Patents by Inventor Hirofumi Kawasaki

Hirofumi Kawasaki 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: 11572246
    Abstract: Provided is a document conveying apparatus that properly discharges documents regardless of the amount of documents stacked on a discharge tray without complicated construction of a transmission mechanism for transmitting a driving force to conveying rollers. A conveying roller pair is provided at an end portion on an upstream side. A swing mechanism swings a discharge mechanism centered around a drive shaft of the conveying roller pair. An upper surface height measuring unit measures the height of the upper surface of documents stacked on the discharge tray. A control unit, by causing the swing mechanism to swing the discharge mechanism according to the height measured by the upper surface height measuring unit, performs control so that the difference between a discharge port and the upper surface of the documents stacked on the discharge tray is within a specified range.
    Type: Grant
    Filed: October 21, 2020
    Date of Patent: February 7, 2023
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Yoshiaki Tashiro, Yoshitaka Tokoro, Kenichiro Kawasaki, Takafumi Nakagawa, Hirofumi Hagihara
  • Publication number: 20220297218
    Abstract: In this welding control method for a portable welding robot that moves along a guide rail, for using the portable welding robot to weld a workpiece including a groove: a groove shape detection position is established in at least one location in a welding sector extending from a welding starting point to a welding end point; the groove shape at a groove shape detection position Pn is sensed by means of a detecting means of the portable welding robot, which is moving along the guide rail; groove shape information is calculated from detection data obtained by the sensing; and a welding condition is acquired on the basis of the groove shape information.
    Type: Application
    Filed: March 17, 2020
    Publication date: September 22, 2022
    Applicants: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.), KOBELCO ROBOTiX Co., Ltd.
    Inventors: Takashi YASHIMA, Masaru KODAMA, Shinobu TODA, Hirofumi KAWASAKI
  • Patent number: 11390481
    Abstract: A document conveyance apparatus includes a first conveyance path, a first image reading part, a curved second conveyance path, a third conveyance path, a branch guide, a first discharge port, a document stacking section, a second discharge port and a tray support part. The first conveyance path extends linearly. The curved second conveyance path is branched from the first conveyance path at a branch point. The third conveyance path is branched from the first conveyance path at the branch point and extends linearly. Through the first discharge port, the document conveyed along the second conveyance path is discharged. The document stacking section is provided with a discharge tray. Through the second discharge port, the document conveyed along the third conveyance path is discharged. To the tray support part, the detached discharge tray is supported such that the document discharged through the second discharge port is stacked.
    Type: Grant
    Filed: September 28, 2020
    Date of Patent: July 19, 2022
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Kenichiro Kawasaki, Yoshiaki Tashiro, Yoshitaka Tokoro, Takafumi Nakagawa, Hirofumi Hagihara
  • Publication number: 20210375513
    Abstract: An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670° C. and not higher than 820° C. for a period of not less than 30 min and not more than 300 min.
    Type: Application
    Filed: August 11, 2021
    Publication date: December 2, 2021
    Inventors: Nobuhiro KATAYAMA, Hirofumi KAWASAKI, Koichiro MORIMOTO
  • Publication number: 20210366636
    Abstract: The present invention provides R-T-B-based rare earth magnet particles comprising no expensive rare resources such as Dy and having an excellent coercive force which can be produced by HDDR treatment without any additional steps. The present invention relates to R-T-B-based rare earth magnet particles comprising crystal grains comprising a magnetic phase of R2T14B, and a grain boundary phase, in which the grain boundary phase has a composition comprising R in an amount of not less than 13.5 atom % and not more than 35.0 atom % and Al in an amount of not less than 1.0 atom % and not more than 7.0 atom %. The R-T-B-based rare earth magnet particles can be obtained by controlling heat treatment conditions in the DR step of the HDDR treatment in the course of subjecting a raw material alloy to the HDDR treatment.
    Type: Application
    Filed: August 4, 2021
    Publication date: November 25, 2021
    Inventors: Nobuhiro KATAYAMA, Hirofumi KAWASAKI, Koichiro MORIMOTO
  • Patent number: 11120932
    Abstract: An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670° C. and not higher than 820° C. for a period of not less than 30 min and not more than 300 min.
    Type: Grant
    Filed: March 12, 2014
    Date of Patent: September 14, 2021
    Assignee: TODA KOGYO CORP.
    Inventors: Nobuhiro Katayama, Hirofumi Kawasaki, Koichiro Morimoto
  • Publication number: 20210016386
    Abstract: A welding device for gas shielded arc welding includes: a portable welding robot mounted with a welding torch including a nozzle that guides jetting of shielding gas and a contact tip that performs energization on a consumable electrode; a feeding device that supplies the consumable electrode to the welding torch; a welding power source that supplies electric power to the consumable electrode via the contact tip; a gas supply source that supplies the shielding gas to be jetted from a nozzle end; and a control device that controls the portable welding robot. When the welding torch is seen from a side of jetting of the shielding gas, the contact tip is placed in an inside of an opening of the nozzle, the nozzle and the contact tip have a relatively movable structure, and an inner diameter of the nozzle end is within a range of 10-20 mm.
    Type: Application
    Filed: March 13, 2019
    Publication date: January 21, 2021
    Applicants: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), KOBELCO ROBOTiX Co., Ltd.
    Inventors: Takashi YASHIMA, Masahiro YOKOTA, Shun IZUTANI, Hirofumi KAWASAKI, Shinobu TODA
  • Patent number: 8907755
    Abstract: R-T-B-based rare earth magnet particles are produced by an HDDR treatment which comprises a first stage HD step of heating particles of a raw material alloy having a composition of R, B and Co in an inert atmosphere or in a vacuum atmosphere and then replacing the atmosphere with a hydrogen-containing gas atmosphere in which the raw material alloy particles are held in the same temperature range and a second stage HD step of heating a material obtained in the first stage HD step in which the material is held in the hydrogen-containing gas atmosphere.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 9, 2014
    Assignee: Toda Kogyo Corporation
    Inventors: Nobuhiro Katayama, Hirofumi Kawasaki, Koichiro Morimoto
  • Publication number: 20140326363
    Abstract: The present invention provides R-T-B-based rare earth magnet particles comprising no expensive rare resources such as Dy and having an excellent coercive force which can be produced by HDDR treatment without any additional steps. The present invention relates to R-T-B-based rare earth magnet particles comprising crystal grains comprising a magnetic phase of R2T14B, and a grain boundary phase, in which the grain boundary phase has a composition comprising R in an amount of not less than 13.5 atom % and not more than 35.0 atom % and Al in an amount of not less than 1.0 atom % and not more than 7.0 atom %. The R-T-B-based rare earth magnet particles can be obtained by controlling heat treatment conditions in the DR step of the HDDR treatment in the course of subjecting a raw material alloy to the HDDR treatment.
    Type: Application
    Filed: August 30, 2012
    Publication date: November 6, 2014
    Applicant: TODA KOGYO CORP.
    Inventors: Nobuhiro Katayama, Hirofumi Kawasaki, Koichiro Morimoto
  • Publication number: 20140266525
    Abstract: An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670° C. and not higher than 820° C. for a period of not less than 30 min and not more than 300 min.
    Type: Application
    Filed: March 12, 2014
    Publication date: September 18, 2014
    Applicant: TODA KOGYO CORP.
    Inventors: Nobuhiro KATAYAMA, Hirofumi KAWASAKI, Koichiro MORIMOTO
  • Publication number: 20130265128
    Abstract: R-T-B-based rare earth magnet particles are produced by an HDDR treatment which comprises a first stage HD step of heating particles of a raw material alloy having a composition of R, B and Co in an inert atmosphere or in a vacuum atmosphere and then replacing the atmosphere with a hydrogen-containing gas atmosphere in which the raw material alloy particles are held in the same temperature range and a second stage HD step of heating a material obtained in the first stage HD step in which the material is held in the hydrogen-containing gas atmosphere.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 10, 2013
    Applicant: TODA KOGYO CORP.
    Inventors: Nobuhiro KATAYAMA, Hirofumi KAWASAKI, Koichiro MORIMOTO
  • Patent number: 7670676
    Abstract: There are provided a pharmaceutical raw material capable of exhibiting a uniform functionality and producing magnetic particle-containing drugs for diagnosis and medical treatments with a high reproducibility. The pharmaceutical raw material comprises a monodisperse colloid sterile aqueous solution of magnetic iron oxide fine particles having an average particle diameter of 5 to 30 nm, a saturation magnetization of 50 to 90 Am2/kg and a coercive force of 0.1 to 1.6 kA/m. The pharmaceutical raw material can be produced by forming magnetic iron oxide fine particles in the form of a colloid aqueous solution, purifying the resultant colloid aqueous solution of superparamagnetic iron oxide particles by water-washing and removing water-soluble salts by-produced upon the reaction from the reaction solution by an ordinary method, and replacing a dispersing medium of the purified colloid aqueous solution with ultrapure water.
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: March 2, 2010
    Assignee: Toda Kogyo Corporation
    Inventors: Nanao Horiishi, Toshiyuki Hakata, Hirofumi Kawasaki, Shinji Uemoto, Hiromitsu Misawa, Seiichi Takahashi
  • Publication number: 20060287404
    Abstract: There are provided a pharmaceutical raw material capable of exhibiting a uniform functionality and producing magnetic particle-containing drugs for diagnosis and medical treatments with a high reproducibility. The pharmaceutical raw material comprises a monodisperse colloid sterile aqueous solution of magnetic iron oxide fine particles having an average particle diameter of 5 to 30 nm, a saturation magnetization of 50 to 90 Am2/kg and a coercive force of 0.1 to 1.6 kA/m. The pharmaceutical raw material can be produced by forming magnetic iron oxide fine particles in the form of a colloid aqueous solution, purifying the resultant colloid aqueous solution of superparamagnetic iron oxide particles by water-washing and removing water-soluble salts by-produced upon the reaction from the reaction solution by an ordinary method, and replacing a dispersing medium of the purified colloid aqueous solution with ultrapure water.
    Type: Application
    Filed: June 13, 2006
    Publication date: December 21, 2006
    Applicant: TODA KOGYO CORPORATION
    Inventors: Nanao Horiishi, Toshiyuki Hakata, Hirofumi Kawasaki, Shinji Uemoto, Hiromitsu Misawa, Seiichi Takahashi
  • Publication number: 20060097232
    Abstract: The magneto rheological fluid of the present invention comprises magnetic particles, a dispersing medium and polyethyleneoxide as a viscosity modifier, the polyethyleneoxide being contained in an amount of 0.5 to 5% by weight based on the weight of the magnetic particles. The magneto rheological fluid of the present invention can exhibit an excellent dispersion stability, and, more specifically, can exhibit an excellent dispersion stability and can be prevented from suffering from sedimentation of magnetic particles contained therein.
    Type: Application
    Filed: April 18, 2005
    Publication date: May 11, 2006
    Applicant: TODA KOGYO CORPORATION
    Inventors: Toshiyuki Hakata, Hirofumi Kawasaki, Nanao Horiishi
  • Patent number: 5735969
    Abstract: The present invention is a method for making highly stable magnetic alloy particles with high coercivities and high saturation magnetization comprising the steps of:a) providing a precursor selected from the group consisting of iron oxide hydroxide particles and iron oxide particles, wherein the precursor particle comprises from about 15 to about 45 atomic % Co based on amount of Fe present,b) reducing the precursor particles to magnetic alloy particles,c) passivating the magnetic alloy particles in an oxygen-containing atmosphere at a temperature between about 20.degree. and 100.degree. C.,d) annealing the passivated magnetic alloy particles in an inert atmosphere at a temperature from about 120.degree. to about 450.degree. C., ande) further oxidizing the annealed magnetic alloy particles in an oxygen-containing atmosphere.
    Type: Grant
    Filed: March 7, 1996
    Date of Patent: April 7, 1998
    Assignees: Imation Corp., Toda Kogyo Corp.
    Inventors: Jean A. Lown, Yasutaka Ota, Kenji Okinaka, Hirofumi Kawasaki
  • Patent number: 5599378
    Abstract: Disclosed herein are spindle-shaped magnetic iron based alloy particles containing at least one selected from the group consisting of Ni, Al, Si, P, Co, Mg, B and Zn, which have a particle length of 0.05 to 0.40 .mu.m, a crystallite size of 110 to 180 .ANG., a specific surface area of 30 to 60 m.sup.2 /g, a coercive force of 1,300 to 1,700 Oe and a saturation magnetization (.sigma.s) of not less than 100 emu/g and a process for producing the same.
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: February 4, 1997
    Assignee: Toda Kogyo Corp.
    Inventors: Akio Mishima, Tosiharu Harada, Mamoru Tanihara, Yasutaka Ota, Kenji Okinaka, Kohji Mori, Hirofumi Kawasaki, Norimichi Nagai, Katsunori Fujimoto, Yoshiro Okuda
  • Patent number: 5531922
    Abstract: Disclosed herein are granulated particles for magnetic particles for magnetic recording, comprising: acicular ferric hydroxide oxide particles or acicular iron oxide particles; and at least one selected from the group consisting of semisynthetic starch and semisynthetic cellulose and having a bulk density of not less than 0.3 g/cm.sup.3 and a powdering ratio of not more than 40%, and a process for producing the granulated particles, and magnetic particles obtained from such granulated particles.
    Type: Grant
    Filed: September 12, 1995
    Date of Patent: July 2, 1996
    Assignee: Toda Kogyo Corporation
    Inventors: Kenji Okinaka, Yasutaka Ota, Kohji Mori, Hirofumi Kawasaki, Masayuki Uegami, Akio Mishima, Katsumi Yamashita, Minoru Yamasaki, Manabu Matsumoto, Kunihiro Kouchi, Hiroki Kamon
  • Patent number: 5466306
    Abstract: Disclosed herein are spindle-shaped magnetic iron based alloy particles containing at least one selected from the group consisting of Ni, Al, Si, P, Co, Mg, B and Zn, which have a particle length of 0.05 to 0.40 .mu.m, a crystallite size of 110 to 180 .ANG., a specific surface area of 30 to 60 m.sup.2 /g, a coercive force of 1,300 to 1,700 Oe and a saturation magnetization (.sigma.s) of not less than 100 emu/g and a process for producing the same.
    Type: Grant
    Filed: September 9, 1993
    Date of Patent: November 14, 1995
    Assignee: Toda Kogyo Corp.
    Inventors: Akio Mishima, Tosiharu Harada, Mamoru Tanihara, Yasutaka Ota, Kenji Okinaka, Kohji Mori, Hirofumi Kawasaki, Norimichi Nagai, Katsunori Fujimoto, Yoshiro Okuda
  • Patent number: 5238483
    Abstract: Disclosed herein are acicular magnetic iron based alloy particles for magnetic recording, containing 1.5 to 10 mol % of B based on Fe (calculated as B) and 1.5 to 10 mol % of Co based on Fe (calculated as Co) in the vicinity of the surfaces of said particles and having a saturation magnetization of not less than 125 emu/g and an S.F.D. value of not more than 0.50, and a process for producing the same.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: August 24, 1993
    Assignee: Toda Kogyo Corporation
    Inventors: Akio Mishima, Mamoru Tanihara, Yasutaka Ota, Hirofumi Kawasaki, Kenji Okinaka, Kunio Ikemoto, Kousaku Tamari, Kohji Mori, Norimichi Nagai
  • Patent number: 5156922
    Abstract: Disclosed herein are acicular magnetic iron based alloy particles for magnetic recording, containing 1.5 to 10 mol % of B based on Fe (calculated as B) and 1.5 to 10 mol % of Co based on Fe (calculated as Co) in the vicinity of the surfaces of said particles and having a saturation magnetization of not less than 125 emu/g and an S.F.D. value of not more than 0.50, and a process for producing the same.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: October 20, 1992
    Assignee: Toda Kogyo Corporation
    Inventors: Akio Mishima, Mamoru Tanihara, Yasutaka Ota, Hirofumi Kawasaki, Kenji Okinaka, Kunio Ikemoto, Kousaku Tamari, Kohji Mori, Norimichi Nagai