Patents by Inventor Hidetoshi Nakata
Hidetoshi Nakata 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: 20170029655Abstract: It is an object of the present invention to provide a polymerizable compound suitable as a material for optically anisotropic bodies having excellent optical properties, a composition containing the polymerizable compound, a polymer obtained by polymerizing the polymerizable compound, an optically anisotropic body formed of the polymer, and a liquid crystal display device including the optically anisotropic body.Type: ApplicationFiled: November 27, 2014Publication date: February 2, 2017Applicant: DIC CORPORATIONInventors: Hiroshi HASEBE, Yoshio AOKI, Kunihiko KOTANI, Akihiro KOISO, Hidetoshi NAKATA
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Publication number: 20170003418Abstract: There is provided a compound containing a mesogenic group, which includes a silicon compound at a low concentration, a polymerizable compound containing the mesogenic group, a mixture and a composition using these compounds, a polymerizable mixture having the polymerizable compound, and a polymer, an optically anisotropic body, and a phase difference film using the polymerizable composition. It is possible to obtain the optically anisotropic body and the phase difference film having satisfactory scratch resistance and adhesion, by using the polymerizable composition composed of the compound containing a mesogenic group, which includes a silicon compound at a low concentration.Type: ApplicationFiled: December 18, 2014Publication date: January 5, 2017Applicant: DIC CorporationInventors: Mika Yamamoto, Yasuhiro Kuwana, Hidetoshi Nakata, Koichi Endou, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
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Publication number: 20170002123Abstract: It is an object of the present invention to provide a polymerizable compound suitable as a material for optically anisotropic bodies having excellent optical properties, a composition containing the polymerizable compound, a polymer obtained by polymerizing the polymerizable compound, an optically anisotropic body formed of the polymer, and a liquid crystal display device including the optically anisotropic body.Type: ApplicationFiled: November 27, 2014Publication date: January 5, 2017Applicant: DIC CORPORATIONInventors: Hiroshi Hasebe, Yoshio Aoki, Kunihiko Kotani, Akihiro Koiso, Hidetoshi Nakata
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Patent number: 9469810Abstract: The present invention relates to a polymerizable composition useful as a liquid crystal device, a display, an optical member, a coloring agent, a security marking, and a laser light emitting member and a thin film obtained from the polymerizable composition. The present invention provides a polymerizable liquid crystal composition having excellent solubility into a solvent, exhibiting good adhesion to a base material, and being capable of realizing a thin film having low haze and no variations and, in addition, provides a thin film having excellent appearance by using the polymerizable liquid crystal composition. The polymerizable liquid crystal composition according to the present invention is used and, thereby, a composition and a thin film having low haze and no variations and, at the same time, having excellent adhesion to a base material can be obtained at a low cost.Type: GrantFiled: November 21, 2012Date of Patent: October 18, 2016Assignee: DIC CORPORATIONInventors: Hidetoshi Nakata, Yasuhiro Kuwana, Hiroshi Hasebe, Kunihiko Kotani, Isa Nishiyama
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Publication number: 20160272888Abstract: An object of the present invention is to provide a polymerizable liquid crystal composition with which two characteristics of smoothness of a surface of an anisotropic optical body and orientation properties of liquid crystals can be simultaneously improved, when preparing an anisotropic optical body to be obtained by photopolymerization of the polymerizable liquid crystal composition. Specifically, an object of the present invention is to provide a polymerizable liquid crystal composition containing specific polymerizable compounds and a fluorine-based surfactant. In addition, an anisotropic optical body, a retardation film, an antireflective film, and a liquid crystal display element prepared using the polymerizable liquid crystal composition of the present invention are also provided.Type: ApplicationFiled: October 7, 2014Publication date: September 22, 2016Applicant: DIC CORPORATION (TOKYO)Inventors: Koichi Endou, Yasuhiro Kuwana, Hidetoshi Nakata, Mika Yamamoto, Kazuaki Hatsusaka
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Publication number: 20160237351Abstract: The present invention provides a method for producing a polymerizable liquid crystal composition which produces films being uncolored and having no cissinq and good alignment when applied to a substrate, and also provides a polymerizable liquid crystal composition produced by the method and an optically anisotropic body using the polymerizable liquid crystal composition. Specifically, the present invention provides a method for producing a polymerizable liquid crystal composition, the method comprising a step (I) of preparing a polymerizable solution by mixing at least, one polymerizable compound having at least one polymerizable functional group and one or two or more organic solvents and heating and stirring the resultant mixture; and a step (II) of mixing the polymerizable solution with a polymerization initiator, and also provides a polymerizable liquid crystal composition produced by the method and an optically anisotropic body using the polymerizable liquid crystal composition.Type: ApplicationFiled: October 7, 2014Publication date: August 18, 2016Applicant: DIC CORPORATIONInventors: Koichi Endou, Yasuhiro Kuwana, Hidetoshi Nakata, Mika Yamamoto, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
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Publication number: 20160115338Abstract: The present invention provides a polymerizable composition solution that has good storage stability and allows a polymerizable compound in the polymerizable composition to be aligned well with no defects after application to a base and removal of a solvent by a drying process and also provides an optically anisotropic body that includes the solution and has good alignment without any defects. The present invention provides a solution containing a polymerizable composition and an organic solvent, wherein the polymerizable composition contains 90 mass % or more of a polymerizable compound intramolecularly having a 2-methyl-1,4-phenylene group as represented by general formula (1) and provides an optically anisotropic body including the solution.Type: ApplicationFiled: May 23, 2014Publication date: April 28, 2016Applicant: DIC CorporationInventors: Yasuhiro Kuwana, Hidetoshi Nakata, Koichi Endou, Mika Yamamoto, Kunihiko Kotani, Hiroshi Hasebe, Yoshiyuki Ono
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Publication number: 20140256896Abstract: The present invention relates to a polymerizable composition useful as a liquid crystal device, a display, an optical member, a coloring agent, a security marking, and a laser light emitting member and a thin film obtained from the polymerizable composition. The present invention provides a polymerizable liquid crystal composition having excellent solubility into a solvent, exhibiting good adhesion to a base material, and being capable of realizing a thin film having low haze and no variations and, in addition, provides a thin film having excellent appearance by using the polymerizable liquid crystal composition. The polymerizable liquid crystal composition according to the present invention is used and, thereby, a composition and a thin film having low haze and no variations and, at the same time, having excellent adhesion to a base material can be obtained at a low cost.Type: ApplicationFiled: November 21, 2012Publication date: September 11, 2014Inventors: Hidetoshi Nakata, Yasuhiro Kuwana, Hiroshi Hasebe, Kunihiko Kotani, Isa Nishiyama
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Patent number: 8361343Abstract: The present invention provides a nematic liquid crystal composition suitable for a bistable nematic liquid crystal display. A bistable nematic liquid crystal display having a wide nematic phase temperature range and operating temperature range can be obtained by using a nematic liquid crystal composition comprising at least 20% by weight of a specific liquid crystal compound (A) having a polar group and 5 to 50% by weight of a specific liquid crystal compound (B) not having a polar group, along with comprising, in the compound (B), at least 3% by weight of a specific liquid crystal compound having a alkenyl group.Type: GrantFiled: May 16, 2008Date of Patent: January 29, 2013Assignees: DIC Corporation, NemopticInventors: Hidetoshi Nakata, Takeshi Kuriyama, Kiyofumi Takeuchi, Haruyoshi Takatsu, Daniel Stoenescu, Jean-Claude Dubois, Ivan Dozov
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Patent number: 8252202Abstract: A nematic liquid crystal composition of the present invention includes at least 20% by weight of one, or two or more compounds selected from compound group A; and 5 to 50% by weight of one, or two or more compounds selected from compound group B, wherein the relative proportions of the above-mentioned compounds used in the nematic liquid crystal composition is determined to simultaneously obtain the specific physical characteristics for the composition, and an anchoring breaking voltage U?/4 is less than or equal to 25 V when the product (?n·d) of the refractive index anisotropy (?n) at 20° C. and the thickness (d) is 140 nm and the liquid crystal composition is confined between two substrates for a bistable nematic liquid crystal display in which at least one of the substrates have a weak zenithal anchoring force.Type: GrantFiled: May 16, 2008Date of Patent: August 28, 2012Assignees: DIC Corporation, NemopticInventors: Hidetoshi Nakata, Kiyofumi Takeuchi, Haruyoshi Takatsu, Daniel Stoenescu, Ivan Dozov, Jean-Claude Dubois
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Patent number: 8017511Abstract: Etching is performed on an insulating layer 23 and a conductive layer 32 with a photoresist 41 as the mask, to form an opening 51 in the conductive layer 32. After removing the photoresist 41, another insulating layer 24 is formed all over, which is etched back so as to expose a surface of a conductive layer 31, to thereby cover the inner wall of the opening 51. Then etching is performed on the conductive layer 31 with the latter insulating layer 24 as the mask, so as to form another opening 52 in the conductive layer 31. Then still another insulating layer 25 is formed all over, which is then etched back so as to expose a surface of the conductive layer 32, to thereby fill the opening 52 with the last formed insulating layer 25.Type: GrantFiled: March 10, 2008Date of Patent: September 13, 2011Assignee: Renesas Electronics CorporationInventor: Hidetoshi Nakata
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Publication number: 20110211148Abstract: A nematic liquid crystal composition of the present invention includes at least 20% by weight of one, or two or more compounds selected from compound group A; and 5 to 50% by weight of one, or two or more compounds selected from compound group B, wherein the relative proportions of the above-mentioned compounds used in the nematic liquid crystal composition is determined to simultaneously obtain the specific physical characteristics for the composition, and an anchoring breaking voltage U?/4 is less than or equal to 25 V when the product (?n·d) of the refractive index anisotropy (?n) at 20° C. and the thickness (d) is 140 nm and the liquid crystal composition is confined between two substrates for a bistable nematic liquid crystal display in which at least one of the substrates have a weak zenithal anchoring force.Type: ApplicationFiled: May 16, 2008Publication date: September 1, 2011Applicants: DIC CORPORATION, NEMOPTICInventors: Hidetoshi Nakata, Kiyofumi Takeuchi, Haruyoshi Takatsu, Daniel Stoenescu, Ivan Dozov, Jean-Claude Dubois
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Publication number: 20100201930Abstract: The present invention provides a nematic liquid crystal composition suitable for a bistable nematic liquid crystal display. A bistable nematic liquid crystal display having a wide nematic phase temperature range and operating temperature range can be obtained by using a nematic liquid crystal composition comprising at least 20% by weight of a specific liquid crystal compound (A) having a polar group and 5 to 50% by weight of a specific liquid crystal compound (B) not having a polar group, along with comprising, in the compound (B), at least 3% by weight of a specific liquid crystal compound having a alkenyl group.Type: ApplicationFiled: May 16, 2008Publication date: August 12, 2010Applicants: DIC CORPORATION, NEMOPTICInventors: Hidetoshi Nakata, Takeshi Kuriyama, Kiyofumi Takeuchi, Haruyoshi Takatsu, Daniel Stoenescu, Jean-Claude Dubois, Ivan Dozov
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Publication number: 20080160758Abstract: Etching is performed on an insulating layer 23 and a conductive layer 32 with a photoresist 41 as the mask, to form an opening 51 in the conductive layer 32. After removing the photoresist 41, another insulating layer 24 is formed all over, which is etched back so as to expose a surface of a conductive layer 31, to thereby cover the inner wall of the opening 51. Then etching is performed on the conductive layer 31 with the latter insulating layer 24 as the mask, so as to form another opening 52 in the conductive layer 31. Then still another insulating layer 25 is formed all over, which is then etched back so as to expose a surface of the conductive layer 32, to thereby fill the opening 52 with the last formed insulating layer 25.Type: ApplicationFiled: March 10, 2008Publication date: July 3, 2008Applicant: NEC ELECTRONICS CORPORATIONInventor: Hidetoshi NAKATA
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Patent number: 7375018Abstract: Etching is performed on an insulating layer 23 and a conductive layer 32 with a photoresist 41 as the mask, to form an opening 51 in the conductive layer 32. After removing the photoresist 41, another insulating layer 24 is formed all over, which is etched back so as to expose a surface of a conductive layer 31, to thereby cover the inner wall of the opening 51. Then etching is performed on the conductive layer 31 with the latter insulating layer 24 as the mask, so as to form another opening 52 in the conductive layer 31. Then still another insulating layer 25 is formed all over, which is then etched back so as to expose a surface of the conductive layer 32, to thereby fill the opening 52 with the last formed insulating layer 25.Type: GrantFiled: March 1, 2006Date of Patent: May 20, 2008Assignee: NEC Electronics CorporationInventor: Hidetoshi Nakata
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Patent number: 7112290Abstract: A chiral nematic liquid crystal composition has minimal temperature dependency of the natural pitch and temperature dependency of the wavelength selective reflection and low temperature storage stability thereof is excellent. A chiral nematic liquid crystal composition with a broad liquid crystal temperature range is used in a bistable liquid crystal display element, and a bistable liquid crystal display element comprising the liquid crystal composition. The chiral nematic liquid crystal composition comprises optically active compounds represented by general formula (I-a) and general formula (II-a): R2P1-L1SP2-L2-P3—R3??(II-a) wherein the general formula (II-a) has the same helical twisting direction as the general formula (I-a), and shows a positive temperature dependency for the natural pitch, and a HTP value of at least 3. A bistable liquid crystal display element comprises the liquid crystal composition.Type: GrantFiled: October 6, 2003Date of Patent: September 26, 2006Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Hidetoshi Nakata, Kiyofumi Takeuchi
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Patent number: 7108896Abstract: A method of increasing helical twisting power (HTP) in an optically active compound used in a liquid crystal material is provided. An optically active compound which exhibits a large HTP value is also provided. Furthermore, a liquid crystal composition which exhibits a high upper temperature limit of the liquid crystal after the addition of the optically active compound, and a liquid crystal display device using the same are provided. In a method, an HTP of a compound having a partial structure represented by formula (A), which has an asymmetric carbon atom, is increased by replacing the partial structure represented by formula (A) by a partial structure represented by formula (B) (wherein * represents the position of an asymmetric carbon atom, Y1 represents a substituent such as an alkyl group and a halogen).Type: GrantFiled: June 24, 2003Date of Patent: September 19, 2006Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Hidetoshi Nakata, Makoto Sasaki, Kiyofumi Takeuchi, Haruyoshi Takatsu
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Publication number: 20060199391Abstract: Etching is performed on an insulating layer 23 and a conductive layer 32 with a photoresist 41 as the mask, to form an opening 51 in the conductive layer 32. After removing the photoresist 41, another insulating layer 24 is formed all over, which is etched back so as to expose a surface of a conductive layer 31, to thereby cover the inner wall of the opening 51. Then etching is performed on the conductive layer 31 with the latter insulating layer 24 as the mask, so as to form another opening 52 in the conductive layer 31. Then still another insulating layer 25 is formed all over, which is then etched back so as to expose a surface of the conductive layer 32, to thereby fill the opening 52 with the last formed insulating layer 25.Type: ApplicationFiled: March 1, 2006Publication date: September 7, 2006Inventor: Hidetoshi Nakata
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Patent number: 6770533Abstract: Provided are a method of manufacturing a semiconductor, a nonvolatile semiconductor memory device and a method of manufacturing the same, wherein: the memory device has a plurality of memory cells; a buried diffusion layer serves as a signal line; and, a buried diffusion layer disposed adjacent to each of opposite end portions of a lower floating gate is free from variations in width resulted from misalignment occurring in an optical aligner. In the memory device, for example: the floating gate is formed in an active region of a P-type semiconductor substrate through a gate oxide film; an N-type drain region and an N-type source region are formed in opposite end portions of the floating gate; and, a pair of device isolation shielding electrode extends in parallel with the floating gate outside both the drain region and the source region to cover adjacent ones of the memory cells.Type: GrantFiled: February 27, 2002Date of Patent: August 3, 2004Assignee: NEC Electronics CorporationInventors: Yoshiaki Hisamune, Hidetoshi Nakata
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Publication number: 20040076769Abstract: A chiral nematic liquid crystal composition has minimal temperature dependency of the natural pitch and temperature dependency of the wavelength selective reflection and low temperature storage stability thereof is excellent. A chiral nematic liquid crystal composition with a broad liquid crystal temperature range is used in a bistable liquid crystal display element, and a bistable liquid crystal display element comprising the liquid crystal composition.Type: ApplicationFiled: October 6, 2003Publication date: April 22, 2004Applicant: DAINIPPON INK AND CHEMICALS, INC.Inventors: Hidetoshi Nakata, Kiyofumi Takeuchi