Patents by Inventor Yasuhiko Shirota
Yasuhiko Shirota 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: 7629059Abstract: The invention provides an organo-electronic functional material comprising a tris(arylamino)benzene represented by the general formula (I) wherein A and B are each a group represented by the general formula (II) in which R is an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbon atoms and n is 0, 1, 2 or 3, and A and B may be the same or different from each other, and exhibiting a cyclic voltamogram in which a deviation of peak current of cyclic curves as measured 50 times at a sweep rate of 20 mV/s falls within ±10% of the average of peak current. The organo-electronic functional material has an opto-electronic exchanging function, a reversible oxidation-reduction property and a high glass transition temperature, and can form amorphous film in itself.Type: GrantFiled: November 17, 2004Date of Patent: December 8, 2009Assignee: Bando Chemical Industries, Ltd.Inventors: Nobutaka Akashi, Yasuhiko Shirota
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Publication number: 20090066222Abstract: The invention provides an organic electronic functional material which comprises a 1,3,5-tris(4-(N,N-diarylamino)phenyl)benzene represented by the general formula (I) wherein A and B are each preferably a phenyl group having an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbons at the 4-position.Type: ApplicationFiled: October 31, 2005Publication date: March 12, 2009Applicant: BANDO CHEMICAL INDUSTRIES, LTD.Inventors: Nobutaka Akashi, Kaori Inayama, Hiroshi Inada, Yasuhiko Shirota
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Patent number: 7196224Abstract: The invention provides 1,3,5-tris(arylamino)benzenes represented by the general formula (I) wherein A is naphthyl, anthryl, phenanthryl, biphenylyl or terphenylyl group, and R is alkyl having 1–6 carbon atoms or cycloalkyl group having five or six carbon atoms. The 1,3,5-tris(arylamino)benzenes have oxidation potentials in the range of about 0.5–0.6V, excellent reversibility in oxidation-reduction process and high glass transition temperatures and in addition, they are capable of forming stable and durable amorphous film useful as high performance organic semiconductors at normal temperatures or higher with no aid of binder resins, that is, by themselves.Type: GrantFiled: March 26, 2003Date of Patent: March 27, 2007Assignee: Bando Chemical Industries, Ltd.Inventors: Nobutaka Akashi, Hideki Norisada, Tomoko Hayashi, Yasuhiko Shirota
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Publication number: 20070066848Abstract: The invention provides an organo-electronic functional material comprising a tris(arylamino)benzene represented by the general formula (I) wherein A and B are each a group represented by the general formula (II) in which R is an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbon atoms and n is 0, 1, 2 or 3, and A and B may be the same or different from each other, and exhibiting a cyclic voltamogram in which a deviation of peak current of cyclic curves as measured 50 times at a sweep rate of 20 mV/s falls within ±10% of the average of peak current. The organo-electronic functional material has an opto-electronic exchanging function, a reversible oxidation-reduction property and a high glass transition temperature, and can form amorphous film in itself.Type: ApplicationFiled: November 17, 2004Publication date: March 22, 2007Applicant: Bando Chemical Industries, LTD.Inventors: Nobutaka Akashi, Yasuhiko Shirota
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Patent number: 7160634Abstract: An organic electroluminescent device having an organic layer between a pair of electrodes. The organic layer (in particular, a hole-transporting layer) has a polymer of a vinyl compound represented by the following formula (1): wherein R1 and R2 are the same or different, each representing a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group. The glass transition temperature of the polymer is about 200 to 250° C., and the polymer has high heat-resistance. Thus, the use of the polymer improves heat resistance of an organic EL device.Type: GrantFiled: October 14, 2005Date of Patent: January 9, 2007Assignees: Daicel Chemical Industries, Ltd.Inventors: Yasuhiko Shirota, Yutaka Ohsedo, Kazuyuki Moriwaki, Kenji Okumoto
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Patent number: 7038086Abstract: An organic electroluminescent device having an organic layer between a pair of electrodes. The organic layer (in particular, a hole-transporting layer) has a polymer of a vinyl compound represented by the following formula (1): wherein R1 and R2 are the same or different, each representing a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group. The glass transition temperature of the polymer is about 200 to 250° C., and the polymer has high heat-resistance. Thus, the use of the polymer improves heat resistance of an organic EL device.Type: GrantFiled: April 14, 2004Date of Patent: May 2, 2006Assignees: Daicel Chemical Industries, Ltd.Inventors: Yasuhiko Shirota, Yutaka Ohsedo, Kazuyuki Moriwaki, Kenji Okumoto
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Publication number: 20060049750Abstract: An organic electroluminescent device having an organic layer between a pair of electrodes. The organic layer (in particular, a hole-transporting layer) has a polymer of a vinyl compound represented by the following formula (1): wherein R1 and R2 are the same or different, each representing a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group. The glass transition temperature of the polymer is about 200 to 250° C., and the polymer has high heat-resistance. Thus, the use of the polymer improves heat resistance of an organic EL device.Type: ApplicationFiled: October 14, 2005Publication date: March 9, 2006Inventors: Yasuhiko Shirota, Yutaka Ohsedo, Kazuyuki Moriwaki, Kenji Okumoto
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Publication number: 20050090692Abstract: The invention provides 1,3,5-tris(arylamino)benzenes represented by the general formula (I) wherein A is naphthyl, anthryl, phenanthryl, biphenylyl or terphenylyl group, and R is alkyl having 1-6 carbon atoms or cycloalkyl group having five or six carbon atoms. The 1,3,5-tris(arylamino)benzenes have oxidation potentials in the range of about 0.5-0.6V, excellent reversibility in oxidation-reduction process and high glass transition temperatures and in addition, they are capable of forming stable and durable amorphous film useful as high performance organic semiconductors at normal temperatures or higher with no aid of binder resins, that is, by themselves.Type: ApplicationFiled: March 26, 2003Publication date: April 28, 2005Inventors: Nobutaka Akashi, Hideki Norisada, Tomoko Hayashi, Yasuhiko Shirota
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Publication number: 20040199016Abstract: An organic electroluminescent device having an organic layer between a pair of electrodes.Type: ApplicationFiled: April 14, 2004Publication date: October 7, 2004Applicants: Daicel Chemical Industries, Ltd., Yasuhiko ShirotaInventors: Yasuhiko Shirota, Yutaka Ohsedo, Kazuyuki Moriwaki, Kenji Okumoto
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Patent number: 6784318Abstract: An organic electroluminescent device has an organic layer between a pair of electrodes. The organic layer (in particular, a hole-transporting layer) has a polymer of a vinyl compound represented by the following formula (1): wherein R1 and R2 are the same or different, each representing a hydrogen atom, a halogen atom, an alkyl group or an alkoxy group. The glass transition temperature of the polymer is about 200 to 250° C., and the polymer has high heat-resistance. Thus, the use of the polymer improves heat resistance of an organic EL device.Type: GrantFiled: September 10, 2002Date of Patent: August 31, 2004Assignees: Yasuhiko Shirota, Daicel Chemical Industries Ltd.Inventors: Yasuhiko Shirota, Yutaka Ohsedo, Kazuyuki Moriwaki, Kenji Okumoto
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Publication number: 20040049080Abstract: Novel triphenylamines represented by the general formula (I) [wherein A is 1-naphthyl or 2-naphthyl]. These compounds exhibit stable amorphous properties in spite of their exhibiting grass transition temperatures of 100° C. or above, and are excellent in solubilities in organic solvents.Type: ApplicationFiled: July 30, 2003Publication date: March 11, 2004Inventors: Hiroshi Inada, Yoshiko Takahashi, Isao Kameno, Yasuhiko Shirota
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Publication number: 20030164678Abstract: An organic electroluminescent device comprises an organic layer between a pair of electrodes.Type: ApplicationFiled: September 10, 2002Publication date: September 4, 2003Inventors: Yasuhiko Shirota, Yutaka Ohsedo, Kazuyuki Moriwaki, Kenji Okumoto
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Patent number: 5508136Abstract: Novel trisarylaminobenzene derivatives are represented by the formula: ##STR1## wherein .PHI..sub.11, .PHI..sub.21, and .PHI..sub.31 are independently divalent aromatic ring residues, R.sub.11, R.sub.21, and R.sub.31 are independently groups represented by --N.PHI..sub.01 .PHI..sub.02, --NH.PHI..sub.01, --NR.sub.01 .PHI..sub.01, --.PHI..sub.01, --O.PHI..sub.01 or --S.PHI..sub.01 wherein each of .PHI..sub.01 and .PHI..sub.02 is a monovalent aromatic ring residue, and R.sub.01 is an alkyl group, at least one of R.sub.11, R.sub.21, and R.sub.31 being a group represented by --N.PHI..sub.01 .PHI..sub.02, --NH.PHI..sub.01 or --NR.sub.01 .PHI..sub.01, and A.sub.12, A.sub.22, and A.sub.32 are independently aromatic residues, alkyl groups or hydrogen. An organic electroluminescent element which uses the compound in an organic compound layer, especially in a hole injection transport layer provides uniform plane light emission and is durable enough to maintain luminance.Type: GrantFiled: February 10, 1994Date of Patent: April 16, 1996Assignees: Yasuhiko Shirota, TDK CorporationInventors: Yasuhiko Shirota, Kenji Nakaya, Tetsushi Inoue, Norihiro Okada, Kenryo Namba
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Patent number: 5374489Abstract: An organic electroluminescent device having an organic emitting layer and a hole transport layer laminated with each other and arranged between a cathode and an anode, and the hole transport layer is made of tris-phenothiazinyl-triphenylamine or tris-phenoxazinyl-triphenylamine derivative. The hole transport layer has a high heat-resistant property and high conductivity to improve durability and emits light at a high luminance and a high efficiency upon application of a low voltage.Type: GrantFiled: March 26, 1993Date of Patent: December 20, 1994Assignees: Pioneer Electronic Corporation, Yasuhiko Shirota, Bando Chemical Industries, Ltd.Inventors: Kunio Imai, Takeo Wakimoto, Yasuhiko Shirota, Hiroshi Inada, Tomokazu Kobata
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Patent number: 5256945Abstract: An organic EL element comprises a cathode, an EL layer of organic compound, a first hole transport layer of organic compound, a second hole transport layer of organic compound and an anode which are laminated in sequence, wherein the second hole transport layer is made of a substance represented by the following chemical formula 1: ##STR1## where R each independently represents a hydrogen atom, an alkyl group of from 1 to 6 carbon atoms, a halogen group, a cyano group, a nitro group, a primary, secondary or tertiary amino group, or an aryl group of from 6 to 15 carbon atoms. This organic EL element prevents a leakage current and emits light stably for a long time.Type: GrantFiled: December 13, 1991Date of Patent: October 26, 1993Assignee: Pioneer Electronic CorporationInventors: Kunio Imai, Masanao Shinkai, Takeo Wakimoto, Yasuhiko Shirota