Patents by Inventor Takahiro Sekiguchi
Takahiro Sekiguchi 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: 8971427Abstract: According to one embodiment, a wireless transceiver system includes a transmitter and a receiver. The transmitter includes a first generator, a second generator, a third generator. The second generator generates fixed data item that has bit values corresponding to the clock signal. The third generator performs OFDM modulation for the fixed data item. The receiver includes a first detector, a second detector, a PLL, a controller. The first detector is configured to detect an envelope that indicates amplitude in a time waveform. The controller is configured to control to operate the PLL from a first time point when the head part is detected to a second time point when a first period is elapsed.Type: GrantFiled: July 19, 2012Date of Patent: March 3, 2015Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventors: Koji Akita, Takahiro Sekiguchi, Toshiyuki Nakanishi
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Patent number: 8947091Abstract: According to one embodiment, an MRI apparatus includes a probe unit and a control/imaging unit. The probe unit includes a probe, a converter, a compressor and a transmitter. The control/imaging unit includes a receiver, an expander and a reconstructor. The probe detects an RF echo signal generated in a subject by a magnetic resonance phenomenon. The converter digitizes the detected signal. The compressor compresses the digitized signal in accordance with a predetermined compression parameter to obtain a compressed signal. The transmitter generates a transmission signal to wirelessly transmit the compressed echo signal and sends the transmission signal to a radio channel. The receiver receives the transmission signal and extracts the compressed signal from the received signal. The expander expands the extracted compressed signal in accordance with the parameter to obtain the RF echo signal. The reconstructor generates a video signal regarding the subject on the basis of the obtained signal.Type: GrantFiled: October 29, 2010Date of Patent: February 3, 2015Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventors: Toshiyuki Nakanishi, Koji Akita, Takahiro Sekiguchi, Kazuya Okamoto, Sojuro Kato
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Patent number: 8906151Abstract: A calcium phosphate composition comprising tetracalcium phosphate particles (A), calcium hydrogen phosphate particles (B) and at least one kind of inorganic particles (C) selected from silica particles or titania particles, wherein the mixing ratio (A/B) of (A) to (B) is from 45/55 to 55/45 in molar ratio, the inorganic particles (C) have an average particle diameter of from 0.002 to 0.5 ?m, and the inorganic particles (C) are contained in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of (A) and (B) in total. Thereby provided is a calcium phosphate composition such that when it is used as a material for bone repair, a formed bone has high mechanical strength and a high bone replacement rate is achieved.Type: GrantFiled: January 15, 2007Date of Patent: December 9, 2014Assignee: Kuraray Noritake Dental Inc.Inventors: Tadashi Hashimoto, Takahiro Sekiguchi, Koichi Okada
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Patent number: 8704522Abstract: In one embodiment, an MRI apparatus includes first and second clock generators, a pulse generator, transmission and reception coils, pulse and phase detectors, and a corrector. The pulse generator generates an excitation pulse signal based on a clock signal generated by the first clock generator. The reception coil outputs a radio frequency signals corresponding to an excitation pulse transmitted from the transmission coil or an MR echo. The converter digitizes, synchronously with a clock signal generated by the second clock generator, the radio frequency signal, to obtain radio frequency data. The pulse detector detects excitation pulse data corresponding to the excitation pulse from the radio frequency data. The phase detector detects a phase of a pulse indicated by the detected excitation pulse data. The corrector corrects the radio frequency data based on the detected phase, to compensate for a phase offset which occurs in the echo during the digitization.Type: GrantFiled: March 15, 2011Date of Patent: April 22, 2014Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventors: Koji Akita, Takahiro Sekiguchi, Toshiyuki Nakanishi, Kazuya Okamoto, Sojuro Kato
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Patent number: 8643362Abstract: According to one embodiment, a apparatus includes a coil, a clock generator, an echo transmitter, a carrier generator, a clock transmitter, a regenerator, an receiver, a reconstructor, a detector, and a controller. The echo transmitter generates and transmits an echo transmission signal synchronously with a clock signal generated by the clock generator to wirelessly transmit an echo signal output from the col. The carrier generator generates a carrier signal have a frequency within a variable range. The clock transmitter wirelessly transmits a clock transmission signal. The regenerator regenerates the clock signal based on the transmitted clock transmission signal. The receiver extracts the echo signal synchronously with the regenerated clock signal from the transmitted echo transmission signal. The detector detects a frequency of an interference wave.Type: GrantFiled: March 15, 2011Date of Patent: February 4, 2014Assignee: Kabushiki Kaisha ToshibaInventors: Takahiro Sekiguchi, Koji Akita, Toshiyuki Nakanishi, Kazuya Okamoto, Sojuro Kato
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Patent number: 8502540Abstract: A magnetic resonance imaging apparatus includes a probe unit and a control/imaging unit. The probe unit includes a converter converting a sampled magnetic-resonance signal into a digital signal, a first transmitter converting the digital signal into a first-radio signal, a first receiver receiving and performing detection on the second-radio signal to obtain a first-received signal, and a clock-regeneration unit regenerating a clock component from the first-received signal to generate a regenerated-clock signals. The control/imaging unit includes a second-receiver receiving the first-radio signal to obtain a second-received signal, a data processor performing data processing on the second-received signal in synchronism with a reference-clock signal to obtain a video signal, and a second transmitter which modulates a carrier wave using the reference-clock signal, converts the reference-clock signal into the second-radio signal, and transmits the second-radio signal through the second-wireless channel.Type: GrantFiled: November 9, 2009Date of Patent: August 6, 2013Assignee: Kabushiki Kaisha ToshibaInventors: Toshiyuki Nakanishi, Koji Akita, Hideo Kasami, Takahiro Sekiguchi
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Publication number: 20120321006Abstract: According to one embodiment, a wireless transceiver system includes a transmitter and a receiver. The transmitter includes a first generator, a second generator, a third generator. The second generator generates fixed data item that has bit values corresponding to the clock signal. The third generator performs OFDM modulation for the fixed data item. The receiver includes a first detector, a second detector, a PLL, a controller. The first detector is configured to detect an envelope that indicates amplitude in a time waveform. The controller is configured to control to operate the PLL from a first time point when the head part is detected to a second time point when a first period is elapsed.Type: ApplicationFiled: July 19, 2012Publication date: December 20, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Koji AKITA, Takahiro SEKIGUCHI, Toshiyuki NAKANISHI
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Patent number: 8147807Abstract: A dental composition for oral use, containing a phosphorylated saccharide (a), a cationic bactericidal agent (b) and a solvent (c). By using the dental composition for oral use of the present invention, the adhesion of the bacteria in the oral cavity to the surfaces of the teeth can be suppressed for a long period of time; therefore, the dental composition for oral use can be suitably used for, for example, a mouse-wash agent, a dentifrice agent, a gargling agent, a mouse spray, a coating agent or a bonding agent to tooth surface or a dental prosthetic, a hypersensitive inhibitor, a therapeutic agent for periodontal diseases, that is applied to a periodontal pocket, or the like.Type: GrantFiled: July 18, 2007Date of Patent: April 3, 2012Assignees: National University Corporation Okayama University, Kuraray Medical Inc.Inventors: Yasuhiro Yoshida, Naoko Namba, Noriyuki Nagaoka, Kaori Yoshimoto, Shogo Takashiba, Kazuomi Suzuki, Hiroshige Ishino, Takahiro Sekiguchi, Koichi Okada
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Patent number: 8148571Abstract: A novel compound (I) represented by the following formula (1) is provided which is suitable for a dental composition and has a polymerizable group, a carboxyl group and a phosphoric acid group. A method for producing a polymerizable amide is provided, which method can make a condensation reaction of a carboxylic acid with an amine to proceed easily and is excellent in safety: wherein R1, R2 and R3 each independently are a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent; (A) and (B) are each any constituent unit; m is an integer of from 1 to 3; n is an integer of from 1 to 3; R4 is an organic group having 1 to 40 carbon atoms which may have a substituent; R5 is a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, R6 and R7 each independently are a hydrogen atom, a hydrocarbon group having 1 to 20 carbon atoms which may have a substituent, or a metal atom.Type: GrantFiled: September 27, 2007Date of Patent: April 3, 2012Assignee: Kuraray Medical Inc.Inventors: Takahiro Sekiguchi, Ai Hinamoto
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Patent number: 8124669Abstract: A composition for dental use containing a polymerizable monomer (a) having an aromatic ring and a hydroxyl group, a polymerizable monomer (b) having an aromatic ring without having any hydroxyl groups, and a polymerizable monomer (c) other than the polymerizable monomers (a) and (b), wherein the composition for dental use contains the polymerizable monomers (a), (b), and (c) in an amount of from 10 to 30% by weight, from 50 to 70% by weight, and from 10 to 30% by weight, respectively, of all the polymerizable monomers. The composition for dental use of the present invention can be suitably used as a product capable of substituting a part or all of a natural tooth in the field of dental therapy.Type: GrantFiled: February 5, 2008Date of Patent: February 28, 2012Assignee: Kuraray Medical Inc.Inventors: Eiichi Terakawa, Akiko Ota, Takahiro Sekiguchi
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Publication number: 20110227571Abstract: According to one embodiment, a apparatus includes a coil, a clock generator, an echo transmitter, a carrier generator, a clock transmitter, a regenerator, an receiver, a reconstructor, a detector, and a controller. The echo transmitter generates and transmits an echo transmission signal synchronously with a clock signal generated by the clock generator to wirelessly transmit an echo signal output from the col. The carrier generator generates a carrier signal have a frequency within a variable range. The clock transmitter wirelessly transmits a clock transmission signal. The regenerator regenerates the clock signal based on the transmitted clock transmission signal. The receiver extracts the echo signal synchronously with the regenerated clock signal from the transmitted echo transmission signal. The detector detects a frequency of an interference wave.Type: ApplicationFiled: March 15, 2011Publication date: September 22, 2011Inventors: Takahiro Sekiguchi, Koji Akita, Toshiyuki Nakanishi, Kazuya Okamoto, Sojuro Kato
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Publication number: 20110227574Abstract: In one embodiment, an MRI apparatus includes first and second clock generators, a pulse generator, transmission and reception coils, pulse and phase detectors, and a corrector. The pulse generator generates an excitation pulse signal based on a clock signal generated by the first clock generator. The reception coil outputs a radio frequency signals corresponding to an excitation pulse transmitted from the transmission coil or an MR echo. The converter digitizes, synchronously with a clock signal generated by the second clock generator, the radio frequency signal, to obtain radio frequency data. The pulse detector detects excitation pulse data corresponding to the excitation pulse from the radio frequency data. The phase detector detects a phase of a pulse indicated by the detected excitation pulse data. The corrector corrects the radio frequency data based on the detected phase, to compensate for a phase offset which occurs in the echo during the digitization.Type: ApplicationFiled: March 15, 2011Publication date: September 22, 2011Inventors: Koji Akita, Takahiro Sekiguchi, Toshiyuki Nakanishi, Kazuya Okamoto, Sojuro Kato
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Patent number: 7977405Abstract: The present invention provides a composition suitable for a dental composition. The present invention is a composition containing: a polymerizable monomer (A) having an unconjugated carbon chain with at least four carbon atoms bonded continuously, at least two polymerizable groups, and at least two hydroxyl groups; and a polymerizable monomer (B) having one polymerizable group and at least one hydroxyl group. When a suitable component is added to this composition, the resultant composition can be used suitably for dental materials such as a primer, bonding material, composite resin, and cement.Type: GrantFiled: January 16, 2008Date of Patent: July 12, 2011Assignee: Kurray Medical Inc.Inventors: Hiroshige Ishino, Takahiro Sekiguchi, Koichi Okada, Naoki Nishigaki
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Patent number: 7968615Abstract: The present invention provides a polymerizable composition that imparts excellent adhesive properties with respect to tooth structure (particularly dentin) when applied as a dental material, and provides a polymerizable monomer that is used as a component of the polymerizable composition. The present invention is a compound (A) that is a compound represented by the following formula (1): where G indicates a polymerizable group, m indicates an integer of 2 or more, n indicates an integer of 1 or more, and the sequence order of m units having a polymerizable group and n units having a hydroxyl group is arbitrary. The present invention also is a polymerizable composition containing the compound (A).Type: GrantFiled: March 6, 2008Date of Patent: June 28, 2011Assignee: Kuraray Medical Inc.Inventor: Takahiro Sekiguchi
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Patent number: 7951851Abstract: A curable composition for dental use, containing a polymerizable monomer, inorganic particles (A) having irregular shapes and an average particle size of from 1.0 to 5.0 ?m, wherein the inorganic particles (A) are surface-treated with a silane coupling agent (a) represented by the formula (I): wherein R1 is a hydrogen atom or a methyl group, R2 is a hydrolyzable group, R3 is a hydrocarbon group having 1 to 6 carbon atoms, X is an oxygen or sulfur atom, p is 2 or 3, and q is an integer of from 8 to 13, and inorganic particles (B) having irregular shapes and/or spherical or nearly spherical shapes, and an average particle size of from 0.01 to 0.Type: GrantFiled: January 24, 2008Date of Patent: May 31, 2011Assignee: Kuraray Medical Inc.Inventors: Yoshiko Kuboe, Takahiro Sekiguchi
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Publication number: 20110109316Abstract: According to one embodiment, an apparatus includes a control unit and a coil unit. The control unit generates a first clock signal, generates a data signal to indicate an operating condition, modulates the first clock signal by the data signal to obtain a modulated signal, generates a clock transmission signal including the modulated signal, and emits the clock transmission signal. The coil unit converts the clock transmission signal into an electric signal, detects the modulated signal from the clock transmission signal, generates a second clock signal synchronous with the first clock signal from the modulated signal, detects an MR signal generated in a subject, digitizes, synchronously with the second clock signal, the MR signal, detects the data signal from the detected modulated signal by using of the second clock signal, controls the operating condition of the coil unit to be the operating condition indicated by the data signal.Type: ApplicationFiled: November 4, 2010Publication date: May 12, 2011Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATIONInventors: Koji AKITA, Takahiro Sekiguchi, Kazuya Okamoto, Sojuro Kato
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Publication number: 20110101977Abstract: According to one embodiment, an MRI apparatus includes a probe unit and a control/imaging unit. The probe unit includes an probe, an converter, an compressor and a transmitter. The control/imaging unit includes a receiver, an expander and an reconstructor. The probe detects an RF echo signal generated in a subject by a magnetic resonance phenomenon. The converter digitizes the detected signal. The compressor compresses the digitized signal in accordance with a predetermined compression parameter to obtain a compressed signal. The transmitter generates a transmission signal to wirelessly transmit the compressed echo signal and sends the transmission signal to a radio channel. The receiver receives the transmission signal and extracts the compressed signal from the received signal. The expander expands the extracted compressed signal in accordance with the parameter to obtain the RF echo signal. The reconstructor generates a video signal regarding the subject on the basis of the obtained signal.Type: ApplicationFiled: October 29, 2010Publication date: May 5, 2011Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATIONInventors: Toshiyuki NAKANISHI, Koji Akita, Takahiro Sekiguchi, Kazuya Okamoto, Sojuro Kato
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Patent number: 7907084Abstract: This radar device includes: a transmitter to transmit a transmitting signal whose frequency is periodically increased/decreased at a predetermined rate of change; a mixer to generate a beat signal by multiplying a received signal being transmitted by the transmitter and reflected back from an object to be detected and the transmitting signal; a frequency detector to detect a frequency of the beat signal; and a controller to control the rate of change of the frequency of the transmitting signal so that the frequency of the beat signal detected by the frequency detector becomes equal to or larger than a cut-off frequency of a flicker noise caused by the mixer.Type: GrantFiled: March 16, 2009Date of Patent: March 15, 2011Assignee: Kabushiki Kaisha ToshibaInventors: Takahiro Sekiguchi, Ichiro Seto
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Publication number: 20110003267Abstract: A composition for dental use containing a polymerizable monomer (a) having an aromatic ring and a hydroxyl group, a polymerizable monomer (b) having an aromatic ring without having any hydroxyl groups, and a polymerizable monomer (c) other than the polymerizable monomers (a) and (b), wherein the composition for dental use contains the polymerizable monomers (a), (b), and (c) in an amount of from 10 to 30% by weight, from 50 to 70% by weight, and from 10 to 30% by weight, respectively, of all the polymerizable monomers. The composition for dental use of the present invention can be suitably used as a product capable of substituting a part or all of a natural tooth in the field of dental therapy.Type: ApplicationFiled: February 5, 2008Publication date: January 6, 2011Applicant: KURARAY MEDICAL INC.Inventors: Eiichi Terakawa, Akiko Ota, Takahiro Sekiguchi
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Publication number: 20100330005Abstract: A dental composition for oral use, containing a phosphorylated saccharide (a), a polyphosphoric acid and/or a salt thereof (b), and a cationic bactericidal agent (c), wherein a ratio of a total amount of the phosphorylated saccharide (a) and the polyphosphoric acid and/or a salt thereof (b) contained to an amount of the cationic bactericidal agent (c) contained, i.e. {(a)+(b)}/(c), is from 0.05 to 20 in a weight ratio.Type: ApplicationFiled: January 15, 2009Publication date: December 30, 2010Applicants: KURARAY MEDICAL INC., NATIONAL UNIVERSITY CORPORATION OKAYAMA UNIVERSITYInventors: Yasuhiro Yoshida, Naoko Namba, Noriyuki Nagaoka, Shogo Takashiba, Kazuomi Suzuki, Yamato Nojiri, Hiroshige Ishino, Takahiro Sekiguchi, Koichi Okada