Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6319395 | Process and apparatus for converting oil shale or tar sands to oil | James Doyle, Fred Hildebrandt | 2001-11-20 |
| 6139722 | Process and apparatus for converting oil shale or tar sands to oil | James Doyle, Fred Hildebrandt | 2000-10-31 |
| 5902554 | Apparatus for converting oil shale or tar sands to oil | — | 1999-05-11 |
| 5681452 | Process and apparatus for converting oil shale or tar sands to oil | — | 1997-10-28 |
| 4279722 | Use of microwaves in petroleum refinery operations | — | 1981-07-21 |
| 4234402 | Sulfur removal from crude petroleum | — | 1980-11-18 |