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4198562 |
Electrically heated bedcover with overheat protective circuit
An electrical heating apparatus such as an electrically heated bedcover protected against an overheating condition by an overheat protective circuit which utilizes a pair of solid state switching...
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4191512 |
Apparatus and method for controlling pressure ratio in high vacuum vapor pumps
A predetermined pressure ratio is maintained between a foreline and a load port of a vacuum diffusion pump including a bath of oil that is vaporized by a heater. A property of the pump is sensed to...
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4170932 |
Electronic toaster control
An electronic control for controlling the degree of toasting of a bread slice in a toaster. The control includes a thermocouple located within the passage of the toaster for the bread slice and...
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4167688 |
Composite illumination fixture and control circuit therefor
A control circuit including at least one switch and a plurality of rectifiers for selectively applying a-c utility power to either or both of two remote electrically-powered apparatus at respective...
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4162379 |
Apparatus for deriving a feedback control signal in a thermal system
Power is applied to an electrical element in maintaining a thermal system at stabilized conditions and a feedback signal is derived to control the electrical input to the heating element by...
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4159876 |
Flameless atomization
Chemical analysis apparatus such as a spectrophotometer including an atomizer for receiving a sample to be analyzed and being heated by resistance heating. Control means being provided to vary the...
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4145599 |
Fixing device of electrophotographic copying machine
The disclosure describes a fixing device for electrophotographic copying machine of the type in which a support carrying thereon a powder image is passed between a pair of rotary members so as to...
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4130853 |
Glow plug temperature circuit
An apparatus for regulating the temperature of a model engine glow plug filament. Between pulses from a power circuit, an amplifier applies its output voltage to a filament current path comprising...
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4121092 |
Electric power apparatus
Apparatus for controlling the supply of electric power to a power consuming appliance (e.g. an electric soldering iron) in dependence on a parameter (e.g. the temperature of the soldering iron)...
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4119835 |
Electronic thermostat
A method and device for controlling the power supplied to an a.c. powered load by zero-passage switching. A ripple voltage which is superimposed on the control voltage synchronizes the start of a...
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4114024 |
Feedback-controlled radiant furnace for firing ceramic material and the like
A radiant furnace for firing ceramic material provides for accurate control over the rate of increase of the ceramic material temperature during a firing operation. Heat is radiated in the furnace...
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4111443 |
Control system for energizing electrical resistance heaters in cooking fluids
A system for controlling energization of an electrical resistance heater disposed in heat exchanging relation with a food cooking medium includes a signal generator providing an output signal of...
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4109134 |
Power control circuit and electro(photo)graphic apparatus employing same
A circuit for controlling the power transmitted from an a.c. voltage source by a switching element, particularly a triac, connected in series with a power element, e.g. with the heating element of...
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4102298 |
Device for deposition of semi-conductor material
A device for supplying heating current to a semiconductor carrier in connection with the thermal separation from a reactance gas, and deposition of semiconductor material upon such a carrier, with...
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4093847 |
Temperature control system for electric fluid heater
An electric fluid heater of the type in which the fluid is heated by passing electricity through it includes an electronic temperature control system responsive to a temperature sensor in the fluid...
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4092649 |
Thermographic recorder energizing its heated stylus independently of stylus resistance
The recorder includes a heated stylus which is positioned across a heat-sensitive chart by a servo motor to make the stylus position follow the value of an input signal applied to a servo balancing...
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4091265 |
Fuel filter heating assembly
A solid state fuel heater unit for use in heating the fuel flow in a fuel filter is disclosed which unit includes a heat conducting ring having a power transistor mounted thereon and driving a...
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4091266 |
Electrical circuit for controlling a temperature of a heating element
A switching means detects a malfunction due to an open circuited or broken state of a temperature sensing element. The switching means overrides a normal control by the temperature sensing element...
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4088871 |
Power limiting device for an electronically controlled electric heating system
A power limiting device for an electric heating system electronically controlled by a modulating thermostat includes a bistable trigger circuit having an auxiliary temperature sensor preferably...
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4086466 |
Automatic heater controller
A system for controlling the temperature of the heater element of a heating apparatus by controlling the resistance of the heater element. In a preferred embodiment, the control system monitors a...
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4085309 |
Control circuit arrangement for a portable electrically heated hair treatment appliance
An airstream is established and flows about a resistance heater element in an electrical appliance. The heater element is energized by a cyclical potential. A temperature control circuit is...
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4081963 |
Control circuit for a servo-motor
The invention relates to a control circuit for a servomotor of the type having a piston displaceable to selectable positions in one direction by an expansible substance heatable by an electric...
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4081660 |
Heater shutdown circuit
The heater shutdown circuit is connected between an electric current source and a heating element in an electric heater and is operable to shut off the flow of current to the heating element when...
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4074110 |
Hand held electric heating device
An electrically powered hand-held heating device having an electrical heating member with a sleeve member disposed thereabout for insulating the user's hand from localized heating of the heating...
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4071817 |
High temperature electrochemical cell tester
A method for testing the electrolyte of a high temperature electrochemical cell and a system for carrying out this testing method so that the condition of the electrolyte can be monitored during...
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4066867 |
Temperature control circuit with two independent switch outputs
The invention is a temperature control circuit which time shares a temperature sensor and related circuit elements in order to switch two control signal outputs, each output at one of two...
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4056708 |
Digital temperature controller
A temperature control assembly for a centrifugal chemical treatment apparatus of the type having a temperature monitoring thermistor and a rotor heater. The heater is energized from a power source...
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4054778 |
Solid state electronic oven control system
A solid state electronic control system for a cooking oven is provided which is particularly adapted for cooking meat. The control system includes a first heat sensor which monitors the internal...
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4046991 |
Power control apparatus
A power control apparatus uses a digital electronic counter to gate a triac for controlling the current supplied to a load. The preferred arrangement is that each of 10 possible counts achievable...
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4041276 |
Electric fluid heating device
An electric fluid heating device for heating comparatively small amounts of a fluid mdium, particularly for dental purposes, is characterized in that an operable controllable semiconductor, such as...
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4040565 |
Control unit for thermal conditioning systems
A control unit for a temperature regulating system for heating or cooling a space includes an analog network, responsive to various variable environmental factors and simulating various fixed...
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4039928 |
Electrical operating circuit having semiconductor device junction temperature monitoring
An operating circuit for a semiconductor switch device of the type that passes electrical current from a source to an electrical load by forward biasing of the semiconductor's control terminal...
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4032746 |
Control system for a fusing apparatus
A control system in which the thermal energy produced by a first heat source and a second heat source cooperating therewith is regulated by adjusting the phase of the voltage applied thereto.
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4031352 |
Electric blanket
An electric blanket assembly having a blanket whose heating elements are supplied from a low voltage supply source and a control circuit assembly adapted both to regulate the heating of the blanket...
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4029937 |
Control system for electrically conductive liquid heating apparatus
Electrically resistive liquids such as tap water are heated in an all solid state electrical apparatus. Spaced inner and outer conically shaped electrodes provide a flow path for the water or other...
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4024336 |
Split bushing control
A circuit is described for controlling the temperature of a heating element used to heat molten glass in a bushing from which the molten glass is drawn into glass fibers and in which the bushing is...
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4021722 |
Temperature-sensitive current divider
A pair of transistors have interconnected emitters connected to a constant-current supply which determines the combined values of their emitter currents--and thus of their collector currents. The...
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4001541 |
Flash fusing system with energy control
A flash fusing system for fusing toner images onto support material in which the support material is transported in a path past one or more flash fusing lamps. The flash fusing lamps are coupled to...
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3999190 |
Temperature control system for ink jet printer
An ink jet printer has a printing head which contains at least one cavity with a discharge orifice therein for dispersing droplets of ink onto a medium for printing thereon. Means are disclosed...
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3988682 |
Voltage ramp temperature controller
A temperature control circuitry for use in detecting the temperature of a vice and providing a programming voltage output for controlling a heating apparatus to vary the temperature of the device....
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3982098 |
Heater and control system
A heater for water beds, and a heater control system for the heater, with the control system located in the same structure envelope that houses the heater elements. The control system has...
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3982097 |
Programmable electronic control system for multiple electric stations
A programmable electronic control system for an array of electrical stations exemplified by food tray stations each of which is adapted to receive a food tray having two or more electrical heaters...
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3973140 |
Control circuits for vehicle rear window heaters
A vehicle rear window heater control comprises a touch switch, a bistable circuit driven between its two states by the touch switch, a relay operated by the bistable circuit so that the heater is...
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3969611 |
Thermocouple circuit
A thermocouple circuit has dissimilar conductors joined to form a conventional temperature transducer located in a zone to be monitored or controlled. The opposite ends of these conductors are...
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3968467 |
Touch controlled voltage-divider device
A voltage divider device capable of providing any voltage in a preselected range of voltages, which voltage may be set by a touch of the finger is disclosed. The device includes a control element...
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3962559 |
Temperature control circuit and oven
A transistor with its base-emitter bias controlled by a positive temperature coefficient thermistor provides a controlled heat source for maintaining precise temperature within a small oven which...
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3959621 |
Thermally sensitive switch device
A main thyristor is serially connected to a load across an AC source. A thermally sensitive thyristor is connected at the anode to the anode of the main thyristor through a resistor and at the...
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3955067 |
Fat frying timing system
An electronic timing system for timing a frying cycle of a fat frying apparatus includes means for adjusting the timing cycle for variations in the temperature of the fat or oil used in the fryer....
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3952182 |
Instantaneous electric fluid heater
A miniature electric fluid immersion heater adapted for instantaneously heating relatively small bodies or flow increments of fluid to a predetermined temperature. The heater is particularly...
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3946200 |
Proportional temperature controller
A temperature controller for use with an electrical heater for precisely maintaining the temperature within a system at a selected set point, and employing an improved bridge circuit. A temperature...
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