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4381922 |
Combustion detecting device using metallo-phthalocynine semiconductor and process of preparing same
A device for detecting combustion products and effects resulting from combustion is made by preparing a composition of metallo-phthalocyanine in amorphous or crystaline form selected from the group...
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4380760 |
Smoke detector with delayed alarm after change to stand-by power
The smoke detector is powered by standard AC current and a stand-by power source consisting of rechargeable batteries. A detector is provided for detecting the loss or failure of AC power, and the...
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4369435 |
Fire detector and fire alarm system having circuitry to detect removal of one or more detectors at a signal station
A fire detector and a fire alarm system wherein a plurality of fire detectors are connected across a pair of lines leading to a signal station and which is capable of detecting, at the signal...
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4365237 |
Security audio visual emergency system
A conventional lamp having a tubular yoke around the bulb that supports a lamp shade is converted into a security system by a simple physical electrical and mechanical coupling of two modules,...
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4363031 |
Wireless alarm system
A wireless smoke alarm system in which each detector includes a local smoke detector and an alarm. These are coupled to a transmitter and a receiver. The transmitter and receiver are within range...
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4358760 |
Portable fire alarm apparatus
There is disclosed a portable fire alarm apparatus which comprises a foldable housing consisting of a base assembly having a surface for resting upon a horizontal plane. A central section is...
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4351701 |
Method of controlling a coking cycle
The endpoint of devolatilization of a coal mass in a coke oven during a coking cycle is determined by providing a probe which is capable of supplying an electrical signal which indicates the...
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4335379 |
Method and system for providing an audible alarm responsive to sensed conditions
An alarm system responsive to a predetermined concentration of gaseous hydrocarbon in an area. A gaseous hydrocarbon responsive variable resistance element having a heater has resistance...
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4330808 |
Automatic control for processing signals from an overheat monitor of a dynamoelectric machine
An electronic control system to automatically determine the validity of an apparent overheating signal from an overheat monitor of a gas-cooled dynamoelectric machine and reduce machine load or...
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4321591 |
Portable, self-powered multiple warning device
Portable, self-powered multiple warning device, including an alarm clock, a smoke or gas detector, a common power source for powering the alarm clock and smoke or gas detector, first warning means...
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4319234 |
Smoke detector with dual sensors
Smoke detector, comprising a housing the length side of which is several times greater than the width side thereof, incorporating a sensor and a power source; a U-shaped bracket having a base...
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4319231 |
Fire sensing system protected from noise factors
Fire detection signals are produced with high reliability based upon a quantity smaller than a predetermined quantity from a fire sensing system which detects predetermined standard quantities of...
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4316184 |
Combination combustion-products detector
A photosensor circuit produces a first sensor signal having an amplitude related to the quantity of smoke sensed thereby. An ionization sensor circuit produces a second sensor signal having an...
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4313110 |
Smoke alarm having temporary disabling features
A smoke alarm having means for detecting smoke and producing a signal in response to the detected smoke is provided with a manually-actuated control which cooperates with the signal producing means...
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4305069 |
Personal smoke and fire detector and warning unit
This invention is a combination smoke and fire detection and alarm system that comprises a battery powered personal unit and an AC/DC sustaining unit. It provides audible and visual alarms and an...
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4302753 |
Multi-function combustion detecting device
A battery powered products of combustion detector and warning device, which is interconnectable in a detecting system with other similar devices, is characterized by means for providing separate,...
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4288790 |
Fire alarm
In a fire alarm or detector where radiation in the visible or infrared spectral range, is transmitted in a pulsed mode in a measuring chamber, there is provided an acoustical receiver which...
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4287517 |
Circuit for eliminating low battery voltage alarm signal at night
A battery-operated smoke alarm includes an alerting signal means for indicating when the battery voltage is low by comparing a first signal which is a function of the battery output voltage with a...
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4283657 |
Exit illuminating system
An exit illuminating system for illuminating an exit or exit sign with high intensity light under emergency conditions, the light having sufficient brilliance to be visible through smoke in order...
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4282519 |
Interconnection of alarms of smoke detectors with distinguishable alarms
A smoke detection alarm system which has at least one detector and alarm in each of the plurality of areas with an interconnection circuit whereby upon the detection of an abnormal smoke condition...
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4266218 |
Alarm system control circuit
A circuit for reducing or eliminating the sensitivity of alarm circuitry to false alarms caused by noise occurring synchronously with a 60 Hz line voltage. The 60 Hz line signal is applied to a...
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4264331 |
Charged non-conductive polar gas sensing element and detection system
An air pollutant and/or fire combustion sensing apparatus includes a charged insulating sensing electrode layer establishing an electric field as the result of electric dipoles and/or electric...
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4258359 |
Portable protective device
A portable, self-contained protection device includes a battery operated combustion product sensor and intrusion switch, providing energization to an audible warning device, all contained in a...
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4258291 |
Smoke alarm activated portable lamp
A smoke alarm activated portable light or lamp for providing emergency illumination in response to an alarm signal from a smoke alarm device includes a frequency selective microphone, several...
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4254414 |
Processor-aided fire detector
A fire detection system which includes an environmental sampling assembly upled to a programmable digital processor for detecting a threat of fire and reducing the occurrences of false alarms in a...
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4251811 |
Battery test system, as for smoke detector alarm
A system for use in battery powered alarm equipment for self-testing such battery for a low voltage and a high series resistance condition, and particularly for use in systems which utilize a...
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4250500 |
Smoke detector
In a smoke detector of the type wherein an alarm signal is generated to activate an audible indicator and an oscillator circuit drives a pulsating visual indication of standby readiness, the...
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4236822 |
Fire detector housing
A housing for a fire detector has a circumferential area including a series of vanes or slats, each positioned at an angle with respect to the tangent at the periphery of the housing. The angle is...
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4232308 |
Wireless alarm system
A radio receiver equipped central control unit continuously monitors at least one battery-powered remote transmitter activated in response to predetermined alarm conditions, such as open doors and...
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4228428 |
Visible signal for alarm, such as a smoke detector
The cover of a ceiling mounted smoke detector is hung at one side by a chain from the detector frame. At the other side the cover has a clip which engages the smoke detector battery. Thus if the...
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4227191 |
Light emitting smoke detector
A smoke detector is provided having a smoke detection circuit coupled with an audible alarm and a high intensity light source. The high intensity light source is powered separately from the smoke...
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4223692 |
Recreational vehicle safety system
A recreational vehicle safety system includes two independently operable automatic shutoff valve assemblies. One valve assembly is attached directly to the recreational vehicle's appliance...
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4223303 |
Alarm devices for interconnected multi-device systems
Alarm devices are provided with circuit means for permitting interconnection of the alarm devices into an alarm system in which each of the powered alarm devices continually senses for an adverse...
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4222045 |
Capacitive shift fire detection device
A capacitive shift fire detection device having a sample circuit and a reference circuit, each circuit having an air capacitor connected to an oscillator and a counter. The presence of particles of...
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4216468 |
Flood warning device
An alarm for signalling the rise of water above a preselected flood indicative danger level. In a preferred embodiment, the alarm is connected across the terminals of the smoke sensing unit of a...
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4207558 |
Interconnection circuit for a plurality of alarm units
Each alarm unit has a sensing circuit which supplies a signal in the presence of a particular problem such as smoke, heat, or equipment failure. The signal energizes an electronic switching device,...
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4199754 |
Circuit 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...
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4191946 |
Warning apparatus with a line integrity supervisory circuit
Warning apparatus for detecting abnormal conditions, such as fire or smoke, comprises a two-conductor electrical transmission line with detectors connected across the line at spaced locations....
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4189720 |
Repeater for smoke and similar alarms
A repeater is provided for a smoke alarm or similar alarm device which picks up the sound from the alarm device and transmits a coded radio signal to a receiver at a remote location. This receiver...
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4186389 |
Sleeper's smoke-alarm clock
An alarm device functioning both as a time alarm and a smoke and fire alarm, which includes an electric clock with an alarm-setting device, an electrically-activated alarm, cooperating contacts on...
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4178592 |
Fire alarm having a sensor on an extensible arm
A smoke and fire sensitive alarm system designed for portable operation all electronics, power supply and alarm in a single, compact unit which may be placed on any surface. The sensing portion of...
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4177461 |
Smoke alarm device for a grain dryer
An alarm device for a grain dryer. The alarm device activating an audio alarm and visual alarm energized electrically by a smoke detector and burner shutdown indicator lamp to warn the dryer...
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4176346 |
Smoke alarm network
A smoke alarm network for buildings and the like comprises a plurality of stations having a smoke detector alarm unit installed in each. Station switching members are connected at each station, 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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4162489 |
Fire 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...
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4161727 |
Process 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...
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4151522 |
Count discriminating fire detection system
A fire detector senses the change in a physical parameter indicative of a fire such as smoke, heat or the like and produces detection pulses in synchronism with an oscillator circuit when the...
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4150370 |
Smoke detector
A detector for smoke and/or selected gases includes a sensor means to which the smoke or gas is applied. The sensor is connected at one terminal to ground, the other terminal going through a...
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4149159 |
Fire 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,...
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4149154 |
Alarm bell and system
An alarm bell especially adapted to be used in combination with a system which simultaneously detects smoke, fire, current failure, and unauthorized entry into an enclosure. The alarm bell has a...
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