Issued Patents 2004
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6752222 | Downhole percussion drills | Hirokazu Karasawa, Tetsuji Ohno, Akinori Ota, Naoto Yamada, Tetsuomi Miyamoto | 2004-06-22 |
| 6744506 | Depolarizing plate and an optical apparatus using the same | Toshikazu Yamamoto | 2004-06-01 |
| 6678044 | Monochromator and optical spectrum analyzer equipped with the same | — | 2004-01-13 |