Issued Patents 2019
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10414851 | Rubber member for downhole tools, downhole tool, and method for recovering hydrocarbon resource | Takeo Takahashi | 2019-09-17 |
| 10280699 | Degradable rubber member for downhole tools, degradable seal member, degradable protecting member, downhole tool, and method for well drilling | Takeo Takahashi, Takuma Kobayashi | 2019-05-07 |
| 10208559 | Diameter-expandable annular degradable seal member for downhole tool, plug for well drilling, and method for well drilling | Takeo Takahashi | 2019-02-19 |