Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7938597 | Subsurface drainage system and drain structure therefor | — | 2011-05-10 |
| 7815395 | Subsurface drainage system and drain structure therefor | — | 2010-10-19 |
| 7578635 | Subsurface drainage system and method of installing the same | — | 2009-08-25 |
| 7503726 | Subsurface drainage system and drain structure therefor | — | 2009-03-17 |
| 7341401 | Subsurface drainage system and drain structure therefor | — | 2008-03-11 |
| 7290958 | Subsurface drainage system and drain structure therefor | — | 2007-11-06 |
| 7201538 | Subsurface drainage system and drain structure therefor | James Courter | 2007-04-10 |
| 7108454 | Subsurface drainage system and drain structure therefor | — | 2006-09-19 |