Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4642297 | Optical glass with refractive indexes of 1.60-1.69 and Abbe numbers of at least 54 with particularly low density and particularly good chemical stability | Karl Mennemann | 1987-02-10 |
| 4526874 | Optical light weight glass with a refractive index of >1.70, an Abbe index of >22 and a density of <3.5 G/CM.sup.3 | Ludwig Ross, Volkmar Geiler, Karl Mennemann | 1985-07-02 |