Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4572612 | Photographic objective with a fastening device | Willi Wiessner | 1986-02-25 |
| 4548471 | Adjusting device for lenses | Herbert Mulch | 1985-10-22 |
| 4504134 | Photographic objective with automatic diaphragm | Werner Wiessner | 1985-03-12 |
| 4199248 | Selective coupling system for cameras | Willi Wiessner | 1980-04-22 |
| 4181419 | Interchangeable lens for SLR-cameras having TTL light metering | Willi Wiessner | 1980-01-01 |