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4900900 |
Method and apparatus for controlling a-c power by means of thyristors for a resistance-type electric furnace
A method of controlling a-c power by means of thyristors for resistive electric furnace for achieving a temperature control thereof, comprises providing an output which varies between O and N...
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4897527 |
Press for fabrics
A fabric press comprises a press with a heating element (1) a temperature sensor (17), and a microprocessor based controller programmed to apply electrical power initially to the element for a...
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4894520 |
Circuit for controlling power dissipated by an electrical resistance
A circuit for controlling the power dissipated by an electrical resistance coupled to a supply voltage which varies, includes a feedback circuit, coupled to the electrical resistance, for producing...
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4894514 |
Heated transparency with malfunction detection means
In a system for electrically heating a transparency, a malfunction in the heating circuit is detected by a Hall effect sensor that detects current changes in a lead to the heating circuit. The...
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4888471 |
An improvement in a device for high accuracy thermal regulations of an enclosure
In a device for thermal regulation of an enclosure comprising a temperature-measuring circuit which consists of a resistor bridge, of at least one heat-sensitive element on one bridge arm and of an...
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4883944 |
Heating apparatus having an open-loop configuration for controlling temperature
A heating apparatus measures the operation time and the inoperative time using an operation equation to switch the magnitude of the thermal supply of the heating apparatus in accordance with the...
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4882782 |
Safety apparatus for detecting an abnormality of power control element
A safety apparatus for an AC control circuit has a bidirectional thyristor, a photocoupler for detecting a load current, a transistor and a self-hold circuit for checking if a detection output from...
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4870252 |
Condensation controller
The temperature of liquid in a tank and of the environment adjacent the tank are measured and a heater in the tank is controlled to heat the liquid if its temperature is sufficiently below that of...
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4859834 |
Power controller for heat tracing cable which responds to ambient temperature
A power controller is provided for controlling the distribution of power to heat tracing cable or the like. Heat tracing cable is used for maintaining a desired process temperature in pipes or...
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4853519 |
Heating apparatus for heating in a plurality of heating modes
A heating apparatus that utilizes a heating member for heating a desired subject detects the temperature of the subject being heated. This apparatus further generates a plurality of preset...
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4845342 |
Circuit for providing electrical energy to a heatable means
The present device includes a bridge circuit with a first intermediate terminal and a second intermediate terminal and with one leg of the bridge circuit being a heating element. Connected across...
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4829159 |
Method of optimizing control of plural switched electric loads to reduce switching transients
A method of controlling several clocked loads controllable individually and independently of each other, more particularly heating loads of an electric oven, for minimizing the demand on an...
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4822982 |
Automatic circuit control for electrical resistance cooking apparatus
In an electric direct energy transfer cooker for quickly cooking food, particularly fowl such as chicken, contactably interposed between electrodes, a food doneness control circuit is connected...
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4816642 |
Hot melt adhesive applicator and temperature control circuit therefor
A hot melt adhesive applicator operable at a number of selected temperatures having a portion of the circuitry for control of the applicator temperature at a point remote from the applicator body....
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4798935 |
Driver circuit
A driver circuit having a predetermined on time and a predetermined off time provides a drive signal to a heating element of an aroma generating apparatus. The drive signal is applied during each...
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4795886 |
Temperature control in which the control parameter is the degree of imperfection in the impedance matching
A temperature control system is disclosed for controlling heating current to a heater having an impedance which varies substantially with temperature. The change in impedance of the heater changes...
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4793343 |
Respiratory heated face mask
A face mask for use in cold weather to supply warm air for inhalation by normal breathing to persons having respiratory and heart ailments to avoid the discomfort, pain and limited mobility caused...
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4786799 |
Power control for cooking appliance with multiple heating units
An improved electric cooking appliance with a plurality of heating units arranged in two groups, a first group adapted for energization by a first AC power signal and a second group adapted for...
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4778980 |
Instant-on fuser control
A fuser temperature control using a resistive bridge driven power circuit. At the beginning of each positive half cycle of the AC line voltage, the possible firing of the triac is delayed by 100...
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4777350 |
Heater with duty cycle controller
A heater including a sensing device for sensing an ambient temperature, a temperature input device for providing a user selectable input temperature both connected to a first circuit to control the...
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4761539 |
Oven calibration system having variable stored calibration value
In an oven calibration system, a value is stored corresponding to a predetermined temperature, and a calibration value is also stored corresponding to an offset. The calibration value is variable....
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4755656 |
Toaster
An electrical toaster is provided with timer means which is initiated when a food product carrier is secured in an operative position adjacent a toasting element. The timer means normally releases...
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4751371 |
Temperature controller and alarm device for use with a cartridge heater having a heating element and thermocouple
A temperature controller and alarm device for use with a cartridge heater of the general type providing heat within a mold in a plastic injection molding apparatus includes an amplifier for sensing...
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4744359 |
Cautery hemostatic unit
This unit is for stopping hemorrhage by supplying a current for heating to a semi-conductive thermal element of small heat capacity to insure good heat response which is incorporated in the distal...
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4745262 |
Energy control system
A control system for controlling the supply of electrical power to a heating element associated with an electrical appliance such as a frypan. The application of power to the heating element is...
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4740888 |
Control system for cooking apparatus
A control system for cooking apparatus including a heat source, a heat control system and a back-up thermostat system having a back-up temperature probe. The control system includes a digitally...
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4736090 |
Electric heating circuit
A temperature sensitive control circuit for an electrically heated rotatable drum (11) including an internally disposed electric heater (27) and an electric temperature sensor (28) and, outside of...
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4736091 |
Integral sensor controller for an electrical heater
Integral sensor controller for an electrical resistance heater, where the heater is constructed from materials such as nickel, balco, platinum, alumel, or like materials which have an appreciable,...
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4731519 |
Curling iron adapted to provide uniform heat when used with either domestic or foreign voltages
An electric curling iron operative to provide uniform heating at both domestic (120 v) and foreign (240 v) voltages includes first and second rope-type electric heaters disposed side by side in the...
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4720623 |
Power control device for a resistance heater in an oven
A power control device for controlling power to a resistance heater in an oven uses a microprocessor, temperature measuring circuit, power measuring circuit, a triac circuit for firing the heater,...
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4719326 |
Microprocessor power relay control circuit for a microwave oven
A power relay control circuit for a microwave oven including a microprocessor as its controller is provided, wherein two power relay driving transistors are to be turned on or turned off by a...
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4717811 |
Differential resistance humidity detector
A humidity detector includes a first heat-sensing element for an electric signal corresponding to the temperature of steam to be detected and a second heat-sensing element for an atmosphere...
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4705937 |
Apparatus for automatically controlling the temperature of welding bands
A device for automatically controlling the temperature of welding bands consisting of a dividing circuit for determining the temperature of the welding band. A controller is provided to control the...
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4700052 |
Apparatus for controlling and adjusting heat output during the heating phase of a steam pressure cooking vessel
An apparatus for controlling and adjusting heat output during the heating phase of a steam pressure cooking vessel. The steam pressure cooking vessel is heated by an electric heating element and...
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4695705 |
Apparatus and method for localized heating of an object at precise temperatures
Apparatus for and a method of precisely positioning an object to be subjected to localized heating at precise temperatures at the second focal point of an elliptical reflector which has an...
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4692598 |
Temperature controller system
A temperature controller for an incubator or an oven for keeping the temperature in a chamber at a constant level by controlling the energization of heaters. The temperature controller is provided...
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4691703 |
Thermal cautery system
A thermal cautery system having an endoscopically deliverable probe connected to a power supply and display unit. The power supply and display unit, when triggered by a footswitch, energizes a...
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4686352 |
Electronic pressing iron
An electric pressing iron having a motion and attitude sensor including a mercury switch connected to a timer, and in conjunction therewith is adapted to disable the electric heater of the iron...
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4677281 |
Electric heating apparatus with integrated solid state comfort control and overheat protection
A heated bedcover containing an electrical heating element therein is provided with an integrated solid state control circuit which functions providing control over the heating element both for...
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4668856 |
Method of controlling the heating of an aqueous load in a cooking utensil
A method of controlling the heating of an aqueous load in a cooking utensil, which is placed on an electrically heated cooking plate or hob. During the heating process, at repeated occasions...
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4660057 |
Heater power controller for ink jet printer
A heater power controller for an ink jet printer wherein the output of a comparator making a comparison between a detection signal of the temperature of an ink in a print head of the ink jet...
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4659910 |
AC-DC transfer standard temperature sensor reversal error compensation circuit
A compensation circuit for a heater wire and a temperature sensor, the temperature sensor generating a signal whose amplitude is dependent upon the amplitude of the voltage across the heater wire....
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4649365 |
Platinum resistor for the measurement of temperatures
A platinum resistor for the measurement of temperatures having a silicon substrate, an aluminum oxide film formed on said silicon substrate, and a platinum film formed on said aluminum oxide film.
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4644137 |
Circuit for controlling a rice cooker with power interruption control
A circuit for controlling a rice cooker having at least one heater used for cooking rice comprises, a rice cooking mode setting section capable of selectively setting three or more different rice...
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4644138 |
Temperature control system with simplified controller and power supply
The invention includes a simple and inexpensive thermal controller and simple and inexpensive radio frequency alternating current generator which are provided in an improved temperature control...
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4642441 |
Portable fan for winter and summer use
A multi-purpose fan including an electrically driven fan blade assembly, a heating coil positioned in the front of the blade assembly and rotatable air directing means which in use causes a...
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4641013 |
Dual stage thermostat and electric space heating system
A dual stage thermostat for an electrical space heating system in which there are two microswitches connected in parallel and operated by a common bimetallic strip. The first switch when closed...
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4636620 |
Temperature compensation injector control system
A temperature compensation injector control system as used in an electronic fuel injection system for motor vehicles utilizes the value of the voltage levels across the coil (18) to determine the...
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4636619 |
Heater control device
A heater control device in which a heater is made to double as a temperature sensor so as to eliminate the leading wires used exclusively for the temperature sensor. The heater control device...
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4634842 |
Diagnostic testing arrangement for an electric cooking appliance incorporating commutated relay switching circuits
A power control and diagnostic arrangement illustratively embodied in an electric range having multiple surface heating units which are selectively coupled to an AC power supply by commutated relay...
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