Aluminum alloy disc blank for magnetic disc and magnetic disc
US12087342B2 · kind B2 · utility
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8Claims
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Key dates
| Filing date | Jun 22, 2023 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | Jun 22, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/858
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An aluminum alloy disc blank for a magnetic disc made of an aluminum alloy containing Fe: 0.005 to 1.800 mass % with the balance being Al and inevitable impurities, wherein a flatness change of the aluminum alloy disc blank for a magnetic disc when the aluminum alloy disc blank for a magnetic disc is held in the atmosphere at 50° C. or lower for 336 hours is 2.0 μm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.