Patents by Inventor Masahito Oyanagi
Masahito Oyanagi 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: 10937456Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 ?m, the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°, and the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 55.0°.Type: GrantFiled: February 27, 2017Date of Patent: March 2, 2021Assignee: FUJIFILM CorporationInventors: Norihito Kasada, Takuto Kurokawa, Masahito Oyanagi
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Patent number: 10910009Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050.Type: GrantFiled: June 19, 2018Date of Patent: February 2, 2021Assignee: FUJIFILM CorporationInventors: Masahito Oyanagi, Norihito Kasada, Toshio Tada, Takuro Sugiyama
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Patent number: 10896692Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 ?m, and the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°.Type: GrantFiled: February 27, 2017Date of Patent: January 19, 2021Assignee: FUJIFILM CorporationInventors: Takuto Kurokawa, Norihito Kasada, Masahito Oyanagi
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Patent number: 10861491Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder, abrasive, and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra measured on the surface of the magnetic layer is less than or equal to 1.8 nm, the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 60.0°, and the coefficient of friction that is measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35.Type: GrantFiled: February 27, 2017Date of Patent: December 8, 2020Assignee: FUJIFILM CorporationInventors: Masahito Oyanagi, Norihito Kasada, Takuto Kurokawa
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Patent number: 10692522Abstract: The magnetic recording medium has a non-magnetic support and a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, and a squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00. The present invention also provides a method for manufacturing the magnetic recording medium.Type: GrantFiled: September 15, 2017Date of Patent: June 23, 2020Assignee: FUJIFILM CorporationInventors: Toshio Tada, Norihito Kasada, Masahito Oyanagi, Akinori Sugishima, Kengo Saito
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Patent number: 10573341Abstract: The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1, and ?SFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: ?SFD=SFD25° C.?SFD?190° C., ranges from 0.50 to 1.60.Type: GrantFiled: December 22, 2016Date of Patent: February 25, 2020Assignee: FUJIFILM CorporationInventors: Toshio Tada, Norihito Kasada, Masahito Oyanagi
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Patent number: 10540996Abstract: A magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support. The magnetic layer contains a fatty acid ester. The full width at half maximum of the spacing distribution as measured by optical interferometry on the magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm. The full width at half maximum of the spacing distribution after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm. The difference between the spacing Safter after vacuum heating the magnetic tape and the spacing Sbefore before vacuum heating the magnetic tape, Safter?Sbefore, is greater than 0 nm but less than or equal to 8.0 nm.Type: GrantFiled: September 29, 2016Date of Patent: January 21, 2020Assignee: FUJIFILM CorporationInventors: Eiki Ozawa, Norihito Kasada, Masahito Oyanagi, Toshio Tada
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Patent number: 10515660Abstract: A magnetic tape is provided in which the center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050. A back coating layer includes one or more components selected from a fatty acid and a fatty acid amide. In addition, the C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed regarding the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 35 atom %.Type: GrantFiled: June 9, 2017Date of Patent: December 24, 2019Assignee: FUJIFILM CorporationInventors: Masahito Oyanagi, Norihito Kasada
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Patent number: 10475481Abstract: The magnetic tape has a magnetic layer and a backcoat layer. The Ra on the magnetic layer side surface is less than or equal to 1.8 nm, the coefficient of friction measured on the base portion of the magnetic layer side surface is less than or equal to 0.35, and the Ra measured on the backcoat layer side surface is less than or equal to 5.0 nm. The backcoat layer contains a fatty acid ester. In addition, the FWHMbefore measured on the backcoat layer side surface before vacuum heating is greater than 0 nm but less than or equal to 10.0 nm, the FWHMafter after vacuum heating is greater than 0 nm but less than or equal to 10.0 nm, and the difference between the spacing measured on the backcoat layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm.Type: GrantFiled: February 2, 2017Date of Patent: November 12, 2019Assignee: FUJIFILM CorporationInventors: Masahito Oyanagi, Norihito Kasada, Eiki Ozawa
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Patent number: 10347279Abstract: A magnetic tape has a magnetic layer and a backcoat layer. Each of the magnetic layer and the backcoat layer contains a fatty acid ester. The Ra measured on the magnetic layer side surface is less than or equal to 2.8 nm. The difference between the spacing measured by optical interferometry on the magnetic layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm. The FWHMbefore on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm. The FWHMafter on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm. The difference between the spacing measured on the backcoat layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm.Type: GrantFiled: February 2, 2017Date of Patent: July 9, 2019Assignee: FUJIFILM CorporationInventors: Eiki Ozawa, Masahito Oyanagi, Norihito Kasada
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Publication number: 20180301165Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050.Type: ApplicationFiled: June 19, 2018Publication date: October 18, 2018Applicant: FUJIFILM CorporationInventors: Masahito OYANAGI, Norihito KASADA, Toshio TADA, Takuro SUGIYAMA
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Patent number: 10026435Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on the surface on one side of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the surface on the other side of the nonmagnetic support, wherein the backcoat layer is less than or equal to 0.30 ?m in thickness; and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060.Type: GrantFiled: August 19, 2016Date of Patent: July 17, 2018Assignee: FUJIFILM CorporationInventors: Norihito Kasada, Masahito Oyanagi, Toshio Tada, Takuro Sugiyama
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Patent number: 10026434Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050.Type: GrantFiled: August 19, 2016Date of Patent: July 17, 2018Assignee: FUJIFILM CorporationInventors: Masahito Oyanagi, Norihito Kasada, Toshio Tada, Takuro Sugiyama
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Patent number: 10026430Abstract: The magnetic tape comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder, nonmagnetic powder, and binder, wherein a total thickness of the magnetic tape is less than or equal to 4.80 ?m, and a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35.Type: GrantFiled: September 28, 2015Date of Patent: July 17, 2018Assignee: FUJIFILM CorporationInventors: Norihito Kasada, Masahito Oyanagi, Toshio Tada, Yasuhiro Kawatani
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Publication number: 20180082710Abstract: The magnetic recording medium has a non-magnetic support and a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, and a squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00. The present invention also provides a method for manufacturing the magnetic recording medium.Type: ApplicationFiled: September 15, 2017Publication date: March 22, 2018Applicant: FUJIFILM CorporationInventors: Toshio TADA, Norihito KASADA, Masahito OYANAGI, Akinori SUGISHIMA, Kengo SAITO
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Publication number: 20170372737Abstract: Provided is a magnetic tape in which a center line average surface roughness Ra measured regarding a surface of a magnetic layer is equal to or smaller than 1.8 nm, logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, a back coating layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed regarding a surface of the back coating layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 35 atom %.Type: ApplicationFiled: June 9, 2017Publication date: December 28, 2017Applicant: FUJIFILM CorporationInventors: Masahito OYANAGI, Norihito KASADA
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Publication number: 20170249965Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 ?m, and the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°.Type: ApplicationFiled: February 27, 2017Publication date: August 31, 2017Applicant: FUJIFILM CorporationInventors: Takuto KUROKAWA, Norihito KASADA, Masahito OYANAGI
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Publication number: 20170249963Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder, abrasive, and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra measured on the surface of the magnetic layer is less than or equal to 1.8 nm, the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 60.0°, and the coefficient of friction that is measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35.Type: ApplicationFiled: February 27, 2017Publication date: August 31, 2017Applicant: FUJIFILM CorporationInventors: Masahito OYANAGI, Norihito KASADA, Takuto KUROKAWA
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Publication number: 20170249964Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 ?m, the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°, and the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 55.0°.Type: ApplicationFiled: February 27, 2017Publication date: August 31, 2017Applicant: FUJIFILM CorporationInventors: Norihito KASADA, Takuto KUROKAWA, Masahito OYANAGI
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Publication number: 20170221517Abstract: The magnetic tape has a magnetic layer and a backcoat layer, wherein, each of the magnetic layer and backcoat layer contains a fatty acid ester, the Ra measured on the magnetic layer side surface is less than or equal to 2.8 nm, the difference between the spacing measured by optical interferometry on the magnetic layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm, the FWHMbefore on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm, the FWHMafter on the backcoat layer side surface is greater than 0 nm but less than or equal to 10.0 nm; and the difference between the spacing measured on the backcoat layer side surface after and before vacuum heating is greater than 0 nm but less than or equal to 8.0 nm.Type: ApplicationFiled: February 2, 2017Publication date: August 3, 2017Applicant: FUJIFILM CorporationInventors: Eiki OZAWA, Masahito OYANAGI, Norihito KASADA