Issued Patents 2020
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10838231 | Progressive spectacle lens having a variable refractive index and method for the design and production thereof | Gerhard Kelch, Helmut Wietschorke | 2020-11-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10838231 | Progressive spectacle lens having a variable refractive index and method for the design and production thereof | Gerhard Kelch, Helmut Wietschorke | 2020-11-17 |