Patents by Inventor Masanori Nakagawa

Masanori Nakagawa 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: 6556457
    Abstract: A method of controlling a parallel operation of two inverter power generation apparatuses wherein an unbalance of outputs from the two inverter power generation apparatuses is cancelled by judging that the outputs of the two inverter power generation apparatuses have the collapse of the balance between them when a DC power supply voltage obtained from a DC power supply section exceeds a judgment value set at a value equal to or more than a non-load output voltage of the DC power supply section and allowing an overload operation of the inverter power generation apparatus of higher output voltage among the two inverter power generation apparatuses so as to lower the output voltage of the corresponding inverter power generation apparatus.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: April 29, 2003
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Mitsuyoshi Shimazaki, Kaoru Shinba, Masanori Nakagawa
  • Publication number: 20030067793
    Abstract: An inverter generation apparatus comprising means to obtain a reference duty ratio of predetermined switch elements of an inverter on-off driven to each of switch timings so as to have a desired waveform of an AC voltage obtained across load connection terminals, means to obtain correction coefficient for the duty ratio relative to a value reflecting a variation in an output voltage of a DC power circuit, means to obtain a real duty ratio by multiplying the reference duty ratio by the correction coefficient whereby the switch elements of the inverter are on-off driven in the real duty ratio so that the desired value of the AC voltage across the load connection terminals.
    Type: Application
    Filed: October 4, 2001
    Publication date: April 10, 2003
    Applicant: Kokusan Denki Co., Ltd.
    Inventors: Mitsuyoshi Shimazaki, Masanori Nakagawa, Yutaka Inaba, Kaoru Shinba
  • Patent number: 6392311
    Abstract: A starter generator for an internal combustion engine serving as a starter motor when the internal combustion engine should start and as a generator after the internal combustion engine starts and comprising a magnet rotor and a stator having a plural of coils, a plural of switch circuits to switch a current flowing through the coils and a switch controller to control switch elements of the switch circuits whereby the current flows through all the coils by controlling the switch circuits in accordance with a position of the rotor when the engine should start to thereby produce a large torque and the current flows through one or some of the coils via a rectifying circuit of rectifying diodes provided in some switch circuits after the engine starts to thereby charge the battery.
    Type: Grant
    Filed: December 26, 2000
    Date of Patent: May 21, 2002
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Yutaka Inaba, Mitsuyoshi Shimazaki, Masanori Nakagawa, Shuichi Muramatsu
  • Patent number: 6373729
    Abstract: A method of controlling an electric power source apparatus including an electric power converter circuit which converts an output of an electric power source into DC or AC output and load connector terminals across which is applied an output of said converter circuit, which includes the steps of detecting a waveform of the load voltage across the load connection terminals after the output of the electric power converter circuit is stopped when an overcurrent flows through the load connection terminals, of judging a cause due to which the overcurrent flows, and of controlling said converter circuit according to the result of the judgement, wherein the electric power converter circuit is kept stopped when it is judged that the overcurrent is caused by an increase in the load and the electric power converter is so controlled that the waveform of the voltage applied across the load connection terminals from the electric power converter circuit is consistent with the waveform of the voltage detected by the voltage
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: April 16, 2002
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Mitsuyoshi Shimazaki, Masanori Nakagawa, Kaoru Shinba, Yutaka Inaba
  • Patent number: 6317339
    Abstract: A method of controlling an electric power supply apparatus with an electric converter circuit adapted to detect a phase difference between a waveform of a voltage across load connection terminals and a waveform of a reference voltage from time difference between zero cross points thereof and shift the phase of the reference voltage so that the phase difference is within a set range when it is decided that the phase difference is out of the set range whereby the phase of the output voltage across the load connection terminals is so controlled that it is coincident with that of an external voltage applied across the load connection terminals.
    Type: Grant
    Filed: October 4, 2000
    Date of Patent: November 13, 2001
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Mitsuyoshi Shimazaki, Masanori Nakagawa, Kaoru Shinba
  • Patent number: 6278622
    Abstract: A method of controlling an electric power source apparatus including an electric power converter circuit which converts an output of an electric power source into DC or AC output and load connector terminals across which is applied an output of said converter circuit, which includes the steps of detecting a waveform of the load voltage across the load connection terminals after the output of the electric power converter circuit is stopped when an overcurrent flows through the load connection terminals, of judging a cause due to which the overcurrent flows, and of controlling said converter circuit according to the result of the judgement, wherein the electric power converter circuit is kept stopped when it is judged that the overcurrent is caused by an increase in the load and the electric power converter is so controlled that the waveform of the voltage applied across the load connection terminals from the electric power converter circuit is consistent with the waveform of the voltage detected by the voltage
    Type: Grant
    Filed: June 26, 2000
    Date of Patent: August 21, 2001
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Mitsuyoshi Shimazaki, Masanori Nakagawa, Kaoru Shinba, Yutaka Inaba
  • Patent number: 6278194
    Abstract: A stator generator for an internal combustion engine comprising a magnet rotor provided on an output shaft of the engine and having main poles of permanent magnet and interpoles of material of high permeability alternately provided thereon whereby it is operated as an electric motor when the engine starts so that a drive current flows through armature coils with each of the main poles and one of the interpoles on the advanced side of the corresponding main pole serving as one rotor pole and it is operated as a magneto generator after the engine starts so that a control current flows through the armature coils so as to generate an output for charging a battery with each of the main poles and one of the interpoles on the delayed side of the corresponding main pole serving as one rotor pole.
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: August 21, 2001
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Masanori Nakagawa, Yutaka Inaba
  • Publication number: 20010006292
    Abstract: A starter generator for an internal combustion engine serving as a starter motor when the internal combustion engine should start and as a generator after the internal combustion engine starts and comprising a magnet rotor and a stator having a plural of coils, a plural of switch circuits to switch a current flowing through the coils and a switch controller to control switch elements of the switch circuits whereby the current flows through all the coils by controlling the switch circuits in accordance with a position of the rotor when the engine should start to thereby produce a large torque and the current flows through one or some of the coils via a rectifying circuit of rectifying diodes provided in some switch circuits after the engine starts to thereby charge the battery.
    Type: Application
    Filed: December 26, 2000
    Publication date: July 5, 2001
    Inventors: Yutaka Inaba, Mitsuyoshi Shimazaki, Masanori Nakagawa, Shuichi Muramatsu
  • Patent number: 6049194
    Abstract: A generating apparatus for feeding a current to a battery using a magneto as a power supply is disclosed which is capable of varying a magnetic field acting on generating coils to widely control characteristics of the magneto. A rectifying/switch circuit is arranged between the magneto and a load, which incorporates the battery. The rectifying/switch circuit includes diodes and switch elements. The diodes are 2n (n.gtoreq.2) in number and are bridge-connected to each other. The switch elements are connected to the diodes by reverse parallel connection. A switch control unit applies an AC control voltage of a predetermined phase from the battery through the rectifying/switch circuit to the generating coils, so that a phase of the AC control voltage may be varied to widely vary characteristics of the magneto.
    Type: Grant
    Filed: July 23, 1998
    Date of Patent: April 11, 2000
    Assignee: Kokusan Denki Co., Ltd.
    Inventors: Masanori Nakagawa, Yutaka Inaba
  • Patent number: 6013367
    Abstract: A cellulose multifilament yarn which is a lyocell multifilament yarn and has a breaking tenacity of 2.8-4.0 g/d and a breaking elongation of 13-20% both as dried and which gives a tenacity-elongation curve passing a tenacity range of 0.2-1.0 g/d at an elongation of 5% and a tenacity range of 0.4-2.5 g/d at an elongation of 10%.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: January 11, 2000
    Assignees: Asahi Kasei Kogyo Kabushiki Kaisha, Akzo Nobel Faser AG
    Inventors: Masanori Nakagawa, Akikazu Itani
  • Patent number: 5930989
    Abstract: A false twisted yarn is made from a lyocell multifilament yarn having a crimp shape coefficient defined by CE/N of 0.02-0.20, wherein CE is a crimp extension (%) and N is the number of crimps; a crimp extension of 0.7-7%; and a degree of swelling in water of 70% or less.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: August 3, 1999
    Assignees: Asahi Kasei Kogyo Kabushiki Kaisha, Akzo Nobel Faser AG
    Inventors: Masanori Nakagawa, Hiroshi Uto
  • Patent number: 5535496
    Abstract: A machine tool having a frame, a turret on the frame having a spindle for holding an operating tool, structure on at least one of the frame and turret for operating the spindle to effect machining of a workpiece by an operating tool held by the spindle, and first structure on at least one of the frame and turret for communicating fluid in a flow path from a pressurized supply to a workpiece to be machined by an operating tool held by the spindle to effect deburring/washing of the workpiece.
    Type: Grant
    Filed: February 25, 1994
    Date of Patent: July 16, 1996
    Assignee: Sugino Corporation
    Inventors: Shigeru Sugino, Masanori Nakagawa