Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D333313 | Magnifying glass | Volker Donn, Wilhelm Schmidt | 1993-02-16 |
| 4630901 | Binocular telescope with central control | Erwin Altenheiner, Gunther Schlicht | 1986-12-23 |
| 4523818 | Ocular eyecups for wearers of glasses | Walter Lang | 1985-06-18 |
| RE30665 | Binocular telescope | Erwin Altenheiner, Volker Donn, Walter Jachan, Artur Jung | 1981-07-07 |