Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6640910 | Long gauge roller vane drilling motor | — | 2003-11-04 |
| 6561777 | Downhole roller vane motor and roller vane pump | — | 2003-05-13 |
| 6302666 | Downhole roller vane motor | — | 2001-10-16 |
| 5733113 | Downhole roller vane motor and roller vane pump | — | 1998-03-31 |
| 5287926 | Method and system for underground gasification of coal or browncoal | — | 1994-02-22 |
| 4808029 | System for subterranean storage of energy | — | 1989-02-28 |
| 4502539 | Method for the underground gasification of coal or browncoal | — | 1985-03-05 |
| 4441554 | Method for the underground gasification of coal or browncoal | — | 1984-04-10 |
| 4243101 | Coal gasification method | — | 1981-01-06 |
| 4191266 | Process and installation for drilling holes in the earth's crust under freezing conditions | Wouter Van Eek, deceased | 1980-03-04 |