Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4941967 | Process for re-refining spent lubeoils | Leonardus M. M. Mannetje | 1990-07-17 |
| 4816138 | Process for cleaning of toxic waste materials by refining and/or elimination of biologically difficult to degrade halogen, nitrogen and/or sulfur compounds | Leo Visser | 1989-03-28 |