Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4924950 | Method of drilling a well by utilizing AE/MA measurement | Hiroaki Niitsuma, Katsuto Nakatsuka, Hiroyuki Abe, Ko Sato, Fumihiko Chiba | 1990-05-15 |
| 4739830 | Method of collecting geothermal steam using AE/MA measurement | Hiroaki Niitsuma, Katsuto Nakatsuka, Hideaki Takahashi, Ko Sato, Fumihiko Chiba | 1988-04-26 |