Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4857117 | Method of manufacturing a cold-rolled steel sheet having a good deep drawability | Kei Sakata, Shinobu Okano | 1989-08-15 |
| 4830686 | Low yield ratio high-strength annealed steel sheet having good ductility and resistance to secondary cold-work embrittlement | Akio Tosaka, Toshio Irie, Isao Takahashi | 1989-05-16 |