Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4619738 | Apparatus for oil shale retorting | Arthur E. Lewis, Robert L. Braun, Otis Walton | 1986-10-28 |
| 4601811 | Process for oil shale retorting using gravity-driven solids flow and solid-solid heat exchange | Arthur E. Lewis, Robert L. Braun, Otis Walton | 1986-07-22 |
| 4539917 | Combustion heater for oil shale | Otis Walton, Arthur E. Lewis, Robert L. Braun | 1985-09-10 |
| 4481080 | Staged fluidized bed | — | 1984-11-06 |
| 4320994 | Preparation of grout for stabilization of abandoned in-situ oil shale retorts | — | 1982-03-23 |