Issued Patents 2002
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6417488 | Internal metal pipe welding apparatus and monitoring system | Hitoshi Hayakawa, Masaki Tsuchiya | 2002-07-09 |
| 6337459 | Multi-layered anti-coking heat resisting metal tube and the method for manufacturing thereof | F. X. Terwijn, Kiyoshi Morii, Yoshihisa Kato, Hitoshi Hayakawa, Naoki Nishimura | 2002-01-08 |