| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 03.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
- Silica, Alumina, Na2O, Li2O - K2O (7.2 - 11 %) - Boria (1 - 5 %) - BaO (5.5 - 9 %) - CaO (3.5 - 4.5 %) - MgO (2.1 - 4 %) |
| PATENT PHOTOCOPY | Available on request |
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