Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6942031 | Lignosulfonate-acrylic acid graft copolymers as sacrificial agents for carbon dioxide foaming agents | John Prieditis, Grover S. Paulett | 2005-09-13 |
| 6186231 | Conformance improvement in hydrocarbon bearing underground strata using lignosulfonate-acrylic acid graft copolymer gels | — | 2001-02-13 |
| 5251698 | Method of using lignosulfonate-acrylic acid graft copolymers as sacrificial agents for surfactant flooding | Grover S. Paulett | 1993-10-12 |
| 5167281 | Dialkylate additives for surfactant sytems | — | 1992-12-01 |
| 5009268 | Method of using a combination lignosulfonate/polyalkylene glycol system as a sacrificial agent for surfactant flooding | — | 1991-04-23 |
| 4869732 | Deoxygenation of aqueous polymer solutions used in enhanced oil recovery processes | — | 1989-09-26 |
| 4627494 | Method of using a lignosulfonate/carbohydrate system as a sacrificial agent for surfactant flooding | — | 1986-12-09 |
| 4344487 | Modified lignosulfonates as additives in oil recovery processes involving chemical recovery agents | — | 1982-08-17 |
| 4343711 | Surfactant fluid suitable for use in waterflood oil recovery method | — | 1982-08-10 |
| 4296812 | Surfacant waterflooding oil recovery method | — | 1981-10-27 |
| 4276933 | Surfactant waterflood method for the recovery of oil | Mohan V. Kudchadker, Lawrence E. Whittington | 1981-07-07 |
| 4269270 | Sulfomethylated lignosulfonates as additives in oil recovery processes involving chemical recovery agents | — | 1981-05-26 |
| 4267886 | Lignosulfonates carboxylated with chloroacetic acid as additives in oil recovery processes involving chemical recovery agents | — | 1981-05-19 |
| 4249606 | Lignosulfonates carboxylated with carbon dioxide as additives in oil recovery processes involving chemical recovery agents | — | 1981-02-10 |
| 4236579 | Modified lignosulfonates as additives in oil recovery processes involving chemical recovery agents | — | 1980-12-02 |
| 4235290 | Lignosulfonates as additives in oil recovery processes involving chemical recovery agents | — | 1980-11-25 |
| 4231427 | Surfactant waterflooding oil recovery method | — | 1980-11-04 |
| 4230183 | Method for treating subterranean, clay-containing earth formations | — | 1980-10-28 |
| 4219082 | Lignosulfonate-formaldehyde condensation products as additives in oil recovery processes involving chemical recovery agents | — | 1980-08-26 |
| 4196777 | Oxidized lignosulfonates as additives in oil recovery processes involving chemical recovery agents | — | 1980-04-08 |
| 4194565 | Surfactant oil recovery method for use in high temperature formations containing water having high salinity and hardness | — | 1980-03-25 |
| 4191253 | Surfactant waterflood oil recovery method | — | 1980-03-04 |