Inventor
RANDERMANN JR ERVIN
US5 patents
Patents
5 patentsUS5058673AOct 22, 1991
Hydraulically set packer useful with independently set straddle packers including an inflate/deflate valve and a hydraulic ratchet associated with the straddle packers
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US5687795ANov 18, 1997
Packer locking apparatus including a time delay apparatus for locking a packer against premature setting when entering a liner in a wellbore
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US4009753AMar 1, 1977
Subsea master valve apparatus
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US5361839ANov 8, 1994
Full bore sampler including inlet and outlet ports flanking an annular sample chamber and parameter sensor and memory apparatus disposed in said sample chamber
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US4100969AJul 18, 1978
Tubing tester valve apparatus
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