Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5882145 | Method for controlling expansion and contraction of trench liners | — | 1999-03-16 |
| 5879106 | Method and apparatus for controlling expansion and contraction of trench lines having lateral extensions | — | 1999-03-09 |
| 5810513 | Method and apparatus for preventing trench overflows behind trench liners | Kimberly B. Olsoni | 1998-09-22 |
| 5735638 | Apparatus for lining a trench | — | 1998-04-07 |
| 5613804 | Holding means for securing a liner to a trench | — | 1997-03-25 |
| 5573351 | Method and apparatus for relining or forming a trench | — | 1996-11-12 |
| 5568995 | Method and apparatus for adding a double liner to a trench | — | 1996-10-29 |
| 5538361 | Apparatus for forming a trench | — | 1996-07-23 |
| 5326190 | Method and apparatus for stabilizing a trench form during construction | — | 1994-07-05 |
| 5326189 | Method and apparatus for forming a trench with grates or solid covers | — | 1994-07-05 |
| 5281052 | Multi-containment trench system | — | 1994-01-25 |
| 5256000 | Apparatus for forming a multi-walled trench | — | 1993-10-26 |
| 5000621 | Apparatus for forming a trench | — | 1991-03-19 |
| 4993877 | Method and apparatus for forming a trench | — | 1991-02-19 |
| 4993878 | Method and apparatus for forming a trench | — | 1991-02-19 |