Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5697272 | Method of perforating film | Hiroshi Tsuzaki, Junichi Tsuchiya, Susumu Sato | 1997-12-16 |
| 5697273 | Method of perforating film | Hiroshi Tsuzaki, Junichi Tsuchiya, Susumu Sato | 1997-12-16 |