Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4595056 | Method for fully retorting an in situ oil shale retort | Raymond L. Zahradnik, Jian Shen | 1986-06-17 |
| 4448249 | Method of in situ oil shale retort ignition with oxygen control | Frederick M. Gragg, Jian Shen | 1984-05-15 |