Patents by Inventor Junya SAWADA
Junya SAWADA 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: 12555603Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. Sci obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 1.40 or more and 1.60 or less, and standard deviation ? of the Sci in a width direction of the surface of the magnetic layer is 0.05 or less. In Equation A, Sq is a root-mean-square height Sq specified in ISO 25178, Vv(h0.05)-Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 5% or more and 80% or less, and A is a measurement region area. Sci = ( Vv ? ( h 0.05 ) - Vv ? ( h 0.Type: GrantFiled: June 28, 2024Date of Patent: February 17, 2026Assignee: FUJIFILM CorporationInventors: Norihito Kasada, Nobuhito Onozuka, Junya Sawada, Ryosuke Yumiyama
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Patent number: 12482494Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. An arithmetic average curvature Spc of a peak point specified in ISO 25178 on a surface of the magnetic layer is 0.30 (1/?m) or more and 0.70 (1/?m) or less, and standard deviation a of the Spc in a width direction of the surface of the magnetic layer is 0.15 (1/?m) or less.Type: GrantFiled: June 28, 2024Date of Patent: November 25, 2025Assignee: FUJIFILM CorporationInventors: Ryosuke Yumiyama, Norihito Kasada, Nobuhito Onozuka, Junya Sawada
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Patent number: 12462839Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A dale void volume Vvv specified in ISO 25178 on a surface of the magnetic layer is 0.100 nm3 or more and 0.350 nm3 or less, and standard deviation a of the Vvv in a width direction of the surface of the magnetic layer is 0.020 nm3 or less.Type: GrantFiled: June 28, 2024Date of Patent: November 4, 2025Assignee: FUJIFILM CorporationInventors: Junya Sawada, Norihito Kasada, Nobuhito Onozuka, Ryosuke Yumiyama
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Patent number: 12431163Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. Svi obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 0.080 or more and 0.130 or less, and standard deviation ? of the Svi in a width direction of the surface of the magnetic layer is 0.010 or less. In Equation A, Sq is a root-mean-square height Sq specified in ISO 25178, Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 80% or more and 100% or less, and A is a measurement region area. Svi = ( Vv ? ( h 0.Type: GrantFiled: June 28, 2024Date of Patent: September 30, 2025Assignee: FUJIFILM CorporationInventors: Junya Sawada, Norihito Kasada, Nobuhito Onozuka, Ryosuke Yumiyama
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Patent number: 12406693Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. VIVA 0.1, which is a height that is obtained by measuring a surface of the magnetic layer with an atomic force microscope and at which a cross-sectional area is 0.1% with a measurement region area as 100%, is 5 nm or more and 10 nm or less, and standard deviation ? of the VIVA 0.1 in a width direction of the surface of the magnetic layer is 1.0 nm or less.Type: GrantFiled: June 28, 2024Date of Patent: September 2, 2025Assignee: FUJIFILM CorporationInventors: Nobuhito Onozuka, Norihito Kasada, Ryosuke Yumiyama, Junya Sawada
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Patent number: 12406692Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A core void volume Vvc specified in international organization for standardization (ISO) 25178 on a surface of the magnetic layer is 1.200 nm3 or more and 3.000 nm3 or less, and standard deviation ? of the Vvc in a width direction of the surface of the magnetic layer is 0.120 nm3 or less.Type: GrantFiled: June 28, 2024Date of Patent: September 2, 2025Assignee: FUJIFILM CorporationInventors: Norihito Kasada, Nobuhito Onozuka, Junya Sawada, Ryosuke Yumiyama
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Patent number: 12400681Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. CS VIVA 0.1, which is a height that is obtained by measuring a surface of the magnetic layer with an atomic force microscope and at which a cutout length is 0.1% with a length of one side of a measurement region as 100%, is 4 nm or more and 10 nm or less, and standard deviation a of the CS VIVA 0.1 in a width direction of the surface of the magnetic layer is 1.0 nm or less.Type: GrantFiled: June 28, 2024Date of Patent: August 26, 2025Assignee: FUJIFILM CorporationInventors: Nobuhito Onozuka, Norihito Kasada, Ryosuke Yumiyama, Junya Sawada
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Patent number: 12367905Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A protruding peak height Spk specified in ISO 25178 on a surface of the magnetic layer is 1.5 nm or more and 3.0 nm or less, and standard deviation ? of the Spk in a width direction of the surface of the magnetic layer is 0.5 nm or less.Type: GrantFiled: June 28, 2024Date of Patent: July 22, 2025Assignee: FUJIFILM CorporationInventors: Ryosuke Yumiyama, Norihito Kasada, Nobuhito Onozuka, Junya Sawada
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Publication number: 20250014601Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. Svi obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 0.080 or more and 0.130 or less, and standard deviation ? of the Svi in a width direction of the surface of the magnetic layer is 0.010 or less. In Equation A, Sq is a root-mean-square height Sq specified in ISO 25178, Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 80% or more and 100% or less, and A is a measurement region area. Svi = ( Vv ? ( h 0.Type: ApplicationFiled: June 28, 2024Publication date: January 9, 2025Applicant: FUJIFILM CorporationInventors: Junya Sawada, Norihito Kasada, Nobuhito Onozuka, Ryosuke Yumiyama
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Publication number: 20250014598Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A protruding peak height Spk specified in ISO 25178 on a surface of the magnetic layer is 1.5 nm or more and 3.0 nm or less, and standard deviation ? of the Spk in a width direction of the surface of the magnetic layer is 0.5 nm or less.Type: ApplicationFiled: June 28, 2024Publication date: January 9, 2025Applicant: FUJIFILM CorporationInventors: Ryosuke YUMIYAMA, Norihito Kasada, Nobuhito Onozuka, Junya Sawada
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Publication number: 20250014600Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. VIVA 0.1, which is a height that is obtained by measuring a surface of the magnetic layer with an atomic force microscope and at which a cross-sectional area is 0.1% with a measurement region area as 100%, is 5 nm or more and 10 nm or less, and standard deviation ? of the VIVA 0.1 in a width direction of the surface of the magnetic layer is 1.0 nm or less.Type: ApplicationFiled: June 28, 2024Publication date: January 9, 2025Applicant: FUJIFILM CorporationInventors: Nobuhito Onozuka, Norihito Kasada, Ryosuke Yumiyama, Junya Sawada
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Publication number: 20250014599Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A core void volume Vvc specified in international organization for standardization (ISO) 25178 on a surface of the magnetic layer is 1.200 nm3 or more and 3.000 nm3 or less, and standard deviation a of the Vvc in a width direction of the surface of the magnetic layer is 0.120 nm3 or less.Type: ApplicationFiled: June 28, 2024Publication date: January 9, 2025Applicant: FUJIFILM CorporationInventors: Norihito Kasada, Nobuhito Onozuka, Junya Sawada, Ryosuke Yumiyama
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Publication number: 20250014604Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. Sci obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 1.40 or more and 1.60 or less, and standard deviation ? of the Sci in a width direction of the surface of the magnetic layer is 0.05 or less. In Equation A, Sq is a root-mean-square height Sq specified in ISO 25178, Vv(h0.05)-Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 5% or more and 80% or less, and A is a measurement region area. Sci = ( Vv ? ( h 0.05 ) - Vv ? ( h 0.Type: ApplicationFiled: June 28, 2024Publication date: January 9, 2025Applicant: FUJIFILM CorporationInventors: Norihito KASADA, Nobuhito ONOZUKA, Junya SAWADA, Ryosuke YUMIYAMA
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Publication number: 20250014603Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. An arithmetic average curvature Spc of a peak point specified in ISO 25178 on a surface of the magnetic layer is 0.30 (1/?m) or more and 0.70 (1/?m) or less, and standard deviation a of the Spc in a width direction of the surface of the magnetic layer is 0.15 (1/?m) or less.Type: ApplicationFiled: June 28, 2024Publication date: January 9, 2025Applicant: FUJIFILM CorporationInventors: Ryosuke YUMIYAMA, Norihito KASADA, Nobuhito ONOZUKA, Junya SAWADA
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Publication number: 20250014602Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. CS VIVA 0.1, which is a height that is obtained by measuring a surface of the magnetic layer with an atomic force microscope and at which a cutout length is 0.1% with a length of one side of a measurement region as 100%, is 4 nm or more and 10 nm or less, and standard deviation a of the CS VIVA 0.1 in a width direction of the surface of the magnetic layer is 1.0 nm or less.Type: ApplicationFiled: June 28, 2024Publication date: January 9, 2025Applicant: FUJIFILM CorporationInventors: Nobuhito Onozuka, Norihito Kasada, Ryosuke Yumiyama, Junya Sawada
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Publication number: 20250006225Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A dale void volume Vvv specified in ISO 25178 on a surface of the magnetic layer is 0.100 nm3 or more and 0.350 nm3 or less, and standard deviation a of the Vvv in a width direction of the surface of the magnetic layer is 0.020 nm3 or less.Type: ApplicationFiled: June 28, 2024Publication date: January 2, 2025Applicant: FUJIFILM CorporationInventors: Junya SAWADA, Norihito KASADA, Nobuhito ONOZUKA, Ryosuke YUMIYAMA
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Patent number: 12159656Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which the magnetic layer includes an abrasive, the abrasive is a carbide, an average primary particle diameter of the abrasive is 10 nm or more and 100 nm or less, and in an electron microscope image of a surface of the magnetic layer, assuming that a total area occupied by the abrasive is 100%, a ratio of an area occupied by the abrasive present in an aggregated state having a maximum Feret diameter of 0.2 ?m or more is 50% or more.Type: GrantFiled: November 3, 2022Date of Patent: December 3, 2024Assignee: FUJIFILM CorporationInventors: Junya Sawada, Noriko Oyanagi
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Publication number: 20230154491Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which the magnetic layer includes an abrasive, the abrasive is a carbide, an average primary particle diameter of the abrasive is 10 nm or more and 100 nm or less, and in an electron microscope image of a surface of the magnetic layer, assuming that a total area occupied by the abrasive is 100%, a ratio of an area occupied by the abrasive present in an aggregated state having a maximum Feret diameter of 0.2 µm or more is 50% or more.Type: ApplicationFiled: November 3, 2022Publication date: May 18, 2023Applicant: FUJIFILM CorporationInventors: Junya SAWADA, Noriko Oyanagi