Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879100 | Corona discharge treatment apparatus | Koichi Tsutsui, Koji Ueki | 1989-11-07 |
| 4867573 | Powder treating method and apparatus used therefor | Koichi Tsutsui, Koji Nishizawa, Makoto Yagi, Nobuaki Kubo | 1989-09-19 |