Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5296882 | Overhead projector with catadioptric fresnel lens | John C. Nelson, Dennis F. Vanderwerf | 1994-03-22 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5296882 | Overhead projector with catadioptric fresnel lens | John C. Nelson, Dennis F. Vanderwerf | 1994-03-22 |