Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4182580 | Underdrainage pipe | Shozo Hieda, Minoru Inaba | 1980-01-08 |
| 4182581 | Pipe for underdraining | Minoru Inaba, Noriyuki Ishii, Yoshihisa Kusumi | 1980-01-08 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4182580 | Underdrainage pipe | Shozo Hieda, Minoru Inaba | 1980-01-08 |
| 4182581 | Pipe for underdraining | Minoru Inaba, Noriyuki Ishii, Yoshihisa Kusumi | 1980-01-08 |