Issued Patents All Time
Showing 1–25 of 41 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4611856 | Two-level, horizontal free face mining system for in situ oil shale retorts | Chang Y. Cha | 1986-09-16 |
| 4560206 | Method for explosively expanding a pillar | — | 1985-12-24 |
| 4560205 | Method for control of geometry of fragmented mass in an situ oil shale retort | — | 1985-12-24 |
| 4533181 | Method for forming uniform flow rubble bed | — | 1985-08-06 |
| 4531783 | Stability control in underground workings adjacent an in situ oil shale retort | — | 1985-07-30 |
| 4513665 | Method for loading explosive charges into blastholes formed in a subterranean formation | John E. Shaler | 1985-04-30 |
| 4489983 | Blasthole spacing for control of particle size | — | 1984-12-25 |
| 4466668 | Method of forming an in situ oil shale retort in formation with joints | — | 1984-08-21 |
| 4458948 | Horizontal free face blasting for minimizing channeling and mounding in situ retort with cusp at intermediate elevation | — | 1984-07-10 |
| 4453769 | In situ oil shale retort having horizontal voids with side pillars | Robert S. Burton, III | 1984-06-12 |
| 4449753 | Method for bulking full a retort | Allan Sass | 1984-05-22 |
| 4444433 | Method for forming an in situ oil shale retort in differing grades of oil shale | — | 1984-04-24 |
| 4443036 | Explosive expansion of formation in lifts for forming an in situ oil shale retort | — | 1984-04-17 |
| 4443037 | Method for controlling void fraction distribution in an in situ oil shale retort | — | 1984-04-17 |
| 4441759 | In situ oil shale retort system | Ned M. Hutchins, Irving G. Studebaker, Rudolf Kvapil | 1984-04-10 |
| 4440447 | Method for forming an in situ oil shale retort with explosive expansion towards a horizontal free face | John E. Shaler | 1984-04-03 |
| 4440444 | Method for controlling void in an in situ oil shale retort | — | 1984-04-03 |
| 4435017 | In situ oil shale retort with differing upper and lower void fractions | — | 1984-03-06 |
| 4423908 | Formation of an in situ oil shale retort with control of mounding | — | 1984-01-03 |
| 4402550 | Method for forming an in situ oil shale retort with controlled seismic vibration | — | 1983-09-06 |
| 4396231 | Horizontal free face blasting for minimizing channeling and mounding | — | 1983-08-02 |
| 4372615 | Method of rubbling oil shale | — | 1983-02-08 |
| 4370003 | Temporary gas seal for gas level drift of an in situ oil shale retort | Rudolph Kvapil | 1983-01-25 |
| 4366987 | Method for forming an in situ oil shale retort with horizontal free faces | Robert J. Fernandes | 1983-01-04 |
| 4360233 | Method of bulking an in situ oil shale retort substantially full of fragmented shale | — | 1982-11-23 |