Patents Examined by Linda N. Chau
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Patent number: 11610604Abstract: A magnetic recording medium is a magnetic recording medium in the form of a tape and includes a substrate, a foundation layer provided on the substrate, and a magnetic layer provided on the foundation layer and containing a magnetic powder. The foundation layer and the magnetic layer each contain a lubricant. A squareness ratio of the magnetic layer in a perpendicular direction is equal to or higher than 65%, an average thickness of the magnetic recording medium is equal to or smaller than 5.6 ?m, a plurality of recessed portions each having a depth corresponding to 20% or higher of the average thickness of the magnetic layer is provided on a surface of the magnetic layer, and the number of the recessed portions per unit area of 1,600 ?m2 of the surface of the magnetic layer is equal to or greater than 20 and equal to or smaller than 200, and an amount of exudation of the lubricant per unit region of 12.5 ?m×9.3 ?m on the surface of the magnetic layer in a vacuum is equal to or greater than 3.Type: GrantFiled: October 2, 2019Date of Patent: March 21, 2023Assignee: Sony Group CorporationInventors: Minoru Yamaga, Futoshi Sasaki
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Patent number: 11574651Abstract: A magnetic recording medium, which is used in a recording and playback device in which the shortest recording wavelength is 75 nm or less, in which the magnetic recording medium has a recording layer including powder of ?-iron oxide-containing particles, the average particle size of the particles is 22 nm or less, the coercive force He is 220 kA/m or more and 320 kA/m or less, and the non linear transition shift is 20% or less.Type: GrantFiled: December 28, 2017Date of Patent: February 7, 2023Assignee: Sony CorporationInventors: Masaru Terakawa, Yoichi Kanemaki, Minoru Yamaga
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Patent number: 11545287Abstract: A dust core including a metal magnetic powder and a resin, in which the metal magnetic powder shows a particle diameter of more than 0 ?m and 200 ?m or less, a number percentage of 5.0% or more of metal magnetic particles among the metal magnetic particles composing the metal magnetic powder are at least partially surface-coated with an inorganic compound including an alkaline earth metal, in a coating part coating the metal magnetic particles, an amount of the alkaline earth metal is 10.0 mass % or more, when a total amount of a metal element included in the coating part is 100 mass %, is provide. The dust core is superior in a corrosion-resistance.Type: GrantFiled: September 1, 2017Date of Patent: January 3, 2023Assignee: TDK CORPORATIONInventors: Ryoma Nakazawa, Yousuke Futamata, Takeshi Takahashi
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Patent number: 11527337Abstract: The invention relates to a crosslinkable polymer composition comprising (a) a polyolefin bearing hydrolysable silane groups and a silanol condensation catalyst compound, as well as to an article, preferably a cable, thereof. Also the use of the silanol condensation catalyst compound for crosslinking an article, preferably a layer of a cable is provided.Type: GrantFiled: August 24, 2012Date of Patent: December 13, 2022Assignee: BOREALIS AGInventor: Kristian Dahlen
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Patent number: 11521650Abstract: A magnetic recording medium includes a layer structure including a magnetic layer, a base layer, and a back layer in this order, in which an average thickness tT is tT?5.5 ?m, a dimensional variation ?w in a width direction to tension change in a longitudinal direction is 660 ppm/N??w, and a surface roughness Rabe of the base layer on a side of the back layer is 4.2 nm?Rabe?8.5 nm.Type: GrantFiled: May 24, 2021Date of Patent: December 6, 2022Assignee: Sony CorporationInventors: Minoru Yamaga, Noboru Sekiguchi
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Patent number: 11521648Abstract: A heat-assisted magnetic recording (HAMR) medium has a multilayered underlayer between the heat-sink layer and the recording layer. One embodiment of the underlayer is a multilayer of a thermal barrier layer consisting essentially of MgO and TiO, and a seed layer containing MgO and nitrogen (N) directly on the thermal barrier layer, with the recording layer on and in contact with the seed layer. The interface between the thermal barrier layer and the seed layer contains Ti and N, some of which may be present as TiN to act as a diffusion barrier to prevent diffusion of the Ti into the recording layer. The Ti-containing thermal barrier layer has a higher thermal resistivity than the conventional MgO thermal barrier/seed layer and thus allows for reduced laser power to the recording layer while still achieving a high thermal gradient at the recording layer.Type: GrantFiled: February 9, 2021Date of Patent: December 6, 2022Assignee: Western Digital Technologies, Inc.Inventors: Hoan Cong Ho, Paul Christopher Dorsey, Tomoko Seki
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Patent number: 11514944Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.Type: GrantFiled: March 22, 2019Date of Patent: November 29, 2022Assignee: FUJIFILM CorporationInventor: Norihito Kasada
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Patent number: 11514943Abstract: The magnetic tape includes a non-magnetic support; a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 ?m, the magnetic layer has a servo pattern, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.Type: GrantFiled: March 22, 2019Date of Patent: November 29, 2022Assignee: FUJIFILM CorporationInventor: Norihito Kasada
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Patent number: 11514940Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which a difference (S0.5?S13.5) between a spacing S0.5 measured by optical interferometry regarding a surface of the magnetic layer under a pressing force of 0.5 atm after n-hexane cleaning and a spacing S13.5 measured by optical interferometry regarding the surface of the magnetic layer under a pressing force of 13.5 atm after n-hexane cleaning is equal to or smaller than 3.0 nm, and a magnetic recording and reproducing device including this magnetic recording medium.Type: GrantFiled: September 12, 2019Date of Patent: November 29, 2022Assignee: FUJIFILM CorporationInventors: Naoki Sano, Takuto Kurokawa, Norihito Kasada, Eiki Ozawa
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Patent number: 11508406Abstract: Provided are a magnetic recording medium including: a non-magnetic support; and a magnetic layer which is provided on at least one surface of the non-magnetic support and includes particles of epsilon type iron oxide-based compound, and a binding agent, in which a contact angle measured regarding a surface of the magnetic layer is equal to or greater than 30.0° and smaller than 45.0° with respect to 1-bromonaphthalene and 80.0° to 95.0° with respect to water, a manufacturing method of particles of an epsilon iron oxide-based compound, and a manufacturing method of a magnetic recording medium.Type: GrantFiled: January 28, 2019Date of Patent: November 22, 2022Assignee: FUJIFILM CORPORATIONInventor: Takashi Fujimoto
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Patent number: 11501798Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which the ferromagnetic powder is a ferromagnetic powder selected from the group consisting of a hexagonal strontium ferrite powder and an ?-iron oxide powder, the number of recesses having a depth which is ? or more of a minimum recording bit length existing on a surface of the magnetic layer is less than 10/10,000 ?m2, and a ratio d/tmag of a value d which is ? of the minimum recording bit length to a thickness tmag of the magnetic layer is 0.15 to 0.50.Type: GrantFiled: March 26, 2020Date of Patent: November 15, 2022Assignee: FUJIFILM CorporationInventor: Noriko Imaoka
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Patent number: 11488627Abstract: Provided is a ferromagnetic powder for magnetic recording, in which an activation volume is 800 nm3 to 1,500 nm3, an average plate ratio is 2.0 to 5.0, a rare earth atom content is 0.5 atom % to 5.0 atom %, and an aluminum atom content is greater than 10.0 atom % and equal to or smaller than 20.0 atom %, with respect to 100 atom % of iron atom, and the ferromagnetic powder is a plate-shaped hexagonal strontium ferrite powder having a rare earth atom surface layer portion uneven distribution and an aluminum atom surface layer portion uneven distribution, and a magnetic recording medium including this ferromagnetic powder for magnetic recording in a magnetic layer.Type: GrantFiled: March 19, 2019Date of Patent: November 1, 2022Assignee: FUJIFILM CorporationInventors: Kenji Naoi, Masashi Shirata
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Patent number: 11488628Abstract: The magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.Type: GrantFiled: July 26, 2019Date of Patent: November 1, 2022Assignee: FUJIFILM CorporationInventor: Norihito Kasada
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Patent number: 11450344Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder, in which the ferromagnetic powder is an ?-iron oxide powder having an average particle size of 9.0 nm to 20.0 nm, and in the ?-iron oxide powder, a content of particles having a particle size smaller than 8.0 nm is less than 20.0% by mass, a content of particles having a particle size smaller than 6.0 nm is less than 5.0% by mass, and a content of particles having a particle size greater than 25.0 nm is less than 20.0% by mass.Type: GrantFiled: August 6, 2020Date of Patent: September 20, 2022Assignee: FUJIFILM CorporationInventors: Kenji Naoi, Koichi Yagishita
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Patent number: 11441262Abstract: According to the present invention, there is provided, at low cost, a thread/yarn for making it possible to easily determine whether a product is a genuine product or a forgery/imitation product, thereby suppressing the manufacture and marketing of forgery/imitation products. This forgery-preventing thread/yarn is formed by making use of a film comprising abase sheet and letters or images printed on the base sheet, the film being slit to have a width of 0.15 mm˜0.75 mm. A thread, yarn or a flat thread representing a genuine product can be cheaply manufactured since it can be obtained by simply slitting a film to a width of 0.15 mm˜0.75 mm. Further, it is possible to easily determine whether a product is a genuine product or a forgery/imitation.Type: GrantFiled: October 29, 2015Date of Patent: September 13, 2022Assignee: NAKAGAWA SANGYO CO., LTD.Inventors: Yoshikatsu Nakagawa, Naoki Ikegami
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Patent number: 11430478Abstract: Provided are a magnetic tape including: a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or greater than 4.5, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.Type: GrantFiled: December 26, 2019Date of Patent: August 30, 2022Assignee: FUJIFILM CorporationInventor: Norihito Kasada
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Patent number: 11430477Abstract: A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ?-Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.Type: GrantFiled: July 31, 2020Date of Patent: August 30, 2022Assignee: Sony CorporationInventors: Masaru Terakawa, Yoichi Kanemaki, Minoru Yamaga
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Patent number: 11423936Abstract: There is provided a magnetic recording medium including a base; a seed layer; a foundation layer; and a recording layer, the seed layer being disposed between the base and the foundation layer, having an amorphous state, including an alloy containing Ti, Cr and O, a percentage of Ti being 30 atomic % to 100 atomic % based on a total amount of Ti and Cr contained in the seed layer, and a percentage of O being 15 atomic % or less based on a total amount of Ti, Cr and O contained in the seed layer. Also, a production method thereof is provided.Type: GrantFiled: May 9, 2014Date of Patent: August 23, 2022Assignee: Sony CorporationInventors: Junichi Tachibana, Jota Ito, Tomoe Ozaki, Ryoichi Hiratsuka, Noboru Sekiguchi, Tetsuo Endo
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Patent number: 11423934Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which the ferromagnetic powder is ferromagnetic powder selected from the group consisting of hexagonal strontium ferrite powder and ?-iron oxide powder, and an amount of an edge weave of a tape edge on at least one side of the magnetic tape is 1.5 ?m or less.Type: GrantFiled: March 26, 2020Date of Patent: August 23, 2022Assignee: FUJIFILM CorporationInventor: Norihito Kasada
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Patent number: 11410696Abstract: In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.Type: GrantFiled: January 21, 2021Date of Patent: August 9, 2022Assignee: FUJIFILM CorporationInventor: Norihito Kasada