Issued Patents 2017
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9709196 | Threaded joint for heavy-walled oil country tubular goods | Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Takuya Nagahama +4 more | 2017-07-18 |
| 9657873 | Threaded joint for pipes | Takamasa Kawai, Kazunari Takahashi, Hiroshi Chikatsune, Masaki Yoshikawa, Takuya Nagahama +2 more | 2017-05-23 |