Issued Patents 2004
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6719074 | Insert chip of oil-drilling tricone bit, manufacturing method thereof and oil-drilling tricone bit | Keiichi Tsuda, Hideki Moriguchi | 2004-04-13 |
| 6684168 | Body displacement and vibration analysis method | Atsushi Kawamoto, Mizuho Inagaki, Takayuki Aoyama, Kimihiko Yasuda | 2004-01-27 |