Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4491434 | Handheld viewer for transparency film | Charles A. Barr, David E. Van Allen | 1985-01-01 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4491434 | Handheld viewer for transparency film | Charles A. Barr, David E. Van Allen | 1985-01-01 |