Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6752222 | Downhole percussion drills | Hirokazu Karasawa, Tetsuji Ohno, Akinori Ota, Tsutomu Kaneko, Tetsuomi Miyamoto | 2004-06-22 |
| 6711892 | Exhaust gas purifier for internal combustion engines | Yasuki Tamura, Kojiro Okada, Tomohiro Ohashi, Kazuo Koga | 2004-03-30 |
| 6674515 | Light beam cut-off device | — | 2004-01-06 |