Issued Patents 2022
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11326433 | Fracturing method and depressurizing device used for same | Hiroshi Asanuma, Shigemi NAGANAWA, Noriyoshi Tsuchiya, Tatsuya Kajiwara | 2022-05-10 |
| 11230890 | Well drilling bit and well drilling method using the same | Shigemi NAGANAWA, Noriyoshi Tuchiya | 2022-01-25 |