Patents by Inventor Eiichiro Yoshikawa

Eiichiro Yoshikawa 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: 10500638
    Abstract: One aspect of the present invention is a lubricant to be incorporated into a powder metallurgical mixed powder containing an iron-based powder. The lubricant includes a flaky organic material having an average particle diameter of from 0.1 ?m to less than 3 ?m. Another aspect of the present invention is a powder metallurgical mixed powder which contains an iron-based powder and the lubricant. Yet another aspect of the present invention is a method for producing a sintered compact. The method includes the step of mixing materials to give a powder metallurgical mixed powder containing an iron-based powder and the lubricant. The powder metallurgical mixed powder is compacted using a die to give a powder compact. The powder compact is sintered to give a sintered compact.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: December 10, 2019
    Assignee: Kobe Steel, Ltd.
    Inventors: Yoshihiro Ito, Eiichiro Yoshikawa, Nobuaki Akagi, Yuji Taniguchi, Mitsuhiro Sato
  • Patent number: 10240032
    Abstract: The present invention provides a binder which has excellent effect on suppression of segregation or dust emission, while exhibiting excellent fluidity both at ordinary temperatures and at high temperatures. The present invention is a binder which is blended for use in a mixed powder for powder metallurgy, said mixed powder containing an iron-based powder and an auxiliary starting material powder. This binder is characterized by being composed of one or more polymers that are selected from among butene polymers having a melting point of from 50° C. to 85° C. (inclusive) and a heated melt fluidity at 190° C. of from 2.0 g/10 minutes to 3.6 g/10 minutes (inclusive) and methacrylic acid polymers having a weight average molecular weight of 1,000,000 or less.
    Type: Grant
    Filed: February 17, 2014
    Date of Patent: March 26, 2019
    Assignee: Kobe Steel, Ltd.
    Inventors: Yoshihiro Ito, Eiichiro Yoshikawa, Nobuaki Akagi, Mitsuhiro Sato
  • Publication number: 20170304893
    Abstract: One aspect of the present invention is a lubricant to be incorporated into a powder metallurgical mixed powder containing an iron-based powder. The lubricant includes a flaky organic material having an average particle diameter of from 0.1 ?m to less than 3 ?m. Another aspect of the present invention is a powder metallurgical mixed powder which contains an iron-based powder and the lubricant. Yet another aspect of the present invention is a method for producing a sintered compact. The method includes the step of mixing materials to give a powder metallurgical mixed powder containing an iron-based powder and the lubricant. The powder metallurgical mixed powder is compacted using a die to give a powder compact. The powder compact is sintered to give a sintered compact.
    Type: Application
    Filed: December 1, 2015
    Publication date: October 26, 2017
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Yoshihiro ITO, Eiichiro Yoshikawa, Nobuaki AKAGI, Yuji TANIGUCHI, Mitsuhiro SATO
  • Publication number: 20170253948
    Abstract: A method for upgrading an ilmenite ore for yielding a high-TiO2-content titanium source by separating and removing an iron component from ilmenite (FeTiO3), which includes an oxidation step of oxidizing a starting ilmenite; after the oxidation step, a reduction step of reducing the treated ilmenite; and after the reduction step, an extraction step of dissolving the iron component with an acid, to thereby remove the iron component. Also disclosed is a production method for producing a high-TiO2-content titanium source, which includes upgrading an ilmenite ore as described above, and a high-TiO2-content titanium source produced through the production method.
    Type: Application
    Filed: February 17, 2017
    Publication date: September 7, 2017
    Applicant: TOHOKU UNIVERSITY
    Inventors: Tetsuya NAGASAKA, Yoshihiro ITO, Katsuyuki IIJIMA, Eiichiro YOSHIKAWA, Toru TAKAI, Nobuo NAKAMURA
  • Publication number: 20170197245
    Abstract: Provided is a mixed powder for powder metallurgy that has a low dust generating property and that forms therefrom a compact with high density and enables easy removal of the compact from a forming die. The mixed powder for powder metallurgy in the present invention is characterized by containing an iron-based powder, an auxiliary raw material, and a lubricant, the lubricant being a liquid lubricant that contains an organic metal component.
    Type: Application
    Filed: December 15, 2016
    Publication date: July 13, 2017
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Yoshihiro ITO, Eiichiro YOSHIKAWA, Yuji TANIGUCHI, Mitsuhiro SATO
  • Publication number: 20150361255
    Abstract: The present invention provides a binder which has excellent effect on suppression of segregation or dust emission, while exhibiting excellent fluidity both at ordinary temperatures and at high temperatures. The present invention is a binder which is blended for use in a mixed powder for powder metallurgy, said mixed powder containing an iron-based powder and an auxiliary starting material powder. This binder is characterized by being composed of one or more polymers that are selected from among butene polymers having a melting point of from 50° C. to 85° C. (inclusive) and a heated melt fluidity at 190° C. of from 2.0 g/10 minutes to 3.6 g/10 minutes (inclusive) and methacrylic acid polymers having a weight average molecular weight of 1,000,000 or less.
    Type: Application
    Filed: February 17, 2014
    Publication date: December 17, 2015
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Yoshihiro ITO, Eiichiro YOSHIKAWA, Nobuaki AKAGI, Mitsuhiro SATO
  • Patent number: 8614617
    Abstract: Provided is a reactor that enables high inductance to be generated with stability in a wide current range, while minimizing noise, processing cost, and eddy-current loss. The reactor (D1) has the ratio (t/W) of the width (W) to the thickness (t) of a conductive member that composes an air-core coil configured to be 1 or less, and preferably, 1/10 or less. Furthermore, the reactor also has the absolute value of a value ((L1?L2)/L3) that has had: the difference (L1?L2) between; the space interval (L1) between an inner wall face of a first core member (3) and an inner wall face of a second core member (4), at the innermost circumference position of the air-core coil (1); and the space (L2) between the inner wall face of the first core member (3) and the inner wall face of the second core member (4), at the outermost circumference position of the air-core coil (1); divided by an average value (L3); configured to be 1/50 or less.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: December 24, 2013
    Assignee: Kobe Steel, Ltd.
    Inventors: Hiroyuki Mitani, Kyoji Zaitsu, Kenichi Inoue, Osamu Ozaki, Hiroshi Hashimoto, Hirofumi Hojo, Koji Inoue, Eiichiro Yoshikawa, Naoya Fujiwara
  • Patent number: 8431231
    Abstract: The present invention provides a titanium material having high-temperature oxidation resistance at high temperatures above 800° C. and an exhaust pipe made of this titanium material for an engine. A titanium alloy contains 0.15 to 2% by mass Si, has an Al content below 0.30% by mass, and has equiaxial structure having a mean grain size of 15 ?m or above. The high-temperature oxidation resistance of the titanium alloy at high temperatures above 800° C., such as 850° C., is improved by means including adding Nb, Mo and Cr in combination with Si to the titanium alloy, forming equiaxial structure of coarse grains, creating acicular structure, Si-enrichment of a surface layer of the titanium alloy, and reducing impurities including copper, oxygen and carbon contained in the titanium alloy.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: April 30, 2013
    Assignee: Kobe Steel, Ltd.
    Inventors: Takashi Yashiki, Kenji Yamamoto, Eiichiro Yoshikawa
  • Publication number: 20120105190
    Abstract: Provided is a reactor that enables high inductance to be generated with stability in a wide current range, while minimizing noise, processing cost, and eddy-current loss. The reactor (D1) has the ratio (t/W) of the width (W) to the thickness (t) of a conductive member that composes an air-core coil configured to be 1 or less, and preferably, 1/10 or less. Furthermore, the reactor also has the absolute value of a value ((L1?L2)/L3) that has had: the difference (L1?L2) between; the space interval (L1) between an inner wall face of a first core member (3) and an inner wall face of a second core member (4), at the innermost circumference position of the air-core coil (1); and the space (L2) between the inner wall face of the first core member (3) and the inner wall face of the second core member (4), at the outermost circumference position of the air-core coil (1); divided by an average value (L3); configured to be 1/50 or less.
    Type: Application
    Filed: July 16, 2010
    Publication date: May 3, 2012
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Hiroyuki Mitani, Kyoji Zaitsu, Kenichi Inoue, Osamu Ozaki, Hiroshi Hashimoto, Hirofumi Hojo, Koji Inoue, Eiichiro Yoshikawa, Naoya Fujiwara
  • Patent number: 7914898
    Abstract: The present invention provides a resin-coated metal plate suitable as a cover plate for use in perforating a printed-wiring board with a drill, capable of effectively preventing the heat generation of drill bits and the scattering of chips while sufficiently performing lubrication and discharging the chips, to highly efficiently form a high-quality perforated-hole with excellent smoothness of the inner wall thereof while reducing the risk of breakage of the drill and eliminating any surface tackiness to achieve excellent operating performance and storage stability. The resin-coated metal plate of the present invention comprising a metal base plate, and a film made of a thermoplastic resin and formed on at least one of the opposite surfaces of said metal base plate to cover thereover, said thermoplastic resin being substantially water-insoluble, wherein said thermoplastic resin has: a melting peak temperature measured according to JIS K7121 ranging from 60° C. to 120° C.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: March 29, 2011
    Assignees: Kabushiki Kaisha Kobe Seiko Sho, Sun Aluminium Industries, Ltd.
    Inventors: Eiichiro Yoshikawa, Naoya Fujiwara, Yasuhiro Okamura
  • Publication number: 20100173171
    Abstract: The present invention provides a titanium material having high-temperature oxidation resistance at high temperatures above 800° C. and an exhaust pipe made of this titanium material for an engine. A titanium alloy contains 0.15 to 2% by mass Si, has an Al content below 0.30% by mass, and has equiaxial structure having a mean grain size of 15 ?m or above. The high-temperature oxidation resistance of the titanium alloy at high temperatures above 800° C., such as 850° C., is improved by means including adding Nb, Mo and Cr in combination with Si to the titanium alloy, forming equiaxial structure of coarse grains, creating acicular structure, Si-enrichment of a surface layer of the titanium alloy, and reducing impurities including copper, oxygen and carbon contained in the titanium alloy.
    Type: Application
    Filed: March 29, 2007
    Publication date: July 8, 2010
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Takashi Yashiki, Kenji Yamamoto, Eiichiro Yoshikawa
  • Patent number: 7587815
    Abstract: A resin-coated metal plate used as a protective plate in drilling a printed wiring board has a metal plate and a resin film including a thermoplastic resin coated on at least one surface of the metal plate. A melting peak temperature of the thermoplastic resin is in a range of 60-120° C., and in a TMA curve, a temperature difference exhibited by the thermoplastic resin is within a range of 5° C. to 30° C. in a period while penetration of the probe is changed from 10% to 100% of the resin thickness in a temperature range of 20° C. to 200° C.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: September 15, 2009
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Eiichiro Yoshikawa, Akitoshi Fujisawa
  • Publication number: 20080058230
    Abstract: A resin-coated metal plate used for drilling a printed wiring board is provided, by which a drilled hole excellent in smoothness of an inner wall can be provided at an accurate position with high quality and high efficiency under a high-density drilling condition in which drill entering speed is high, production volume is large, and a distance between adjacent drilled holes (pitch) is short, and breakability is reduced with respect to a drill; and a method of drilling the printed wiring board using the metal plate is provided. A resin-coated metal plate used as a protective back plate in drilling a printed wiring board has a metal plate, and a resin film including a thermoplastic resin coated on at least one surface of the metal plate; wherein in the thermoplastic resin, melting peak temperature is in a range of 60° C. to 120° C., and in a TMA curve, temperature difference is within a range of 5° C. to 30° C.
    Type: Application
    Filed: July 25, 2007
    Publication date: March 6, 2008
    Inventors: Eiichiro Yoshikawa, Akitoshi Fujisawa
  • Publication number: 20050284544
    Abstract: Disclosed are a surface-treated titanium material that is excellent in oxidation resistance and allows the excellent oxidation resistance to last for a long period of time and the surface treatment itself to be applied safely at a low cost; the production method thereof; and an exhaust system thereof. A surface-treated titanium material produced by forming an oxidation-resistant baked film 5 ?m or more in thickness on a substrate comprising commercially pure titanium or titanium-base alloy, and said baked film is formed by filling the gaps among particles comprising Al alloy containing Si by 10 at % or less or commercially pure aluminum with chemical compounds comprising a metallic element M (M represents one or more of Ti, Zr, Cr, Si and Al) and C and/or O.
    Type: Application
    Filed: June 16, 2005
    Publication date: December 29, 2005
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Kenji Yamamoto, Eiichiro Yoshikawa, Takashi Yashiki
  • Publication number: 20050145123
    Abstract: The present invention provides a resin-coated metal plate suitable as a cover plate for use in perforating a printed-wiring board with a drill, capable of effectively preventing the heat generation of drill bits and the scattering of chips while sufficiently performing lubrication and discharging the chips, to highly efficiently form a high-quality perforated-hole with excellent smoothness of the inner wall thereof while reducing the risk of breakage of the drill and eliminating any surface tackiness to achieve excellent operating performance and storage stability. The resin-coated metal plate of the present invention comprising a metal base plate, and a film made of a thermoplastic resin and formed on at least one of the opposite surfaces of said metal base plate to cover thereover, said thermoplastic resin being substantially water-insoluble, wherein said thermoplastic resin has: a melting peak temperature measured according to JIS K7121 ranging from 60° C. to 120° C.
    Type: Application
    Filed: December 6, 2004
    Publication date: July 7, 2005
    Inventors: Eiichiro Yoshikawa, Naoya Fujiwara, Yasuhiro Okamura
  • Patent number: 6824724
    Abstract: An object of the present invention is to provide a bladder which is unlikely to have a shapal variation along the inner wall surface of the tire and can satisfactorily extend along the inner wall surface of the tire. An inventive bladder is used to press the inner wall surface of the tire by a pressurized heating medium during the vulcanization of a green tire and is comprised of a fabric layer (purl stitched fabric layer 12) and rubber layers (silicone rubber layers 11, 13) placed one over another. Elongation rates of the fabric layer in warp direction and in weft direction both exceed 15% and satisfy: 0.4≦elongation rate in weft direction/elongation rate in warp direction ≦6.0. Since the fabric layer has good extensibility, it can elongate with the rubber layers.
    Type: Grant
    Filed: November 1, 2002
    Date of Patent: November 30, 2004
    Assignees: Teijin Limited, Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Hiroyuki Mori, Yozaburo Takayama, Kazuhisa Fujisawa, Hisashi Mitamura, Kazuto Okada, Naoya Fujiwara, Eiichiro Yoshikawa, Takayuki Kogishi
  • Patent number: 6794022
    Abstract: A metal plate coated with a lubricating resin is coated with a lubricating resin having a modified polyamide ({circle around (1)}) and a crosslinking curing agent ({circle around (2)}) of the modified polyamide ({circle around (1)}) on at least one side face of the metal plate. At this time, the compounding ratio of the modified polyamide ({circle around (1)}) and the above-described crosslinking curing agent ({circle around (2)}) is preferably (60:40) to (15:85) by mass ratio converted to solid content. Furthermore, according to requirement, an inorganic powder filler ({circle around (3)}) may be added to the resin composition.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: September 21, 2004
    Assignees: Kabushiki Kaisha Kobe Seiko Sho, Sun Aluminum Industries Co., Ltd.
    Inventors: Naoya Fujiwara, Eiichiro Yoshikawa, Hiroshi Kawai, Mikio Ono, Yasuhiro Okamura
  • Publication number: 20030122284
    Abstract: An object of the present invention is to provide a bladder which is unlikely to have a shapal variation along the inner wall surface of the tire and can satisfactorily extend along the inner wall surface of the tire. An inventive bladder is used to press the inner wall surface of the tire by a pressurized heating medium during the vulcanization of a green tire and is comprised of a fabric layer (purl stitched fabric layer 12) and rubber layers (silicone rubber layers 11, 13) placed one over another. Elongation rates of the fabric layer in warp direction and in weft direction both exceed 15% and satisfy: 0.4≦elongation rate in weft direction/elongation rate in warp direction≦6.0. Since the fabric layer has good extensibility, it can elongate with the rubber layers.
    Type: Application
    Filed: November 1, 2002
    Publication date: July 3, 2003
    Applicant: TEIJIN LIMITED
    Inventors: Hiroyuki Mori, Yozaburo Takayama, Kazuhisa Fujisawa, Hisashi Mitamura, Kazuto Okada, Naoya Fujiwara, Eiichiro Yoshikawa, Takayuki Kogishi
  • Patent number: 6416599
    Abstract: The present invention provides a gas generating agent for an air bag including a fuel component of nitrogenous organic compound and an oxidizing agent as its major components, to which at least one metal nitride or metal carbide that is allowed to react with a metallic component contained in the fuel component or the oxidizing agent to form slag is added, thus providing the effects of: solving the slag collecting problem which stands in the way of commercially practicing the nitrogenous organic compound base fuels; promoting the size reduction of the gas generator through the full use of high rate of gasification of the nitrogenous organic compound base fuels; and providing a gas generating agent molded member which is strong and stable with age by improving heat resistant properties and formability of the nitrogenous organic compound base fuels which are poor compared with the metallic compound azide of an inorganic matter.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: July 9, 2002
    Assignees: Nippon Kayaku Kabushiki-Kaisha, Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Eiichiro Yoshikawa, Ryo Minoguchi, Akihiko Kuroiwa, Takeshi Kanda, Kenjiro Ikeda, Makoto Iwasaki, Akihiko Tanaka, Eishi Sato, Dairi Kubo, Kaoru Masuda, Moriyoshi Kanamaru
  • Publication number: 20020037400
    Abstract: A metal plate coated with a lubricating resin is coated with a lubricating resin having a modified polyamide ({circle over (1)}) and a crosslinking curing agent ({circle over (2)}) of the modified polyamide ({circle over (1)}) on at least one side face of the metal plate. At this time, the compounding ratio of the modified polyamide ({circle over (1)}) and the above-described crosslinking curing agent ({circle over (2)}) is preferably (60:40) to (15:85) by mass ratio converted to solid content. Furthermore, according to requirement, an inorganic powder filler ({circle over (3)}) may be added to the resin composition.
    Type: Application
    Filed: April 6, 2001
    Publication date: March 28, 2002
    Applicant: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Naoya Fujiwara, Eiichiro Yoshikawa, Hiroshi Kawai, Mikio Ono, Yasuhiro Okamura