Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4577000 | Chemically stable stiff backbone polymers as mobility control agents in oil recovery | Catherine S. H. Chen | 1986-03-18 |
| 4539127 | Hydroxyamide acid products and butyrolactone and butyrolactam products | El-Ahmadi I. Heiba | 1985-09-03 |
| 4468335 | Branched alkylpolyethoxypropane sulfonates and their use in enhanced oil recovery | Catherine S. H. Chen | 1984-08-28 |
| 4329286 | Hydroxyamide acid products and butyrolactone and butyrolactam products | El-Ahmadi I. Heiba | 1982-05-11 |
| 4267123 | Method of preparing propane sulfonates | Catherine S. H. Chen, Kirk D. Schmitt | 1981-05-12 |
| 4190588 | Method of preparing a substituted butyrolactone acetic acid | El-Ahmadi I. Heiba | 1980-02-26 |