Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7629299 | Process for recovering residual oil employing alcohol ether sulfonates | Paul Daniel Berger, Christie Huimin Berger, Guohua Cao | 2009-12-08 |
| 7605287 | Polyalkylated arylalkyl sulfonic acids and their salts | Paul Daniel Berger, Christie Huimin Berger, Guohua Cao | 2009-10-20 |