Assignee
DEVELCO
US18 patents
Top patents by PatentIndex Score
US4710708ADec 1, 1987
Method and apparatus employing received independent magnetic field components of a transmitted alternating magnetic field for determining location
DEVELCO658 citations99
US3967201AJun 29, 1976
Wireless subterranean signaling method
DEVELCO182 citations99
US5089779AFeb 18, 1992
Method and apparatus for measuring strata resistivity adjacent a borehole
DEVELCO128 citations98
US4908804AMar 13, 1990
Combinatorial coded telemetry in MWD
DEVELCO54 citations96
US4787093ANov 22, 1988
Combinatorial coded telemetry
DEVELCO65 citations96
US4617960AOct 21, 1986
Verification of a surface controlled subsurface actuating device
DEVELCO87 citations95
US5067114ANov 19, 1991
Correlation for combinational coded telemetry
DEVELCO23 citations92
US4823125AApr 18, 1989
Method and apparatus for stabilizing a communication sensor in a borehole
DEVELCO35 citations92
US3956690AMay 11, 1976
Trimmed superconductive magnetic pickup coil circuits
DEVELCO49 citations92
US4587741AMay 13, 1986
Ball inclinometer
DEVELCO40 citations91
US4736791AApr 12, 1988
Subsurface device actuator requiring minimum power
DEVELCO29 citations90
US4646831AMar 3, 1987
Precision connector for well instrumentation
DEVELCO30 citations89
US3965411AJun 22, 1976
Gradient wound trim coil for trimming a primary pickup coil
DEVELCO7 citations73
US4953616ASep 4, 1990
Solenoid actuator and pulse drive
DEVELCO14 citations71
US4878053AOct 31, 1989
Actuation method
DEVELCO9 citations71
US4926188AMay 15, 1990
Gimballed antenna
DEVELCO2 citations62
US4221834ASep 9, 1980
Superconductive magnetic shield and method of making same
DEVELCO5 citations57
US5027129AJun 25, 1991
Gimballed antenna
DEVELCO1 citations52