Glass substrate for magnetic disk
US5900296A · kind A · utility
48Cited by
8References
5Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 18, 1996 |
| Grant date | May 4, 1999 |
| Priority date | — |
| Expiry date | Apr 18, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/315
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A glass substrate for magnetic disks, obtained by chemical strengthening treatment of a glass consisting essentially of from 50 to 65 wt % of SiO.sub.2, from 5 to 15 wt % of Al.sub.2 O.sub.3, from 2 to 7 wt % of Na.sub.2 O, from 4 to 9 wt % of K.sub.2 O, from 7 to 14 wt % of Na.sub.2 O+K.sub.2 O, from 12 to 25 wt % of MgO+CaO+SrO+BaO, and from 1 to 6 wt % of ZrO.sub.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.