Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6756111 | Coated hard alloy | Yoshio Okada, Akihiko Ikegaya | 2004-06-29 |
| 6719074 | Insert chip of oil-drilling tricone bit, manufacturing method thereof and oil-drilling tricone bit | Keiichi Tsuda, Nobuyuki Mori | 2004-04-13 |
| 6673439 | Coated diamond, manufacturing method and composite material thereof | Yoshinari Miyamoto | 2004-01-06 |