Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7256161 | Process for making group II metal carbonated, overbased Mannich condensation products of alkylphenols | Robert H. Wollenberg | 2007-08-14 |
| 5358045 | Enhanced oil recovery method employing a high temperature brine tolerant foam-forming composition | Willard J. Sevigny, Donald L. Kuehne | 1994-10-25 |
| 5246072 | Method for enhancing the recovery of petroleum from an oil-bearing formation using a mixture including anionic and cationic surfactants | Rawls Frazier, Donald L. Kuehne, Willie Horn, Jr. | 1993-09-21 |