| PATENT ASSIGNEE'S COUNTRY | Japan |
| UPDATE | 10.99 |
| PATENT ASSIGNEE | Sumita Optical Glass |
| PATENT CLAIMS |
- Silica (5-50%) - Boria (10-60%) [SiO2 + B2O3 (50-65%)] - MgO (10-25%) - ZnO (< 10%) - ZrO2 (< 4%) - Tb2O3 (2.1-11.3%) - Y2O2 (< 10%) - CeO2 (< 0.2 %) - Bi2O3 (< 1 %) - Sb2O3 (0.02-0.2%) - Li2O (< 15%) |
| PATENT PHOTOCOPY | Available on request |
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