Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853138 | C-branched zwitterionic surfactants and enhanced oil recovery method using same | Roseann M. Cyngier | 1989-08-01 |
| 4836283 | Divalent ion tolerant aromatic sulfonates | Arthur J. Cooper, Gerald P. Coffey | 1989-06-06 |