Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4407683 | Steel for cold plastic working | Kazuhiro Kawasaki | 1983-10-04 |
| 4336081 | Process of preparing steel coil spring | Kazuhiro Kawasaki | 1982-06-22 |
| 4222799 | High-strength spring steel and its manufacturing process | Takao Yamazaki, Kiyohiko Fujita | 1980-09-16 |