Patents by Inventor Shigeo Asai
Shigeo Asai 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: 9384888Abstract: Upon producing a transparent polycrystalline material, a suspension liquid (or slurry 1) is prepared, the suspension liquid being made by dispersing a raw-material powder in a solution, the raw-material powder including optically anisotropic single-crystalline particles to which a rare-earth element is added. A formed body is obtained from the suspension liquid by means of carrying out slip casting in a space with a magnetic field applied. On this occasion, while doing a temperature control so that the single-crystalline particles demonstrate predetermined magnetic anisotropy, one of static magnetic fields and rotary magnetic fields is selected in compliance with a direction of an axis of easy magnetization in the single-crystalline particles, and is then applied to them. A transparent polycrystalline material is obtained by sintering the formed body, the transparent polycrystalline material having a polycrystalline structure whose crystal orientation is controlled.Type: GrantFiled: May 23, 2013Date of Patent: July 5, 2016Assignees: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, NATIONAL INSTITUTES OF NATURAL SCIENCES, GENESIS RESEARCH INSTITUTE, INCORPORATEDInventors: Takunori Taira, Jun Akiyama, Shigeo Asai, Kunihiko Hara
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Patent number: 9188738Abstract: Provided is a method for manufacturing a translucent polycrystalline material with optical properties continuously varying in the material. A slurry including single crystal grains that are acted upon by a force when placed in a magnetic field is immobilized in a gradient magnetic field with a spatially varying magnetic flux density and then sintered. For example, where a slurry including single crystal grains of YAG doped with Er and single crystal grains of YAG undoped with a rare earth material is immobilized in the gradient magnetic field, the region with a strong magnetic field becomes a laser oscillation region that is rich in Er-doped YAG, whereas the region with a weak magnetic field becomes a translucent region rich in YAG undoped with a rare earth material. A polycrystalline material having a core with laser oscillations and a guide surrounding the core are obtained at once.Type: GrantFiled: January 4, 2012Date of Patent: November 17, 2015Assignees: Toyota Jidosha Kabushiki Kaisha, Inter-University Research Institute, National Institutes of Natural Sciences, Genesis Research Institute IncorporatedInventors: Takunori Taira, Jun Akiyama, Shigeo Asai
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Publication number: 20130320277Abstract: Provided is a method for manufacturing a translucent polycrystalline material with optical properties continuously varying in the material. A slurry including single crystal grains that are acted upon by a force when placed in a magnetic field is immobilized in a gradient magnetic field with a spatially varying magnetic flux density and then sintered. For example, where a slurry including single crystal grains of YAG doped with Er and single crystal grains of YAG undoped with a rare earth material is immobilized in the gradient magnetic field, the region with a strong magnetic field becomes a laser oscillation region that is rich in Er-doped YAG, whereas the region with a weak magnetic field becomes a translucent region rich in YAG undoped with a rare earth material. A polycrystalline material having a core with laser oscillations and a guide surrounding the core are obtained at once.Type: ApplicationFiled: January 4, 2012Publication date: December 5, 2013Inventors: Takunori Taira, Jun Akiyama, Shigeo Asai
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Publication number: 20130292882Abstract: Upon producing a transparent polycrystalline material, a suspension liquid (or slurry 1) is prepared, the suspension liquid being made by dispersing a raw-material powder in a solution, the raw-material powder including optically anisotropic single-crystalline particles to which a rare-earth element is added. A formed body is obtained from the suspension liquid by means of carrying out slip casting in a space with a magnetic field applied. On this occasion, while doing a temperature control so that the single-crystalline particles demonstrate predetermined magnetic anisotropy, one of static magnetic fields and rotary magnetic fields is selected in compliance with a direction of an axis of easy magnetization in the single-crystalline particles, and is then applied to them. A transparent polycrystalline material is obtained by sintering the formed body, the transparent polycrystalline material having a polycrystalline structure whose crystal orientation is controlled.Type: ApplicationFiled: May 23, 2013Publication date: November 7, 2013Inventors: Takunori TAIRA, Jun AKIYAMA, Shigeo ASAI, Kunihiko HARA
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Patent number: 8470724Abstract: Upon producing a transparent polycrystalline material, a suspension liquid (or slurry 1) is prepared, the suspension liquid being made by dispersing a raw-material powder in a solution, the raw-material powder including optically anisotropic single-crystalline particles to which a rare-earth element is added. A formed body is obtained from the suspension liquid by means of carrying out slip casting in a space with a magnetic field applied. On this occasion, while doing a temperature control so that the single-crystalline particles demonstrate predetermined magnetic anisotropy, one of static magnetic fields and rotary magnetic fields is selected in compliance with a direction of an axis of easy magnetization in the single-crystalline particles, and is then applied to them. A transparent polycrystalline material is obtained by sintering the formed body, the transparent polycrystalline material having a polycrystalline structure whose crystal orientation is controlled.Type: GrantFiled: December 25, 2009Date of Patent: June 25, 2013Assignees: Inter-University Research Institute Corporation, National Institutes of Natural Sciences, Genesis Research Institute, IncorporatedInventors: Takunori Taira, Jun Akiyama, Shigeo Asai, Kunihiko Hara
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Publication number: 20110260367Abstract: Upon producing a transparent polycrystalline material, a suspension liquid (or slurry 1) is prepared, the suspension liquid being made by dispersing a raw-material powder in a solution, the raw-material powder including optically anisotropic single-crystalline particles to which a rare-earth element is added. A formed body is obtained from the suspension liquid by means of carrying out slip casting in a space with a magnetic field applied. On this occasion, while doing a temperature control so that the single-crystalline particles demonstrate predetermined magnetic anisotropy, one of static magnetic fields and rotary magnetic fields is selected in compliance with a direction of an axis of easy magnetization in the single-crystalline particles, and is then applied to them. A transparent polycrystalline material is obtained by sintering the formed body, the transparent polycrystalline material having a polycrystalline structure whose crystal orientation is controlled.Type: ApplicationFiled: December 25, 2009Publication date: October 27, 2011Applicants: Genesis Research Institute, Incorporated, Inter-University Research Institute CorporationInventors: Takunori Taira, Jun Akiyama, Shigeo Asai, Kunihiko Hara
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Publication number: 20090324467Abstract: A magnetic chemical absorbent according to the present invention is provided with a composite, which is constituted of a core substance comprising magnetite fine particles and schwertmannite being precipitated around the core substance to chemically bond therewith. This magnetic chemical absorbent can be produced in a hydrolysis reaction step, in which crystal of schwertmannite is precipitated by means of hydrolysis reaction by heating a solution of ferric salt and thereafter adding a reactive substance thereto, by means of adding magnetite fine particles into the solution after the solution is heated and before the precipitation of the crystal begins. This magnetic chemical absorbent is novel and good one whose absorption capability for harmful ion is upgraded more. In accordance with a waste-liquid treating method using this magnetic chemical substance, it is possible to intend the reduction of burdens in view of environmental and economic aspects. Moreover, this magnetic chemical absorbent is recyclable.Type: ApplicationFiled: August 27, 2007Publication date: December 31, 2009Applicant: National University Corporation Nagoya UniversityInventors: Masazumi Okido, Yoshiyuki Bando, Akbar Eskandarpour, Kensuke Sassa, Shigeo Asai
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Patent number: 6852178Abstract: A static magnetic field and a wave are applied to an electrically conductive fluid so as to satisfy the mathematical expression 2?f<(?/?)B2, where f is the frequency (Hz) of the applied wave, ? is the electrical conductivity (S/m) of the conductive fluid, ? is the density (kg/m3) of the conductive fluid, and B is the strength of the applied static magnetic field (T), to thereby generate and propagate vibratory motion into the conductive fluid.Type: GrantFiled: April 26, 2002Date of Patent: February 8, 2005Assignee: Nagoya UniversityInventors: Kazuhiko Iwai, Shigeo Asai
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Publication number: 20040065428Abstract: A given magnetic field and a given wave are applied to a conductive fluid so as to satisfy the relations of:Type: ApplicationFiled: July 3, 2003Publication date: April 8, 2004Applicant: NAGOYA UNIVERSITYInventors: Kazuhiko Iwai, Shigeo Asai, Rene Moreau
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Patent number: 6579490Abstract: An apparatus for generating compression waves in a conductive liquid comprises a vessel containing a conductive liquid and ac electromagnetic force applying means provided around the vessels for generating the compression waves to achieve improvement after solidification of the liquid by enchancing strength of the compression waves by setting the ac frequency “f” of ac electromagnetic force applying means only within the range defined by the expression 2/(L2&pgr;&mgr;&sgr;)≦f≦(c2&mgr;&sgr;)/2&pgr;, wherein f is a major frequency when a waveform of an electromagnetic force is developed by the Fourier transform, for a non-sine waveform, L is a characteristic length of the system, such as a depth or a radius of the vessel, &mgr; is the permeability of the conductive liquid, &sgr; is the electric conductivity of the conductive liquid, and c is the propagation velocity of the compression waves in the conductive liquid.Type: GrantFiled: September 8, 2000Date of Patent: June 17, 2003Assignee: Nagoya UniversityInventors: Kazuhiko Iwai, Shigeo Asai, Qiang Wang
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Publication number: 20020177530Abstract: A static magnetic field and a wave are applied to an electrically conductive fluid so as to satisfy the mathematical expressionType: ApplicationFiled: April 26, 2002Publication date: November 28, 2002Inventors: Kazuhiko Iwai, Shigeo Asai
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Patent number: 6336496Abstract: An object of the present invention is to provide a process for continuously casting a molten metal which process suppresses the instability of the initial solidification and stably improves the lubrication and the surface properties of the cast metal, and an apparatus therefore, in the process for continuously casting a molten metal an alternating current is applied to an electromagnetic coil which is provided so that it surrounds a continuous casting mold wall or is embedded in the side wall of the mold, whereby an electromagnetic force is exerted on the molten metal poured into the mold which either oscillates in a constant mode or does not oscillate and is starting to be solidified the process of the present invention also comprises periodically changing the amplitude or waveform of the alternating current to be applied, and the apparatus of the present invention is used for the process.Type: GrantFiled: September 16, 1997Date of Patent: January 8, 2002Assignees: Nippon Steel Corporation, Shingeo AsaiInventors: Shigeo Asai, Takehiko Toh, Kiyoshi Wajima, Kenzo Sawada, Eiichi Takeuchi, Kensuke Sassa, Tingju Li
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Patent number: 6274022Abstract: A method for producing electro- or electroless-deposited-film, in which the crystal orientation of the film is controlled to provide improved product properties. A paramagnetic material or diamagnetic material in its electrolytic-state is deposited on a substrate by an electro- or electroless-deposition process. A magnetic field having an intensity at least on the order of 7 T is applied in a predetermined direction, so as to perform the deposition in environment added with the magnetic field. A porous plate is preferably arranged adjacent to the substrate, for suppressing flow of an electrolytic liquid that may occur during the application of the magnetic field.Type: GrantFiled: August 31, 1999Date of Patent: August 14, 2001Assignee: Nagoya UniversityInventors: Shigeo Asai, Kensuke Sassa, Takahisa Taniguchi
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Patent number: 5722480Abstract: An object of the present invention is to provide a process for continuously casting a molten metal which process suppresses the instability of the initial solidification and stably improves the lubrication and the surface properties of the cast metal, and an apparatus therefor, in the process for continuously casting a molten metal an alternating current is applied to an electromagnetic coil which is provided so that it surrounds a continuous casting mold wall or is embedded in the side wall of the mold, whereby an electromagnetic force is exerted on the molten metal poured into the mold which either oscillates in a constant mode or does not oscillate and is starting to be solidified the process of the present invention also comprises periodically changing the amplitude or waveform of the alternating current to be applied, and the apparatus of the present invention is used for the process.Type: GrantFiled: April 17, 1996Date of Patent: March 3, 1998Assignees: Nippon Steel Corporation, Shigeo AsaiInventors: Shigeo Asai, Takehiko Toh, Kiyoshi Wajima, Kenzo Sawada, Eiichi Takeuchi, Kensuke Sassa, Tingju Li