75780659
Aug 18, 1999
Dec 25, 2001
TEMPERATURE ACTUATED CONTROL DEVICES, NAMELY, CONTROLLERS, INDICATORS, PROBES, TRANSFORMERS, ZERO CROSSOVER FIRING UNITS, AND PROCESS ALARMS FOR CONTROL AND INDICATION OF TEMPERATURE DEPENDENT PROCESSES; THERMOELECTRIC TRANSDUCERS; ELECTRONIC PROCESS CONTROLLERS FOR IN-PROCESS CONTROLLING OF VARIOUS PHYSICAL ENVIRONMENTAL PROCESS VARIABLES INCLUDING PRESSURE, TEMPERATURE, PH, HUMIDITY, POSITION, AC AND/OR DC VOLTAGE, AND AC AND/OR DC CURRENT; ELECTRONIC TEMPERATURE CONTROLS; THERMOSTAT TEMPERATURE CONTROLS FOR IN-PROCESS CONTROLLING OF VARIOUS PHYSICAL ENVIRONMENTAL PROCESS VARIABLES INCLUDING PRESSURE, TEMPERATURE, PH, HUMIDITY, POSITION, AC AND/OR DC VOLTAGE, AND AC AND/OR DC CURRENT; ELECTRONIC TEMPERATURE INDICATORS, NAMELY, ANALOG AND DIGITAL TEMPERATURE DISPLAYS; INFRARED THERMOMETERS FOR NON-MEDICAL USE; THERMOCOUPLE THERMOMETERS FOR NON-MEDICAL USE; TEMPERATURE SENSORS, NAMELY, THERMOCOUPLES AND RESISTANCE TEMPERATURE DETECTOR DEVICES; ELECTRICAL CONTROLLERS FOR CONTROLLING MOTORS, LEVEL CONTROLLERS, POSITION ACTUATORS, DAMPERS, VALVES, ALARMS, TIMING CIRCUITS AND RECORDERS; ELECTRONIC RELAYS AND SWITCHES FOR USE WITH PROCESS CONTROL EQUIPMENT; MERCURY DISPLACEMENT SWITCHES; TRANSMITTERS, NAMELY, PROCESS TRANSMITTERS FOR THE ISOLATION OF INPUT ELECTRICAL SIGNALS FROM THE RETRANSMISSION OF THE ELECTRICAL SIGNALS; TRANSMITTERS FOR THE ISOLATION, DISPLAY AND RETRANSMISSION OF ELECTRICAL SIGNALS; DETECTORS FOR INDICATING WHEN CURRENT IS FLOWING THROUGH A CIRCUIT; ELECTRICAL SIGNAL CONVERTERS; STRIP CHART DATA RECORDERS; CIRCULAR CHART RECORDERS; ELECTRONIC DATA RECORDERS; ELECTRICAL POWER FILTERS, NAMELY, LINE FILTERS; NOISE SUPPRESSORS FOR SUPPRESSING WIDE BAND ELECTRICAL CONDUCTED NOISE; AND PARTS THEREFOR
Electrical and Scientific Apparatus