Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4396491 | Solvent extraction of oil shale or tar sands | Alfred H. Stiller, John T. Sears | 1983-08-02 |
| 4272356 | Coal extraction process | Alfred H. Stiller, John T. Sears | 1981-06-09 |