Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4830686 | Low yield ratio high-strength annealed steel sheet having good ductility and resistance to secondary cold-work embrittlement | Koichi Hashiguchi, Toshio Irie, Isao Takahashi | 1989-05-16 |