High rigidity glass-ceramic substrate for a magnetic information storage medium
US6245411A · kind A · utility
40Cited by
6References
8Claims
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Key dates
| Filing date | Nov 30, 1998 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Nov 30, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24355
- 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 Al.sub.2 O.sub.3 within a range from 10% to less than 20%. Predominant crystal phases of the glass-ceramic substrate consist of (1) cordierite or cordierite solid solution and (2) one or more crystals selected from the group consisting of Spinel crystal, Spinel crystal solid solution, enstatite, enstatite solid solution, .beta.-quartz and .beta.-quartz solid solution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.