Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4873994 | Device for determining the forces in the area of the contact surfaces between a spectacle frame and the head of the wearer | Christoph Leuzinger | 1989-10-17 |
| 4820034 | Temple end piece for a temple of a spectacle frame | — | 1989-04-11 |
| 4804260 | Temple for eyeglasses | — | 1989-02-14 |