Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6662644 | Formation fluid sampling and hydraulic testing tool | Josef Grotendorst | 2003-12-16 |
| 5097914 | Method and device for producing unadulterated water samples in drilling a well | — | 1992-03-24 |
| 5054553 | Method of underground-water exploration during well-construction by hydraulic-system drilling | — | 1991-10-08 |