Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4436239 | Method and apparatus for manufacturing spiral pipe | Yoshito Tsuyama, Yasumi Shimazaki, Toshio Hirokawa | 1984-03-13 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4436239 | Method and apparatus for manufacturing spiral pipe | Yoshito Tsuyama, Yasumi Shimazaki, Toshio Hirokawa | 1984-03-13 |