Patents by Inventor Haruyoshi Takatsu
Haruyoshi Takatsu 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: 20080149889Abstract: A nematic liquid crystal composition having a negative dielectric constant anisotropy, comprising one or more compounds selected from the compounds represented by (IA) and (IB) of 10-70% by mass, one or more compounds selected from the compounds represented by (IIA) to (IID) of 10-70% by mass, the total content of one or more compounds selected from the compounds represented by (IA) to (IID) being 35-80% by mass, and a compound represented by (III) of 20-65% by mass: wherein R1 to R14 each independently represents an alkyl group having 1 to 10 carbon atoms, etc.; Z1 to Z11 each independently represents a single bond, etc.; Z1 to Z6 and Z9 to Z11 each independently represents —CF2O—, etc.; l and m represent 0 or 1; rings A, B, C and D represent a trans-1,4-cyclohexylene group, etc.; and rings B, C and D represent a trans-1,4-cyclohexenylene group.Type: ApplicationFiled: December 19, 2003Publication date: June 26, 2008Applicant: DAINIPPON INK AND CHEMICALS, INC.Inventors: Yoshikiyo Tanaka, Kiyofumi Takeuchi, Haruyoshi Takatsu
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Patent number: 7198827Abstract: A nematic liquid crystal composition comprising compounds of the general formulas (I-1) to (I-5) each having naphthalene-2,6-diyl, decahydronaphthalene-2,6-diyl and 1,2,3,4-tetrahydronaphthalene-2,6-diyl, and a liquid display device using the same. This nematic liquid crystal composition broadens the operating temperature range of liquid crystal display characteristics due to an improvement in co-solubility and storage at low temperature, thereby making it possible to improve a reduction in driving voltage and a change in temperature and to attain comparatively fast response characteristics for a predetermined driving voltage. Accordingly, the nematic liquid crystal composition is best suited for use as TN, STN, TFT, IPS, MVA, OCB, ECB, PC, PNLC, PDLC, PSCT or the like.Type: GrantFiled: September 10, 1999Date of Patent: April 3, 2007Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Kiyofumi Takeuchi, Haruyoshi Takatsu, Hirokazu Yanagihara
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Patent number: 7145047Abstract: Disclosed in a novel liquid-crystalline compound which is a naphthalene derivative useful as an electro-optical liquid crystal display material, a liquid crystal composition containing such naphthalene derivatives and a liquid crystal display device comprising the same. The naphthalene derivative provided by the present invention exhibits an excellent liquid-crystallinity and miscibility with currently widely used liquid crystal compositions or compositions. The addition of the naphthalene derivative makes it possible to drastically lower the threshold voltage of the liquid crystal composition while maintaining its high response. The naphthalene derivative of the present invention is characterized by a large birefringence index. Further, most of the naphthalene derivative of the present invention has no strongly polar group in its molecule and thus can also be used for active matrix driving.Type: GrantFiled: August 21, 2002Date of Patent: December 5, 2006Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Sadao Takehara, Masashi Osawa, Haruyoshi Takatsu, Makoto Negishi
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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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Patent number: 7067179Abstract: A novel compound represented by the general formula (I), and a nematic liquid crystal composition incorporating the same. A compound represented by the general formula (I) can be produced industrially extremely easily, as shown in the examples, displays superior compatibility with current general purpose host liquid crystals as a nematic phase, and also shows little crystal precipitation at low temperatures. Moreover, by addition of a small amount of such a compound to a host liquid crystal, the liquid crystal temperature range at low temperatures can be effectively widened without any significant worsening of the various characteristics of the liquid crystal material. Consequently, a compound of the present invention is an extremely useful liquid crystal material which is suitable for various liquid crystal display elements which require a broad operating temperature range.Type: GrantFiled: September 10, 1999Date of Patent: June 27, 2006Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shinji Ogawa, Tatsuo Kawara, Sadao Takehara, Hiroyuki Ohnishi, Kiyofumi Takeuchi, Haruyoshi Takatsu, Gerwald Grahe, Rainer Bruno Frings, Christine Fugger, Cornelia Pithart
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Patent number: 6913797Abstract: The present invention discloses a decahydronaphthalene derivative represented by general formula (I): a liquid crystal composition in which it is contained, and a liquid crystal device in which it is used. The novel decahydronaphthalene derivative of the present invention can be produced industrially extremely easily as shown in the examples, and by adding a small amount to a base liquid crystal, it is possible to have effects that expand the nematic phase temperature range, thereby improving its various characteristics as a nematic liquid crystal. Moreover, the novel decahydronaphthalene derivative of the present invention also has superior co-solubility with base liquid crystals generally used at present. Thus, it is suitable for various types of liquid crystal devices requiring a wide operating temperature range, and is extremely useful as a liquid crystal material.Type: GrantFiled: August 23, 1999Date of Patent: July 5, 2005Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shinji Ogawa, Hiroyuki Ohnishi, Yutaka Nagashima, Sadao Takehara, Makoto Negishi, Haruyoshi Takatsu, Gerwald Grahe, Rainer Bruno Frings, Christine Fugger, Cornelia Pithart
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Patent number: 6746728Abstract: A tetrahydronaphthalene derivative represented by the general formula (I) and a liquid crystal composition containing the same. A compound represented by the general formula (I) shows superior liquid crystallinity and co-solubility with conventional liquid crystal compounds and compositions. Furthermore, addition of such a compound enables the threshold voltage to be significantly reduced with almost no deleterious effect on the responsiveness. In addition, a compound of the present invention can also be easily produced industrially, is colorless, and is chemically stable. Consequently, liquid crystal compositions containing such a compound are extremely useful as liquid crystals, and are particularly suitable for liquid crystal displays requiring a wide operating temperature range, low voltage driving and a high response speed.Type: GrantFiled: December 28, 2001Date of Patent: June 8, 2004Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Tetsuo Kusumoto, Yoshitaka Saito, Makoto Negishi, Yutaka Nagashima, Sadao Takehara, Haruyoshi Takatsu, Gerwald Grahe, Rainer Bruno Frings, Cornelia Pithart
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Patent number: 6693223Abstract: A novel liquid crystal compound, a nematic liquid crystal composition, and a liquid crystal display system using the composition are disclosed herein. The liquid crystal compound is represented by the general formula (I): wherein R represents a hydrogen atom or a straight chain alkyl group having 1 to 7 carbon atoms and each of X, Y and Z independently represents hydrogen atom or fluorine atom. The nematic liquid crystal composition of the present invention can provide liquid crystal materials in response to desired purposes even by its addition in a small amount without spoiling other characteristics.Type: GrantFiled: February 27, 2003Date of Patent: February 17, 2004Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Kiyofumi Takeuchi, Haruyoshi Takatsu, Sadao Takehara, Masashi Osawa
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Publication number: 20040021128Abstract: 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).Type: ApplicationFiled: June 24, 2003Publication date: February 5, 2004Applicant: Dainippon Ink and Chemicals, Inc.Inventors: Hidetoshi Nakata, Makoto Sasaki, Kiyofumi Takeuchi, Haruyoshi Takatsu
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Patent number: 6620467Abstract: A supertwisted nematic liquid crystal display having twist angle of 180 to 270° C. and comprising: a pair of substrates each having an orientation-controlling layer and a transparent electrodel; a liquid crystal layer comprising a liquid crystal composition, which is sandwiched by the substrates; and at least one polarizing sheet provided on at least one of the substrates, wherein the liquid crystal composition comprises: at least one compound represented by formula (I): and at least one compound represented by formula (II): and wherein said liquid crystal composition has a nematic-isotropic phase transition temperature of 75 to 150° C. and a refractive index anisotropy (&Dgr;n) of 0.07 to 0.25. The symbols in formulae (I) and (II) are defined in the specification.Type: GrantFiled: July 25, 2001Date of Patent: September 16, 2003Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Go Sudo, Shotaro Kawakami, Haruyoshi Takatsu, Hiroyuki Ohnishi, Naoe Katoh
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Patent number: 6607791Abstract: A liquid crystal composition comprises as a first liquid crystal component a compound represented by the following general formula (I): and as a second liquid crystal component a compound selected from the group consisting of compounds represented by the following general formulae (II) and (III): and has a nematic phase upper temperature limit of 75° C. or higher and &Dgr;n of from 0.07 to 0.18.Type: GrantFiled: October 27, 2000Date of Patent: August 19, 2003Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Shinji Ogawa, Masashi Osawa, Hiroyuki Ohnishi, Haruyoshi Takatsu, Kiyofumi Takeuchi, Shotaro Kawakami, Takeshi Kuriyama
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Publication number: 20030136944Abstract: Disclosed in a novel liquid-crystalline compound which is a naphthalene derivative useful as an electro-optical liquid crystal display material, a liquid crystal composition containing such naphthalene derivatives and a liquid crystal display device comprising the same. The naphthalene derivative provided by the present invention exhibits an excellent liquid-crystallinity and miscibility with currently widely used liquid crystal compositions or compositions. The addition of the naphthalene derivative makes it possible to drastically lower the threshold voltage of the liquid crystal composition while maintaining its high response. The naphthalene derivative of the present invention is characterized by a large birefringence index. Further, most of the naphthalene derivative of the present invention has no strongly polar group in its molecule and thus can also be used for active matrix driving.Type: ApplicationFiled: August 21, 2002Publication date: July 24, 2003Applicant: Dainippon Ink and Chemicals, Inc.Inventors: Sadao Takehara, Masashi Osawa, Haruyoshi Takatsu, Makoto Negishi
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Patent number: 6562421Abstract: A supertwisted nematic liquid crystal display comprising: a pair of substrates each having a liquid crystal orientation-controlling layer and a transparent electrode; a liquid crystal material held between said substrates; and at least one polarizing sheet provided on at least one of said substrates, wherein said liquid crystal material comprises: (a) a compound represented by formula (I): and (b) at least one compound selected from the group consisting of: compounds represented by formula (II): and compounds represented by formula (III):Type: GrantFiled: August 29, 2001Date of Patent: May 13, 2003Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Go Sudo, Takeshi Kuriyama, Shotaro Kawakami, Hiroyuki Ohnishi, Haruyoshi Takatsu
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Publication number: 20020163487Abstract: A supertwisted nematic liquid crystal display comprising: a pair of substrates each having a liquid crystal orientation-controlling layer and a transparent electrode; a liquid crystal material held between said substrates; and at least one polarizing sheet provided on at least one of said substrates, wherein said liquid crystal material comprises: (a) a compound represented by formula (I): 1Type: ApplicationFiled: August 29, 2001Publication date: November 7, 2002Applicant: DAINIPPON INK AND CHEMICALS, INCInventors: Go Sudo, Takeshi Kuriyama, Shotaro Kawakami, Hiroyuki Ohnishi, Haruyoshi Takatsu
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Patent number: 6468607Abstract: Disclosed is a novel liquid-crystalline compound which is a naphthalene derivative useful as an electro-optical liquid crystal display material, a liquid crystal composition containing such naphthalene derivatives and a liquid crystal display device comprising the same. The naphthalene derivative provided by the present invention exhibits an excellent liquid-crystallinity and miscibility with currently widely used liquid crystal compositions or compositions. The addition of the naphthalene derivative makes it possible to drastically lower the threshold voltage of the liquid crystal composition while maintaining its high response. The naphthalene derivative of the present invention is characterized by a large birefringence index. Further, most of the naphthalene derivative of the present invention has no strongly polar group in its molecule and thus can also be used for active matrix driving.Type: GrantFiled: April 22, 1999Date of Patent: October 22, 2002Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Sadao Takehara, Masashi Osawa, Haruyoshi Takatsu, Makoto Negishi
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Publication number: 20020053659Abstract: A novel liquid crystal compound, a nematic liquid crystal composition, and a liquid crystal display system using the composition are disclosed herein.Type: ApplicationFiled: April 6, 2001Publication date: May 9, 2002Applicant: DAINIPPON INK AND CHEMICALS, INC.Inventors: Kiyofumi Takeuchi, Haruyoshi Takatsu, Sadao Takehara, Masashi Osawa
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Publication number: 20020033929Abstract: A supertwisted nematic liquid crystal display having twist angle of 180 to 270° C.Type: ApplicationFiled: July 25, 2001Publication date: March 21, 2002Applicant: Dainippon Ink and Chemicals, Inc.Inventors: Go Sudo, Shotaro Kawakami, Haruyoshi Takatsu, Hiroyuki Ohnishi, Naoe Katoh
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Patent number: 6287646Abstract: A novel liquid crystal compound, a nematic liquid crystal composition, and a liquid crystal display system using the composition are disclosed herein. The liquid crystal compound is represented by the general formula (I): wherein R represents a hydrogen atom or a straight chain alkyl group having 1 to 7 carbon atoms and each of X, Y and Z independently represents hydrogen atom or fluorine atom. The nematic liquid crystal composition of the present invention can provide liquid crystal materials in response to desired purposes even by its addition in a small amount without spoiling other characteristics.Type: GrantFiled: November 30, 1998Date of Patent: September 11, 2001Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Kiyofumi Takeuchi, Haruyoshi Takatsu, Sadao Takehara, Masashi Osawa
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Patent number: 6010642Abstract: Disclosed is to provide an azine derivative as a novel liquid crystal compound, a novel process for the preparation of an asymmetrical azine in a high reaction yield with an extremely small amount of by-products such as symmetrical azines, a nematic liquid crystal composition containing the azine derivative which exhibits a broad driving temperature range and an excellent response for the desired high birefringence index, a liquid crystal display device such as TN-LCD, STN-LCD and TFT-LCD having improved electro-optical properties comprising the liquid crystal composition as a constituent material, and a light-scattering type liquid crystal display system which exhibits a suppressed memory phenomenon, a higher uniformity in turbidity for display and improved display properties and response against temperature change while maintaining and improving the required display properties such as fast switching time, lower voltage driving, higher light-control layer resistivity and higher contrast ratio even in the forType: GrantFiled: August 21, 1997Date of Patent: January 4, 2000Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Haruyoshi Takatsu, Sadao Takehara, Kiyofumi Takeuchi, Makoto Negishi, Norie Osawa, Masashi Osawa, Shinji Ogawa, Hirokazu Yanagihara
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Patent number: 5863457Abstract: The present invention provides a novel polymerizable liquid crystal composition which can be used as an optical material, display material or recording material. More particularly, the present invention provides an optically anisotropic film comprising a photopolymerization product of such a polymerizable liquid crystal composition having a high orientation state fixed therein which functions to control light and is suitable for the application in the field of optoelectronics, liquid crystal display, etc. The present invention further provides a process for the preparation of such an optically anisotropic film. Moreover, the present invention provides a liquid crystal device comprising the foregoing optically anisotropic film.Type: GrantFiled: June 4, 1996Date of Patent: January 26, 1999Assignee: Dainippon Ink and Chemicals, Inc.Inventors: Hiroshi Hasebe, Haruyoshi Takatsu, Kiyofumi Takeuchi