Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5575973 | High strength high toughness spring steel, and manufacturing process therefor | Hae-Chang Choi, Won-Jun Nam, Jong-Kyo Choi, Jong-Han Choi, Jang Gyun KIM | 1996-11-19 |