Issued Patents 2021
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11148352 | Pipe-forming apparatus for spiral pipe and pipe-forming method thereof | Hiroshi Sugahara, Tatsurou Baba, Naoya Tsuda | 2021-10-19 |
| 11015757 | Pipe-making apparatus and pipe-making method | Hiroshi Sugahara, Tatsurou Baba, Yoshirou Sugiyama | 2021-05-25 |
| 10920918 | Pipe-making apparatus and pipe-making method for spiral pipe | Hiroshi Sugahara, Tatsurou Baba, Yoshirou Sugiyama, Junichi Nagatsuka | 2021-02-16 |