Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7771047 | Error-tolerant progressive glass design | Helmut Altheimer, Gregor Esser, Andrea Welk, Leonhard Schmid, Martin Zimmermann +5 more | 2010-08-10 |
| 7673990 | Individual eyeglass lens | Gregor Esser, Helmut Altheimer, Norbert Awrath, Jochen Brosig, Walter Haimerl +4 more | 2010-03-09 |