Patents by Inventor Toshio Tada
Toshio Tada 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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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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Patent number: 9818517Abstract: Hexagonal ferrite magnetic particles have an activation volume ranging from 1,000 nm3 to 1,500 nm3, and ?E10%/kT, thermal stability at 10% magnetization reversal, is equal to or greater than 40.Type: GrantFiled: March 25, 2014Date of Patent: November 14, 2017Assignee: FUJIFILM CorporationInventors: Toshio Tada, Hiroyuki Suzuki, Osamu Shimizu
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Patent number: 9741479Abstract: Provided is magnetic powder capable of enhancing simultaneously both magnetic characteristics including SNP and durability of a magnetic recording medium. The hexagonal ferrite magnetic powder for a magnetic recording medium has a Ba/Fe molar ratio of 8.0% or more, a Bi/Fe molar ratio of 2.5% or more and an Al/Fe molar ratio of from 3.0 to 6.0%. The magnetic powder preferably has an activation volume Vact of from 1,400 to 1,800 nm3. The magnetic powder particularly preferably has a coercive force Hc of from 159 to 279 kA/m (which is approximately from 2,000 to 3,500 Oe) and a coercivity distribution SFD of from 0.3 to 1.0. The magnetic powder may contain, as an element that substitutes an Fe site of the hexagonal ferrite, at least one kind selected from divalent transition metals M1 and tetravalent transition metals M2.Type: GrantFiled: October 31, 2014Date of Patent: August 22, 2017Assignees: DOWA ELECTRONICS MATERIALS CO., LTD., FUJIFILM CORPORATIONInventors: Kenji Masada, Hirohisa Omoto, Futoshi Nagashima, Daisuke Abe, Toshio Tada, Norihito Kasada
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Patent number: 9721605Abstract: Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a quantity of components selected from the group consisting of a fatty acid and a fatty acid amide per unit area of the magnetic tape among components that are extracted from a surface on the magnetic layer side of the magnetic tape is less than or equal to 15.0 mg/m2, and a concentration of carbon, C, that is obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface on the magnetic layer side of the magnetic tape is greater than or equal to 50 atom %.Type: GrantFiled: December 22, 2015Date of Patent: August 1, 2017Assignee: FUJIFILM CorporationInventors: Masahito Oyanagi, Norihito Kasada, Toshio Tada, Kazuyuki Kitada
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Patent number: 9721607Abstract: The magnetic recording medium has a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and 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.Type: GrantFiled: June 29, 2016Date of Patent: August 1, 2017Assignee: FUJIFILM CorporationInventors: Toshio Tada, Akinori Sugishima, Tatsuya Yamashita, Norihito Kasada, Masahito Oyanagi
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Patent number: 9711174Abstract: Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein a total thickness of the magnetic tape is less than or equal to 4.80 ?m; at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; and a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape is greater than or equal to 45 atom %.Type: GrantFiled: December 24, 2015Date of Patent: July 18, 2017Assignee: FUJIFILM CorporationInventors: Norihito Kasada, Masahito Oyanagi, Toshio Tada, Kazuyuki Kitada
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Publication number: 20170186456Abstract: 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: ApplicationFiled: December 22, 2016Publication date: June 29, 2017Applicant: FUJIFILM CorporationInventors: Toshio TADA, Norihito KASADA, Masahito OYANAGI
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Publication number: 20170092315Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein 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, and 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: ApplicationFiled: September 29, 2016Publication date: March 30, 2017Applicant: FUJIFILM CorporationInventors: Eiki OZAWA, Norihito KASADA, Masahito OYANAGI, Toshio TADA
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Patent number: 9601146Abstract: An aspect of the present invention relates to a magnetic tape comprising a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein ?SFD in a longitudinal direction of the magnetic tape as calculated with Equation 1 ranges from 0.35 to 1.50: ?SFD=SFD25° C.?SFD?190° C.??Equation 1 wherein, in Equation 1, SFD25° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD?190° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of ?190° C.Type: GrantFiled: June 29, 2015Date of Patent: March 21, 2017Assignee: FUJIFILM CorporationInventors: Norihito Kasada, Masahito Oyanagi, Toshio Tada
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Publication number: 20170053670Abstract: 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: August 19, 2016Publication date: February 23, 2017Applicant: FUJIFILM CorporationInventors: Masahito OYANAGI, Norihito KASADA, Toshio TADA, Takuro SUGIYAMA
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Publication number: 20170053671Abstract: 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: ApplicationFiled: August 19, 2016Publication date: February 23, 2017Applicant: FUJIFILM CorporationInventors: Norihito KASADA, Masahito OYANAGI, Toshio TADA, Takuro SUGIYAMA
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Publication number: 20170004856Abstract: The magnetic recording medium has a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and 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.Type: ApplicationFiled: June 29, 2016Publication date: January 5, 2017Applicant: FUJIFILM CorporationInventors: Toshio TADA, Akinori SUGISHIMA, Tatsuya YAMASHITA, Norihito KASADA, Masahito OYANAGI
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Patent number: 9518173Abstract: The present invention provides a tire rubber composition that makes it possible to suppress discoloration of tires, and a pneumatic tire formed from the rubber composition. The present invention relates to a tire rubber composition containing a bluing agent.Type: GrantFiled: July 24, 2013Date of Patent: December 13, 2016Assignee: SUMITOMO RUBBER INDUSTRIES, LTD.Inventor: Toshio Tada
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Publication number: 20160217817Abstract: A hexagonal ferrite magnetic powder for a magnetic recording medium, containing magnetic powder contains hexagonal ferrite particles having coated on the surface thereof an aluminum hydroxide material, having a Ba/Fe molar ratio of 0.080 or more, a Bi/Fe molar ratio of 0.025 or more, and an Al/Fe molar ratio of from 0.030 to 0.200. The magnetic powder preferably has an activation volume Vact of from 1,300 to 2,000 nm3. The magnetic powder particularly preferably has a coercive force Hc of from 159 to 287 kA/m (approximately from 2,000 to 3,600 Oe) and a coercivity distribution SFD of from 0.3 to 1.0. The magnetic powder may contain one or two or more kinds of a divalent transition metal M1 and a tetravalent transition metal M2, as an element that replaces Fe of the hexagonal ferrite. The magnetic powder has improved magnetic characteristics including SNR and durability.Type: ApplicationFiled: January 21, 2016Publication date: July 28, 2016Inventors: Kenji MASADA, Hirohisa OMOTO, Futoshi NAGASHIMA, Hiroyuki SUZUKI, Toshio TADA
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Publication number: 20160189740Abstract: Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a quantity of components selected from the group consisting of a fatty acid and a fatty acid amide per unit area of the magnetic tape among components that are extracted from a surface on the magnetic layer side of the magnetic tape is less than or equal to 15.0 mg/m2, and a concentration of carbon, C, that is obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface on the magnetic layer side of the magnetic tape is greater than or equal to 50 atom %.Type: ApplicationFiled: December 22, 2015Publication date: June 30, 2016Applicant: FUJIFILM CorporationInventors: Masahito OYANAGI, Norihito KASADA, Toshio TADA, Kazuyuki KITADA
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Publication number: 20160189739Abstract: Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein a total thickness of the magnetic tape is less than or equal to 4.80 ?m; at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; and a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape is greater than or equal to 45 atom %.Type: ApplicationFiled: December 24, 2015Publication date: June 30, 2016Applicant: FUJIFILM CORPORATIONInventors: Norihito Kasada, Masahito Oyanagi, Toshio Tada, Kazuyuki Kitada
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Publication number: 20160093322Abstract: 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: ApplicationFiled: September 28, 2015Publication date: March 31, 2016Applicant: FUJIFILM CORPORATIONInventors: Norihito KASADA, Masahito OYANAGI, Toshio TADA, Yasuhiro KAWATANI
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Patent number: 9251832Abstract: An aspect of the present invention relates to hexagonal ferrite magnetic powder, which has an activation volume ranging from 900 nm3 to 1,600 nm3, and a ratio of a coefficient of plate thickness variation to a coefficient of particle diameter variation, coefficient of plate thickness variation/coefficient of particle diameter coefficient, ranging from 0.20 to 0.60.Type: GrantFiled: March 24, 2014Date of Patent: February 2, 2016Assignee: FUJIFILM CorporationInventors: Hiroyuki Suzuki, Toshio Tada
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Publication number: 20150380036Abstract: An aspect of the present invention relates to a magnetic tape comprising a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein ?SFD in a longitudinal direction of the magnetic tape as calculated with Equation 1 ranges from 0.35 to 1.50: ?SFD=SFD25° C.?SFD?190° C.??Equation 1 wherein, in Equation 1, SFD25° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD?190° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of ?190° C.Type: ApplicationFiled: June 29, 2015Publication date: December 31, 2015Applicant: FUJIFILM CORPORATIONInventors: Norihito KASADA, Masahito OYANAGI, Toshio TADA
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Publication number: 20150123026Abstract: Provided is magnetic powder capable of enhancing simultaneously both magnetic characteristics including SNP and durability of a magnetic recording medium. The hexagonal ferrite magnetic powder for a magnetic recording medium has a Ba/Fe molar ratio of 8.0% or more, a Bi/Fe molar ratio of 2.5% or more and an Al/Fe molar ratio of from 3.0 to 6.0%. The magnetic powder preferably has an activation volume Vact of from 1,400 to 1,800 nm3. The magnetic powder particularly preferably has a coercive force Hc of from 159 to 279 kA/m (which is approximately from 2,000 to 3,500 Oe) and a coercivity distribution SFD of from 0.3 to 1.0. The magnetic powder may contain, as an element that substitutes an Fe site of the hexagonal ferrite, at least one kind selected from divalent transition metals M1 and tetravalent transition metals M2.Type: ApplicationFiled: October 31, 2014Publication date: May 7, 2015Inventors: Kenji MASADA, Hirohisa OMOTO, Futoshi NAGASHIMA, Daisuke ABE, Toshio TADA, Norihito KASADA