Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11549620 | Screw joint for oil well pipe | Takamasa Kawai, Masaki Yoshikawa, Jun Takano, Takuya Nagahama | 2023-01-10 |
| 10900595 | Threaded joint for oil well tubing | Takamasa Kawai, Taro Kanayama, Masaki Yoshikawa, Masateru Ueta, Jun Takano +1 more | 2021-01-26 |
| 10125554 | Threaded joint for oil country tubular goods | Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano +4 more | 2018-11-13 |
| 9982815 | Threaded joint for oil country tubular goods | Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano +4 more | 2018-05-29 |
| 9709196 | Threaded joint for heavy-walled oil country tubular goods | Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Jun Takano +4 more | 2017-07-18 |