Issued Patents All Time
Showing 26–50 of 50 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4609708 | Method for manufacture of polymeric pyrrolidinium methanesulfonate viscosifiers | — | 1986-09-02 |
| 4590996 | Use of polyalkoxy sulfonate surfactants for inhibition of scale formation | Dennis H. Hoskin, L. Deane Rollmann, Gerald L. Shoemaker | 1986-05-27 |
| 4582137 | Polymerizable surfactants for permeability control in waterflooding | — | 1986-04-15 |
| 4555489 | Method for determining flow patterns in subterranean petroleum and mineral containing formations using organosulfur tracers | — | 1985-11-26 |
| 4555488 | Method for determining flow patterns in subterranean petroleum and mineral containing formations using organonitrogen tracers | — | 1985-11-26 |
| 4545911 | Polymeric pyrrolidinium methanesulfonate viscosifiers for aqueous fluids | — | 1985-10-08 |
| 4545912 | Two-tailed surfactants having one aromatic containing tail and their use in chemical waterflooding | — | 1985-10-08 |
| 4529522 | Alkyl sulfonates of polyvinyl alcohol as viscosifiers in saline solutions | — | 1985-07-16 |
| 4528383 | Substituted cyclic and heterocyclic methane sulfonates | — | 1985-07-09 |
| 4517128 | Two-tailed surfactants having one aromatic containing tail and their use in chemical waterflooding | — | 1985-05-14 |
| 4504622 | Polymeric pyrrolidinium methanesulfonate viscosifiers and method for manufacture | — | 1985-03-12 |
| 4487702 | Substituted heterocyclic methane sulfonates as sacrificial agents in enhanced oil recovery | — | 1984-12-11 |
| 4487837 | Radiation method for determining brine tolerant surfactants in complex mixtures | — | 1984-12-11 |
| 4485026 | Hard water stability improvers for oil-in-water emulsions hydraulic fluids | Joosup Shim | 1984-11-27 |
| 4469607 | Pyrrolidinium methane sulfonates as surfactants in enhanced oil recovery | — | 1984-09-04 |
| 4458048 | Alkyl sulfonates of polyvinyl alcohol as viscosifiers in saline solutions | — | 1984-07-03 |
| 4458052 | Alkyl sulfonates of polyvinyl alcohol as viscosifiers in saline solutions | — | 1984-07-03 |
| 4442042 | Process of making propane sulfonates | — | 1984-04-10 |
| 4420565 | Method for determining flow patterns in subterranean petroleum and mineral containing formations | — | 1983-12-13 |
| 4370146 | Infrared absorption determination of sulfonate surfactants utilizing deuterated sulfonates | — | 1983-01-25 |
| 4303411 | Fluorine-containing tracers for subterranean petroleum and mineral containing formations | Catherine S. H. Chen, Yuhshi Luh | 1981-12-01 |
| 4267123 | Method of preparing propane sulfonates | Catherine S. H. Chen, Albert L. Williams | 1981-05-12 |
| 4253982 | Lubricant compositions | Robert F. Bridger | 1981-03-03 |
| 4224172 | Oil-soluble adducts of benzotriazole and oxazolines and lubricant compositions containing same | Robert F. Bridger | 1980-09-23 |
| 4198355 | Preparation of tertiary alkylphosphorodichloridite derivatives | — | 1980-04-15 |