Issued Patents 2005
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6913266 | Sealing device | Egbert Helmig, Burkhard Helmig | 2005-07-05 |
| 6840315 | Device for cleaning an inner pipe inserted into a gas or oil producing well | Egbert Helmig | 2005-01-11 |