Issued Patents All Time
Showing 51–66 of 66 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5368412 | Use of a gelling composition in waste treatment disposal or solar ponds | Everett L. Johnston | 1994-11-29 |
| 5358043 | Gelling compositions useful for oil field applications | — | 1994-10-25 |
| 5326854 | Flocculation process using lactam or vinyl sulfonate polymer | G. Allan Stahl, Henry L. Hsieh | 1994-07-05 |
| 5270382 | Compositions and applications thereof of water-soluble copolymers comprising an ampholytic imidazolium inner salt | Iqbal Ahmed, Henry L. Hsieh, Bharat B. Patel | 1993-12-14 |
| 5186257 | Polymers useful in the recovery and processing of natural resources | Allan Stahl, John Westerman, Henry L. Hsieh, James H. Hedges, Geir Bjornson | 1993-02-16 |
| 5179136 | Gelatin of acrylamide-containing polymers with aminobenzoic acid compounds and water dispersible aldehydes | — | 1993-01-12 |
| 5100931 | Gelation of acrylamide-containing polymers with hydroxyphenylalkanols | G. Allan Stahl | 1992-03-31 |
| 5080809 | Polymers useful in the recovery and processing of natural resources | G. Allan Stahl, I. John Westerman, Henry L. Hsieh, James H. Hedges, Geir Bjornson | 1992-01-14 |
| 5043364 | Gelation of acrylamide-containing polymers with furfuryl alcohol and water dispersible aldehydes | G. Allan Stahl | 1991-08-27 |
| 4994194 | Altering high temperature subterranean formation permeability | — | 1991-02-19 |
| 4951921 | Polymers useful in the recovery and processing of natural resources | G. Allan Stahl, I. John Westerman, Henry L. Hsieh | 1990-08-28 |
| 4934456 | Method for altering high temperature subterranean formation permeability | — | 1990-06-19 |
| 4884636 | Delaying the gelation of water soluble polymers | Naim A. Mumallah | 1989-12-05 |
| 4822842 | Delaying the gelation of water soluble polymers | Naim A. Mumallah | 1989-04-18 |
| 4632185 | Polymerflood process | Duane H. Smith | 1986-12-30 |
| 4586568 | Polymerflood process | James E. Shaw | 1986-05-06 |