Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881093 | Electromagnetic shutter apparatus | — | 1989-11-14 |
| 4821053 | Photographic flash device | Paul L. Ruben | 1989-04-11 |
DD
David R. Dowe
Overall (1989): #29,640 of 140,708Top 25%
2
Patents 1989