loadpatents
Patent applications and USPTO patent grants for Watkins; Fred E..The latest application filed is for "method and system for recovering liquids and gas through a well".
Patent | Date |
---|---|
Method and system for recovering liquids and gas through a well Grant 5,257,665 - Watkins November 2, 1 | 1993-11-02 |
Circulating valve for wells Grant 4,360,064 - O'Connor, III , et al. November 23, 1 | 1982-11-23 |
Well locking device Grant 4,254,829 - Watkins March 10, 1 | 1981-03-10 |
High and low tubing pressure actuated well safety valve Grant 4,161,960 - Watkins July 24, 1 | 1979-07-24 |
Well locking device and method Grant 4,161,984 - Watkins July 24, 1 | 1979-07-24 |
Surface control well safety valve Grant 4,160,484 - Watkins July 10, 1 | 1979-07-10 |
Method of and apparatus for measuring bottom hole well pressure Grant 4,159,643 - Watkins July 3, 1 | 1979-07-03 |
Well safety valve Grant 4,077,473 - Watkins March 7, 1 | 1978-03-07 |
Fluid injection valve for wells Grant 3,993,129 - Watkins November 23, 1 | 1976-11-23 |
Well safety valve Grant 3,981,358 - Watkins , et al. September 21, 1 | 1976-09-21 |
Equalizing Means For Well Safety Valves Grant 3,799,204 - Watkins , et al. March 26, 1 | 1974-03-26 |
Lockout For Well Safety Valve Grant 3,786,866 - Tausch , et al. January 22, 1 | 1974-01-22 |
Lockout For Well Safety Valve Grant 3,786,865 - Tausch , et al. January 22, 1 | 1974-01-22 |
Pressurized Chamber Well Safety Valve Grant 3,782,461 - Watkins January 1, 1 | 1974-01-01 |
Pressure Actuated Safety Valve Grant 3,749,119 - Tausch , et al. July 31, 1 | 1973-07-31 |
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