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).
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Patent number: 10500638Abstract: 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: GrantFiled: December 1, 2015Date of Patent: December 10, 2019Assignee: Kobe Steel, Ltd.Inventors: Yoshihiro Ito, Eiichiro Yoshikawa, Nobuaki Akagi, Yuji Taniguchi, Mitsuhiro Sato
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Patent number: 10240032Abstract: 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: GrantFiled: February 17, 2014Date of Patent: March 26, 2019Assignee: Kobe Steel, Ltd.Inventors: Yoshihiro Ito, Eiichiro Yoshikawa, Nobuaki Akagi, Mitsuhiro Sato
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Publication number: 20170304893Abstract: 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: ApplicationFiled: December 1, 2015Publication date: October 26, 2017Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoshihiro ITO, Eiichiro Yoshikawa, Nobuaki AKAGI, Yuji TANIGUCHI, Mitsuhiro SATO
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Publication number: 20170253948Abstract: 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: ApplicationFiled: February 17, 2017Publication date: September 7, 2017Applicant: TOHOKU UNIVERSITYInventors: Tetsuya NAGASAKA, Yoshihiro ITO, Katsuyuki IIJIMA, Eiichiro YOSHIKAWA, Toru TAKAI, Nobuo NAKAMURA
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Publication number: 20170197245Abstract: 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: ApplicationFiled: December 15, 2016Publication date: July 13, 2017Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoshihiro ITO, Eiichiro YOSHIKAWA, Yuji TANIGUCHI, Mitsuhiro SATO
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Publication number: 20150361255Abstract: 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: ApplicationFiled: February 17, 2014Publication date: December 17, 2015Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoshihiro ITO, Eiichiro YOSHIKAWA, Nobuaki AKAGI, Mitsuhiro SATO
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Patent number: 8614617Abstract: 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: GrantFiled: July 16, 2010Date of Patent: December 24, 2013Assignee: Kobe Steel, Ltd.Inventors: Hiroyuki Mitani, Kyoji Zaitsu, Kenichi Inoue, Osamu Ozaki, Hiroshi Hashimoto, Hirofumi Hojo, Koji Inoue, Eiichiro Yoshikawa, Naoya Fujiwara
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Patent number: 8431231Abstract: 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: GrantFiled: March 29, 2007Date of Patent: April 30, 2013Assignee: Kobe Steel, Ltd.Inventors: Takashi Yashiki, Kenji Yamamoto, Eiichiro Yoshikawa
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Publication number: 20120105190Abstract: 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: ApplicationFiled: July 16, 2010Publication date: May 3, 2012Applicant: 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
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Patent number: 7914898Abstract: 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: GrantFiled: December 6, 2004Date of Patent: March 29, 2011Assignees: Kabushiki Kaisha Kobe Seiko Sho, Sun Aluminium Industries, Ltd.Inventors: Eiichiro Yoshikawa, Naoya Fujiwara, Yasuhiro Okamura
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Publication number: 20100173171Abstract: 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: ApplicationFiled: March 29, 2007Publication date: July 8, 2010Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Takashi Yashiki, Kenji Yamamoto, Eiichiro Yoshikawa
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Patent number: 7587815Abstract: 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: GrantFiled: July 25, 2007Date of Patent: September 15, 2009Assignee: Kabushiki Kaisha Kobe Seiko ShoInventors: Eiichiro Yoshikawa, Akitoshi Fujisawa
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Publication number: 20080058230Abstract: 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: ApplicationFiled: July 25, 2007Publication date: March 6, 2008Inventors: Eiichiro Yoshikawa, Akitoshi Fujisawa
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Publication number: 20050284544Abstract: 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: ApplicationFiled: June 16, 2005Publication date: December 29, 2005Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Kenji Yamamoto, Eiichiro Yoshikawa, Takashi Yashiki
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Publication number: 20050145123Abstract: 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: ApplicationFiled: December 6, 2004Publication date: July 7, 2005Inventors: Eiichiro Yoshikawa, Naoya Fujiwara, Yasuhiro Okamura
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Patent number: 6824724Abstract: 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: GrantFiled: November 1, 2002Date of Patent: November 30, 2004Assignees: Teijin Limited, Kabushiki Kaisha Kobe Seiko ShoInventors: Hiroyuki Mori, Yozaburo Takayama, Kazuhisa Fujisawa, Hisashi Mitamura, Kazuto Okada, Naoya Fujiwara, Eiichiro Yoshikawa, Takayuki Kogishi
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Patent number: 6794022Abstract: 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: GrantFiled: April 6, 2001Date of Patent: September 21, 2004Assignees: Kabushiki Kaisha Kobe Seiko Sho, Sun Aluminum Industries Co., Ltd.Inventors: Naoya Fujiwara, Eiichiro Yoshikawa, Hiroshi Kawai, Mikio Ono, Yasuhiro Okamura
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Publication number: 20030122284Abstract: 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: ApplicationFiled: November 1, 2002Publication date: July 3, 2003Applicant: TEIJIN LIMITEDInventors: Hiroyuki Mori, Yozaburo Takayama, Kazuhisa Fujisawa, Hisashi Mitamura, Kazuto Okada, Naoya Fujiwara, Eiichiro Yoshikawa, Takayuki Kogishi
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Patent number: 6416599Abstract: 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: GrantFiled: June 28, 1999Date of Patent: July 9, 2002Assignees: Nippon Kayaku Kabushiki-Kaisha, Kabushiki Kaisha Kobe Seiko ShoInventors: Eiichiro Yoshikawa, Ryo Minoguchi, Akihiko Kuroiwa, Takeshi Kanda, Kenjiro Ikeda, Makoto Iwasaki, Akihiko Tanaka, Eishi Sato, Dairi Kubo, Kaoru Masuda, Moriyoshi Kanamaru
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Publication number: 20020037400Abstract: 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: ApplicationFiled: April 6, 2001Publication date: March 28, 2002Applicant: Kabushiki Kaisha Kobe Seiko ShoInventors: Naoya Fujiwara, Eiichiro Yoshikawa, Hiroshi Kawai, Mikio Ono, Yasuhiro Okamura