Patents by Inventor Kazuma Matsui

Kazuma Matsui 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).

  • Publication number: 20190120792
    Abstract: The invention provides a technique for retaining hydrophilicity of a surface of a substrate over a long period of time with a simple maintenance without changing the structure and characteristics of the substrate. A component includes a hydrophilic component having a hydrophilic surface, a protective layer that is formed on the surface and contains a soluble sub stance.
    Type: Application
    Filed: September 5, 2018
    Publication date: April 25, 2019
    Inventors: Takahide YOKOI, Yusuke GOTO, Kazuma MATSUI
  • Publication number: 20190086362
    Abstract: A traditional nanopore DNA sequencing method has a problem in that a signal analysis error may occur when a signal variation reflecting fluctuation in a base current is contained in a signal variation in a signal analysis. An electrolyte solution for biomolecule assays, containing D2O as a solvent, and/or containing an electrolyte that has Cs and Na, Na alone, Na and Li, or Li alone as a cation species in the electrolyte solution, or trishydroxyaminomethane, or a combination thereof is used in formation of a nanopore or in measurement.
    Type: Application
    Filed: March 7, 2017
    Publication date: March 21, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Rena AKAHORI, Yusuke GOTO, Kazuma MATSUI, Takahide YOKOI
  • Publication number: 20180252696
    Abstract: A solution tank device comprises: an insulating thin film, which is configured to allow an object to be measured to pass therethrough, and has a thickness of 1 micrometer or less; a first solution tank, which is configured to support one surface of both surfaces of the insulating thin film; and a first conductive structure, which has a sheet resistance of 1013 ohms or less in a portion in which contact friction occurs between the first solution tank and an object outside of the first solution tank.
    Type: Application
    Filed: February 12, 2016
    Publication date: September 6, 2018
    Inventors: Kazuma MATSUI, Itaru YANAGI
  • Publication number: 20170299572
    Abstract: The thin film of a thin film device used for analyzing a biopolymer breaks due to the potential difference between the solutions at both sides of the thin film. The apparatus has a thin film, a first solution in contact with a first surface of the thin film, a second solution in contact with a second surface of the thin film, potential difference adjustment means for adjusting the potential difference between the first solution and the second solution to a small value, a control unit for controlling the potential difference adjustment means, a biopolymer inlet from which a biopolymer is introduced to at least one of the first solution and the second solution, a first electrode provided in the first solution, a second electrode provided in the second solution and an ammeter for measuring the current which flows between the first electrode and the second electrode when the biopolymer passes through a hole in the thin film between the first solution and the second solution.
    Type: Application
    Filed: November 12, 2014
    Publication date: October 19, 2017
    Applicant: HITACHI, LTD.
    Inventors: Kazuma MATSUI, Itaru YANAGI, Kenichi TAKEDA
  • Patent number: 5871043
    Abstract: An IGBT module has an IGBT element. Within a refrigerant tank is sealed refrigerant. On the bottom part of the refrigerant tank is provided the IGBT module. The heat emitted from the IGBT element is absorbed by the refrigerant by the transmission of the boiling heat emitted from the IGBT element and the refrigerant is gasified by the absorbed heat. A radiation tube is communicated with the refrigerant tank at one end and blocked at the other end. Within the radiation tube is disposed corrugated inner fins, and an upper space, refrigerant passages through for guiding the refrigerant from the refrigerant tank into the upper space, and thin holes in which a liquid pooling part for returning the refrigerant from the upper space into the refrigerant tank is formed are dividingly formed respectively.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: February 16, 1999
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hiroyuki Osakabe, Kiyoshi Kawaguchi, Masahiko Suzuki, Kazuma Matsui
  • Patent number: 5735015
    Abstract: A wiper assembly has an arm head which reciprocates with respect to a center line of a wiper arm by receiving motive force from a reciprocating rod. An elastic component is coaxially provided proximate to the center of rotation. When the coefficient of friction between the wiper blade and the windshield surface is inversely proportional to the speed of the wiper blade causing self-induced vibration in certain circumstances, the wiper blade tends to screech, skip or chatter across the windshield surface. Such vibration is suppressed by the elastic component, thereby permitting smooth reciprocal motion of the wiper assembly.
    Type: Grant
    Filed: January 28, 1997
    Date of Patent: April 7, 1998
    Assignee: Nippondenso Co., Ltd.
    Inventors: Shuntaro Yoshida, Toshiichi Sawada, Kazuma Matsui, Masahiko Suzuki, Masanori Sugiura
  • Patent number: 5542293
    Abstract: A pressure detecting apparatus for detecting vehicle tire air pressure. In a cylindrical housing mounted axially in parallel with a tire wheel, a setting magnet, a rotor magnet and a reversing magnet are coaxially provided and the rotor magnet is supported by a shaft rotatably and axially movably in response to a tire air pressure introduced to a bellows in the housing. When the air pressure is normal, the rotor magnet is attracted by the setting magnet. When the air pressure is reduced, the rotor magnet is separated by the movement of bellows, rotated by the repulsion force of the reversing magnet and finally attracted to said reversing magnet. By this operation, position of the magnetic poles of the rotor magnet is reversed and this reversion is detected electrically by a magnetism detecting unit.
    Type: Grant
    Filed: July 20, 1994
    Date of Patent: August 6, 1996
    Assignee: Nippondenso Co., Ltd.
    Inventors: Hiroshi Tsuda, Atsushi Iwase, Ken Nomura, Kazuma Matsui
  • Patent number: 5260683
    Abstract: A tire pressure detecting portion includes a housing, provided within the tire, within which a piezoelectric element is provided so as to be deformed by the tire pressure. The capacitance of said piezoelectric element is changed in accordance with its deformation. The piezoelectric element is electrically connected with a first coil diposed within said tire. The first coil is electromagnetically coupled with an excitation coil and a receiving coil, both of which are provided in the vehicle. The excitation coil provides an excitation voltage whole frequency is changed within a predetermined range including a resonant frequency. When the received voltage has the resonant frequency, a correspondinq tire pressure is determined based on a data map showing the relationship between said resonant frequency and the tire pressure.
    Type: Grant
    Filed: April 5, 1991
    Date of Patent: November 9, 1993
    Assignee: Nippondenso Co., Ltd.
    Inventors: Akio Tanaka, Masaru Suzuki, Hideki Miyazawa, Kazuma Matsui, Tetsuya Nagata, Yutaka Ohasi, Yoshihisa Nakano
  • Patent number: 5250265
    Abstract: A deodorizer which comprises a deodorant member, an electric motor, a fan fixed to the electric motor, a receptacle having these members accommodated therein, and a solar cell provided in the receptacle and adapted to supply a driving electric power to the electric motor, whereby, owing to the blowing action of the fan, air is caused to enter the interior the receptacle from an air suction port and pass therethrough and is blown out from an air blowout port to outside the receptacle, and the air is caused to flow around a portion of the receptacle where the solar cell is installed.
    Type: Grant
    Filed: May 4, 1992
    Date of Patent: October 5, 1993
    Assignee: Nippondenso Co., Ltd.
    Inventors: Kiyoshi Kawaguchi, Norihisa Itoh, Kouji Yamashita, Kazuma Matsui
  • Patent number: 5004406
    Abstract: A radial piston pump has a rotor provided within a cylinder chamber in such a manner that a center axis of the rotor is offset from a center axis of the cylinder chamber. The rotor has three working chambers a piston is slidably provided each of which. Each working chamber may connect with a suction groove or a discharge groove so that there exists a couple of situations, one of which is that two working chambers connect with the discharge chamber simultaneously and another one of which is that single working chamber connects with the discharge chamber. In order to make the forcing point at which total biassing force of the piston is focussed move gradually, the radial piston pump has a delay angle at a front side of the suction chamber. Namely a pressure within the working chamber is preliminary reduced before the working chamber connects to the suction groove so that the forcing point should shift gradually.
    Type: Grant
    Filed: March 22, 1989
    Date of Patent: April 2, 1991
    Assignee: Nippondenso Co., Ltd.
    Inventors: Masatoshi Kuroyanagi, Masahiko Suzuki, Kazuma Matsui, Makoto Imaeda, Kouzi Nagai, Yoshiaki Ito
  • Patent number: 5000521
    Abstract: A wheel cylinder and brake piston are formed in the brake caliper of each wheel of a vehicle. A piezoelectric device, which is formed of laminated piezoelectric elements, is formed in the brake caliper such that it is connected with the wheel cylinder. By applying a voltage to the piezoelectric elements the piston device is made to expand and contract to thereby vary the volume of the wheel cylinder. Brake fluid is supplied from the master cylinder to the wheel cylinder via fluid passage formed in the brake caliper and a control valve for opening and closing this passage is formed in the passage. When there is a high pressure in the wheel cylinder, the piezoelectric device expands and the control valve closes. Then, by lowering the voltage the piezoelectric device contracts and the pressure in the wheel cylinder decreases.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: March 19, 1991
    Assignees: Nippondenso Co., Ltd., Nippon Soken, Inc.
    Inventors: Yozo Majima, Taro Tanaka, Masahiko Suzuki, Kazuma Matsui, Mitsuo Inagaki, Kenji Takeda
  • Patent number: 4941353
    Abstract: A hermetic tubular casing hermetically containing a gas substantially at the atmospheric pressure is mounted on a mobile object, such as a vehicle, and is provided with a needle electrode at one end thereof and a pair of adjacent semicircular plate electrodes at the other end thereof. A high-voltage power supply applies a high voltage across the needle electrode and the plate electrodes to generate an ionic wind flowing from the needle electrode toward the plate electrodes by producing a corona discharge around the needle electrode. An arithmetic unit detects the difference between ionic currents flowing respectively through the pair of plate electrodes and each corresponding to the number of ions fallen on the corresponding plate electrode. The ionic wind is deflected under the action of a Coriolis force as the mobile object revolves entailing variation in the quantity of ions falling on each plate electrode.
    Type: Grant
    Filed: January 12, 1989
    Date of Patent: July 17, 1990
    Assignee: Nippondenso Co., Ltd.
    Inventors: Yoshiaki Fukatsu, Etsuji Nomura, Kazuma Matsui
  • Patent number: 4802562
    Abstract: The braking system comprising an input mechanism, such as a brake pedal or a brake lever, actuated by a vehicle operator during brake application. A sensor senses the pressure exerted on the brake pedal and delivers a first electrical signal in accordance with that pressure. The system also includes a source of brake fluid under a constant fluid pressure and pressure modulators in fluid communication with the source and the wheel cylinders. An electronic control unit responds to the first signal and delivers to the pressure modulators a second electrical signal proportional to the first signal to cause the pressure modulators to communicate to the wheel cylinders a fluid pressure proportional to the second signal to apply the brake with a braking force proportional to the applied pressure. The braking system also provides an anti-skid function, traction control function, and braking force proportioning function.
    Type: Grant
    Filed: March 13, 1987
    Date of Patent: February 7, 1989
    Assignee: Nippondenso Co., Ltd.
    Inventors: Masatoshi Kuroyanagi, Kazuma Matsui, Youzou Majima, Fumiaki Murakami
  • Patent number: 4800498
    Abstract: Disclosed is an anti-skid control system incorporated in the hydraulic pressure braking apparatus of a motor vehicle including a wheel braking cylinder responsive to a hydraulic pressure developed by a master cylinder for braking a wheel of the vehicle. The anti-skid control system comprises a hydraulic pressure supplying device and a directional control valve provided between the wheel braking cylinder and the hydraulic pressure supplying device. The directional control valve is actuated to shut off the communication therebetween and the actuation thereof is controlled in accordance with a duty cycle, which is in turn updated in accordance with the difference between a wheel speed and a target wheel speed so that the slip ratio of the wheel becomes equal to a target slip ratio.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: January 24, 1989
    Assignees: Nippondenso Co., Ltd., Toyota Jidosha Kabushiki Kaisha
    Inventors: Kazuma Matsui, Yoshiyuki Hattori, Yuuichi Imani, Akira Kuno, Yoshihisa Nomura
  • Patent number: 4747614
    Abstract: The hydraulic cylinder mechanism has a main piston which has a piston portion, two sub-pistons which is so located that the sub-pistons can hold the piston portion, control pressure chambers which are formed between the sub-piston and the piston portion, and holding pressure chambers which are formed at behind of the sub-piston. The hydraulic cylinder mechanism controls automotive rear wheel alignment when the main piston moves axially according to the pressure in the control pressure chambers and can maintain its neutral position when the pressure in the holding chamber is applied to the sub-piston so that holds the piston portion.
    Type: Grant
    Filed: March 12, 1987
    Date of Patent: May 31, 1988
    Assignee: Nippondenso Co., Ltd.
    Inventors: Masatoshi Kuroyanagi, Kazuma Matsui, Youzou Majima, Fumiaki Murakami
  • Patent number: 4738330
    Abstract: A hydraulic drive system for use with a vehicle power steering pump has a hydraulic motor connected in series with a power steering mechanism and a bypass line extending in bypassing relationship with the motor. A bypass valve is disposed in the bypass line to control the flow through the bypass line such that, when a steering force applied to a vehicle steering wheel is increased, the bypass flow is substantially in proportion to the steering force.
    Type: Grant
    Filed: March 20, 1986
    Date of Patent: April 19, 1988
    Assignee: Nippondenso Co., Ltd.
    Inventors: Masahiko Suzuki, Hiroshi Iwata, Kazuma Matsui, Akira Takagi, Yasuhiro Horiuchi, Kougorou Nakagawa, Toshiki Sugiyama
  • Patent number: 4738493
    Abstract: Antiskid hydraulic braking system comprising a first shutoff valve operable to shutoff hydraulic pressure from a master cylinder to wheel cylinder as the brakes tend to lock the wheels of a vehicle. Wheel cylinders are connected to a reservoir through a second shutoff valve which relieves hydraulic pressure at the wheel cylinders until the tendency toward wheel lock disappears. The system further comprises an intermittently operable high speed hydraulic pump, such as a piezoelectric pump, which serves to pump the brake fluid in the reservoir to the wheel cylinders to restore hydraulic pressure in the wheel cylinders. The piezoelectric pump comprises a pump plunger having a small diameter head defining a pumping chamber and a large diameter base defining a delivery or pressure chamber. The brake fluid under pressure in the delivery chamber acts upon the plunger base to hydraulically preload the piezoelectric elements.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: April 19, 1988
    Assignees: Nippon Soken, Inc., Nippondenso Co., Ltd.
    Inventors: Mitsuo Inagaki, Hideaki Sasaya, Kenji Takeda, Kazuma Matsui
  • Patent number: 4723888
    Abstract: A regenerative pump has a pump housing and a disc-like impeller mounted in the housing so as to be rotated by a motor. The impeller is provided with circumferential rows of radial vane grooves formed in the opposite end faces of the impeller adjacent to the outer periphery thereof. The rows of grooves are surrounded by a circumferential fluid passage which is formed between the impeller and the pump housing and communicated with suction and discharge ports formed in the pump housing and open to the circumferential fluid passage adjacent to the outer peripheral edges of respective end faces of the impeller. Each of the vane grooves has a bottom face which is arcuate as viewed in a radial section of the impeller. The suction port is substantially tangential to the bottom face of each vane groove in the adjacent end face of the impeller at the junction between the groove bottom face and the end face of the impeller.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: February 9, 1988
    Assignee: Nippondenso Co., Ltd.
    Inventors: Kiyohiko Watanabe, Kazuma Matsui, Yoshiyuki Hattori, Toshihiro Takei, Toshiaki Nakamura, Shunsaku Ohnishi
  • Patent number: 4715663
    Abstract: A brake oil pressure control device including a main line system for a normal braking operation, and a subline system for antiskid control and acceleration slip control. The main line system connects a master cylinder to a wheel cylinder, and has a first valve which opens the main line for a normal braking operation, and closes the main line when an antiskid control or acceleration slip control is in effect. The subline system has an oil pump connected to the wheel cylinder through a subline having a second valve, which is controlled to open and close the subline for the antiskid control or acceleration slip control. Inlet and outlet ports are connected by a relief pipe having a third valve and a relief valve. The relief valve opens the relief pipe under pressure from the master cylinder when a discharge pressure from the oil pump is higher than the pressure at the master cylinder, to restrain the discharge pressure from the oil pump.
    Type: Grant
    Filed: September 17, 1986
    Date of Patent: December 29, 1987
    Assignee: Nippondenso Co., Ltd.
    Inventors: Yoshiyuki Hattori, Kazuma Matsui, Yuichi Imani, Akira Kuno, Tetsuya Nagata, Koji Nakane, Ken Nomura
  • Patent number: 4697991
    Abstract: As a rotary pump, which is typically provided on an automobile, is provided with two alternative sources of motive power, typically including a driving connection to the automotive engine, and driving connection to an electric motor. These driving connections may be unidirectionally clutched in such a manner as to cause the electric motor to drive the rotary pump only when the pump is to be driven but the automotive engine is not operating up to a predetermined speed. Typically, the rotary pump is of the eccentrically mounted rotor type having radially outwardly protruding spring-loaded pistons effectively in contact with a camming ring. A slider is shown provided between the housing and the ring for effectively varying the magnitude of eccentricity of the rotor and thus for effectively smoothly varying the capacity of the pump.
    Type: Grant
    Filed: May 23, 1986
    Date of Patent: October 6, 1987
    Assignee: Nippondenso Co., Ltd.
    Inventors: Kengi Tsukahara, Kazuma Matsui, Taizoh Abe, Masahiko Suzuki