Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4842776 | Styrylaryloxy ether sulfonates, a process for their preparation and their use in the recovery of crude oil | Manfred Schmidt, Walter Rupp, Gerhart Schneider | 1989-06-27 |