Assignee
EXPLORATION LOGGING INC
US18 patents
Top patents by PatentIndex Score
US4550392AOct 29, 1985
Apparatus for well logging telemetry
EXPLORATION LOGGING INC66 citations95
US4386422AMay 31, 1983
Servo valve for well-logging telemetry
EXPLORATION LOGGING INC86 citations95
US4216536AAug 5, 1980
Transmitting well logging data
EXPLORATION LOGGING INC142 citations95
US4903245AFeb 20, 1990
Downhole vibration monitoring of a drillstring
EXPLORATION LOGGING INC146 citations93
US4699352AOct 13, 1987
Apparatus for well logging telemetry
EXPLORATION LOGGING INC25 citations92
US4494072AJan 15, 1985
Well logging apparatus with replaceable sensor carrying insulating sleeve disposed in rotation restrained position around a drill string
EXPLORATION LOGGING INC48 citations92
US4513403AApr 23, 1985
Data encoding and synchronization for pulse telemetry
EXPLORATION LOGGING INC91 citations91
US4483393ANov 20, 1984
Well logging apparatus and method for making same
EXPLORATION LOGGING INC33 citations89
US4904865AFeb 27, 1990
Externally mounted radioactivity detector for MWD
EXPLORATION LOGGING INC47 citations86
US4642800AFeb 10, 1987
Noise subtraction filter
EXPLORATION LOGGING INC70 citations86
US4511829AApr 16, 1985
Direct current control in inductive loads
EXPLORATION LOGGING INC45 citations86
US4756188AJul 12, 1988
Method and apparatus for compensating for drilling line stretch in determining equipment depth in a well and for measurement of hookload on the traveling block of a drilling rig
EXPLORATION LOGGING INC24 citations82
US4405021ASep 20, 1983
Apparatus for well logging while drilling
EXPLORATION LOGGING INC24 citations81
US4338565AJul 6, 1982
Method and apparatus for measuring the movement of a spiral wound wire rope
EXPLORATION LOGGING INC24 citations79
US4336564AJun 22, 1982
Solenoid control circuit
EXPLORATION LOGGING INC24 citations78
US4356629ANov 2, 1982
Method of making well logging apparatus
EXPLORATION LOGGING INC17 citations73
US4601100AJul 22, 1986
Method for making logging sleeve
EXPLORATION LOGGING INC12 citations71
US4312223AJan 26, 1982
Carrier system for positioning sensors adjacent a wire rope
EXPLORATION LOGGING INC7 citations68