Inventor · disambiguated record
Fred E. Watkins
Also filed as: WATKINS FRED E
13 granted patents·415 citations·filing 1975–1992
94Inventor score
Technology areasE21B
Top patents by PatentIndex Score
13 records- 0182US3981358AWell safety valveCAMCO INC·Filed 1975·Granted Sep 21, 1976·50 cites·7 claims
- 0281US3993129AFluid injection valve for wellsCAMCO INC·Filed 1975·Granted Nov 23, 1976·48 cites·5 claims
- 0380US4077473AWell safety valveCAMCO INC·Filed 1977·Granted Mar 7, 1978·46 cites·2 claims
- 0475US4161984AWell locking device and methodCAMCO INC·Filed 1978·Granted Jul 24, 1979·37 cites·10 claims
- 0575US4160484ASurface control well safety valveCAMCO INC·Filed 1978·Granted Jul 10, 1979·37 cites·9 claims
- 0673US4360064ACirculating valve for wellsEXXON PRODUCTION RESEARCH CO·Filed 1980·Granted Nov 23, 1982·46 cites·10 claims
- 0771US4161960AHigh and low tubing pressure actuated well safety valveCAMCO INC·Filed 1978·Granted Jul 24, 1979·32 cites·4 claims
- 0865US4254829AWell locking deviceCAMCO INC·Filed 1979·Granted Mar 10, 1981·25 cites·4 claims
- 0964US4159643AMethod of and apparatus for measuring bottom hole well pressureCAMCO INC·Filed 1978·Granted Jul 3, 1979·24 cites·12 claims
- 1060US5257665AMethod and system for recovering liquids and gas through a wellCAMCO INT·Filed 1992·Granted Nov 2, 1993·33 cites·10 claims
- 1145US4106563ASidepocket mandrelCAMCO INC·Filed 1977·Granted Aug 15, 1978·16 cites·8 claims
- 1242US4476924AGrease injection control head having a specific gas trapCAMCO INC·Filed 1983·Granted Oct 16, 1984·16 cites·9 claims
- 1333US4415028AApparatus for measuring bottom hole well conditionsCAMCO INC·Filed 1981·Granted Nov 15, 1983·5 cites·3 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →