Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9593783 | Aggregate replacement | — | 2017-03-14 |
| 9206574 | Aggregate replacement | — | 2015-12-08 |
| 9139971 | Aggregate replacement | — | 2015-09-22 |
| 7033110 | Drainage support matrix | — | 2006-04-25 |
| 6866447 | Multi-use fluid collection and transport apparatus | — | 2005-03-15 |
| 6802668 | Subterranean drainage system | — | 2004-10-12 |
| 6648550 | Subterranean drainage device | — | 2003-11-18 |
| 5771643 | Concrete slab-wall spacer with water and radon removal features | — | 1998-06-30 |
| 5694723 | Apparatus and method for water drainage and radon removal | — | 1997-12-09 |
| 5474400 | Radon remediation in form-drain apparatus | Christopher Kliefoth | 1995-12-12 |
| 5224799 | Permanently installed building foundation form | — | 1993-07-06 |
| 5120162 | Building foundation form with integral drain | — | 1992-06-09 |