Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861390 | Method of manufacturing formable as-rolled thin steel sheets | Susumu Satoh, Saiji Matsuoka, Takashi Obara, Kozo Tsunoyama | 1989-08-29 |
| 4830686 | Low yield ratio high-strength annealed steel sheet having good ductility and resistance to secondary cold-work embrittlement | Koichi Hashiguchi, Akio Tosaka, Isao Takahashi | 1989-05-16 |