Assignee
ENERTEC
44 patents
Top patents by PatentIndex Score
US4359684ANov 16, 1982
Electronic watt-hour meter
ENERTEC37 citations91
US4310863AJan 12, 1982
Magnetic tape recorders
ENERTEC31 citations89
US4763103AAug 9, 1988
Process and method for wide band transmission, particularly for data transmission over an electricity distribution network
ENERTEC46 citations87
US4494068AJan 15, 1985
Measurement shunt with compensation for induced error voltages
ENERTEC41 citations85
US4251766AFeb 17, 1981
Method and apparatus for determining the direction of a fault on a power transmission line
ENERTEC45 citations84
US4626772ADec 2, 1986
Process and device for determining a parameter associated with a faulty electric conductor, using a composite monitoring signal
ENERTEC32 citations81
US6796813B1Sep 28, 2004
Data storage or recording device and process for hermetically connecting a data recording and storage cartridge and receptacle
ENERTEC23 citations80
US4595988AJun 17, 1986
Electronic meter for measuring active and reactive energies in a three-phase network
ENERTEC21 citations75
US4224869ASep 30, 1980
Parallel line printer
ENERTEC15 citations74
US4366474ADec 28, 1982
Identification of electric power network phases experiencing disturbances
ENERTEC14 citations73
US4361766ANov 30, 1982
Remotely-controllable relays
ENERTEC23 citations73
US4242634ADec 30, 1980
Electronic multiplying circuits
ENERTEC11 citations73
US4500973AFeb 19, 1985
Electronic devices
ENERTEC14 citations72
US4232298ANov 4, 1980
Remotely-controllable relays and filters therefor
ENERTEC10 citations72
US4568872AFeb 4, 1986
Method of measuring the distance of a fault on a line taking account of distributed capacitances
ENERTEC16 citations71
US4560922ADec 24, 1985
Method for determining the direction of the origin of a disturbance affecting an element of an electrical energy transfer network
ENERTEC17 citations71
US4709280ANov 24, 1987
Apparatus for varying the path of magnetic tape passing over a rotary tape head
ENERTEC15 citations70
US4833414AMay 23, 1989
Method and apparatus for the identification of a faulty conductor in a multiple supply line
ENERTEC13 citations69
US4327390AApr 27, 1982
Capacitive voltage transformers with electronic output
ENERTEC25 citations69
US4325098AApr 13, 1982
Detection of the position of a fault on an electric link
ENERTEC11 citations69
US4739279AApr 19, 1988
Method and a device for rapid adjustment of the phase of a clock signal in rapid phase
ENERTEC13 citations68
US4785168ANov 15, 1988
Device for detecting and localizing neutral particles, and application thereof
ENERTEC9 citations67
US4737800AApr 12, 1988
Electrical supply for a thermal printing head
ENERTEC12 citations65
US4431146AFeb 14, 1984
Tape entrainment device with a movable entrainment roller
ENERTEC8 citations64
US4624399ANov 25, 1986
Gripping drive for magnetic tape
ENERTEC2 citations62
US4571655AFeb 18, 1986
Magnetic cassette with floating and auxiliary tensioning rollers
ENERTEC2 citations62
US4488690ADec 18, 1984
Cassette with controlled-speed elastic belt
ENERTEC3 citations62
US4409545AOct 11, 1983
Electronic measuring device for a polyphase network, in particular for the measurement of power
ENERTEC4 citations60
US4329638AMay 11, 1982
Capacitive voltage transformers
ENERTEC15 citations60
US4710828ADec 1, 1987
Tracking alignment for a rotating magnetic transducer head
ENERTEC10 citations59
US4389683AJun 21, 1983
Switch-tuned filters
ENERTEC4 citations59
US4363041ADec 7, 1982
Dual capstan tape transport having controlled tape tension
ENERTEC4 citations59
US4723113AFeb 2, 1988
Very high frequency harmonic generator
ENERTEC7 citations58
US4378533AMar 29, 1983
Modulator for injecting signals into a polyphase power transmission system
ENERTEC4 citations58
US4335336AJun 15, 1982
Device for controlling speed
ENERTEC8 citations58
US4797846AJan 10, 1989
Digital resonant filter
ENERTEC5 citations56
US4796225AJan 3, 1989
Programmable dynamic shift register with variable shift control
ENERTEC5 citations56
US4327392AApr 27, 1982
Protective apparatus for use with power lines
ENERTEC2 citations54
US4852026AJul 25, 1989
Method and apparatus for the evaluation of an angle over an extended range
ENERTEC1 citations50
US4507624AMar 26, 1985
Voltage-to-frequency converters
ENERTEC1 citations50
US4737872AApr 12, 1988
High density electrical connector for use with rotating head magnetic recording apparatus
ENERTEC1 citations48
US4868774ASep 19, 1989
Digital waveform generator and associated method
ENERTEC6 citations46
US4780908AOct 25, 1988
Method and apparatus for signal transmission regulation in differential protection
ENERTEC2 citations45
US6091588AJul 18, 2000
Magnetic tape recorder having a capacitive coupling device in the form of fixed and mobile rings or ring segments
ENERTEC1 citations33