Class 340/655 - Heating circuit

Subclass of Class 340 - Communications: electrical
Definition: Subject matter where the monitored circuit includes an electric
No. of patents: 35
Last issue date: 09/16/2008

Number	Title	Issue Date
7425896	Tag testing device, tag testing method, and tag testing program A tag testing device uses an infrared camera to take an image of a plurality of radio frequency identification tags, compares the image with a stored standard tag pattern image storage, and detects defective tags based on the comparison. A radio wave transceiver bul...	09/16/2008
7301468	Method and apparatus for real time monitoring of an electric furnace heating coil Heating coils used in an electric furnace used to process semiconductor wafers are monitored on a real time basis by sensing the AC current in a power line delivering electrical power to the furnace. The AC current is sensed by a coil positioned around and magnetica...	11/27/2007
7209048	Device for monitoring and alerting of a power disruption to electrical equipment or an appliance The present invention is a simple, inexpensive and reliable device for monitoring and alerting of a power disruption to an appliance or a piece of equipment. An audible and/or visual alarm may be generated in the event that a specific or a piece of electrical equipm...	04/24/2007
6977591	Smart power control technique to reduce power and heat consumption A method for monitoring a state of a switch is disclosed. The method includes providing a high side driver circuit in communication with a voltage source, activating the high side driver circuit at a first predefined time interval, and sourcing voltage to a resistor...	12/20/2005
6956489	Heating element condition monitor A method for monitoring the condition of an electric current-carrying heating element involving installing the heating element in a location and setting the initial composition Ci of the material as a reference baseline at an initial time Ti co...	10/18/2005
6445302	Pet wireless doorbell device A pet training device designed to alert a pet owner that his/her pet would like to enter or exit the home....	09/03/2002
6294994	Appliance attendance monitoring apparatus An attendance monitoring apparatus is provided for an appliance, such as an electrical appliance, and includes a housing and a motion sensor assembly contained in the housing. A timer assembly is electrically connected to the motion sensor assembly, and a...	09/25/2001
6130413	Safety device for electric cooking stove A safety device for use in conjunction with an electric cooking stove includes a relay unit having a plug having two live pins and a neutral pin for insertion in a stove receptacle, a receptacle receiving a similar plug of a stove, a relay arrangement for...	10/10/2000
5973605	Thermistor monitor system A combination of circuits is responsive to a respective one of a definite number of operation patterns of a plurality of PTCs, the operation patterns being different therebetween and including a plurality of first patterns each respectively representative...	10/26/1999
5702624	Compete hot plate temperature control system for hot treatment A heat treatment control system to cure a photoresist that is deposited upon a semiconductor substrate is described. The heat treatment system has a hot plate with a heating element and temperature sensing devices that are in close proximity to the semico...	12/30/1997
5448504	Apparatus for thermal analysis A CPU 8 computes differential data of thermal analysis data in a data memory 9a, stores the differential data in a differential data memory 9b, scans secondary differential data, and detects the crossing point of a set differential width as a peak point. ...	09/05/1995
5182432	Crack detector and heating circuit for motor vehicle headlight light transmissive shield A circuit arrangement for a motor vehicle headlight including a reflector and/or a lens, a light source coupled to a voltage providing device (W), at least one electrically conductive heating element (H) mounted on or in an enclosing light-transmissive sh...	01/26/1993
5160831	Multi-mode control circuit and indicator arrangement for an electrical appliance A time-based electrical appliance multi-mode control circuit and indicator arrangement which is connected to a power supply and an on and off switch. Upon turning the switch on, power is simultaneously supplied to the electrical appliance load and to a du...	11/03/1992
5149209	Hair dryer with audible unplug alarm A hair dryer that includes a case having a handle and a barrel, and a fan positioned in the barrel and coupled to an electric motor for blowing hair through the barrel. An electrical resistance heating element is disposed in the barrel for generating heat...	09/22/1992
5043670	Block heater tester A circuit tester indicates the presence of power at an outlet and the continuity of a resistive load connected to the outlet. The tester is particularly useful as an automotive block heater circuit tester. The tester has a housing with a male end equipped...	08/27/1991
4972152	Apparatus and method for testing ignition modules and components of gas burners An apparatus and method for testing the ignition modules of gas burners is disclosed, and functions without the requirement of a gas feed in the test program. The method involves disconnecting the ignition module from the electrical supply, and from the g...	11/20/1990
4935600	Soldering apparatus with one or more temperature controlled soldering irons A soldering apparatus comprises at least one soldering iron (19) with a heating element (21) and a regulating circuit including a temperature sensor (22) for regulating the working temperature of the soldering iron (19) to a predeterminable desired value ...	06/19/1990
4825199	Circuit underloading monitoring system An improved system for the detection of underloading in an electrical heating circuit where monitoring is available in proximate and remote locations. Circuit monitoring is augmented by control devices which activate alarms in visual or audible form when ...	04/25/1989
4775913	Safety shutoff device for a stove A control device for controlling the operation of an object of cooking such as a stove or the like. The presence of a user in the area of the stove is detected. When the user is present, the stove operation is enabled. After the user has been absent from ...	10/04/1988
4774526	Fault detection circuit for a thermal print head A thermal printer with a fault detection circuit for detecting faults in heating elements of the printer includes a print head containing heating elements and a heating circuit for each heating element and a power supply for supplying power to the heating...	09/27/1988
4751495	Analog pulsed heat trace monitor or the like A system, utilizing an analog pulsed signal, is for monitoring the condition of a system, by way of illustration, a multi-circuit electrically heat-traced substrate. The system senses the temperature of the substrate at the end of a heat traced circuit, c...	06/14/1988
4727240	Electric iron with dual automatic cutoff An automatic-cutoff electric iron employs two timing cycles for turning off power to the electric iron upon the absence of motion for two different discrete time periods. A motion sensor includes an angle sensor to enable a short timing cycle for cutting ...	02/23/1988
4639719	Apparatus for monitoring circuit integrity An apparatus to monitor a circuit in which an AC voltage source is connected to a plurality of paralleled current consuming loads, such as heaters, including a reactive load in parallel with the current consuming loads at a point in the circuit more dista...	01/27/1987
4612498	Induction furnace fault locator The specification discloses a computerized monitor for a coreless induction furnace. The monitor includes a first potential transformer connected across the coil and a second potential transformer connected between one end of the coil and an electric grou...	09/16/1986
4542284	Electrical appliance with delayed warning alarm In combination with an electrical appliance, an automatic warning circuit to warn a user of an electrical hazard wherein the warning circuit comprises a timing circuit responsive to turn-off of the electrical appliance for generating a triggering signal a...	09/17/1985
4539453	Control circuit for a microwave oven A control circuit for a microwave oven with a mechanical switch locking assembly, wherein a cooking start switch is available to turn on after closing a door and is turned off when the door is opened. The control circuit includes a relay for connecting a ...	09/03/1985
4496940	Sensing and indicator system for detecting heating element failures A sensing and indicator system for monitoring multiple electric heating elements connected in three-phase balanced Y circuits in heat reactivatable adsorbent gas fractionators. The system senses a failure induced imbalance, pinpoints the location of the g...	01/29/1985
4425490	Programmable electronic cooking apparatus When a door of a microwave oven is opened during a programmed cooking operation, a door open monitoring circuit provides a door open signal to a microcomputer so that the microcomputer interrupts to execute the programmed cooking operation. A control circ...	01/10/1984
4207566	DC Current level detector for monitoring a pitot tube heater and associated method A DC current level detector is provided for monitoring the heater current of a pitot tube. The detector includes a toroidal core defining a bore through which can be passed a line carrying the current to be detected whereby an amount of flux is generated ...	06/10/1980
4203101	Electric power interrupting apparatus A sensor controlled device for interrupting electric power to a portable electric clothes iron. Two sensors are attached to the handle of the iron. These sense skin contact of the operator and horizontal orientation of the iron. The sensors control circui...	05/13/1980
4066870	Flexible electric heating cable A flexible heating cable having a cold lead section and a heating section, in which a thermostat is disposed in the cold wires of the cold lead section and a light and a switch are disposed in a flexible translucent plastic pouch remotely located from the...	01/03/1978
4053876	Alarm system for warning of unbalance or failure of one or more phases of a multi-phase high-current load An alarm system for warning of unbalance or failure of one or more phases of a multi-phase load circuit which is convenient and practical to use even where the load circuit is drawing a large current and where the flow of power to the load may be controll...	10/11/1977
4044348	Circuit energization indicator with thermal timing means to maintain the indication for a predetermined time after de-energization A thermal timer produces a timed duration output in response to a thermal input to a thermal storage device and a thermal energy leakage parameter from that storage device. The storage device preferably is a metal slug positioned in a silica aerogel insul...	08/23/1977
3976985	Alarm circuit suitable for monitoring freezer temperature A solid state electronic alarm circuit including means for sensing a predetermined change in a parameter such as the temperature in a freezer or the like from a predetermined safe limit and means for generating an audible alarm in response thereto....	08/24/1976
3973105	Protective device for induction heating apparatus A protective device for an induction heating apparatus comprising: means for detecting a change of value and phase of a current passed to an excitor for induction-heating a heating element by generating an alternating magnetic field; and means for breakin...	08/03/1976

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Class 340/655 - Heating circuit