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Patent applications and USPTO patent grants for Evans; Robert T..The latest application filed is for "enhanced communication services and apparatus".
Patent | Date |
---|---|
Enhanced communication services and apparatus Grant 4,924,495 - Richards , et al. May 8, 1 | 1990-05-08 |
Annulus pressure operated ratchet device Grant 4,696,344 - Scott , et al. September 29, 1 | 1987-09-29 |
Hydraulically set and released bridge plug Grant 4,646,829 - Barrington , et al. March 3, 1 | 1987-03-03 |
Retrievable straddle packer Grant 4,590,995 - Evans May 27, 1 | 1986-05-27 |
Fiber optic connector Grant 4,405,201 - Cefarelli , et al. September 20, 1 | 1983-09-20 |
Multi-fiber optic connector Grant 4,312,564 - Cefarelli , et al. January 26, 1 | 1982-01-26 |
Access valve for drill stem testing Grant 4,278,130 - Evans , et al. July 14, 1 | 1981-07-14 |
Reclosable circulation valve for use in oil well testing Grant 4,113,012 - Evans , et al. September 12, 1 | 1978-09-12 |
Shielded connector Grant 3,958,851 - Evans May 25, 1 | 1976-05-25 |
Down-hole pump and inflatable packer apparatus Grant 3,926,254 - Evans , et al. December 16, 1 | 1975-12-16 |
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