Patents by Inventor Toshihiro Yamamoto
Toshihiro Yamamoto 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: 9343685Abstract: Provided is an organic electroluminescent device (EL device) that uses an indolocarbazole compound. The organic EL device includes an anode, a plurality of organic layers including a phosphorescent light-emitting layer, and a cathode laminated on a substrate, in which at least one organic layer selected from the phosphorescent light-emitting layer, a hole-transporting layer, an electron-transporting layer, and a hole-blocking layer contains an indolocarbazole compound represented by the general formula (1). In the general formula (1), a ring I and a ring II represent rings represented by the formula (1a) and the formula (1b), respectively, each of which are fused to an adjacent ring. X's each represent nitrogen or C—Y and at least one of X's represents nitrogen. Y's each represent hydrogen, an alkyl group, a cycloalkyl group, or an aromatic group. A represents an alkyl group, a cycloalkyl group, or an aromatic group. At least one of Y and A represents an alkyl group or a cycloalkyl group.Type: GrantFiled: November 21, 2011Date of Patent: May 17, 2016Assignee: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Takahiro Kai, Masaki Komori, Toshihiro Yamamoto, Tohru Asari, Takaya Ishiyama, Megumi Matsumoto
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Patent number: 9299947Abstract: Provided is an organic electroluminescent device (organic EL device), which has improved luminous efficiency, shows sufficiently ensured driving stability, and has a simple construction. The organic electroluminescent device includes an anode, a cathode, and organic layers including a hole-transporting layer and a light-emitting layer, the organic layers being interposed between the anode and the cathode, in which the light-emitting layer contains a phosphorescent light-emitting material and the hole-transporting layer and the light-emitting layer have an electron- and/or exciton-blocking layer therebetween, the electron- and/or exciton-blocking layer being adjacent to the light-emitting layer and containing an indolocarbazole compound represented by the general formula (2). In the formula, a ring B represents a heterocycle represented by the formula (1c) to be fused with adjacent rings, Z represents an n-valent aromatic hydrocarbon group or an aromatic heterocyclic group, and n represents 1 or 2.Type: GrantFiled: March 25, 2010Date of Patent: March 29, 2016Assignees: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD., PIONEER CORPORATIONInventors: Takahiro Kai, Toshihiro Yamamoto, Masaki Komori, Kazuaki Yoshimura, Taishi Tsuji, Yasuhiro Takahashi
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Patent number: 9290498Abstract: Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, fully secure of driving stability, and of a simple configuration. The organic EL device comprises organic layers comprising a hole-transporting layer and a light-emitting layer sandwiched between an anode and a cathode. The light-emitting layer contains a fluorescent light-emitting material and an electron- and/or exciton-blocking layer containing an indolocarbazole derivative represented by general formula (2) is disposed between the hole-transporting layer and the light-emitting layer so as to be adjacent to the light-emitting layer. In general formula (2), ring B is a heterocyclic ring fused to the adjacent rings and represented by formula (1c), Z is an n-valent aromatic hydrocarbon group or aromatic heterocyclic group, and n is 1 or 2.Type: GrantFiled: October 19, 2010Date of Patent: March 22, 2016Assignees: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD., PIONEER CORPORATION, TOHOKU PIONEER CORPORATIONInventors: Takahiro Kai, Toshihiro Yamamoto, Masaki Komori, Kazuaki Yoshimura, Taishi Tsuji, Yasuhiro Takahashi, Toshinao Yuki, Yusuke Nakajima
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Patent number: 9260433Abstract: Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, sufficiently secures driving stability, and has a simple configuration. The organic EL device of this invention comprises a light-emitting layer between an anode and a cathode piled one upon another on a substrate and the light-emitting layer contains a phosphorescent dopant and an unsymmetrical indolocarbazole compound as a host material. The unsymmetrical indolocarbazole compound has a structure in which two or more groups having an indolocarbazole structure are linked together by a linking group and at least one of the groups has an isomeric indolocarbazole skeleton different from those of the other groups. Examples of the unsymmetrical indolocarbazole compound include compounds represented by the following formula (2) wherein A is a substituent, each of R1 to R3 is a hydrogen atom or a substituent, and L is a linking group composed of an aromatic group.Type: GrantFiled: November 18, 2010Date of Patent: February 16, 2016Assignee: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Takahiro Kai, Toshihiro Yamamoto, Masaki Komori, Megumi Matsumoto
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Publication number: 20160020397Abstract: Provided are an organic EL device which is practically satisfactory in terms of a light-emitting characteristic, a driving voltage, and durability, and a compound for organic EL devices to be used in the device. The organic EL device is an organic EL device produced by laminating, on a substrate, an anode, a plurality of organic layers including a light-emitting layer, and a cathode, the organic EL device containing, in at least one organic layer selected from the light-emitting layer, a hole-transporting layer, an electron-transporting layer, a hole-blocking layer, and an electron-blocking layer, a boron compound having two indolocarbazolyl groups in a molecule thereof. The boron compound is represented by Y-L-B(A)a-L-Y or Y-L(Z)b-Y, where Y represents an indolocarbazolyl group, L represents an aromatic group, and Z represents a boron-containing group.Type: ApplicationFiled: February 24, 2014Publication date: January 21, 2016Applicant: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Rumi SANNOMIYA, Masaki KOMORI, Masashi TADA, Takahiro KAI, Toshihiro YAMAMOTO
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Publication number: 20150369797Abstract: The present invention has an object of providing a sugar derivative emitting blue fluorescence color which can be used for imaging of cells or intracellular molecules and a method for imaging cells using the derivative. Further, the present invention has an object of providing a method for detecting cancer cells at high accuracy by imaging, and an imaging agent used for this method. The present invention provides a fluorescently labeled sugar derivative having 3-carboxy-6,8-difluoro-7-hydroxycoumarin or 3-carboxymethyl-6,8-difluoro-7-hydroxy-4-methylcoumarin as a fluorescent molecular group in its molecule, and a cell imaging agent and an imaging method using the derivative. Further, the present invention provides an imaging agent and an imaging method for cancer cells using an L-glucose derivative having the above-described fluorescent molecular group in its molecule.Type: ApplicationFiled: October 1, 2013Publication date: December 24, 2015Applicant: HIROSAKI UNIVERSITYInventors: Katsuya YAMADA, Tadashi TESHIMA, Toshihiro YAMAMOTO
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Organic electroluminescent device comprising an organic layer containing an indolocarbazole compound
Patent number: 9156843Abstract: Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple configuration. This organic EL device is constituted of an anode, organic layers comprising a phosphorescent light-emitting layer, and a cathode piled one upon another on a substrate and at least one organic layer selected from a light-emitting layer, an electron-transporting layer, and a hole-blocking layer contains an indolocarbazole compound represented by general formula (1). In the case where the indolocarbazole compound is incorporated in the light-emitting layer containing a phosphorescent dopant and a host material, it is incorporated as the host material.Type: GrantFiled: January 27, 2011Date of Patent: October 13, 2015Assignee: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Takahiro Kai, Masaki Komori, Toshihiro Yamamoto, Megumi Matsumoto -
Patent number: 9133205Abstract: Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple configuration. This organic EL device has a light-emitting layer between an anode and a cathode piled one upon another on a substrate and the said light-emitting layer contains a fused polycyclic compound in which seven or more rings are fused together as a host material. The aforementioned fused polycyclic compound has a structure formed by fusing two or more indole rings to a carbazole ring. A specific example thereof is the compound represented by the following formula.Type: GrantFiled: February 7, 2011Date of Patent: September 15, 2015Assignee: NIPPON STEEL & SUMIKIN CHEMICAL CO., LTD.Inventors: Takahiro Kai, Masaki Komori, Toshihiro Yamamoto, Megumi Matsumoto
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Publication number: 20150218191Abstract: Provided are an organic EL device practically satisfactory in terms of its light-emitting characteristics, driving voltage, and durability, and a compound for an organic EL device to be used in the device. The organic EL device has a structure in which an anode, a plurality of organic layers including a light-emitting layer, and a cathode are laminated on a substrate, and the organic EL device contains an indolocarbazole compound in at least one organic layer selected from the light-emitting layer, a hole-transporting layer, an electron-transporting layer, a hole-blocking layer, and an electron-blocking layer. The indolocarbazole compound is a compound having, in a molecule thereof, at least one boron-containing group having such a structure that boron of the boron-containing group is bonded to an atom on a linking group bonded to a nitrogen atom of an indolocarbazole ring or to a carbon atom of the ring.Type: ApplicationFiled: September 25, 2013Publication date: August 6, 2015Inventors: Rumi Sannomiya, Takahiro Kai, Masaki Komori, Toshihiro Yamamoto, Masashi Tada
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Publication number: 20150212094Abstract: An object of the present invention is to provide a method for accurately evaluating the specific incorporation of D-glucose into cells. The present invention as a means for achieving the object is characterized by comprising contacting a D-glucose derivative that has a fluorescent chromophore in the molecule and is specifically incorporated into cells and an L-glucose derivative that has a fluorescent chromophore in the molecule with different cells in the same cell strain to be evaluated, respectively, comparing the fluorescence emitted by the D-glucose derivative that has a fluorescent chromophore in the molecule and is specifically incorporated into cells with the fluorescence emitted by the L-glucose derivative that has a fluorescent chromophore in the molecule, and evaluating the specific incorporation of D-glucose into cells relative to L-glucose by taking the difference between the two kinds of fluorescence intensities.Type: ApplicationFiled: February 5, 2015Publication date: July 30, 2015Inventors: Katsuya YAMADA, Tadashi TESHIMA, Toshihiro YAMAMOTO
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Patent number: 9040962Abstract: A combination of host materials suitable for co-evaporation or premix evaporation, and devices containing the combination of host materials are provided. The combination of host materials provides improved lifetime and efficiency. A method for fabricating devices containing the host material combination is also provided.Type: GrantFiled: April 28, 2010Date of Patent: May 26, 2015Assignees: Universal Display Corporation, Nippon Steel & Sumikin Chemical Co., Ltd.Inventors: Vadim Adamovich, Michael Weaver, Raymond Kwong, Chuanjun Xia, Bert Alleyne, Takahiro Kai, Masaki Komori, Toshihiro Yamamoto
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Patent number: 8986656Abstract: An object of the present invention is to provide a method for accurately evaluating the specific incorporation of D-glucose into cells. The present invention as a means for achieving the object is characterized by comprising contacting a D-glucose derivative that has a fluorescent chromophore in the molecule and is specifically incorporated into cells and an L-glucose derivative that has a fluorescent chromophore in the molecule with different cells in the same cell strain to be evaluated, respectively, comparing the fluorescence emitted by the D-glucose derivative that has a fluorescent chromophore in the molecule and is specifically incorporated into cells with the fluorescence emitted by the L-glucose derivative that has a fluorescent chromophore in the molecule, and evaluating the specific incorporation of D-glucose into cells relative to L-glucose by taking the difference between the two kinds of fluorescence intensities.Type: GrantFiled: August 7, 2009Date of Patent: March 24, 2015Assignees: Hirosaki University, National University Corporation Tokyo Unversity of Agriculture and TechnologyInventors: Katsuya Yamada, Hideaki Matsuoka, Tadashi Teshima, Toshihiro Yamamoto
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Patent number: 8962158Abstract: Provided is an organic electroluminescent device (organic EL device), which has improved luminous efficiency, has sufficient driving stability, and has a simple construction. The organic EL device of the present invention is an organic electroluminescent device, including a light-emitting layer and a hole-transporting layer between an anode and a cathode laminated on a substrate, in which the light-emitting layer contains a phosphorescent light-emitting dopant and an indolocarbazole compound that serves as a host material, or alternatively, the hole-transporting layer contains an indolocarbazole compound. The indolocarbazole compound is represented by the following formula (1). In the formula: A1's each represent an aromatic hydrocarbon group or an aromatic heterocyclic group, provided that at least one of A1's has a fused ring structure; and R1's each represent a hydrogen atom, an alkyl group, an alkoxy group, or an acyl group.Type: GrantFiled: March 25, 2010Date of Patent: February 24, 2015Assignee: Nippon Steel & Sumikin Chemical Co., Ltd.Inventors: Masaki Komori, Takahiro Kai, Toshihiro Yamamoto
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Publication number: 20150041785Abstract: Provided is an organic electroluminescent device (EL device) using an indolocarbazole compound. The organic EL device is obtained by laminating an anode, a plurality of organic layers including a phosphorescent light-emitting layer, and a cathode on a substrate, and the phosphorescent light-emitting layer, a hole-transporting layer, an electron-transporting layer, a hole-blocking layer, or an electron-blocking layer contains an indolocarbazole compound represented by the general formula (1).Type: ApplicationFiled: February 28, 2013Publication date: February 12, 2015Inventors: Rumi Sannomiya, Takahiro Kai, Masaki Komori, Toshihiro Yamamoto
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Patent number: 8906521Abstract: Disclosed is a useful organic EL device which comprises a phosphorescent light-emitting layer and is endowed with improved luminous efficiency and high driving stability. Also disclosed is a hole-transporting material suitable for use in the phosphorescent light-emitting device. The hole-transporting material is a triptycene derivative which has substituents at the 9- and 10-positions and is substituted with an aromatic group containing at least one diarylamino group (—ArNAr2). The organic EL device contains the triptycene derivative in at least one organic layer selected from the group of a phosphorescent light-emitting layer, a hole-transporting layer, an electron-blocking layer, and an exciton-blocking layer. The diarylamino group (—NAr2) may be fused to form an aromatic heterocyclic group such as a carbazolyl group.Type: GrantFiled: January 15, 2010Date of Patent: December 9, 2014Assignee: Nippon Steel & Sumikin Chemical Co., Ltd.Inventors: Mitsuru Suda, Takahiro Kai, Toshihiro Yamamoto
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Patent number: 8857548Abstract: A work vehicle (1) includes an engine (11), a cooling device (12), first and second hoses (14, 15), first and second flanges (16a, 17a), and a third flange (18a). The third flange (18a) is arranged to overlap with the first and second flanges (16a, 17a) by extending in a region R sandwiched between the first flange (16a) and the second flange (17a). Accordingly, there can be obtained a work vehicle (1) that can have rain water intruding inside prevented from entering the engine side along the hose.Type: GrantFiled: August 10, 2012Date of Patent: October 14, 2014Assignee: Komatsu Ltd.Inventor: Toshihiro Yamamoto
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Patent number: 8859109Abstract: Disclosed is an organic electroluminescent device (organic EL device) that is improved in luminous efficiency, fully secured of driving stability, and of simple structure. The organic EL device comprises a light-emitting layer between an anode and a cathode piled one upon another on a substrate and the light-emitting layer comprises a phosphorescent dopant and a compound containing carbazolyl groups at both ends represented by the following formula (1) as a host material. In formula (1), X is independently CH optionally containing a substituent or N and L is a direct bond, an ethylene group, or an acetylene group.Type: GrantFiled: February 5, 2009Date of Patent: October 14, 2014Assignee: Nippon Steel & Sumikin Chemical Co., Ltd.Inventors: Yuichi Sawada, Takahiro Kai, Masaki Komori, Toshihiro Yamamoto
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Patent number: 8815416Abstract: Disclosed is an organic electroluminescent device (organic EL device) which is improved in luminous efficiency, fully secured of driving stability, and of simple constitution. Also disclosed is a compound useful for the fabrication of said organic electroluminescent device. This compound for organic electroluminescent device is a bipyrimidyl compound which has a basic skeleton of 2,2?-bipyrimidyl and is substituted by an aromatic hydrocarbon group, an aromatic heterocyclic group, or a substituted amino group. The aforementioned organic electroluminescent device has a light-emitting layer between an anode and a cathode which are piled one upon another on a substrate and the light-emitting layer contains a phosphorescent dopant and the aforementioned bipyrimidyl compound as a host material.Type: GrantFiled: December 24, 2008Date of Patent: August 26, 2014Assignee: Nippon Steel & Sumikin Chemical Co., Ltd.Inventors: Takahiro Kai, Junya Ogawa, Toshihiro Yamamoto
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Patent number: 8795848Abstract: Disclosed is an organic electroluminescent device (organic EL device) that is improved in the luminous efficiency, fully secured of the driving stability, and of a simple structure and also disclosed is a compound for organic EL device useful for the said device. The compound for organic EL device is, for example, an indolocarbazole derivative represented by the following general formula (3). The organic EL device comprises a light-emitting layer disposed between an anode and a cathode piled one upon another on a substrate and the said light-emitting layer comprises a phosphorescent dopant and the aforementioned indolocarbazole derivative as a host material. In general formula (3), L is an aromatic heterocyclic group of a fused-ring structure with a valence of (n+1), Ar1 to Ar3 each is an alkyl group, an aralkyl group, or a substituted or unsubstituted aromatic hydrocarbon or aromatic heterocyclic group, and n is an integer of 0-5.Type: GrantFiled: April 30, 2009Date of Patent: August 5, 2014Assignee: Nippon Steel & Sumikin Chemical Co., Ltd.Inventors: Takahiro Kai, Masaki Komori, Toshihiro Yamamoto
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Publication number: 20140190577Abstract: A work vehicle (1) includes an engine (11), a cooling device (12), first and second hoses (14, 15), first and second flanges (16a, 17a), and a third flange (18a). The third flange (18a) is arranged to overlap with the first and second flanges (16a, 17a) by extending in a region R sandwiched between the first flange (16a) and the second flange (17a). Accordingly, there can be obtained a work vehicle (1) that can have rain water intruding inside prevented from entering the engine side along the hose.Type: ApplicationFiled: August 10, 2012Publication date: July 10, 2014Applicant: KOMATSU LTD.Inventor: Toshihiro Yamamoto