Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6325423 | Arrangement with a female pipe adapter, a female pipe adapter, a bottom pan, an opening design, and a mold core | — | 2001-12-04 |
| D382976 | Manhole bottom plate with anchors | — | 1997-08-26 |
| 5401114 | Manhole ventilation insert with duct shut-off device | — | 1995-03-28 |
| 4483643 | Canal bed shell | — | 1984-11-20 |