Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6016948 | Method of forming pipe spigot ridge | Manabu Kurotobi, Takahiro Tanaka, Tsuneo Suzuki, Yutaro Takahashi | 2000-01-25 |
| 5960835 | Cast iron pipe surface-modified for corrosion prevention and method of modifying the cast iron pipe surface for corrosion prevention | Hiroshi Izaki, Masanori Yoshino, Manabu Kurotobi, Hiroaki Shimizu | 1999-10-05 |
| 5513794 | Method for fixing stopper ring to pipe spigot | Manabu Kurotobi | 1996-05-07 |
| 5346182 | Teeming trough | Manabu Kurotobi | 1994-09-13 |