Patents by Inventor Hirofumi Yamaguchi

Hirofumi Yamaguchi 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: 11409479
    Abstract: A image forming apparatus includes a power control unit, an operation mode control unit, and a first timer. The power control unit performs control so as to switch between a normal power state for supplying the operation power supply voltage to the image forming unit, a first power saving state for not supplying the operation power supply voltage to the image forming unit, and a second power saving state having less power consumption than the first power saving state. The operation mode control unit performs control so as to switch a normal mode corresponding to a normal power state, a first power saving mode corresponding to a first power saving state, and a second power saving mode corresponding to a second power saving state.
    Type: Grant
    Filed: October 22, 2021
    Date of Patent: August 9, 2022
    Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
    Inventor: Hirofumi Yamaguchi
  • Publication number: 20220227672
    Abstract: A ceramic body being configured of mainly BaTiO3-based crystalline particles in which a part of Ba is substituted with at least one rare earth element, wherein the ceramic body contains Ba6Ti17O40 crystalline particles of from 1.0 to 10.0% by mass.
    Type: Application
    Filed: December 9, 2021
    Publication date: July 21, 2022
    Applicant: NGK INSULATORS, LTD.
    Inventors: Toru HAYASE, Hirofumi YAMAGUCHI, Masaaki MASUDA, Yukio MIYAIRI
  • Publication number: 20220137893
    Abstract: A image forming apparatus includes a power control unit, an operation mode control unit, and a first timer. The power control unit performs control so as to switch between a normal power state for supplying the operation power supply voltage to the image forming unit, a first power saving state for not supplying the operation power supply voltage to the image forming unit, and a second power saving state having less power consumption than the first power saving state. The operation mode control unit performs control so as to switch a normal mode corresponding to a normal power state, a first power saving mode corresponding to a first power saving state, and a second power saving mode corresponding to a second power saving state.
    Type: Application
    Filed: October 22, 2021
    Publication date: May 5, 2022
    Inventor: Hirofumi YAMAGUCHI
  • Publication number: 20220135768
    Abstract: Provided is a technique for preparing an excellent viscous composition with a pH of about 4 to 5.5 by using a copolymer obtained by polymerizing a (meth)acrylic acid, a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms, and additionally, a compound with two or more ethylenically unsaturated groups. More specifically, provided is, for example, a viscous composition comprising (A) a copolymer obtained by polymerizing 100 parts by mass of a (meth)acrylic acid, 0.5 to 5 parts by mass of a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms, and 0.001 to 0.2 parts by mass of a compound with two or more ethylenically unsaturated groups, (B) a carboxylic acid metal salt, and (C) a carboxylic acid; and having a pH of 4 to 5.5, and a viscosity of 1000 to 50000 mPa·s.
    Type: Application
    Filed: February 27, 2020
    Publication date: May 5, 2022
    Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.
    Inventors: Hirofumi YAMAGUCHI, Chiaki UEZUMI
  • Publication number: 20220081365
    Abstract: A composite sintered body includes a base material that includes ceramic as a main component, and an electrode arranged inside the base material or on a surface of the base material. The electrode contains W and ZrO2.
    Type: Application
    Filed: August 20, 2021
    Publication date: March 17, 2022
    Applicant: NGK INSULATORS, LTD.
    Inventors: Kyohei ATSUJI, Keita MIYANISHI, Asumi NAGAI, Hirofumi YAMAGUCHI
  • Publication number: 20220084865
    Abstract: A composite sintered body includes a base material that contains Al2O3 as a main component, and an electrode arranged inside or on a surface of the base material. The electrode contains Ru, ZrO2, and Al2O3.
    Type: Application
    Filed: September 8, 2021
    Publication date: March 17, 2022
    Applicant: NGK INSULATORS, LTD.
    Inventors: Keita MIYANISHI, Kyohei ATSUJI, Asumi NAGAI, Hirofumi YAMAGUCHI, Soichiro AOYAGI
  • Publication number: 20220056256
    Abstract: Provided is a viscous composition that comprises a carboxyl-group-containing water-soluble copolymer, the composition having excellent viscosity even when an amino acid-based surfactant is contained in an amount greater than that of betaine. More specifically, provided is a viscous composition comprising (A) a copolymer obtained by polymerizing at least 100 parts by mass of a (meth)acrylic acid and 0.5 to 5 parts by mass of a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms, (B) an amino acid-based surfactant, (C) a betaine, (D) an alkyl glycoside, and (E) an organic acid salt, wherein the mass content of (B) is equal to or greater than the mass content of (C).
    Type: Application
    Filed: May 17, 2019
    Publication date: February 24, 2022
    Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.
    Inventors: Hirofumi YAMAGUCHI, Chiaki UEZUMI
  • Publication number: 20220054391
    Abstract: Provided is an aqueous dispersion composition that comprises a carboxyl-group-containing water-soluble copolymer in a relatively high concentration, but has intact handleability. More specifically, provided is, for example, an aqueous dispersion composition comprising 4 to 8 mass % of a copolymer obtained by polymerization in the presence of a nonionic surfactant with one or more polyoxyethylene chains, the copolymer being at least one member selected from the group consisting of (1) copolymers obtained by polymerizing the following (i) and (ii), (2) copolymers obtained by polymerizing the following (i) and (iii), and (3) copolymers obtained by polymerizing the following (i), (ii), and (iii): (i) 100 parts by mass of a (meth)acrylic acid; (ii) 0.001 to 1 part by mass of a compound with two or more ethylenically unsaturated groups; and (iii) 0.5 to 5 parts by mass of a (meth)acrylic acid alkyl ester having an alkyl group with 10 to 30 carbon atoms.
    Type: Application
    Filed: February 27, 2020
    Publication date: February 24, 2022
    Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.
    Inventors: Ryosuke MURAKAMI, Hirofumi YAMAGUCHI, Chiaki UEZUMI
  • Publication number: 20210380767
    Abstract: Provided are a gelled composition containing a thickening agent homogeneously dissolved in a polyhydric alcohol and a method for producing it. The gelled composition contains a polymer containing an ethylenically unsaturated carboxylic acid unit and an anhydrous polyhydric alcohol. The polymer is a partially neutralized product that has a degree of neutralization of 20 to 75%, and the polymer is dissolved in the alcohol. The method for producing the composition includes a first step of preparing a dispersion of a polymer containing an ethylenically unsaturated carboxylic acid unit in an anhydrous polyhydric alcohol, and a second step of mixing the dispersion with an anhydrous polyhydric alcohol to prepare a solution of the polymer in the alcohol. The polymer for use in the first step is a partially neutralized product that has a degree of neutralization of 20 to 75%, and is in the form of spherical particles.
    Type: Application
    Filed: October 24, 2019
    Publication date: December 9, 2021
    Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.
    Inventors: Makiko MIYAMOTO, Hirofumi YAMAGUCHI
  • Publication number: 20210305083
    Abstract: A stacked structure includes a first structure formed of a composite sintered body that contains AlN and MgAl2O4 as main phases, and a second structure formed of a ceramic sintered body and stacked on and bonded to the first structure. A difference in linear thermal expansion coefficient between the first structure and the second structure is less than or equal to 0.3 ppm/K.
    Type: Application
    Filed: March 15, 2021
    Publication date: September 30, 2021
    Applicant: NGK INSULATORS, LTD.
    Inventors: Asumi NAGAI, Noboru NISHIMURA, Hirofumi YAMAGUCHI
  • Publication number: 20210230074
    Abstract: According to the present invention, a dense composite material includes titanium silicide in an amount of 43 to 63 mass %; silicon carbide in an amount less than the mass percentage of the titanium silicide; and titanium carbide in an amount less than the mass percentage of the titanium silicide. In the dense composite material, a maximum value of interparticle distances of the silicon carbide is 40 ?m or less, a standard deviation of the interparticle distances is 10 or less, and an open porosity of the dense composite material is 1% or less.
    Type: Application
    Filed: January 20, 2021
    Publication date: July 29, 2021
    Applicant: NGK INSULATORS, LTD.
    Inventors: Asumi NAGAI, Noboru NISHIMURA, Hirofumi YAMAGUCHI
  • Publication number: 20200366123
    Abstract: Provided is a battery-charging device that uses a full-bridge rectifier circuit in which each arm is composed of MOSFET as a circuit that rectifies an output of a magnet-type AC generator. The charging device comprises: an ON/OFF state establishment means that, on the basis of a polarity of a potential of each input terminal of the rectifier circuit, establishes ON/OFF state to be assumed by each MOSFET of the rectifier circuit when a battery is charged; a during-charging FET control means that performs control which matches the state of each MOSFET of the rectifier circuit with the state established by the ON/OFF state establishment means when the battery is charged; a short-circuit control means that performs short-circuit control which causes short-circuiting between output terminals of the generator when battery charging is paused; and a FET OFF means that generates a FET OFF time period in which all of the MOSFETs of the rectifier circuit assume an OFF state in a fixed cycle.
    Type: Application
    Filed: November 29, 2017
    Publication date: November 19, 2020
    Inventors: HIROFUMI YAMAGUCHI, YUKI WAKAZUKI, RYUICHIRO TAKAHASHI, KAZUO MATSUDA
  • Publication number: 20200344850
    Abstract: A substrate processing apparatus includes: a chamber having a container including at least one substrate-heating region and at least one substrate-cooling region; a heating mechanism configured to heat a first substrate in the at least one substrate-heating region; a cooling mechanism configured to cool a second substrate in the at least one substrate-cooling region while the first substrate is being heated; and a partition provided in the container and configured to separate the at least one substrate-heating region and the at least one substrate-cooling region from each other in terms of heat and pressure.
    Type: Application
    Filed: April 23, 2020
    Publication date: October 29, 2020
    Inventors: Hirofumi YAMAGUCHI, Yoshiaki SASAKI, Yuichi NISHIMORI, Atsushi TANAKA
  • Patent number: 10579455
    Abstract: When a watchdog reset request is input, a power supply controller performs partial reset processing (resetting of a control circuit alone). When restarted by partial reset processing, the control circuit makes a non-volatile memory store a log of the stored contents of a volatile memory. After the log is stored, the control circuit transmits a system reset request to the power supply controller. Based on the system reset request, the power supply controller resets the control circuit, the non-volatile memory, the volatile memory, and reset targets.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: March 3, 2020
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hirofumi Yamaguchi
  • Publication number: 20190278652
    Abstract: When a watchdog reset request is input, a power supply controller performs partial reset processing (resetting of a control circuit alone). When restarted by partial reset processing, the control circuit makes a non-volatile memory store a log of the stored contents of a volatile memory. After the log is stored, the control circuit transmits a system reset request to the power supply controller. Based on the system reset request, the power supply controller resets the control circuit, the non-volatile memory, the volatile memory, and reset targets.
    Type: Application
    Filed: February 15, 2019
    Publication date: September 12, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Hirofumi YAMAGUCHI
  • Patent number: 10156024
    Abstract: Disclosed is a self-supporting zinc oxide substrate composed of a plate composed of a plurality of zinc-oxide-based single crystal grains, wherein the plate has a single crystal structure in an approximately normal direction, and the zinc-oxide-based single crystal grains have a cross-sectional average diameter of greater than 1 ?m. This substrate can be manufactured by a method comprising providing an oriented polycrystalline sintered body; forming a layer with a thickness of 20 ?m or greater composed of zinc-oxide-based crystals on the oriented polycrystalline sintered body so that the layer has crystal orientation mostly in conformity with crystal orientation of the oriented polycrystalline sintered body; and removing the oriented polycrystalline sintered body to obtain the self-supporting zinc oxide substrate.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: December 18, 2018
    Assignee: NGK Insulators, Ltd.
    Inventors: Morimichi Watanabe, Jun Yoshikawa, Hirofumi Yamaguchi, Tsutomu Nanataki
  • Patent number: 9940561
    Abstract: Providing is a control method of the image forming apparatus that can prevent, when interrupting a printing process and resuming a printing process by supplying a print sheet or switching to other apparatus, not intending to mix the paper having quality of paper is different in the bundle of the printed documents in advance. It is the control method of the image forming apparatus that interrupts a printing process for a first image forming apparatus and resumes a printing process with the second image forming apparatus. The interruption step of recording interruption information including the specification information of the print sheet at the time of a printing process being interrupted for a first image forming apparatus. It has the resumption step of resuming the printing process in the second image forming apparatus based on interruption information including the specification information of the print sheet.
    Type: Grant
    Filed: January 30, 2016
    Date of Patent: April 10, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hirofumi Yamaguchi
  • Patent number: 9824869
    Abstract: Provided is a zinc oxide-based sputtering target that enables production of a zinc oxide-based sputtered film having higher transparency and electrical conductivity. The zinc oxide-based sputtering target of the present invention is composed of a zinc oxide-based sintered body including zinc oxide crystal grains as a main phase and spinel phases as a dopant-containing grain boundary phase, and the zinc oxide-based sputtering target has a degree of (002) orientation of ZnO of 80% or greater at a sputtering surface, a density of the zinc oxide-based sintered body of 5.50 g/cm3 or greater, the number of the spinel phases per area of 20 counts/100 ?m2 or greater, and a spinel phase distribution index of 0.40 or less.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: November 21, 2017
    Assignee: NGK Insulators, Ltd.
    Inventors: Jun Yoshikawa, Hirofumi Yamaguchi, Tsutomu Nanataki
  • Patent number: 9767961
    Abstract: The present invention relates to a composite electronic component having a dielectric body portion inside of which a conductive body is provided, and a magnetic body portion inside of which a conductive body is provided. In the present invention, a layer made of a metal material is arranged between the dielectric body portion and the magnetic body portion as an intermediate layer.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: September 19, 2017
    Assignee: NGK Insulators, Ltd.
    Inventors: Naoto Ohira, Natsumi Shimogawa, Hirofumi Yamaguchi, Tsutomu Nanataki
  • Patent number: 9736328
    Abstract: An image forming apparatus has a normal mode and an energy-saving mode. The image forming apparatus includes a plurality of components, a power supply which stops supplying electric power to supply-stop parts in energy-saving mode, a monitor which makes the power supply restart supply of electric power to the supply-stop parts when a recovery factor to normal mode occurs (an interrupt signal occurs), an automatic recovery signal generator which inputs an automatic recovery signal, which is a kind of interrupt signal, to the monitor after completion of transition to energy-saving mode, and an arithmetic processor which, when an error occurs during the transition period, performs recovery preparation processing to have the automatic recovery signal input to the monitor after completion of transition to energy-saving mode.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: August 15, 2017
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Hirofumi Yamaguchi