Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6659687 | Subterranean fluid distribution and drainage system | James M. Donlin | 2003-12-09 |
| 4917536 | Fluid storage system | — | 1990-04-17 |
| 4880333 | Subterranean fluid filtering and drainage system | Ursula E. Laak | 1989-11-14 |
| 4878421 | Radon venting system for existing structures | — | 1989-11-07 |
| 4490072 | Drainage device | — | 1984-12-25 |