Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6709106 | Method for the manufacture of a spectacle lens, spectacle lens and spectacle lens family | Helmut Wietschorke | 2004-03-23 |
| 5784144 | Multifocal spectacle lens | Hans Lahres, Konrad Saur, Helmut Wietschorke | 1998-07-21 |
| 5444503 | Spectacle lens | Hans Lahres, Helmut Wietschorke | 1995-08-22 |
| 5137343 | Multifocal surface for a multifocal spectacle lens | Hans Lahres, Helmut Wietschorke | 1992-08-11 |