Patents by Inventor Shigetaka Numazawa
Shigetaka Numazawa 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: 10738019Abstract: There is provided a compound represented by the following general formula (1). [Chem. 1] (X)(Z)??(1) (in which, X represents a basic dye having at least one amino group having 0 to 20 carbon atoms which may have a substituent, and Z represents a non-coloring anion including an amino acid.Type: GrantFiled: August 28, 2019Date of Patent: August 11, 2020Assignee: HODOGAYA CHEMICAL CO., LTD.Inventors: Keigo Naito, Yasuaki Miyazaki, Shigetaka Numazawa, Katsumi Abe
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Publication number: 20200071283Abstract: There is provided a compound represented by the following general formula (1). [Chem. 1] (X)(Z) ??(1) (in which, X represents a basic dye having at least one amino group having 0 to 20 carbon atoms which may have a substituent, and Z represents a non-coloring anion including an amino acid.Type: ApplicationFiled: August 28, 2019Publication date: March 5, 2020Inventors: Keigo NAITO, Yasuaki MIYAZAKI, Shigetaka NUMAZAWA, Katsumi ABE
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Patent number: 9985216Abstract: According to the present invention, there are provided an indenoindole derivative represented by the following general formula (1); and an organic electroluminescent element including a pair of electrodes and at least one organic layer sandwiched therebetween, wherein the above compound is used as a constituent material for the at least one organic layer. The indenoindole derivative of the present invention provides an organic compound, which is excellent in hole injection/transport performance, has electron blocking capability, is highly stable in a thin film state, and excels in heat resistance, as a material for a high efficiency, high durability organic electroluminescent element. An organic electroluminescent element formed using this compound is highly efficient and highly durable.Type: GrantFiled: June 4, 2014Date of Patent: May 29, 2018Assignee: HODOGAYA CHEMICAL CO., LTD.Inventors: Makoto Nagaoka, Shigetaka Numazawa, Norimasa Yokoyama, Si In Kim, Shigeru Kusano
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Patent number: 9871210Abstract: Naphthotriazole derivatives represented by the following general formula (1), wherein, Ar1 is an aromatic hydrocarbon group or an aromatic heterocyclic group, and A is a group that contains an aromatic heterocyclic group. The compound features excellent electron injection/transporting capability, a high hole-blocking power and a high stability in the form of a thin film, and can be used as a material for producing highly efficient and highly durable organic electroluminescent devices.Type: GrantFiled: February 20, 2014Date of Patent: January 16, 2018Assignee: HODOGAYA CHEMICAL CO., LTD.Inventors: Makoto Nagaoka, Shigetaka Numazawa, Mari Toriya, Shingo Ozawa, Shigeru Kusano
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Patent number: 9842999Abstract: A Benzotriazole derivative represented by the following general formula (1), wherein, Ar1 is a monovalent aromatic hydrocarbon group or aromatic heterocyclic group, Ar2 is a hydrogen atom, a deuterium atom, or a monovalent aromatic hydrocarbon group or aromatic heterocyclic group, A is a divalent aromatic hydrocarbon group or aromatic heterocyclic group, B is a divalent condensed polycyclic aromatic hydrocarbon group or a single bond, and C is a monovalent aromatic heterocyclic group, and wherein if A is a phenylene group, B is a divalent condensed polycyclic aromatic hydrocarbon group or C is a monovalent aromatic heterocyclic group other than a pyridyl group.Type: GrantFiled: July 24, 2014Date of Patent: December 12, 2017Assignee: HODOGAYA CHEMICAL CO., LTD.Inventors: Makoto Nagaoka, Shigetaka Numazawa, Kanae Otsuka, Shigeru Kusano
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Publication number: 20160164001Abstract: A Benzotriazole derivative represented by the following general formula (1), wherein, Ar1 is a monovalent aromatic hydrocarbon group or aromatic heterocyclic group, Ar2 is a hydrogen atom, a deuterium atom, or a monovalent aromatic hydrocarbon group or aromatic heterocyclic group, A is a divalent aromatic hydrocarbon group or aromatic heterocyclic group, B is a divalent condensed polycyclic aromatic hydrocarbon group or a single bond, and C is a monovalent aromatic heterocyclic group, and wherein if A is a phenylene group, B is a divalent condensed polycyclic aromatic hydrocarbon group or C is a monovalent aromatic heterocyclic group other than a pyridyl group.Type: ApplicationFiled: July 24, 2014Publication date: June 9, 2016Applicant: HODOGAYA CHEMICAL CO., LTD.Inventors: Makoto NAGAOKA, Shigetaka NUMAZAWA, Kanae OTSUKA, Shigeru KUSANO
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Publication number: 20160126468Abstract: According to the present invention, there are provided an indenoindole derivative represented by the following general formula (1); and an organic electroluminescent element including a pair of electrodes and at least one organic layer sandwiched therebetween, wherein the above compound is used as a constituent material for the at least one organic layer. The indenoindole derivative of the present invention provides an organic compound, which is excellent in hole injection/transport performance, has electron blocking capability, is highly stable in a thin film state, and excels in heat resistance, as a material for a high efficiency, high durability organic electroluminescent element. An organic electroluminescent element formed using this compound is highly efficient and highly durable.Type: ApplicationFiled: June 4, 2014Publication date: May 5, 2016Applicant: HODOGAYA CHEMICAL CO., LTD.Inventors: Makoto NAGAOKA, Shigetaka NUMAZAWA, Norimasa YOKOYAMA, Si In KIM, Shigeru KUSANO
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Publication number: 20160005982Abstract: Naphthotriazole derivatives represented by the following general formula (1), wherein, Ar1 is an aromatic hydrocarbon group or an aromatic heterocyclic group, and A is a group that contains an aromatic heterocyclic group. The compound features excellent electron injection/transporting capability, a high hole-blocking power and a high stability in the form of a thin film, and can be used as a material for producing highly efficient and highly durable organic electroluminescent devices.Type: ApplicationFiled: February 20, 2014Publication date: January 7, 2016Applicant: HODOGAYA CHEMICAL CO., LTD.Inventors: Makoto NAGAOKA, Shigetaka NUMAZAWA, Mari TORIYA, Shingo OZAWA, Shigeru KUSANO
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Patent number: 9123897Abstract: Benzotriazole derivatives represented by the following general formula (1), wherein Ar1 and Ar2 are, for example, aromatic hydrocarbon groups or aromatic heterocyclic ring groups, and A is a group including a pyridine ring. The compounds excel in electron injection/transport capability, feature a high hole-blocking power and a high stability in their thin-film form, and are useful as materials for producing highly efficient and highly durable organic electroluminescent devices.Type: GrantFiled: October 5, 2012Date of Patent: September 1, 2015Assignee: HODOGAYA CHEMICAL CO., LTD.Inventors: Norimasa Yokoyama, Shigetaka Numazawa, Shirou Irisa, Shuichi Hayashi
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Publication number: 20140374721Abstract: Benzotriazole derivatives represented by the following general formula (1), wherein Ar1 and Ar2 are, for example, aromatic hydrocarbon groups or aromatic heterocyclic ring groups, and A is a group including a pyridine ring. The compounds excel in electron injection/transport capability, feature a high hole-blocking power and a high stability in their thin-film form, and are useful as materials for producing highly efficient and highly durable organic electroluminescent devices.Type: ApplicationFiled: October 5, 2012Publication date: December 25, 2014Applicant: HODOGAYA CHEMICAL CO., LTDInventors: Norimasa Yokoyama, Shigetaka Numazawa, Shirou Irisa, Shuichi Hayashi
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Patent number: 8722288Abstract: [Problems] To provide a novel compound which has a high carrier mobility and is useful as a charge-transporting agent that is not only capable of stably forming a photosensitive layer without precipitating crystals or forming pinholes at the time of forming the photosensitive layer but is also capable of forming an organic photosensitive material for electrophotography that has a high sensitivity and a low residual potential. [Means for Solution] A diphenylnaphthylamine derivative represented by the following general formula (1), wherein R1 to R3 are alkyl groups, k is an integer of 0 to 3, j is an integer of 0 to 4, l is an integer of 0 to 6, and X1 and X2 are hydrocarbon groups having at least one ethylenically unsaturated bond.Type: GrantFiled: November 4, 2010Date of Patent: May 13, 2014Assignee: Hodogaya Chemical Co., Ltd.Inventors: Shigetaka Numazawa, Katsumi Abe, Makoto Koike, Kiyotaka Ihara
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Publication number: 20130071780Abstract: [Problems] To provide a novel compound useful as an electric charge transporting agent having a high carrier mobility, and making it possible not only to stably form a photosensitive layer without precipitating crystals or developing pinholes when the photosensitive layer is being formed but also to prepare an organic photosensitive material for electrophotography featuring a high sensitivity and a low residual potential. [Means for Solution] The compound is represented by the following general formula (1); In the general formula (1), R1 to R7 are, for example, alkyl groups, X1 is, for example, —CH?CH—CH?CH2, X2 is, for example, —CH?CH2, and k and l are integers of 0 to 4.Type: ApplicationFiled: June 22, 2011Publication date: March 21, 2013Applicant: HODOGAYA CHEMICAL CO., LTD.Inventors: Shigetaka Numazawa, Katsumi Abe, Kiyotaka Ihara, Takehiro Nakajima, Makoto Koike
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Publication number: 20120208117Abstract: [Problems] To provide a novel compound which has a high carrier mobility and is useful as a charge-transporting agent that is not only capable of stably forming a photosensitive layer without precipitating crystals or forming pinholes at the time of forming the photosensitive layer but is also capable of forming an organic photosensitive material for electrophotography that has a high sensitivity and a low residual potential. [Means for Solution] A diphenylnaphthylamine derivative represented by the following general formula (1), wherein R1 to R3 are alkyl groups, k is an integer of 0 to 3, j is an integer of 0 to 4, l is an integer of 0 to 6, and X1 and X2 are hydrocarbon groups having at least one ethylenically unsaturated bond.Type: ApplicationFiled: November 4, 2010Publication date: August 16, 2012Applicant: HODOGAYA CHEMICAL CO., LTD.Inventors: Shigetaka Numazawa, Katsumi Abe, Makoto Koike, Kiyotaka Ihara
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Publication number: 20120052427Abstract: [Problems] To provide a novel compound having a high carrier mobility and is useful as a charge transporting agent which not only makes it possible to stably form a photosensitive layer without precipitating crystals or without developing pinholes when the photosensitive layer is being formed but also makes it possible to form an organic photosensitive material for electrophotography of a high sensitivity and a low residual potential. [Means for Solution] An indole derivative represented by the following general formula (1), wherein R1 and R2 are alkyl groups, k is an integer of 0 to 3, j is an integer of 0 to 4, a ring Z is a 5- to 6-membered ring and is, specifically, a cyclopentane ring, and X1 and X2 are hydrocarbon groups having at least one ethylenically unsaturated bond.Type: ApplicationFiled: July 21, 2010Publication date: March 1, 2012Applicant: HODOGAYA CHEMICAL CO., LTD.Inventors: Shigetaka Numazawa, Katsumi Abe, Kiyotaka Ihara, Takehiro Nakajima, Makoto Koike