Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4451124 | Photographic lens of continuously variable focal length | Erhard Glatzel | 1984-05-29 |
| 4303312 | Photographic objective of continuously variable focal length | — | 1981-12-01 |