Issued Patents 1994
Showing 1–2 of 2 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 | Heiji Sugita, Yoshitaka Nitta, Hiroharu Sawada | 1994-04-12 |
| 5286312 | High-strength spring steel | Masataka Shimotsusa, Sinichi Ohnishi, Takahiko Nagamatsu, Takenori Nakayama | 1994-02-15 |