| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 03.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
- Silica (65 - 73 %) - Alumina (0.5 - 2.5 %) - Na2O (5 - 9 %) - K2O (8 - 12 %) - Li2O (0.4 - 1.5 %) - SrO (0.5 - 5 %) - Boria (2.1 - 5 %) |
| PATENT PHOTOCOPY | Available on request |
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