Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4441749 | Elevator for casing | Josef Roob | 1984-04-10 |
| 4248550 | Pile extraction apparatus | Josef Roob | 1981-02-03 |
| 4202416 | Method and apparatus for sinking a cased borehole for producing cased pile foundations | Josef Roob | 1980-05-13 |
| 4193462 | Rotary boring head | Josef Roob | 1980-03-18 |