Patents by Inventor Keisuke Ohta
Keisuke Ohta 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: 20180148693Abstract: The present invention relates to a method for culturing bone marrow cells, in which bone marrow cells are applied to a porous polyimide film and cultured. Moreover, the present invention relates to a porous polyimide film for healing a bone injury site.Type: ApplicationFiled: January 26, 2016Publication date: May 31, 2018Inventors: Keisuke OHTA, Shingo HIRASHIMA, Masahiko HAGIHARA, Motohisa SHIMIZU
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Publication number: 20180016391Abstract: The present invention is a polyether-based polymer composition includes: a polyether-based polymer including an oxirane monomer unit and having one cationic group substantially only at one terminal of a polymer chain, and a nanocarbon material. The polyether-based polymer composition of the present invention can be suitably used, for example, as a bucky gel or as a master batch for preparing a nanocarbon material aqueous dispersion in which a nanocarbon material is favorably dispersed.Type: ApplicationFiled: February 26, 2016Publication date: January 18, 2018Applicant: ZEON CORPORATIONInventors: The Ban Hoang, Keisuke Ohta, Shigetaka Hayano, Yasuo Tsunogae
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Patent number: 9870894Abstract: The present invention provides an embedding resin composition for electron microscopy having satisfactory performance as an embedding medium, including embedding performance and sectioning quality, and exhibiting excellent antistatic performance; and a method for observing a sample with an electron microscope using the composition. The embedding resin composition for electron microscopy of the present invention having antistatic performance comprises an ionic liquid and an embedding medium comprising an epoxy-based resin, a methacrylate resin or an unsaturated polyester resin. Preferably, the ionic liquid comprising a quaternary ammonium compound based on the formula (I): and an anion selected from the group consisting of BF4?, PF6?, (CF3SO2)2N?, a halide ion, a conjugate base of carboxylic acid, a conjugate base of sulfonic acid and a conjugate base of an inorganic acid.Type: GrantFiled: September 4, 2012Date of Patent: January 16, 2018Assignee: KURUME UNIVERSITYInventors: Keisuke Ohta, Toshiyuki Kiryu
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Patent number: 9819281Abstract: A voltage period calculator obtains an oscillation period of a voltage. A power source impedance estimating unit obtains an estimated value of a power source impedance from the oscillation period, an inductance, and a capacitance. A gain setting unit sets a control gain using the estimated value, the inductance, the capacitance, and a desired attenuation coefficient command, and outputs the control gain. A multiplier obtains a product of the control gain and the voltage. A subtractor subtracts the product from a command value to obtain a voltage control ratio command.Type: GrantFiled: June 15, 2015Date of Patent: November 14, 2017Assignee: DAIKIN INDUSTRIES, LTD.Inventor: Keisuke Ohta
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Patent number: 9735698Abstract: A voltage of a reactor taking a potential on a side of a capacitor as a reference is detected. A correction coefficient which is made smaller as a first voltage control rate command becomes smaller is calculated, the first voltage control rate being a ratio of an amplitude of an AC voltage, which is outputted by a power converter, to an average value of the DC voltage. A correction is made to subtract a correction amount obtained by multiplying the voltage of the reactor by the correction coefficient from the first voltage control rate command, so that a second voltage control rate command is generated. A switching signal which is generated based on a second voltage control rate command is given to the power converter.Type: GrantFiled: February 16, 2015Date of Patent: August 15, 2017Assignee: DAIKIN INDUSTRIES, LTD.Inventor: Keisuke Ohta
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Publication number: 20170117816Abstract: The attenuation coefficient of variations in voltage at a DC link is maintained at a desired value irrespective of the magnitude of an impedance on a side of a power source. A voltage period calculator (311) obtains an oscillation period (?) of a voltage (VL). A power source impedance estimating unit (312) obtains an estimated value (Z?) of a power source impedance (Z) from the oscillation period (?), an inductance (L), and a capacitance (C). A gain setting unit (313A) sets a control gain (k) using the estimated value (Z?), the inductance (L), the capacitance (C), and a desired attenuation coefficient command (?z), and outputs the control gain (k). A multiplier (321) obtains a product (k·VL) of the control gain (k) and the voltage (VL). A subtractor (322) subtracts the product (k·VL) from a command value (K**) to obtain a voltage control ratio command (K*).Type: ApplicationFiled: June 15, 2015Publication date: April 27, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventor: Keisuke OHTA
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Publication number: 20160359423Abstract: A voltage of a reactor taking a potential on a side of a capacitor as a reference is detected. A correction coefficient which is made smaller as a first voltage control rate command becomes smaller is calculated, the first voltage control rate being a ratio of an amplitude of an AC voltage, which is outputted by a power converter, to an average value of the DC voltage. A correction is made to subtract a correction amount obtained by multiplying the voltage of the reactor by the correction coefficient from the first voltage control rate command, so that a second voltage control rate command is generated. A switching signal which is generated based on a second voltage control rate command is given to the power converter.Type: ApplicationFiled: February 16, 2015Publication date: December 8, 2016Applicant: DAIKIN INDUSTRIES, LTD.Inventor: Keisuke OHTA
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Patent number: 9401656Abstract: A voltage of a reactor is detected. a correction is made on the basis of the voltage of the reactor so that a first voltage control rate command which is a ratio of an amplitude of an AC voltage to an average value of a DC voltage increases as a harmonic component of the DC voltage becomes higher and the first voltage control rate command decreases as an amplitude of an alternating current outputted from the power converter becomes larger, to generate a second voltage control rate command. A switching signal which is generated on the basis of the second voltage control rate command is given to the power converter.Type: GrantFiled: September 2, 2013Date of Patent: July 26, 2016Assignee: DAIKIN INDUSTRIES, LTD.Inventor: Keisuke Ohta
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Patent number: 9278348Abstract: A polyether compound containing oxirane monomer units in an average number per molecule of 5 to 200, wherein the polyether compound has a cationic group and cross-linkable group in the oxirane monomer units, and a cross-linkable composition containing this polyether compound and a cross-linking agent which enables cross-linking of the cross-linkable groups of the polyether compound are provided.Type: GrantFiled: March 30, 2012Date of Patent: March 8, 2016Assignee: ZEON CORPORATIONInventors: Shigetaka Hayano, Hiroyuki Yonemaru, Keisuke Ohta
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Publication number: 20160049260Abstract: A dye-sensitized solar cell element including a semiconductor electrode that includes an electrode substrate, and a metal oxide semiconductor porous film that is provided on the electrode substrate and supports a dye, a counter electrode that is disposed opposite to the semiconductor electrode, and an electrolyte layer that is provided between the semiconductor electrode and the counter electrode, the counter electrode including a nano-carbon material, and the electrolyte layer including a polyether compound that has a specific onium-structure repeating unit. The present invention makes it possible to provide a dye-sensitized solar cell element that exhibits high photoelectric conversion efficiency as compared with a known dye-sensitized solar cell element.Type: ApplicationFiled: March 20, 2014Publication date: February 18, 2016Applicant: ZEON CORPORATIONInventors: Keisuke OHTA, Shigetaka HAYANO
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Patent number: 9246398Abstract: A power converter includes a rectifier section, an inverter section, a capacitance element connected between inverter section input ends, an inductance element forming part of an LC filter with the capacitance element, a voltage detector detecting an inductance element voltage, and a controller controlling the inverter section based on the detected voltage. The LC filter has a resonance frequency set such that ripple current components contained in DC current outputted from the rectifier section passes through, and current components of a frequency equal to a carrier frequency of the inverter section are dampened. The controller controls the inverter section so that a transfer characteristic of input voltage of the inverter section versus the DC voltage from the rectifier section becomes a damping characteristic given by a phase lead element and a second-order lag element connected in series, and a damping coefficient of the transfer characteristic is set larger than 1.Type: GrantFiled: June 1, 2012Date of Patent: January 26, 2016Assignee: Daikin Industries, Ltd.Inventors: Kenichi Sakakibara, Keisuke Ohta
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Patent number: 9241099Abstract: A lens barrel (12) of a camera module (1) is provided with an electrode terminal which is connected to a focus adjusting device (11) and to an electrode terminal (32) of a holder (13). The electrode terminal (32) of the holder (13) faces the electrode terminal of the lens barrel (12) which electrode terminal changes in position in accordance with movement of the lens barrel (12) which movement is caused with the use of a lens barrel moving mechanism.Type: GrantFiled: October 10, 2013Date of Patent: January 19, 2016Assignee: SHARP KABUSHIKI KAISHAInventors: Keisuke Ohta, Yoshihiro Sohtome
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Publication number: 20150264248Abstract: A lens barrel (12) of a camera module (1) is provided with an electrode terminal which is connected to a focus adjusting device (11) and to an electrode terminal (32) of a holder (13). The electrode terminal (32) of the holder (13) faces the electrode terminal of the lens barrel (12) which electrode terminal changes in position in accordance with movement of the lens barrel (12) which movement is caused with the use of a lens barrel moving mechanism.Type: ApplicationFiled: October 10, 2013Publication date: September 17, 2015Inventors: Keisuke Ohta, Yoshihiro Sohtome
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Publication number: 20150256095Abstract: A voltage of a reactor is detected. a correction is made on the basis of the voltage of the reactor so that a first voltage control rate command which is a ratio of an amplitude of an AC voltage to an average value of a DC voltage increases as a harmonic component of the DC voltage becomes higher and the first voltage control rate command decreases as an amplitude of an alternating current outputted from the power converter becomes larger, to generate a second voltage control rate command. A switching signal which is generated on the basis of the second voltage control rate command is given to the power converter.Type: ApplicationFiled: September 2, 2013Publication date: September 10, 2015Applicant: DAIKIN INDUSTRIES, LTD.Inventor: Keisuke Ohta
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Publication number: 20140328091Abstract: A power converter includes a rectifier section, an inverter section, a capacitance element connected between inverter section input ends, an inductance element forming part of an LC filter with the capacitance element, a voltage detector detecting an inductance element voltage, and a controller controlling the inverter section based on the detected voltage. The LC filter has a resonance frequency set such that ripple current components contained in DC current outputted from the rectifier section passes through, and current components of a frequency equal to a carrier frequency of the inverter section are dampened. The controller controls the inverter section so that a transfer characteristic of input voltage of the inverter section versus the DC voltage from the rectifier section becomes a damping characteristic given by a phase lead element and a second-order lag element connected in series, and a damping coefficient of the transfer characteristic is set larger than 1.Type: ApplicationFiled: June 1, 2012Publication date: November 6, 2014Inventors: Kenichi Sakakibara, Keisuke Ohta
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Publication number: 20140212913Abstract: The present invention provides an embedding resin composition for electron microscopy having satisfactory performance as an embedding medium, including embedding performance and sectioning quality, and exhibiting excellent antistatic performance; and a method for observing a sample with an electron microscope using the composition. The embedding resin composition for electron microscopy of the present invention having antistatic performance comprises an ionic liquid and an embedding medium comprising an epoxy-based resin, a methacrylate resin or an unsaturated polyester resin. Preferably, the ionic liquid comprising a quaternary ammonium compound based on the formula (I): and an anion selected from the group consisting of BF4?, PF6?, (CF3SO2)2N?, a halide ion, a conjugate base of carboxylic acid, a conjugate base of sulfonic acid and a conjugate base of an inorganic acid.Type: ApplicationFiled: September 4, 2012Publication date: July 31, 2014Applicant: KURUME UNIVERSITYInventors: Keisuke Ohta, Toshiyuki Kiyu
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Patent number: 8697912Abstract: The present invention relates to an N-(1-hydroxyethyl)carboxamide compound represented by formula (1) (in the formula, RA and RB represent independently from each other a hydrogen atom or an alkyl group having 1 to 4 carbon atoms except for a case where RA and RB represent a hydrogen atom at the same time) and a method for producing the same; a method for producing an N-(1-alkoxyethyl)carboxamide compound; a method for producing an N-vinyl carboxylic acid amide compound; and a method for producing an N-vinyl carboxylic acid amide (co)polymer. An N-(1-alkoxyethyl)carboxamide compound can be obtained by reacting N-(1-hydroxyethyl)carboxamide compound with alcohol in the presence of an acid catalyst, and an N-vinyl carboxylic acid amide compound, which is a monomer of the N-vinyl carboxylic acid amide (co)polymer, can be obtained by thermally decomposing or catalytically decomposing the N-(1-alkoxyethyl)carboxamide compound.Type: GrantFiled: January 5, 2010Date of Patent: April 15, 2014Assignee: Showa Denko K.K.Inventors: Keisuke Ohta, Syunichi Nagamatsu, Tetsuya Ishii
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Publication number: 20140018507Abstract: A polyether compound containing oxirane monomer units in an average number per molecule of 5 to 200, wherein the polyether compound has a cationic group and cross-linkable group in the oxirane monomer units, and a cross-linkable composition containing this polyether compound and a cross-linking agent which enables cross-linking of the cross-linkable groups of the polyether compound are provided.Type: ApplicationFiled: March 30, 2012Publication date: January 16, 2014Applicant: ZEON CORPORATIONInventors: Shigetaka Hayano, Hiroyuki Yonemaru, Keisuke Ohta
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Publication number: 20110294974Abstract: The present invention relates to an N-(1-hydroxyethyl)carboxamide compound represented by formula (1) (in the formula, RA and RB represent independently from each other a hydrogen atom or an alkyl group having 1 to 4 carbon atoms except for a case where RA and RB represent a hydrogen atom at the same time) and a method for producing the same; a method for producing an N-(1-alkoxyethyl)carboxamide compound; a method for producing an N-vinyl carboxylic acid amide compound; and a method for producing an N-vinyl carboxylic acid amide (co)polymer. An N-(1-alkoxyethyl)carboxamide compound can be obtained by reacting N-(1-hydroxyethyl)carboxamide compound with alcohol in the presence of an acid catalyst, and an N-vinyl carboxylic acid amide compound, which is a monomer of the N-vinyl carboxylic acid amide (co)polymer, can be obtained by thermally decomposing or catalytically decomposing the N-(1-alkoxyethyl)carboxamide compound.Type: ApplicationFiled: January 5, 2010Publication date: December 1, 2011Applicant: SHOWA DENKO K.K.Inventors: Keisuke Ohta, Syunichi Nagamatsu, Tetsuya Ishii
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Patent number: 7978590Abstract: An optical pickup apparatus, a reproducing apparatus, a recording apparatus, and a tracking error signal generation method are provided. Four light-receiving elements receive stray light of main and sub beams reflected from, out of a plurality of recording layers of the optical disk, the one other than that for effecting recording or reproduction. The four light-receiving elements are disposed individually near every side of the four-part split light-receiving element, of which light-receiving elements are disposed between the two-part split light-receiving elements. Based on stray-light intensity detected by the four light-receiving elements, intensity distribution is calculated for tracking-error signal correction.Type: GrantFiled: February 6, 2009Date of Patent: July 12, 2011Assignee: Sharp Kabushiki KaishaInventor: Keisuke Ohta