Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11970654 | Drilling fluid, drilling method, and drilling fluid additive | Ryutaro Mukai | 2024-04-30 |
| 11326433 | Fracturing method and depressurizing device used for same | Hiroshi Asanuma, Noriyoshi Tsuchiya, Tatsuya Kajiwara, Kuniaki Shimada | 2022-05-10 |
| 11230890 | Well drilling bit and well drilling method using the same | Noriyoshi Tuchiya, Kuniaki Shimada | 2022-01-25 |
| 10801299 | Packer | Kuniaki Shimada, Seiki Horimoto | 2020-10-13 |