Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4589489 | Process for recovering oil from subterranean formations | Frank-Michael Schnepel | 1986-05-20 |
| 4579175 | Method of reducing water production | Karl-Heinz Grodde | 1986-04-01 |
| 4549813 | Apparatus for mixing a solution | Egon Willmann | 1985-10-29 |
| 4282930 | Process for the recovery of petroleum from subterranean formations | Karl-Heinz Grodde | 1981-08-11 |