Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4818351 | Method for the surface treatment of an iron or iron alloy article | Tohru Arai, Yoshihiko Sugimoto, Yukio Ohta, Shigeo Moriyama, Akira Sato | 1989-04-04 |
| 4804445 | Method for the surface treatment of an iron or iron alloy article | Yukio Ohta, Shigeo Moriyama, Akira Sato, Tohru Arai, Yoshihiko Sugimoto | 1989-02-14 |