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| Number | Title | Issue Date |
| 8173283 | Ceramic substrate A ceramic substrate according to one aspect of the invention comprises a main surface wherein a diameter of a first imaginary circle inscribed in a circumference of the main surface is represented by C (m), a thickness of the ceramic substrate is represented by h (m... | 05/08/2012 |
| 8167685 | Method of manufacturing a perpendicular magnetic recording medium, a method of manufacturing a substrate for a perpendicular magnetic recording medium, and a medium and a substrate manufactured by the methods A method of manufacturing a perpendicular magnetic recording medium and a substrate for the medium are disclosed, in which abnormal protrusions on an underlayer made of a Ni—P alloy are automatically eliminated while maintaining a flat surface with high accuracy o... | 05/01/2012 |
| 8168313 | Glass for information recording medium substrate, glass substrate for information recording medium and magnetic disk A glass for an information recording medium substrate, which comprises, as represented by mol % based on the following oxides, from 61 to 72% of SiO2, from 3 to 11% of Al2O3, from 0 to 14.3% of Li2O, from 0 to 22% of Na | 05/01/2012 |
| 8153284 | Method for fabricating a glass substrate, method for fabricating a magnetic disk, and magnetic disk A method for manufacturing a glass substrate which has a uniform and minute pattern of stripes formed on the surface thereof by ultraprecision polishing, and which allows the recording capacity of a magnetic disk to be increased, includes an inspecting step before t... | 04/10/2012 |
| 8141386 | Method for fabricating a glass substrate for an information recording medium, and magnetic disk using the same A method for fabricating a glass substrate containing SiO2 as a main ingredient thereof for an information recording medium which ensures removal of abrasive or foreign mater adhered to the glass substrate without complicating a cleaning step, involves, a... | 03/27/2012 |
| 8124258 | Glass substrate for magnetic disk There is provided a glass substrate for a magnetic disk in which a maximum height of bumps forming a roughness pattern at a period of smaller than 2 μm is 6 nm or lower in an annular area having a width of 30 μm on a main surface on which a magnetic recording area... | 02/28/2012 |
| 8124257 | Substrate for recording medium, and magnetic recording medium using same A substrate for a recording medium suited for thermally assisted recording methods has a disc shape with a center hole and includes a silicon single-crystal supporting member; an SiO2 film formed on the silicon single-crystal supporting member; a main fac... | 02/28/2012 |
| 8119266 | Magnetic recording medium substrate, magnetic recording medium, method for manufacturing magnetic recording medium substrate, and method for manufacturing magnetic recording medium Provided are a magnetic recording medium substrate whereupon a magnetic layer can be regularly formed in a recording area, a magnetic recording medium and a method for manufacturing the magnetic recording medium substrate. A plurality of recording areas wherein the ... | 02/21/2012 |
| 8119267 | Glass substrate for magnetic disk and manufacturing method of the same A glass substrate for a magnetic disk of the invention is a disk-shaped glass substrate for a magnetic disk where the substrate has a main surface and end face and is subjected to chemical reinforcement treatment, and is characterized in that the penetration length ... | 02/21/2012 |
| 8113017 | Method for cleaning a glass substrate, method for fabricating a glass substrate, and magnetic disk using same A method for cleaning a glass substrate which ensures removal of abrasive and other foreign matter without making a cleaning step complicated involves cleaning the glass substrate by scrubbing using two or more types of cleaning liquid having different Si element el... | 02/14/2012 |
| 8113014 | Method of manufacturing glass substrate for recording medium, glass substrate for recording medium, recording medium and holding jig Provided is a method of manufacturing a glass substrate efficiently via prevention of foreign matter adhesion to a glass substrate as to chemical strengthening. Disclosed is a method of manufacturing a glass substrate for a recording medium possessing the step of co... | 02/14/2012 |
| 8109808 | Method of surface-finishing glass substrate for magnetic disks and glass substrate for magnetic disks An inner peripheral edge of a toroidal glass substrate for a magnetic disk is subjected to mechanical polishing in such a manner that the surface roughness is no greater than 9 nm in terms of Rmax. Then, the inner peripheral edge is subjected to chemical polishing t... | 02/07/2012 |
| 8096148 | Method for fabricating a glass substrate, magnetic disk, and method for fabricating the same A method for fabricating a glass substrate containing SiO2 as a main ingredient thereof and having a uniform and minute pattern of stripes formed on the surface thereof by ultraprecision polishing includes a step of inspecting whether or not, at the topmo... | 01/17/2012 |
| 8092280 | Glass substrate for magnetic disk and method for producing the same The present invention relates to a method for producing a glass substrate for a magnetic disk, the method including a step of polishing a main surface of a circular glass plate while supplying a polishing slurry containing a polishing material, in which polishing is... | 01/10/2012 |
| 8092931 | Magnetic disk, method of manufacturing the magnetic disk and method of evaluating the magnetic disk A protection layer containing carbon as a major component is deposited by plasma CVD. The protection layer has film quality such that, when a spectrum is obtained by excluding photoluminescence from a Raman spectrum in a wavenumber band from 900 cm−1 to... | 01/10/2012 |
| 8076014 | Glass for use in substrate for information recording medium, substrate for information recording medium and information recording medium, and their manufacturing method According to one aspect of the present invention, provided is glass for use in substrate for information recording medium, which comprises, denoted as molar percentages, a total of 70 to 85 percent of SiO2 and Al2O3, where SiO2 ... | 12/13/2011 |
| 8039056 | Polymer thin film, patterned substrate, patterned medium for magnetic recording, and method of manufacturing these articles A polymer thin film in which cylindrical phases are distributed in a continuous phase and are oriented in a pass-through-direction of the film includes at least: a first block copolymer including at least a block chain A1, as a component of the continuous pha... | 10/18/2011 |
| 8029952 | Magnetic recording medium, method for manufacturing the same, and magnetic recording/reproducing apparatus There is provided a method for fabricating a magnetic recording medium that provides high throughput, low manufacturing cost, and no degradation in accuracy in pattern size in fine pattern formation. A resist layer is formed on a substrate or cutting work layer. The... | 10/04/2011 |
| 7989099 | Information medium substrate and information medium An information medium substrate is formed as a flat plate and includes a first convex part formed on one surface of the information medium substrate in a region between a rim part of a center hole and an inner circumferential edge of an information region and a seco... | 08/02/2011 |
| 7985494 | Glass substrate for magnetic disk and magnetic disk apparatus A glass substrate for a magnetic disk satisfies Ra1≦0.8 [nm], 0 [nm]≦Ra1−Ra2≦0.2 [nm], Wa1≦0.6 [nm], and 0 [nm]≦Wa2−Wa1≦0.2 [nm]. Ra1 is an average surface roughness of a first annular area between 1 m... | 07/26/2011 |
| 7976967 | Glass substrate for magnetic disk apparatus A main surface of a glass substrate for a magnetic disk is disk-shaped and has a ski jump on an outer peripheral end portion of the main surface opposing a magnetic head slider to be loaded. A rate of change of angles of tangents to a slope of the ski jump in a radi... | 07/12/2011 |
| 7972715 | Glass substrate and thermal-assisted magnetic recording disk A plurality of recording magnetization portions is arranged in a concentric manner around a center of a glass substrate. A plurality of non-magnetization portion having a thermal conductivity lower than that of the recording magnetization portions is formed each bet... | 07/05/2011 |
| 7964298 | Glass for chemical strengthening, substrate for information recording media and information recording media A glass for use in chemical reinforcement for use in a substrate of an information recording medium, having a composition comprising, denoted as mol %: | 06/21/2011 |
| 7964297 | Adhesion layer for thin film magnetic recording medium The invention uses an adhesion layer of an amorphous alloy of aluminum. A first aluminum titanium embodiment of the amorphous adhesion layer preferably contains approximately equal amounts of aluminum and titanium (+/−5 at. %). A second embodiment of the amorphous... | 06/21/2011 |
| 7960045 | Magnetic recording medium and method of manufacturing the same An aspect of the present invention relates to a magnetic recording medium comprising a coating layer on a nonmagnetic support, wherein the coating layer comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferr... | 06/14/2011 |
| 7955723 | Magnetic recording medium substrate and perpendicular magnetic recording medium A perpendicular magnetic recording medium comprising a pair of soft magnetic layers that are laminated via a non-magnetic layer and antiparallel-coupled to each other and that are provided between a non-magnetic substrate and a magnetic recording layer, wherein spik... | 06/07/2011 |
| 7937967 | Method of manufacturing a glass substrate, glass substrate manufactured by the method, and magnetic recording medium using the glass substrate An object of the present invention is to provide a method of manufacturing a glass substrate containing alkali metals. A glass substrate manufactured by the method exhibits excellent performances including durability by virtue of suppressing elution of alkali metals... | 05/10/2011 |
| 7891212 | Magnetic disk glass substrate A magnetic disk glass substrate including compressive stress layers at main surfaces and a tensile stress layer between the compressive stress layers formed by chemical strengthening. When the glass substrate has a thickness of less than 0.5 mm and the tensile stres... | 02/22/2011 |
| 7882709 | Glass substrate for an information recording medium, method for manufacturing a glass substrate for an information recording medium, and an information recording medium Provided are a glass substrate for an information recording medium, which has both high strength and high flatness and can be manufactured at low cost, a method for manufacturing such glass substrate and an information recording medium using such glass substrate. Th... | 02/08/2011 |
| 7879471 | Support for magnetic recording medium, and magnetic recording medium A magnetic recording medium substrate has a polyester film having metallic oxide-containing layers (layers M) formed on both the surfaces, one layer on each surface, the layers M having a thickness of 50 to 200 nm each, characterized in that the magnetic recording m... | 02/01/2011 |
| 7875374 | Substrate for perpendicular magnetic recording media and perpendicular magnetic recording media using same Substrates for perpendicular magnetic recording media, and perpendicular magnetic recording media using such substrates, are disclosed. By setting the substrate inclination angle, or a parameter related to substrate shape relating to this angle, within an appropriat... | 01/25/2011 |
| 7862912 | Perpendicular magnetic recording medium and system with low-curie-temperature multilayer for heat-assisted writing and/or reading A perpendicular magnetic recording medium, usable for either continuous or patterned media, has a recording layer structure (RLS) of first and second perpendicular magnetic layers (PM1, PM2) and an antiferromagnetically coupling (AFC) layer and a ferro... | 01/04/2011 |
| 7857680 | Method for producing glass substrate for magnetic disk, and magnetic disk A method for producing a glass substrate for a magnetic disk by polishing a circular glass plate, which comprises a step of polishing the principal plane of the circular glass plate by using a slurry containing a CeO2 crystal powder, the CeO2 c... | 12/28/2010 |
| 7855002 | Magnetic disk substrate and magnetic recording medium thereof The present invention relates to a magnetic disk substrate, in which an amplitude Wa of a waviness on a surface measured by using an interferometer for a versatile disk at a measuring wave-length of 5.0 mm is within the range of 0.1 nm to 0.5 nm, an average amplitud... | 12/21/2010 |
| 7851076 | Method of fabricating silicon substrate for magnetic recording media, and magnetic recording medium In this invention, etching is not performed in the step of planarizing a polycrystalline Si wafer, but only mechanical grinding is performed for planarization. This is because, since the etching rate is crystal-face dependent, etching of the polycrystalline Si wafer... | 12/14/2010 |
| 7838136 | Glass for information recording media substrate, glass substrate for magnetic disk and magnetic disk To provide a glass for an information recording media substrate, which is excellent in weather resistance. A glass for an information recording media substrate, which comprises, as represented by mol % based on oxide, from 61 to 66% of SiO2, from 1... | 11/23/2010 |
| 7838067 | Method for producing single-sided sputtered magnetic recording disks An information-storage media is provided that includes: (a) a substrate disk 312 having first and second opposing surfaces; (b) a first selected layer 304 on the first surface, the first selected laye... | 11/23/2010 |
| 7803472 | Substrate glass for data storage medium and glass substrate To provide a substrate glass for data storage medium which is excellent in weather resistance even when no additional treatment such as chemical reinforcement treatment is applied and less susceptible to a whitening phenomenon and which has a glass transition temper... | 09/28/2010 |
| 7780504 | Method for manufacturing disk-substrates for magnetic recording media, disk-substrates for magnetic recording media, method for manufacturing magnetic recording media, magnetic recording media, and magnetic recording device A method for manufacturing a magnetic recording medium disk substrate is provided for achieving a magnetic disk having a suitable surface roughness, a high in-plane magnetic anisotropy and a high S/N. The manufacturing method has a texturing process wherein the magn... | 08/24/2010 |
| 7781043 | Disk roll and base material for disk roll The present invention provides a base material for disk rolls which is a platy molded article for obtaining ring-shaped disks for use in a disk roll comprising a rotating shaft and ring-shaped disks fitted thereon by insertion, whereby the peripheral surface of the ... | 08/24/2010 |
