Patents by Inventor Wataru Yamagishi
Wataru Yamagishi 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: 11940466Abstract: A ceramic according to the present invention includes, in mass %, BN: 20.0 to 55.0%, SiC: 5.0 to 40.0%, ZrO2 and/or Si3N4: 3.0 to 60.0%. The ceramic has a coefficient of thermal expansion at ?50 to 500° C. of 1.0×10?6 to 5.0×10?6/° C., is excellent in low electrostatic properties (106 to 1014 ?·cm in volume resistivity) and free-machining properties, and is thus suitable to be used for, for example, a probe guiding member for guiding probes of a probe card, and a socket for package inspection.Type: GrantFiled: October 19, 2018Date of Patent: March 26, 2024Assignee: FERROTEC MATERIAL TECHNOLOGIES CORPORATIONInventors: Wataru Yamagishi, Kazumasa Mori, Shunichi Eto
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Publication number: 20230312423Abstract: A ceramic containing, in mass %: Si3N4: 20.0 to 60.0%, ZrO2: 25.0 to 70.0%, at least one selected from SiC and AlN: 2.0 to 17.0%, where AlN is 10.0% or less, at least one selected from MgO, Y2O3, CeO2, CaO, HfO2, TiO2, Al2O3, SiO2, MoO3, CrO, CoO, ZnO, Ga2O3, Ta2O5, NiO and V2O5: 5.0 to 15.0%, wherein Fn calculated from the following equation (1) satisfies 0.02 to 0.40. This ceramic can be laser machined with high efficiency.Type: ApplicationFiled: April 8, 2021Publication date: October 5, 2023Applicant: FERROTEC MATERIAL TECHNOLOGIES CORPORATIONInventors: Wataru YAMAGISHI, Kazumasa MORI, Shunichi ETO
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Patent number: 11485686Abstract: A ceramic contains, in mass percent: Si3N4: 20.0 to 60.0%, ZrO2: 25.0 to 70.0%, and one or more oxides selected from MgO, Y2O3, CeO2, CaO, HfO2, TiO2, Al2O3, SiO2, MoO3, CrO, CoO, ZnO, Ga2O3, Ta2O5, NiO, and V2O5: 5.0 to 15.0%. The ceramic has a coefficient of thermal expansion as high as that of silicon and an excellent mechanical strength, allows fine machining with high precision, and prevents particles from being produced.Type: GrantFiled: November 7, 2018Date of Patent: November 1, 2022Assignee: FERROTEC MATERIAL TECHNOLOGIES CORPORATIONInventors: Wataru Yamagishi, Kazumasa Mori, Shunichi Eto
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Publication number: 20210188714Abstract: A ceramic contains, in mass percent: Si3N4: 20.0 to 60.0%, ZrO2: 25.0 to 70.0%, and one or more oxides selected from MgO, Y2O3, CeO2, CaO, HfO2, TiO2, Al2O3, SiO2, MoO3, CrO, CoO, ZnO, Ga2O3, Ta2O5, NiO, and V2O5: 5.0 to 15.0%. The ceramic has a coefficient of thermal expansion as high as that of silicon and an excellent mechanical strength, allows fine machining with high precision, and prevents particles from being produced.Type: ApplicationFiled: November 7, 2018Publication date: June 24, 2021Applicant: FERROTEC MATERIAL TECHNOLOGIES CORPORATIONInventors: Wataru YAMAGISHI, Kazumasa MORI, Shunichi ETO
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Publication number: 20200241047Abstract: A ceramic according to the present invention includes, in mass %, BN: 20.0 to 55.0%, SiC: 5.0 to 40.0%, ZrO2 and/or Si3N4: 3.0 to 60.0%. The ceramic has a coefficient of thermal expansion at ?50 to 500° C. of 1.0×10?6 to 5.0×10?6/° C., is excellent in low electrostatic properties (106 to 1014 ?·cm in volume resistivity) and free-machining properties, and is thus suitable to be used for, for example, a probe guiding member for guiding probes of a probe card, and a socket for package inspection.Type: ApplicationFiled: October 19, 2018Publication date: July 30, 2020Applicant: FERROTEC MATERIAL TECHNOLOGIES CORPORATIONInventors: Wataru YAMAGISHI, Kazumasa MORI, Shunichi ETO
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Patent number: 8202571Abstract: The method for manufacturing a magnetic recording medium in a shape of a disk includes forming convex sections repeating on the upper surface of an intermediate layer in the radial direction of the disk, and each having an upper surface that repulses magnetic particles; and filling the magnetic particles into concave sections sandwiched by the convex sections in a self-assembling way to form a magnetic recording layer with the magnetic particles.Type: GrantFiled: February 16, 2010Date of Patent: June 19, 2012Assignee: Showa Denko K.K.Inventors: Hiroyoshi Kodama, Wataru Yamagishi, Takuya Uzumaki, Atsushi Tanaka
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Patent number: 7768731Abstract: A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr1×t1?Mr2×t2| where Mr1 and Mr2 denote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and t1 and t2 denote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.Type: GrantFiled: January 26, 2009Date of Patent: August 3, 2010Assignee: Showa Denko K.K.Inventors: Akihiro Inomata, Antony Ajan, Jun Taguchi, Koji Matsumoto, Wataru Yamagishi
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Publication number: 20100140214Abstract: The method for manufacturing a magnetic recording medium in a shape of a disk includes forming convex sections repeating on the upper surface of an intermediate layer in the radial direction of the disk, and each having an upper surface that repulses magnetic particles; and filling the magnetic particles into concave sections sandwiched by the convex sections in a self-assembling way to form a magnetic recording layer with the magnetic particles.Type: ApplicationFiled: February 16, 2010Publication date: June 10, 2010Applicant: SHOWA DENKO K.K.Inventors: Hiroyoshi KODAMA, Wataru YAMAGISHI, Takuya UZUMAKI, Atsushi TANAKA
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Publication number: 20090135513Abstract: A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr1×t1?Mr2×t2| where Mr1 and Mr2 denote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and t1 and t2 denote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.Type: ApplicationFiled: January 26, 2009Publication date: May 28, 2009Applicant: FUJITSU LIMITEDInventors: Akihiro Inomata, Antony Ajan, Jun Taguchi, Koji Matsumoto, Wataru Yamagishi
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Patent number: 7502188Abstract: A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr1×t1?Mr2×t2| where Mr1 and Mr2 denote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and t1 and t2 denote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.Type: GrantFiled: September 24, 2004Date of Patent: March 10, 2009Assignee: Fujitsu LimitedInventors: Akihiro Inomata, Antony Ajan, Jun Taguchi, Koji Matsumoto, Wataru Yamagishi
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Publication number: 20070190365Abstract: The present invention provides a novel discrete track medium having a high magnetic recording density and manufacturing method therefor. This magnetic recording medium is a disk-shaped magnetic recording medium comprising a soft magnetic layer, a magnetic layer thereover, and an intermediate layer directly under the magnetic recording layer, wherein the magnetic recording layer comprises a plurality of magnetic recording tracks arranged in the radial direction of the magnetic recording medium, and each magnetic recording track is separated from the other in the radial direction of the disk by concave sections and convex sections formed alternately on the upper surface of the intermediate layer in the radial direction of the disk.Type: ApplicationFiled: May 26, 2006Publication date: August 16, 2007Applicant: FUJITSU LIMITEDInventors: Hiroyoshi Kodama, Wataru Yamagishi, Takuya Uzumaki, Atsushi Tanaka
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Publication number: 20050146992Abstract: A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr1×t1?Mr2×t2| where Mr1 and Mr2 denote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and t1 and t2 denote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.Type: ApplicationFiled: September 24, 2004Publication date: July 7, 2005Inventors: Akihiro Inomata, Antony Ajan, Jun Taguchi, Koji Matsumoto, Wataru Yamagishi
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Patent number: 6773782Abstract: The surface of a disk medium includes a substrate whose surface includes grooves and lands. A non-magnetic underlayer and a magnetic recording layer are formed on the substrate. Smoothing non-magnetic film fills the grooves, which are covered with the non-magnetic underlayer and the magnetic recording layer, so that the height of the magnetic recording layer above the grooves may reach the same level as the height of the magnetic recording layer above the lands.Type: GrantFiled: November 21, 2001Date of Patent: August 10, 2004Assignee: Fujitsu LimitedInventors: Hiroto Takeshita, Wataru Yamagishi
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Patent number: 6763311Abstract: A calculating device and method provided for a shaking test apparatus for carrying out a shaking test on a structure by using a partial structure and a numerical model which is virtually connected to the partial structure. The calculating device includes a calculation part which identifies a vibration model corresponding to the partial structure on the basis of displacement and reaction force detected in response to shaking and which combines the vibration model and the numerical model with each other to construct a model of the overall system corresponding to the structure and calculates the shaking response of the overall system model.Type: GrantFiled: January 3, 2002Date of Patent: July 13, 2004Assignee: Hitachi, Ltd.Inventors: Masahiko Inoue, Toshihiko Horiuchi, Yasuyuki Momoi, Takao Konno, Wataru Yamagishi
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Patent number: 6629042Abstract: The present invention discloses a testing system and a testing method for a structure which tests a structure made of a test piece structure and a numerical model virtually connected to the structure. A simulated structure including a frame, an actuator and a reaction force measuring device is mounted on a foundation on which a shaking table is also mounted. Only the test piece structure is mounted on the shaking table. The motion of the shaking table 5 which is generated at the time of shaking the test piece structure using the shaking table and the actuator is measured by a shaking table motion measuring device, while the reaction force generated by the test piece structure is measured by a reaction force measuring device. Using these measured values and the numerical model stored in a digital computer, the motion of the test piece structure after a predetermined period for the motion of the simulated structure is calculated.Type: GrantFiled: March 27, 2002Date of Patent: September 30, 2003Assignee: Hitachi, Ltd.Inventors: Wataru Yamagishi, Toshihiko Horiuchi, Masahiko Inoue, Kazuhiro Umekita, Yasuyuki Momoi
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Patent number: 6586044Abstract: A magnetic hard disk having magnetic tracks for storing data which is read or written by a magnetic head floating immediately above the magnetic track while the magnetic hard disk is rotating, and the magnetic head rests on the magnetic hard disk while the magnetic hard disk is not rotating. One aspect of the present invention is that the magnetic hard disk comprises a non-magnetic substrate having a plurality of banks and grooves alternately and concentrically arranged thereon, a magnetic film formed on each of the banks, and non-magnetic material formed on an entire surface of the substrate all over the banks and grooves such that roughness of the upper surface of the non-magnetic material is in a range between 0.5 nm and 3 nm.Type: GrantFiled: September 27, 2002Date of Patent: July 1, 2003Assignee: Fujitsu LimitedInventors: Hiroto Takeshita, Ryoichi Mukai, Wataru Yamagishi
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Patent number: 6583957Abstract: A magnetic hard disk has magnetic tracks for storing data, which is read or written by a magnetic head floating immediately above the magnetic track while the magnetic hard disk is rotating. The magnetic head rests on the magnetic hard disk while the magnetic hard disk is not rotating. The magnetic hard disk comprises a non-magnetic substrate having a plurality of banks and grooves alternately and concentrically arranged thereon, a magnetic film formed on each of the banks, and a non-magnetic material formed on an entire surface of the substrate all over the banks and grooves such that roughness of the upper surface of the non-magnetic material is in a range between 0.5 nm and 3 nm.Type: GrantFiled: December 22, 1999Date of Patent: June 24, 2003Assignee: Fujitsu LimitedInventors: Hiroto Takeshita, Ryoichi Mukai, Wataru Yamagishi
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Publication number: 20030112560Abstract: A magnetic hard disk having magnetic tracks for storing data which is read or written by a magnetic head floating immediately above the magnetic track while the magnetic hard disk is rotating, and the magnetic head rests on the magnetic hard disk while the magnetic hard disk is not rotating. One aspect of the present invention is that the magnetic hard disk comprises a non-magnetic substrate having a plurality of banks and grooves alternately and concentrically arranged thereon, a magnetic film formed on each of the banks, and non-magnetic material formed on an entire surface of the substrate all over the banks and grooves such that roughness of the upper surface of the non-magnetic material is in a range between 0.5 nm and 3 nm.Type: ApplicationFiled: September 27, 2002Publication date: June 19, 2003Applicant: Fujitsu LimitedInventors: Hiroto Takeshita, Ryoichi Mukai, Wataru Yamagishi
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Publication number: 20020116136Abstract: The present invention discloses a testing system and a testing method for a structure which tests a structure made of a test piece structure and a numerical model virtually connected to the structure. A simulated structure including a frame, an actuator and a reaction force measuring device is mounted on a foundation on which a shaking table is also mounted. Only the test piece structure is mounted on the shaking table. The motion of the shaking table 5 which is generated at the time of shaking the test piece structure using the shaking table and the actuator is measured by a shaking table motion measuring device, while the reaction force generated by the test piece structure is measured by a reaction force measuring device. Using these measured values and the numerical model stored in a digital computer, the motion of the test piece structure after a predetermined period for the motion of the simulated structure is calculated.Type: ApplicationFiled: March 27, 2002Publication date: August 22, 2002Applicant: Hitachi, Ltd.Inventors: Wataru Yamagishi, Toshihiko Horiuchi, Masahiko Inoue, Kazuhiro Umekita, Yasuyuki Momoi
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Patent number: 6397153Abstract: The present invention discloses a testing system and a testing method for a structure which tests a structure made of a test piece structure and a numerical model virtually connected to the structure. A simulated structure including a frame, an actuator and a reaction force measuring device is mounted on a foundation on which a shaking table is also mounted. Only the test piece structure is mounted on the shaking table. The motion of the shaking table 5 which is generated at the time of shaking the test piece structure using the shaking table and the actuator is measured by a shaking table motion measuring device, while the reaction force generated by the test piece structure is measured by a reaction force measuring device. Using these measured values and the numerical model stored in a digital computer, the motion of the test piece structure after a predetermined period for the motion of the simulated structure is calculated.Type: GrantFiled: June 25, 1999Date of Patent: May 28, 2002Assignee: Hitachi, Ltd.Inventors: Wataru Yamagishi, Toshihiko Horiuchi, Masahiko Inoue, Kazuhiro Umekita, Yasuyuki Momoi