Issued Patents 2002
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6447619 | High surface pressure resistant steel parts and methods of producing same | Naoji Hamasaka | 2002-09-10 |
| 6428744 | Sliding contact material, sliding contact element and producing method | Yoshikiyo Tanaka | 2002-08-06 |
| 6413328 | High surface pressure resistant steel parts and methods of producing same | Naoji Hamasaka | 2002-07-02 |