Patents by Inventor Tadashi Matsunaga

Tadashi Matsunaga 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).

  • Patent number: 12012988
    Abstract: An abnormality detection device and a fixing structure which are suitable for detecting an abnormality of a fastener such as a bolt or a nut are disclosed. An abnormality detection device detects an abnormality of a fixing structure, which includes a conductor and which fix steel plates to each other, and a spacer which includes an insulator and which is disposed between the steel plates and the washer. The abnormality detection device includes a transmission antenna that radiates electromagnetic waves to the fixing structure, a reception antenna that receives electromagnetic waves reflected by the fixing structure, and an abnormality detector that changes a frequency of the electromagnetic waves radiated from the transmission antenna to acquire frequency characteristics of standing waves received by the reception antenna. The abnormality of the fixing structure is detected by comparing the frequency characteristics with frequency characteristics in a normal state.
    Type: Grant
    Filed: November 21, 2019
    Date of Patent: June 18, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masahito Nakamura, Tadashi Minotani, Eri Matsunaga
  • Patent number: 11984903
    Abstract: To provide a variable reference voltage source for which a measuring instrument is unnecessary for calibration on the outside. A variable reference voltage source that generates a variable reference voltage corresponding to setting data set from outside includes a control unit including a calibration control unit that controls operation for calibrating an offset and a predetermined unit voltage inside the variable reference voltage source and an output control unit that controls operation for outputting the variable reference voltage, a reference voltage unit that outputs a reference voltage Vref, and an integrated-voltage generating unit that repeats, when the calibration control unit controls the operation, an integrating operation until an integrated voltage obtained by integrating the predetermined unit voltage becomes equal to the reference voltage Vref and outputs, when the output control unit controls the operation, the variable reference voltage corresponding to the setting data.
    Type: Grant
    Filed: November 5, 2019
    Date of Patent: May 14, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tadashi Minotani, Kenichi Matsunaga
  • Patent number: 11976947
    Abstract: A transducer includes a conductive sheet installed on a sheath of a cable, an insulative sheet installed on the conductive sheet, holes being formed in predetermined positions of the insulative sheet, and a conductive sheet installed on the insulative sheet, holes being formed in predetermined positions of the conductive sheet. The transducer has structure in which, when the cable is tightened by the screw from the top of the conductive sheet and fixed, the distal end of the screw comes into contact with the conductive sheet passing through the holes formed in the insulative sheet and the conductive sheet, and the conductive sheet and the conductive sheet are electrically connected.
    Type: Grant
    Filed: July 26, 2019
    Date of Patent: May 7, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Eri Matsunaga, Masahito Nakamura, Tadashi Minotani, Masayuki Tsuda
  • Patent number: 11976993
    Abstract: A loosening detection structure used to detect loosening of a bolt includes a material that is disposed between a fixing subject steel plate and a head portion of a metal bolt for fixing the steel plate and either attached to a seating surface of the head portion of the bolt or attached to a washer disposed between the steel plate and the head portion of the bolt, and that has electrical characteristics that vary in response to variation in a force for fastening the bolt to the steel plate.
    Type: Grant
    Filed: November 8, 2019
    Date of Patent: May 7, 2024
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Eri Matsunaga, Tadashi Minotani, Masahito Nakamura, Masayuki Tsuda
  • Patent number: 11955985
    Abstract: An AD converter includes: an integration unit that uses an input voltage as an initial value and repeats an operation of integrating one or both of two types of unit voltages with the input voltage, thereby generating an integrated voltage; a switching threshold voltage unit that includes two types of threshold voltages causing the operation of integrating to be terminated; a comparator that compares the integrated voltage with the threshold voltages; an integration determination unit that, before the operation of integrating is started, causes the comparator to compare the input voltage with a rough adjustment threshold voltage corresponding to a larger one of the unit voltages; a unit voltage switching control unit that, when the rough adjustment threshold voltage is larger than the input voltage, controls the integration unit to generate the integrated voltage by using the two types of unit voltages; and a single unit voltage control unit that, when the rough adjustment threshold voltage is smaller than th
    Type: Grant
    Filed: December 10, 2019
    Date of Patent: April 9, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tadashi Minotani, Kenichi Matsunaga
  • Patent number: 11936396
    Abstract: An AD converter with self-calibration function that does not require an instrument for calibration, and includes: a reference voltage unit that generates a reference voltage; a summation and conversion unit that has two or more unit voltages serving as units of amount of change in a summed voltage, and during conversion, sums up any one unit voltage of the two or more unit voltages until the summed voltage exceeds the reference voltage, with an input voltage being an initial value of the summed voltage; and a control unit including a calibration control section that calibrates the two or more unit voltages and an offset voltage of a comparator at a time of calibration, and a conversion control section that determines a polarity of the offset voltage of the comparator and thereafter converts the input voltage to a digital value during conversion.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: March 19, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tadashi Minotani, Kenichi Matsunaga
  • Patent number: 11921055
    Abstract: Provided is a surface change detection body capable of detecting a change in the surface of an object only with passive components. The surface change detection body is disposed on a surface of an object to detect a change in the surface, and includes: a sensor unit that resonates with a high-frequency signal; a signal propagation unit that propagates the high-frequency signal to the sensor unit; and an incidence and reflection unit that receives the high-frequency signal from the outside and outputs a high-frequency signal reflected from the sensor unit to the outside, the sensor unit is a parallel plate resonator in which a dielectric is interposed, and the incidence and reflection unit is an antenna having a length which is an integral multiple of one fourth of an effective wavelength of a resonance frequency of the parallel plate resonator.
    Type: Grant
    Filed: November 21, 2019
    Date of Patent: March 5, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Masahito Nakamura, Eri Matsunaga, Tadashi Minotani
  • Patent number: 10538732
    Abstract: A cell isolation method includes: a cell trapping step of allowing a test liquid to pass through a cell trapping filter which has a plurality of through-holes in the thickness direction, thereby trapping isolation target cells contained in the test liquid on one surface of the cell trapping filter; a gel embedding step of introducing a stimulus-responsive hydrogel onto the one surface of the cell trapping filter on which the cells have been trapped in the cell trapping step, thereby embedding the cells in the stimulus-responsive hydrogel; a gel hardening step of applying a stimulus to the stimulus-responsive hydrogel in which the cells are embedded, thereby hardening the stimulus-responsive hydrogel; and a detachment step of detaching the stimulus-responsive hydrogel that was hardened in the gel hardening step from the cell trapping filter.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: January 21, 2020
    Assignee: National University Corporation Tokyo University of Agriculture and Technology
    Inventors: Tomoko Yoshino, Tsuyoshi Tanaka, Tadashi Matsunaga, Ryo Negishi, Hisashige Kanbara, Seita Nakamura
  • Publication number: 20170321183
    Abstract: A cell isolation method includes: a cell trapping step of allowing a test liquid to pass through a cell trapping filter which has a plurality of through-holes in the thickness direction, thereby trapping isolation target cells contained in the test liquid on one surface of the cell trapping filter; a gel embedding step of introducing a stimulus-responsive hydrogel onto the one surface of the cell trapping filter on which the cells have been trapped in the cell trapping step, thereby embedding the cells in the stimulus-responsive hydrogel; a gel hardening step of applying a stimulus to the stimulus-responsive hydrogel in which the cells are embedded, thereby hardening the stimulus-responsive hydrogel; and a detachment step of detaching the stimulus-responsive hydrogel that was hardened in the gel hardening step from the cell trapping filter.
    Type: Application
    Filed: October 29, 2015
    Publication date: November 9, 2017
    Applicants: National University Corporation Tokyo University of Agriculture and Technology, Hitachi Chemical Company, Ltd.
    Inventors: Tomoko Yoshino, Tsuyoshi Tanaka, Tadashi Matsunaga, Ryo Negishi, Hisashige Kanbara, Seita Nakamura
  • Publication number: 20160194600
    Abstract: An object of the present invention is to provide a method for performing fluid surface-floating culture of microalgae without supplying new seed algae. Microalgae on the bottom surface are used as seed algae. That is, there is provided a method for culturing microalgae which includes: a first culture process of culturing microalgae in a medium within a culture vessel, forming a biofilm on the liquid surface of the medium, and maintaining the microalgae on the bottom surface of the culture vessel; a process of collecting at least a part of the biofilm on the liquid surface formed in the first culture process and leaving at least some microalgae on the bottom surface inside the culture vessel; and a second culture process of culturing the microalgae remaining on the bottom surface within the identical culture vessel, and forming a biofilm on the liquid surface of the medium. In addition, the present invention provides novel microalgae which can form a biofilm on the liquid surface.
    Type: Application
    Filed: March 18, 2016
    Publication date: July 7, 2016
    Applicant: FUJIFILM Corporation
    Inventors: Hideyuki KANEHARA, Tadashi MATSUNAGA, Tsuyoshi TANAKA, Masayoshi TANAKA, Masaki MUTO
  • Publication number: 20160194671
    Abstract: In a liquid surface-floating culture method in which culturing of microalgae is performed on the liquid surface, there is provided a culture method in which the oil content in microalgae is improved. In addition, there is a provided a method for decreasing the probability of recovery of bottom surface algae. Furthermore, an object of the present invention is to provide a culture method in which the proliferation rate of microalgae is improved. Culturing is performed such that a medium is suctioned from a region, in which there is a small quantity of microalgae between the liquid surface and the bottom surface, is discarded, and is replaced with a medium of which the concentration of a nitrogen compound or a phosphorus compound is lower than that of the above-described medium. In addition, a liquid is added thereto immediately before collecting microalgae on the liquid surface, and the water depth in a culture vessel is made to be deep.
    Type: Application
    Filed: March 18, 2016
    Publication date: July 7, 2016
    Applicant: FUJIFILM Corporation
    Inventors: Hideyuki KANEHARA, Tadashi MATSUNAGA, Tsuyoshi TANAKA, Masayoshi TANAKA, Masaki MUTO
  • Publication number: 20150267162
    Abstract: There is provided a method of culturing microalgae, including: culturing in a first stage in which microalgae obtained through a purification process are cultured in a culture solution within a first culture container to form a biofilm as a film-like structure or a three-dimensional structure which is formed of the microalgae on a liquid surface of the culture solution; and culturing in a second stage in which microalgae are cultured on a liquid surface using at least a part of the biofilm as a film-like structure or a three-dimensional structure which is formed on the liquid surface of the culture solution, as seed algae.
    Type: Application
    Filed: June 8, 2015
    Publication date: September 24, 2015
    Applicant: FUJIFILM CORPORATION
    Inventors: Hideyuki KANEHARA, Tadashi MATSUNAGA, Tsuyoshi TANAKA, Masayoshi TANAKA
  • Publication number: 20150040467
    Abstract: There is provided a method for culturing microalgae in which microalgae capable of forming a biofilm on a liquid surface are cultured so as to form a biofilm on a liquid surface of a liquid medium, and microalgae capable of forming the biofilm on the liquid surface, for example, microalgae closely related to Botryococcus sudeticus.
    Type: Application
    Filed: October 23, 2014
    Publication date: February 12, 2015
    Applicant: FUJIFILM CORPORATION
    Inventors: Hideyuki KANEHARA, Tadashi MATSUNAGA, Tsuyoshi TANAKA, Masayoshi TANAKA
  • Publication number: 20150004687
    Abstract: A cell trapping device includes a housing that includes an inlet opening connected to an inlet line through which a cell dispersion liquid is introduced and an outlet opening connected to an outlet line through which the cell dispersion liquid is discharged; and a filter which is positioned within the housing and includes a trapping region for trapping cancer cells contained in the cell dispersion liquid. The filter is bonded to the housing, at least a part of the trapping region is formed of an observation region for observing the trapping region from the outside, the inlet line and the inlet opening are arranged at outer positions than the observation region when viewed from a normal line direction of the filter, and the inlet line is extended along an in-plane direction of the filter.
    Type: Application
    Filed: December 28, 2012
    Publication date: January 1, 2015
    Inventors: Yoshihito Kikuhara, Hisashige Kanbara, Takahiro Suzuki, Tadashi Matsunaga, Tomoko Yoshino, Masahito Hosokawa
  • Patent number: 8357530
    Abstract: The instant invention is directed to a microfluidic device which separates and captures with high efficiency a large amount of cells in a sample at one-cell level without damaging the cells by utilizing a microfabrication technology.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: January 22, 2013
    Assignee: National University Corporation Tokyo University of Agriculture and Technology
    Inventors: Tadashi Matsunaga, Atsushi Arakaki, Tomoyuki Taguchi, Masahito Hosokawa
  • Patent number: 8003562
    Abstract: A silica base composite photocatalyst that has appropriate water purification capability, inhibiting precipitation of metal oxides; and a process for producing the same. The silica base composite photocatalyst is one composed mainly of a composite oxide phase consisting of an oxide phase (first phase) composed mainly of silica component and a titania phase (second phase) wherein the ratio of presence of the second phase increases aslope toward the surface layer, characterized in that at least one metal oxide selected from among strontium titanate and barium titanate is contained in the second phase.
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: August 23, 2011
    Assignee: Ube Industries, Ltd.
    Inventors: Hiroyuki Yamaoka, Yoshikatsu Harada, Teruaki Fujii, Shinichirou Otani, Tadashi Matsunaga
  • Publication number: 20110060136
    Abstract: Dendrimer-coated magnetic fine particles comprise magnetic fine particles, a lipid bilayer covering a surface of individual magnetic fine particles, and a dendrimer bound to an outer layer of the lipid bilayer. With the dendrimer-coated magnetic fine particles, the dendrimer is positively charged are brought into contact with a nucleic acid-containing solution to adsorb the nucleic acid on the dendrimer, while the nucleic acid-adsorbed fine particles are collected by magnetic force to recover the nucleic acid from the solution.
    Type: Application
    Filed: September 9, 2010
    Publication date: March 10, 2011
    Applicants: TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY, YOKOGAWA ELECTRIC CORPORATION
    Inventors: Tadashi MATSUNAGA, Tsuyoshi TANAKA, Keiichi HATAKEYAMA, Takeo TANAAMI, Hitoshi WAKE, Tomoyuki TAGUCHI, Takeyuki MOGI
  • Publication number: 20110057145
    Abstract: There is provided a method for preparing dendrimer-modified magnetic fine particles wherein such particles can be made within a shorter time and more inexpensively than in the above-stated prior art processes and lot-to-lot variations in properties are lessened. The method for preparing dendrimer-fixed magnetic fine particles comprises the steps of providing magnetic particles having a functional group at a surface thereof, providing a dendrimer having a functional group at a base end portion thereof and synthesized to a desired generation and binding the functional group of the magnetic particles and the functional group of the dendrimer directly or indirectly through a crosslinking agent.
    Type: Application
    Filed: September 7, 2010
    Publication date: March 10, 2011
    Applicants: TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY, YOKOGAWA ELECTRIC CORPORATION
    Inventors: Tadashi Matsunaga, Tsuyoshi Tanaka, Keiichi Hatakeyama, Takeo Tanaami, Hitoshi Wake, Tomoyuki Taguchi, Takeyuki Mogi
  • Patent number: D692578
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: October 29, 2013
    Assignees: Hitachi Chemical Company, Ltd., National University Corporation Tokyo University of Agriculture and Technology
    Inventors: Yoshihito Kikuhara, Masafumi Kanetomo, Masahito Hosokawa, Tomoko Yoshino, Tadashi Matsunaga
  • Patent number: D700711
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 4, 2014
    Assignees: Hitachi Chemical Co., Ltd., National University Corporation Tokyo University of Agriculture and Technology
    Inventors: Yoshihito Kikuhara, Masafumi Kanetomo, Masahito Hosokawa, Tomoko Yoshino, Tadashi Matsunaga