Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11602884 | Pipe-forming apparatus for spiral pipe and pipe-forming method thereof | Hiroshi Sugahara, Naoya Tsuda, Masahiro Yamasaki | 2023-03-14 |
| 11473714 | Strip member for spiral pipe and rehabilitation method of existing pipe | Yuuta Miyatake, Hiroshi Sugahara, Yoshirou Sugiyama | 2022-10-18 |
| 11383427 | Pipe-forming apparatus for spiral pipe and pipe-forming method thereof | Hiroshi Sugahara, Naoya Tsuda, Masahiro Yamasaki | 2022-07-12 |
| 11148352 | Pipe-forming apparatus for spiral pipe and pipe-forming method thereof | Hiroshi Sugahara, Naoya Tsuda, Masahiro Yamasaki | 2021-10-19 |
| 11015757 | Pipe-making apparatus and pipe-making method | Hiroshi Sugahara, Masahiro Yamasaki, Yoshirou Sugiyama | 2021-05-25 |
| 10920918 | Pipe-making apparatus and pipe-making method for spiral pipe | Hiroshi Sugahara, Yoshirou Sugiyama, Masahiro Yamasaki, Junichi Nagatsuka | 2021-02-16 |
| 10744702 | Apparatus for forming curls | Keita Kuse, Jun Tsuda, Akihiko Takaya | 2020-08-18 |
| 10119644 | Winding machine | Keita Kuse, Jun Tsuda | 2018-11-06 |