Patents by Inventor Satoshi Arakawa

Satoshi Arakawa 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: 11042182
    Abstract: A first PHY (121) transmits and receives signals, at a physical layer, to and from a second PHY (142) in a communication device (101) through a communication cable (601). The first PHY (121) is set as a clock master to transmit, to the second PHY (142), a clock signal defining timing for transmitting and receiving signals. A device controller (151), in response to detection of a set event, completes initialization of the first PHY (121) set as the clock master after completion of initialization of the second PHY (142) set as a clock slave.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: June 22, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Satoshi Arakawa
  • Publication number: 20210184920
    Abstract: A master-slave communication system (1) includes communication devices (100A to 100D) each operable as a master or a slave. Each of at least two (100A to 100C) of the communication devices that operates as slaves includes a down-state detection period storage (120) that stores a down-state detection period set shorter for a slave with a higher priority in selecting a new master among the slaves. A master presence determiner (140) determines whether a master is present based on whether the communication device receives, after receiving a signal from a master and before the down-state detection period elapses, a new signal from a communication device operating as a master. An operation switch (160) switches an operation of the communication device to an operation as a master when the master presence determiner (140) determines that a master is absent.
    Type: Application
    Filed: October 29, 2018
    Publication date: June 17, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoshi ARAKAWA, Hiroaki OMI
  • Publication number: 20210165443
    Abstract: A first PHY (121) transmits and receives signals, at a physical layer, to and from a second PHY (142) in a communication device (101) through a communication cable (601). The first PHY (121) is set as a clock master to transmit, to the second PHY (142), a clock signal defining timing for transmitting and receiving signals. A device controller (151), in response to detection of a set event, completes initialization of the first PHY (121) set as the clock master after completion of initialization of the second PHY (142) set as a clock slave.
    Type: Application
    Filed: September 19, 2018
    Publication date: June 3, 2021
    Applicant: Mitsubishi Electric Corporation
    Inventor: Satoshi ARAKAWA
  • Patent number: 10033517
    Abstract: A slave unit that is a communication apparatus according to the present invention includes: a frame relaying unit that receives, among communication frames received by a reception port, a communication frame to be relayed to the other apparatus and outputs the received communication frame to a transmission port; a frame transmitting unit that generates a communication frame and outputs the communication frame to the transmission port; and a transmission-frame arbitrating unit that regulates output of the communication frame to the transmission port performed by the frame transmitting unit in a guard time that is a period including a time period in which arrival of the communication frame transmitted in a network in a fixed cycle is expected.
    Type: Grant
    Filed: March 19, 2015
    Date of Patent: July 24, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventor: Satoshi Arakawa
  • Publication number: 20170373821
    Abstract: A slave unit that is a communication apparatus according to the present invention includes: a frame relaying unit that receives, among communication frames received by a reception port, a communication frame to be relayed to the other apparatus and outputs the received communication frame to a transmission port; a frame transmitting unit that generates a communication frame and outputs the communication frame to the transmission port; and a transmission-frame arbitrating unit that regulates output of the communication frame to the transmission port performed by the frame transmitting unit in a guard time that is a period including a time period in which arrival of the communication frame transmitted in a network in a fixed cycle is expected.
    Type: Application
    Filed: March 19, 2015
    Publication date: December 28, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventor: Satoshi ARAKAWA
  • Patent number: 9809454
    Abstract: The present invention is to provide a method for refining hydrogen with a hydrogen refining device in which the inside of a cell is divided into a primary side space and a secondary side space by palladium alloy capillaries each having one end being closed and a tube sheet supporting the open end of the palladium alloy capillaries, in which impurity-containing hydrogen is introduced from the primary side space to allow hydrogen to permeate the palladium alloy capillaries so as to collect pure hydrogen from the secondary side space. The method for refining hydrogen has a capability of decreasing the removed amount of gas containing impurities and efficiently collecting pure hydrogen from the secondary side space. From hydrogen with 1000 ppm or less of impurities as raw material hydrogen, gas containing impurities that does not penetrate the palladium alloy capillaries is removed from the primary side space at the flow rate of 10% or less of the introduction flow rate of the raw material hydrogen.
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: November 7, 2017
    Assignee: JAPAN PIONICS CO., LTD.
    Inventors: Yoshinao Komiya, Satoshi Arakawa, Toshio Akiyama, Yasuo Sato, Noboru Takemasa
  • Patent number: 9707507
    Abstract: The present invention provides ammonia purification means to remove impurities such as oil with a negative effect on vapor deposition from inexpensive commercially available industrial crude ammonia and from crude ammonia recovered from the gallium nitride compound semiconductor process and to continuously supply the purified ammonia to the gallium nitride compound semiconductor process. The oil removing device removing oil from crude ammonia containing oil as impurities includes an oil filter cylinder accommodating a filtration element cylindrically formed from a filtration membrane processed into a shape of pleat, honeycomb, or space structure; and an oil adsorption cylinder filled with activated carbon. The ammonia purification apparatus is provided with the oil removing device; a catalyst cylinder filled with a catalyst containing nickel as an active component; and an adsorption cylinder filled with synthetic zeolite.
    Type: Grant
    Filed: June 10, 2015
    Date of Patent: July 18, 2017
    Assignee: JAPAN PIONICS CO., LTD.
    Inventors: Satoshi Arakawa, Toshio Akiyama, Koichi Yada, Atsuya Makita
  • Publication number: 20160339377
    Abstract: The present invention provides ammonia purification means to remove impurities such as oil with a negative effect on vapor deposition from inexpensive commercially available industrial crude ammonia and from crude ammonia recovered from the gallium nitride compound semiconductor process and to continuously supply the purified ammonia to the gallium nitride compound semiconductor process. The oil removing device removing oil from crude ammonia containing oil as impurities includes an oil filter cylinder accommodating a filtration element cylindrically formed from a filtration membrane processed into a shape of pleat, honeycomb, or space structure; and an oil adsorption cylinder filled with activated carbon. The ammonia purification apparatus is provided with the oil removing device; a catalyst cylinder filled with a catalyst containing nickel as an active component; and an adsorption cylinder filled with synthetic zeolite.
    Type: Application
    Filed: June 10, 2015
    Publication date: November 24, 2016
    Inventors: Satoshi ARAKAWA, Toshio AKIYAMA, Koichi YADA, Atsuya MAKITA
  • Patent number: 9470180
    Abstract: A resin-made molded cylinder head cover, which is light in weight and relatively thin particularly at a flange part thereof comprises a cover part that is rectangular in shape and has a plurality of plug holes aligned in a longitudinally extending center area of the cover part; a flange part that is integral with and extends around a periphery of the cover part, so that the cylinder head cover is shaped like a rectangular shallow dish; and thicker elongate bead portions that are integral with the cover part and extend respectively along laterally opposed sides of the longitudinally extending center area, each bead portion being thicker than a general area of the cover part.
    Type: Grant
    Filed: February 24, 2014
    Date of Patent: October 18, 2016
    Assignee: MAHLE FILTER SYSTEMS JAPAN CORPORATION
    Inventors: Takanobu Saito, Masanori Suto, Satoshi Arakawa
  • Patent number: 9433889
    Abstract: The present invention is to provide a means for easily replacing palladium alloy capillaries in a hydrogen purification device formed by using hydrogen separation membrane formed from the palladium alloy capillaries. The hydrogen purification device can be easily disassembled into a palladium alloy membrane unit and a storage structure thereof. A palladium alloy membrane unit is provided with a plurality of palladium alloy capillaries, a disk-shaped tube sheet supporting the palladium alloy capillaries, a pure hydrogen discharge pipe having a cylinder being in close contact with a periphery of the tube sheet at one end, a joint connecting with a pure hydrogen outlet of the storage structure at the other end, and preferably a joint being in close contact with an opening of a container of the storage structure at a position between the cylinder and the outlet joint.
    Type: Grant
    Filed: December 23, 2014
    Date of Patent: September 6, 2016
    Assignee: JAPAN PIONICS CO., LTD.
    Inventors: Yoshinao Komiya, Satoshi Arakawa, Toshio Akiyama, Yasuo Sato, Noboru Takemasa
  • Patent number: 9438363
    Abstract: A communication device includes a transmission port and a reception port communicating with other network units, a system bus I/F unit communicating with a synchronous target, n (n is an integer of 2 or more) delay counters counting a predetermined period of time, a delay-counter control unit that, upon receiving a synchronous packet input with a predetermined cycle from the reception port, causes the delay counters to count a cycle that is n times as long as the predetermined cycle and controls the delay counters such that counts of the delay counters are cleared at different timings, and a synchronous-pulse output unit outputting a synchronous pulse to the synchronous target through the system bus I/F unit when there is the counter whose count value after being cleared becomes equal to a synchronous-pulse output value.
    Type: Grant
    Filed: August 1, 2012
    Date of Patent: September 6, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventor: Satoshi Arakawa
  • Publication number: 20160115022
    Abstract: The present invention is to provide a method for refining hydrogen with a hydrogen refining device in which the inside of a cell is divided into a primary side space and a secondary side space by palladium alloy capillaries each having one end being closed and a tube sheet supporting the open end of the palladium alloy capillaries, in which impurity-containing hydrogen is introduced from the primary side space to allow hydrogen to permeate the palladium alloy capillaries so as to collect pure hydrogen from the secondary side space. The method for refining hydrogen has a capability of decreasing the removed amount of gas containing impurities and efficiently collecting pure hydrogen from the secondary side space. From hydrogen with 1000 ppm or less of impurities as raw material hydrogen, gas containing impurities that does not penetrate the palladium alloy capillaries is removed from the primary side space at the flow rate of 10% or less of the introduction flow rate of the raw material hydrogen.
    Type: Application
    Filed: October 2, 2015
    Publication date: April 28, 2016
    Inventors: Yoshinao KOMIYA, Satoshi ARAKAWA, Toshio AKIYAMA, Yasuo SATO, Noboru TAKEMASA
  • Publication number: 20150196871
    Abstract: The present invention is to provide a means for easily replacing palladium alloy capillaries in a hydrogen purification device formed by using hydrogen separation membrane formed from the palladium alloy capillaries. The hydrogen purification device can be easily disassembled into a palladium alloy membrane unit and a storage structure thereof. A palladium alloy membrane unit is provided with a plurality of palladium alloy capillaries, a disk-shaped tube sheet supporting the palladium alloy capillaries, a pure hydrogen discharge pipe having a cylinder being in close contact with a periphery of the tube sheet at one end, a joint connecting with a pure hydrogen outlet of the storage structure at the other end, and preferably a joint being in close contact with an opening of a container of the storage structure at a position between the cylinder and the outlet joint.
    Type: Application
    Filed: December 23, 2014
    Publication date: July 16, 2015
    Inventors: Yoshinao KOMIYA, Satoshi ARAKAWA, Toshio AKIYAMA, Yasuo SATO, Noboru TAKEMASA
  • Publication number: 20150180598
    Abstract: A communication device includes a transmission port and a reception port communicating with other network units, a system bus I/F unit communicating with a synchronous target, n (n is an integer of 2 or more) delay counters counting a predetermined period of time, a delay-counter control unit that, upon receiving a synchronous packet input with a predetermined cycle from the reception port, causes the delay counters to count a cycle that is n times as long as the predetermined cycle and controls the delay counters such that counts of the delay counters are cleared at different timings, and a synchronous-pulse output unit outputting a synchronous pulse to the synchronous target through the system bus I/F unit when there is the counter whose count value after being cleared becomes equal to a synchronous-pulse output value.
    Type: Application
    Filed: August 1, 2012
    Publication date: June 25, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventor: Satoshi Arakawa
  • Publication number: 20150146757
    Abstract: A semiconductor laser module includes: a semiconductor laser outputting a laser light from an output-facet side of a waveguide which has a first narrow portion identical in width, a wide portion wider than the first narrow portion, a second narrow portion narrower than the wide portion, a first tapered portion between the first narrow portion and the wide portion and increasing in width toward the wide portion, and a second tapered portion between the wide portion and the second narrow portion and decreasing in width toward the second narrow portion; and an optical fiber to which the laser light is input has an optical-feedback unit reflecting a predetermined wavelength of light. The semiconductor laser is enclosed in a package with one end of the optical fiber. The optical-feedback unit has a first optical-feedback unit set at a predetermined reflection center wavelength determining an oscillation wavelength and a second optical-feedback unit.
    Type: Application
    Filed: February 5, 2015
    Publication date: May 28, 2015
    Inventors: Yutaka OHKI, Satoshi ARAKAWA, Shunsuke OKUYAMA, Masaki FUNABASHI, Junji YOSHIDA, Hidehiro TANIGUCHI
  • Publication number: 20140357067
    Abstract: A method of manufacturing a nitride substrate includes the following steps. Firstly, a nitride crystal is grown. Then, the nitride substrate including a front surface is cut from the nitride crystal. In the step of cutting, the nitride substrate is cut such that an off angle formed between an axis orthogonal to the front surface and an m-axis or an a-axis is greater than zero. When the nitride crystal is grown in a c-axis direction, in the step of cutting, the nitride substrate is cut from the nitride crystal along a flat plane which passes through a front surface and a rear surface of the nitride crystal and does not pass through a line segment connecting a center of a radius of curvature of the front surface with a center of a radius of curvature of the rear surface of the nitride crystal.
    Type: Application
    Filed: August 18, 2014
    Publication date: December 4, 2014
    Inventors: Satoshi ARAKAWA, Michimasa MIYANAGA, Takashi SAKURADA, Yoshiyuki YAMAMOTO, Hideaki NAKAHATA
  • Publication number: 20140314113
    Abstract: A semiconductor laser outputs a laser light from an output facet of a waveguide having an index waveguide structure, via a lens system. The waveguide includes, in order from a rear facet opposite to the output facet, a first narrow portion, a wide portion that is wider than the first narrow portion, a second narrow portion narrower than the wide portion, a first tapered portion formed between the first narrow portion and the wide portion, which expands toward the wide portion, and a second tapered portion formed between the wide portion and the second narrow portion, which narrows toward the second narrow portion. Each of the first narrow portion, the wide portion, and the second narrow portion has a uniform width.
    Type: Application
    Filed: July 2, 2014
    Publication date: October 23, 2014
    Inventors: Yutaka OHKI, Satoshi ARAKAWA, Shunsuke OKUYAMA, Masaki FUNABASHI, Junji YOSHIDA, Hidehiro TANIGUCHI
  • Patent number: 8829658
    Abstract: A method of manufacturing a nitride substrate includes the following steps. Firstly, a nitride crystal is grown. Then, the nitride substrate including a front surface is cut from the nitride crystal. In the step of cutting, the nitride substrate is cut such that an off angle formed between an axis orthogonal to the front surface and an m-axis or an a-axis is greater than zero. When the nitride crystal is grown in a c-axis direction, in the step of cutting, the nitride substrate is cut from the nitride crystal along a flat plane which passes through a front surface and a rear surface of the nitride crystal and does not pass through a line segment connecting a center of a radius of curvature of the front surface with a center of a radius of curvature of the rear surface of the nitride crystal.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: September 9, 2014
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Satoshi Arakawa, Michimasa Miyanaga, Takashi Sakurada, Yoshiyuki Yamamoto, Hideaki Nakahata
  • Publication number: 20140238331
    Abstract: A resin-made molded cylinder head cover, which is light in weight and relatively thin particularly at a flange part thereof comprises a cover part that is rectangular in shape and has a plurality of plug holes aligned in a longitudinally extending center area of the cover part; a flange part that is integral with and extends around a periphery of the cover part, so that the cylinder head cover is shaped like a rectangular shallow dish; and thicker elongate bead portions that are integral with the cover part and extend respectively along laterally opposed sides of the longitudinally extending center area, each bead portion being thicker than a general area of the cover part.
    Type: Application
    Filed: February 24, 2014
    Publication date: August 28, 2014
    Applicant: MAHLE FILTER SYSTEMS JAPAN CORPORATION
    Inventors: Takanobu SAITO, Masanori SUTO, Satoshi ARAKAWA
  • Patent number: 8811447
    Abstract: A semiconductor laser outputs a laser light from an output facet of a waveguide having an index waveguide structure, via a lens system. The waveguide includes, in order from a rear facet opposite to the output facet, a first narrow portion, a wide portion that is wider than the first narrow portion, a second narrow portion narrower than the wide portion, a first tapered portion formed between the first narrow portion and the wide portion, which expands toward the wide portion, and a second tapered portion formed between the wide portion and the second narrow portion, which narrows toward the second narrow portion. Each of the first narrow portion, the wide portion, and the second narrow potion has a uniform width.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: August 19, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Yutaka Ohki, Satoshi Arakawa, Shunsuke Okuyama, Masaki Funabashi