Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5650247 | Preparation and reproduction of filters and preparation of filter photographic materials | Minoru Utsumi | 1997-07-22 |
| 5635317 | Preparation and reproduction of filters and preparation of filter photographic materials | Minoru Utsumi | 1997-06-03 |