Issued Patents All Time
Showing 51–73 of 73 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4785028 | Gels for profile control in enhanced oil recovery under harsh conditions | Dennis H. Hoskin, Paul Shu | 1988-11-15 |
| 4776398 | Oil reservoir permeability control | A. S. Chu, Harold S. Chung, Dennis H. Hoskin, Paul Shu | 1988-10-11 |
| 4735265 | Method of enhanced oil recovery from subterranean formations | Dennis H. Hoskin | 1988-04-05 |
| 4698149 | Enhanced recovery of hydrocarbonaceous fluids oil shale | — | 1987-10-06 |
| 4676316 | Method and composition for oil recovery by gas flooding | — | 1987-06-30 |
| 4623264 | Temperature sensing using ultrasonic system and movable target | — | 1986-11-18 |
| 4544134 | Tool for torsion bar removal | — | 1985-10-01 |
| 4518480 | Process for the efficient utilization of solvent modified oil shales | Costandi A. Audeh | 1985-05-21 |
| 4482752 | Organic compound conversion | Darrell D. Whitehurst | 1984-11-13 |
| 4452688 | Integrated coal liquefication process | Darrell D. Whitehurst | 1984-06-05 |
| 4424113 | Processing of tar sands | — | 1984-01-03 |
| 4400561 | Catalytic conversion | Darrell D. Whitehurst | 1983-08-23 |
| 4393255 | Catalytic conversion | Darrell D. Whitehurst | 1983-07-12 |
| 4374725 | Process for coal liquefaction | Darrell D. Whitehurst, Malvina Farcasiu | 1983-02-22 |
| 4347116 | Two-stage coal liquefaction | Darrell D. Whitehurst, Malvina Farcasiu | 1982-08-31 |
| 4344838 | Coal conversion catalysts | — | 1982-08-17 |
| 4329221 | Upgrading of hydrocarbon feedstock | Malvina Farcasiu, Darrell D. Whitehurst | 1982-05-11 |
| 4303497 | Desulfurization, demetalation and denitrogenation of coal | Darrell D. Whitehurst, Malvina Farcasiu | 1981-12-01 |
| 4295954 | Coal conversion catalysts | — | 1981-10-20 |
| 4292168 | Upgrading heavy oils by non-catalytic treatment with hydrogen and hydrogen transfer solvent | Francis J. Derbyshire, Darrell D. Whitehurst | 1981-09-29 |
| 4257869 | Liquefaction of acid treated coal | Joseph J. Dickert, Jr., Darrell D. Whitehurst | 1981-03-24 |
| 4218571 | Olefin hydrogenation over synthetic amorphous silica | Darrell D. Whitehurst | 1980-08-19 |
| 4213921 | Olefin hydroformylation | Darrell D. Whitehurst | 1980-07-22 |