Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6338557 | Spectacles with magnifying lenses | Gertrud Grendelmeier, Beat Grendelmeier, Felix Grendelmeier | 2002-01-15 |
| 5943114 | Eyeglasses with attachable protective shield | — | 1999-08-24 |