Issued Patents 2011
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8074740 | Method and system for installing cast-in-place concrete piles with a sonic drill and a removable or retrievable drill bit | — | 2011-12-13 |
| 8002502 | Method and system for installing cast-in-place concrete piles with a sonic drill | — | 2011-08-23 |
| 7891440 | Method and system for installing geothermal transfer apparatuses with a sonic drill and a removable or retrievable drill bit | — | 2011-02-22 |