Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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 |