the emitted fluorescence is a peak in the range between 450 nm and 600 nm.Type: ApplicationFiled: May 22, 2006Publication date: November 30, 2006Inventors: Kazuhisa Kurashige, Hiroyuki Ishibashi, Tatsuya Usui, Shigenori Shimizu, Naoaki Shimura
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Publication number: 20060054831Abstract: This invention provides an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising metal oxides including Lu, Gd, Ce and Si, which satisfies the condition specified by the following inequality (1A): 0.0025?{ACe/(ALu+AGd)}?0.025??(1A), and which has an absorption coefficient of no greater than 0.500 cm?1 for light with a wavelength of 415 nm.Type: ApplicationFiled: September 8, 2005Publication date: March 16, 2006Inventors: Shigenori Shimizu, Kazuhisa Kurashige, Tatsuya Usui, Naoaki Shimura, Hiroyuki Ishibashi, Keiji Sumiya, Kenzou Susa
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Publication number: 20060000408Abstract: The inorganic scintillator of the invention is an inorganic scintillator capable of producing scintillation by radiation, which is a crystal comprising a metal oxide containing Lu, Gd, Ce and Si and belonging to space group C2/c monoclinic crystals, and which satisfies the condition specified by the following inequality (1A), wherein ALu represents the number of Lu atoms in the crystal and AGd represents the number of Gd atoms in the crystal. {ALu/(ALu+AGd)}<0.Type: ApplicationFiled: June 17, 2005Publication date: January 5, 2006Inventors: Kazuhisa Kurashige, Naoaki Shimura, Hiroyuki Ishibashi, Keiji Sumiya, Tatsuya Usui, Shigenori Shimizu