Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4695372 | Conditioning of carbonaceous material prior to physical beneficiation | John A. Ruether | 1987-09-22 |
| 4675101 | Step-wise supercritical extraction of carbonaceous residua | — | 1987-06-23 |