Inventor

LIBERT JAMES T

US12 patents

Patents

12 patents

US4796142AJan 3, 1989

Overload protection apparatus for emulating the response of a thermal overload

SQUARE D CO97 citations95

US4912390AMar 27, 1990

Apparatus for controlling firing of thyristors relative to a current reaching zero by using a microcomputer and hardware responsive to voltage crossing zero

SQUARE D CO59 citations94

US4647825AMar 3, 1987

Up-to-speed enable for jam under load and phase loss

SQUARE D CO110 citations94

US4887018ADec 12, 1989

Line to line to line to neutral converter

SQUARE D CO39 citations92

US4876468AOct 24, 1989

Thyristor driver turn-off circuit

SQUARE D CO34 citations92

US4710692ADec 1, 1987

Self calibration of the thyristor firing angel of a motor controller using a current window to determine a final value of a reference current lag phase angle

SQUARE D CO44 citations91

US4724503AFeb 9, 1988

Phase unbalance detector

SQUARE D CO20 citations81

US4634951AJan 6, 1987

Reduced voltage starter with voltage ramp control

SQUARE D CO24 citations80

US4802053AJan 31, 1989

Control circuitry including phase failure relay

SQUARE D CO20 citations75

US4344102AAug 10, 1982

Anti-telegraph control circuit for electromagnet coil

SQUARE D CO14 citations71

US4409640AOct 11, 1983

Abort cycle timer

SQUARE D CO3 citations60

US4714977ADec 22, 1987

Electronic delay timer

SQUARE D CO4 citations58