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