Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11892106 | Threaded connection for steel pipe | Hikari Nakano, Masaaki Sugino | 2024-02-06 |
| 11774014 | Threaded connection for steel pipes | Hikari Nakano, Masaaki Sugino | 2023-10-03 |
| 11753878 | Threaded connection for steel pipe | Masaaki Sugino, Shin Ugai, Hikari Nakano | 2023-09-12 |
| 11624460 | Threaded connection for steel pipe | Masaaki Sugino, Yousuke Oku | 2023-04-11 |
| 11339901 | Threaded connection for steel pipes | Masaaki Sugino | 2022-05-24 |
| 11313181 | Threaded connection for steel pipe | Masaaki Sugino, Yousuke Oku | 2022-04-26 |
| 11300233 | Threaded connection for steel pipe | Masaaki Sugino, Hikari Nakano | 2022-04-12 |
| 11142960 | Threaded connection for oil well | Masaaki Sugino, Takashi Okada | 2021-10-12 |
| 10774598 | Threaded joint for steel pipes | Fumio Ota, Shin Ugai, Suguru Yamaguchi, Masaaki Sugino | 2020-09-15 |
| 10774958 | Threaded joint for steel pipe | Masaaki Sugino, Fumio Ota | 2020-09-15 |
| 10495241 | Threaded joint for steel pipe | Masaaki Sugino, Sadao Douchi | 2019-12-03 |
| 10473241 | Threaded joint for steel pipes | Fumio Ota, Shin Ugai, Masaaki Sugino | 2019-11-12 |