Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5657527 | Methods for making light-weight drainage line units | Randall J. Houck, Michael Houck | 1997-08-19 |
| 5639364 | Light-weight drainage line units | Randall J. Houck, Michael Houck | 1997-06-17 |
| 5535499 | Methods for making light-weight drainage line units | Randall J. Houck, Michael Houck | 1996-07-16 |
| 5378357 | Light-weight drainage line unit employing end-to-end connectors | Randall J. Houck, Michael Houck | 1995-01-03 |
| 5154543 | Method and apparatus for installation of drainage field | Randall J. Houck, Michael Houck | 1992-10-13 |
| 5051028 | Method and apparatus for installation of drainage field | Randall J. Houck, Michael Houck | 1991-09-24 |
| 5015123 | Method and apparatus for installation of drainage field | Randall J. Houck, Michael Houck | 1991-05-14 |