| 7727388 |
Septic tank and drainfield products, systems and methods |
— |
2010-06-01 |
| 7264418 |
Modular slotted drain assembly |
— |
2007-09-04 |
| 6277280 |
Septic tank effluent filtering apparatus and method |
— |
2001-08-21 |
| 5657527 |
Methods for making light-weight drainage line units |
Michael Houck, Harold J. Houck |
1997-08-19 |
| 5639364 |
Light-weight drainage line units |
Michael Houck, Harold J. Houck |
1997-06-17 |
| 5535499 |
Methods for making light-weight drainage line units |
Michael Houck, Harold J. Houck |
1996-07-16 |
| 5378357 |
Light-weight drainage line unit employing end-to-end connectors |
Michael Houck, Harold J. Houck |
1995-01-03 |
| 5154543 |
Method and apparatus for installation of drainage field |
Michael Houck, Harold J. Houck |
1992-10-13 |
| 5051028 |
Method and apparatus for installation of drainage field |
Michael Houck, Harold J. Houck |
1991-09-24 |
| 5015123 |
Method and apparatus for installation of drainage field |
Michael Houck, Harold J. Houck |
1991-05-14 |