High rigidity glass-ceramic substrate for a magnetic information storage medium
US6344423B2 · kind B2 · utility
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24References
8Claims
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Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Feb 5, 2002 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high rigidity glass-ceramic substrate for a magnetic information storage medium has a ratio of Young's modulus to specific gravity within a range from 37 to 63 and comprises Al2O3 within a range from 10% to less than 20%. A predominant crystal phase of the glass-ceramic substrate consists of one or more crystals selected from the group consisting of &bgr;-quartz, &bgr;-quartz solid solution, enstatite, enstatite solid solution, forsterite and forsterite solid solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.