| 8820800 |
Multi-wall corrugated pipe couplings and methods |
Gerald S. Sutton, William V. Shaffer, John M. Kurdziel, David J. Kelley, Jeffrey J. Biesenberger |
2014-09-02 |
| 8820801 |
Multi-wall corrugated pipe couplings and methods |
Gerald S. Sutton, William V. Shaffer, John M. Kurdziel, David J. Kelley, Jeffrey J. Biesenberger |
2014-09-02 |
| 8733405 |
Corrugated pipe with outer layer |
John M. Kurdziel |
2014-05-27 |
| 7484535 |
Corrugated pipe with outer layer |
John M. Kurdziel |
2009-02-03 |
| 7451784 |
Corrugated pipe with perforation protecting cover |
— |
2008-11-18 |
| 7306264 |
Pipe having a water-tight in-line bell |
William V. Shaffer |
2007-12-11 |
| 6702517 |
Pipe assembly for collecting surface water runoff and associated methods |
— |
2004-03-09 |
| 6644357 |
Corrugated pipe with improved profile stability |
— |
2003-11-11 |
| 6126209 |
Pipe having an in-line bell |
— |
2000-10-03 |
| 5944444 |
Control system for draining, irrigating and heating an athletic field |
Joseph E. Motz, Mark A. Heinlein, Carl Tyner, Craig Reese, Brian L. Ferry |
1999-08-31 |
| 5765598 |
Pipe construction |
Lester Gabriel |
1998-06-16 |
| 5765880 |
Pipe coupler |
— |
1998-06-16 |
| 5752784 |
Low profile drainage network for athletic field drainage system |
Joseph E. Motz, Mark A. Heinlein, Carl Tyner |
1998-05-19 |
| D380813 |
Pipe connector |
Joseph E. Motz, Mark A. Heinlein, Carl Tyner |
1997-07-08 |
| 4904113 |
Highway edgedrain |
Leon H. Zimmerman, Larry L. Martin |
1990-02-27 |