Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5799703 | Synthetic resin corrugated pipe having a concave-convex surface | Shiro Kanao, by Shigeki Kanao, heir | 1998-09-01 |
| 5769127 | Resin pipe | Shiro Kanao, by Shigeki Kanao, heir | 1998-06-23 |