Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5302216 | Method for producing by continuous heat treatments oil-tempered steel wires for springs having high strength and high toughness | Yoshitaka Nitta, Masao Toyama, Hiroharu Sawada | 1994-04-12 |
| 4877462 | Process for producing oil quench hardening and tempering and hard drawn steel wire of shaped section | — | 1989-10-31 |
| 4563222 | High strength bolt and method of producing same | Takehiko Kato | 1986-01-07 |