Issued Patents All Time
Showing 1–16 of 16 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11781058 | Process for sand and proppant consolidation | Paul Daniel Berger | 2023-10-10 |
| 10604694 | Process and composition for sand and proppant flowback | Paul Daniel Berger | 2020-03-31 |
| 8714247 | Sulfonated amphoteric surfactants for IOR | Paul Daniel Berger, Susanta Mohapatra | 2014-05-06 |
| 8680313 | Sulfonated amphoteric surfactants | Paul Daniel Berger, Susanta Mohapatra | 2014-03-25 |
| 8389448 | Anionic ether amines and process for using same | Paul Daniel Berger | 2013-03-05 |
| 7998911 | Environmental friendly fracturing and stimulation composition and method of using the same | Paul Daniel Berger | 2011-08-16 |
| 7977284 | Non-estrogenic alkylphenol derivatives | Paul Daniel Berger | 2011-07-12 |
| 7863476 | Multifunctional anionic surfactants | Paul Daniel Berger | 2011-01-04 |
| 7678937 | Polyalkylated arylalkyl sulfonic acids and their salts | Paul Daniel Berger, Guohua Cao, Oliver S Hsu | 2010-03-16 |
| 7629299 | Process for recovering residual oil employing alcohol ether sulfonates | Paul Daniel Berger, Guohua Cao, Oliver Yehung Hsu | 2009-12-08 |
| 7605287 | Polyalkylated arylalkyl sulfonic acids and their salts | Paul Daniel Berger, Guohua Cao, Oliver Yehung Hsu | 2009-10-20 |
| 7556098 | Oil recovery method employing amphoteric surfactants | Paul Daniel Berger | 2009-07-07 |
| 7427588 | Ether sulfonate surfactants and process for making same | Paul Daniel Berger | 2008-09-23 |
| 7373977 | Process for oil recovery employing surfactant gels | Paul Daniel Berger | 2008-05-20 |
| 6736211 | Method of using alkylsulfonated phenol/aldehyde resins as adsorption reducing agents for chemical flooding | Paul Daniel Berger | 2004-05-18 |
| 6043391 | Anionic surfactants based on alkene sulfonic acid | Paul Daniel Berger, Iris K. Hsu | 2000-03-28 |