Inventor

RENFROE JR JAMES B

US4 patents

Patents

4 patents

US4834176AMay 30, 1989

Well valve

OTIS ENG CO33 citations89

US4646828AMar 3, 1987

Apparatus for enhanced oil recovery

OTIS ENG CO28 citations89

US4632184ADec 30, 1986

Submersible pump safety systems

OTIS ENG CO36 citations87

US4624310ANov 25, 1986

Well apparatus

OTIS ENG CO24 citations78