Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4357231 | Method for extracting hydrocarbons from oil shale | John H. Estes | 1982-11-02 |
| 4250016 | Recovery of bitumen from tar sand | John H. Estes | 1981-02-10 |
| 4223731 | Method for enhanced recovery of petroleum | John H. Estes | 1980-09-23 |
| 4222439 | Enhanced recovery of petroleum | John H. Estes | 1980-09-16 |