Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6409229 | Plastic pipe and duct joint connections | — | 2002-06-25 |
| 5909904 | Flange joint assemblies | — | 1999-06-08 |
| 5634847 | Fire Retardant reinforced plastic duct system | — | 1997-06-03 |
| 5505497 | Mechanical joint connections for fiberglass reinforced duct sections | John J. Shea | 1996-04-09 |
| 5449320 | Collapsible duct coupling | — | 1995-09-12 |
| 5383994 | Method for making a double wall fire proof duct | — | 1995-01-24 |
| 5298299 | Double wall fire proof duct | — | 1994-03-29 |
| 5202189 | Fire-resistant reinforced plastic material and articles and methods for their manufacture based on resorcinol novolacs | — | 1993-04-13 |