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Patent applications and USPTO patent grants for Dilgren; Richard E..The latest application filed is for "selective steam foam soak oil recovery process".
Patent | Date |
---|---|
Selective steam foam soak oil recovery process Grant 4,532,993 - Dilgren , et al. August 6, 1 | 1985-08-06 |
Olefin sulfonate-improved steam foam drive Grant 4,488,976 - Dilgren , et al. December 18, 1 | 1984-12-18 |
Olefin sulfonate-improved steam foam drive Grant 4,393,937 - Dilgren , et al. July 19, 1 | 1983-07-19 |
Hot water foam oil production process Grant 4,161,217 - Dilgren , et al. July 17, 1 | 1979-07-17 |
Steam-channel-expanding steam foam drive Grant 4,086,964 - Dilgren , et al. May 2, 1 | 1978-05-02 |
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