Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7080958 | Vibratory pile driver/extractor with two-stage vibration/tension load suppressor | — | 2006-07-25 |
| 6280117 | Universal drain fitting | Michael B. Obermeyer | 2001-08-28 |
| 5439326 | Apparatus for inserting prefabricated vertical drains into the earth | R. Robert Goughnour | 1995-08-08 |
| 5213449 | Apparatus for inserting wick drains into the earth | — | 1993-05-25 |