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Class 340/584 - Thermal


Subclass of Class 340 - Communications: electrical
Definition: Subject matter wherein the condition is a predetermined
No. of patents: 546
Last issue date: 05/29/2012


                    14  
NumberTitleIssue Date
4251764Interface circuit for interconnecting an electronic controller to a resistance welding machine
An interface circuit is provided for interconnecting an electronic controller to a contactor circuit which, in turn, controls the alternating current flow from an alternating current power source to controlled equipment, such as a resistance welding machi...
02/17/1981
4247848Fire detector with a monitor circuit
In response to oscillator output pulses, a sample pulse generator supplies sample pulses to a fire sensor. In response to the sample pulses, the fire sensor produces a fire sensor signal. A judging circuit receives the fire sensor signals and, if they exc...
01/27/1981
4240077Thermostat
A thermostat monitoring and controlling the temperature of produce ripening within an enclosure and featuring a bridge circuit sensing errors between the actual and desired temperatures in which the desired temperature is selected directly in units of deg...
12/16/1980
4219803Two-wire fire sensing and receiving system
A two-wire fire sensing and receiving system having a plurality of fire sensors connected in parallel in which; the difference in current level between a feeding electric current of a relatively small level for controlling the system and a sensing current of ...
08/26/1980
4209491Control and monitoring system for oxygen generating device
A control and monitoring system for an oxygen generation device having a plurality of chemical oxygen generation elements sequentially decomposed to continuously generate oxygen. The control and monitoring system has a temperature sensor operatively coupl...
06/24/1980
4203326Method and means for improved optical temperature sensor
An improved optical fiber temperature sensor includes at least one optical fiber light conductor including an optical fiber core, cladding material around the core, and a jacket surrounding the core and cladding material. The core exhibits an evanescent f...
05/20/1980
4199754Circuit for an emergency lighting and fire detector system
A circuit for a home safety unit having an emergency light system for providing light in the event of a power failure or when a fire is detected, and a fire detection system for providing an audible alarm indicating the existence of a fire. The circuit in...
04/22/1980
4194180Apparatus for registering quantity values of corresponding volume or energy quantities by means of counters in a central station
Apparatus for registering quantity values of corresponding volume or energy quantitites measured at consumption points at a distance from a central station which has a number of counters corresponding to the various consumption points. Each time a predete...
03/18/1980
4162489Fire alarm system comprising a plurality of alarms which may be operated by way of an alarm loop
A fire alarm system comprises a plurality of alarms which may be operated via an alarm loop and which, being subject to selective interrogation, each alarm transmits an analog value of a particular characteristic of a fire to a central control, the analog...
07/24/1979
4161727Process for generating and transmitting different analog measured values to a central control from a plurality of fire alarm circuits which are arranged in the form of a chain in an alarm loop
A fire alarm system has a central control connected to an alarm loop composed of a plurality of fire alarm circuits. Prior to an interrogation of the alarm circuits, the same are disconnected from a supply voltage and supplied by respective capacitors whi...
07/17/1979
4149159Fire detection system
In a fire detection system, detectors of different sensitivities are arranged in pairs and the pairs of fire detectors are positioned at regular intervals along an elongated protection area, whereby detectors of one sensitivity alternating with detectors ...
04/10/1979
4148019Security alarm transmission system
A security alarm transmission system for protecting a building includes a plurality of alarm transmitter units each having a transmitter circuit controlled by associated condition sensors to generate coded alarm signals which are inductively coupled to a ...
04/03/1979
4141006Security system for centralized monitoring and selective reporting of remote alarm conditions
A security system consists of a central digital processor system, e.g., a general purpose computer, to which plural remote units are connected by a digital communications link, e.g., telephone. The remote units include plural alarm sensors such as intrusi...
02/20/1979
4108001Urea composition for forming thermoparticulating coating
A composition is disclosed of a urea compound, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticul...
08/22/1978
4100543Audible alarm apparatus particularly adaptable for use with fire and theft security systems
The alarms circuit provides a first signal indicative of a fire alarm and a second signal indicative of another intrusion such as a burglary. The circuit includes a high frequency RC oscillator which undesireably possesses a duty cycle different from fift...
07/11/1978
4079786Fire extinguishing system
The invention herein relates to improvement in a fire extinguishing system which is arranged and constructed to cover a room area with a mist spray. The improvement herein consists in providing each room, as in a house, with a unitary ceiling perimeter mo...
03/21/1978
4074225Emergency detection alarm and evacuation system
An emergency detection alarm and evacuation system adapted for use in a multi-storied building comprises a plurality of spatially distributed fire/smoke detectors and a plurality of exit signalling units respectively located adjacent the emergency exit do...
02/14/1978
4064507Noise generator circuit for a security system
A solid state noise generator circuit responds to digital signals indicative of alarm conditions, by initiating frequency modulated digital audio output waveforms distinctly identifying the monitored condition to provide audible recognition of each alarm ...
12/20/1977
4012728Back up alarm system
Electrically conductive leads electrically connect a relay, a source of electrical energy and a radio transmitter for transmitting radio signals in a back up circuit. The relay is electrically connected to the electric circuit of a burglar alarm system. W...
03/15/1977
4006460Computer controlled security system
A bidirectional electronic interface couples remote sensing security transducers such as fire and burglar monitoring devices to a computer such that the circuitry of the bidirectional electronic interface functions to both transmit signals from the remote...
02/01/1977
3973439Metal acetyl acetonate composition for forming thermoparticulating coating
A composition is disclosed of a metal acetylacetonate, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermo...
08/10/1976
3969710Apparatus for picking up signal currents flowing through signal lines
In apparatus for picking up a pulse shaped signal current flowing through a signal line for operating a remotely located relay, a pickup coil is wound on a magnetic core linking the signal line and the voltage induced in the pickup coil is applied to a hi...
07/13/1976
3968483Burglar and fire alarm system
A security alarm system for a building includes rechargeable battery-operated alarm circuitry, with the system including a burglar alarm in conjunction with an entrance door. Inside switches selectively activate the system and operate an electric motor to...
07/06/1976
3962693Motion detection device including a pendulum switch
A motion detection device is characterized by an array of mutually spaced electrical contacts connected to one terminal of a pair of terminals having a voltage differential established therebetween, an electrically conductive first mass suspended between ...
06/08/1976
3942030Arrangement for detecting dielectric breakdowns in metal-clad high-voltage switching and transmission installations
An arrangement for detecting dielectric breakdowns in a metal-clad, high-voltage installation made up of a plurality of component sections includes a thermal sensor for each of the sections wherein a dielectric breakdown may occur for sensing the temperat...
03/02/1976
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