Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4824809 | Optical CdO and ThO.sub.2 -free glass with refractive indices of 1.73-1.78 abbe numbers of 30-34, and high devitrification stability | Danuta Grabowski | 1989-04-25 |
| 4814299 | Optical glass with refractive index 1.60, an abbe number 58, with high chemical stability and resistance to phase separation and crystallization | Volkmar Geiler | 1989-03-21 |