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7614094 |
Machine and method for proactive sensing and intervention to preclude swimmer entrapment, entanglement or evisceration
A machine and method for anticipatory sensing and intervention to avoid swimmer entrapment, entanglement or evisceration; with a proactive, pre-entrapment, ultrasonic sensor assessing the relative...
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7498934 |
Power supply and useful data exchange between a fire alarm control unit and a current sink
A method, system and circuit arrangement exchange data and supply power to at least one current sink connected via at least one data line pair to a fire alarm control unit. A pulsed voltage is used...
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7403135 |
Capacitive relay takeoff swimming platform sensor system
A capacitive relay takeoff swimming platform sensor system including multiple stations, timing devices and capacitive sensor devices where the presence or departure of a second swimmer on a relay...
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7394367 |
Keypad for building automation
An exemplary embodiment of a keypad for building automation may comprise a sensing layer operable to detect user input. The sensing surface configured with a plurality of switching fields assigned...
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6339376 |
Automotive cargo space occupant detector
A moving object detecting apparatus, an abnormality alarm apparatus, and a load-carrying compartment opening control apparatus each have an oscillator circuit, an antenna, and a frequency...
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5705987 |
Circuit for controlling operation of a load after a predetermined time delay
A circuit for controlling operation of a load, such as an alarm circuit in a fire protection system, in which operation of the load is delayed for an adjustable time period. The load control...
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5705988 |
Photoelectric smoke detector with count based A/D and D/A converter
A method and apparatus in a smoke detector for comparing an analog signal voltage to a digital alarm threshold and for converting a digital sensitivity value to an analog test voltage. The analog...
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5572190 |
Batteryless sensor used in security applications
A batteryless sensor includes either a micro miniature generator/gear train or a piezoelectric crystal to convert a movement of a door or window to an ersatz V cc transient power supply to radiate...
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5406256 |
Remote sensor and motion alarm system
A motion detector having a motion sensitive switch, timing circuit, encoder and radio-transmitting circuit in a housing which may be affixed to a remotely-positioned article; and a decoding and...
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5086293 |
Line interruption supervisory device for a fire alarm system
A line interruption supervisory device for a fire alarm system is capable of reliably carrying out the line supervision even if the line length is long and/or there is a large number of connected...
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4954805 |
Piezo electronic horn
The invention provides an electronic horn for an alarm circuits of the type in which the d.c. power supply for the horn will be of a particular polarity to indicate an alarm condition. The circuit...
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4870405 |
Object monitoring and alarm device
An object that is ordinarily held within a receptacle, such as a pen, is monitored to sense removal of the object from the receptacle. Removal of the object initiates a timing cycle. At the...
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4849740 |
Safety device for a sheet cutter apparatus
A sheet cutter apparatus includes circuitry for detecting when the blades of the cutter are in an "open" position with their cutting edges separted from each other, and a timer that is initiated...
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4772879 |
Motion sensing alarm
A motion sensing alarm is disclosed. It is comprised of a time delayed switching circuit connected between a supply circuit and an electronic logic circuit. A triggering circuit is connected...
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4725821 |
Device for generating an alarm signal
A device for generating an alarm signal in the event of an abnormality in the environment of a detector includes a pair of signal/power supply lines, a number of detectors for detecting an...
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4707684 |
Alarm for a refrigerator
An alarm is disclosed herein for providing an indication when a certain condition, such as a door ajar condition of a refrigerator, has existed for a predetermined time. The alarm includes a...
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4567476 |
Method and circuit for optical and/or acoustic indication of the charge state of a battery or a storage battery
The subject of the invention is a circuit for monitoring the charge state of a battery for supplying voltage to an electrical consumer through a mode selector switch which may be switched from an...
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4558307 |
Reminder device
A box formed with an aperture in which a photosensitive cell is secured includes an electronic circuit connected to be fed by the electrical signal produced by the photosensitive cell when the...
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4547768 |
Toilet reservoir fill alarm
A toilet reservoir fill alarm including water level sensors which can be positioned in the water reservoir tank of a flush toilet to detect the presence or absence of water at a desired level. A...
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4538137 |
Fire detector
In a fire detector that includes a sensor for producing an output voltage corresponding to smoke concentration, temperature, etc., there is provided a charge-and-discharge circuit to be reset by...
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4523185 |
Zoned intrusion display with series-connected sensors
A visual display system detects and continuously displays the location of a breach in a protected building or secure area. Each of a plurality of exclusive OR gates is connected to a separate...
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4520351 |
Passive personal alarm device
A passive personal alarm device is activated by release of a spring-loaded button switch which, when held down, opens an otherwise closed circuit. A time delay element in the circuit prevents...
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4513277 |
Low fuel indicator system
A low fuel indicator system 10 for a motor vehicle comprises a light-emitting indicator 12 which is energized or de-energized by an output signal derived from a voltage comparator 14 which receives...
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4479115 |
Fan speed and/or fan failure detector
A pressure transducer, such as a microphone, is placed in proximity to the blades of a fan, such as a fan used to cool electronic equipment. As each blade passes the transducer, a pressure wave is...
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4472715 |
Dual spectrum fire sensor with discriminator
A fire sensor discriminates between fires and the flash caused by a projectile piercing the wall of a protected area. The sensor system comprises first and second radiant energy detectors, each...
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4450351 |
Motion discontinuance detection system and method
A motion detection system is disclosed which utilizes a lens or other imaging device to be responsive to motion in a particular field of view in a room, for example, and pass illumination to a...
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4432041 |
Smoke penetrating emergency light
A self-contained, portable lighting apparatus is disclosed. The apparatus functions as an escape light in conjunction with smoke detector alarms in that it is activated by detecting the sound of...
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4425532 |
Circuit arrangement of a staircase lighting time switch
Circuit arrangement of a staircase lighting time switch offers a possibility of an automatic reduction of the light power of lamps lighting the staircase whereby the user is warned that the time of...
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4242672 |
Patient monitoring system and switch
A switch is placed on a bed, chair, or other object and is maintained in closed condition so long as a patient occupies the bed, chair, or other object and continues to exert sufficient weight on...
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4229733 |
Exposure detecting device
An exposure detecting device comprising a radiation detector means providing an output signal responsive to the intensity of received ultraviolet radiation, a storage means receiving the output...
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4224611 |
Smoke alarm station
A fire alarm system comprises a central control station feeding through a plurality of parallel supply lines a direct current voltage to a corresponding plurality of remote alarm stations. Each...
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4164736 |
Apparatus for disabling an alarm after a predetermined operating period
Apparatus for disabling an alarm after a predetermined operating period employs a relay which is operated by a gate circuit. A contact of the relay applies operating potential to an alarm. An...
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4127847 |
Monitoring system for aircraft master switch
An electrical system for use on aircraft and including a manually operated master switch for connecting a d.c. power supply to a supply bus that feeds electrical equipment on the aircraft....
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4115764 |
Diagnostic system employing a magnetic field responsive apparatus
A current detecting apparatus wherein when a wire is energized, a reed switch comes into operation in response to the magnetic lines of force generated concentrically around the wire to detect the...
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4106003 |
Signal treatment circuit for burglar alarms
In burglar alarms in which ultrasonic waves are transmitted into a protected space and reflected to a receiver which detects disturbances in the reflected waves caused by an intruder to actuate the...
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4106000 |
Anti-theft device with disabling means
A sensing means is connected to the input of an electronic circuit for triggering a signalling means. The electronic circuit includes a continuous differential amplifier whose two inputs (-) and...
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RE29143 |
Fail-safe apparatus for checking the presence of flame in a burner
A control device for monitoring the presence or absence of a flame through the use of an ionization tube sensitive to radiation of a predetermined wavelength and which is emitted by the flame....
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3987425 |
Leakage resistance detector and alarm circuit
The circuit is adaptable for electric apparatus, particularly trolley buses and the like, where the apparatus derives its power from a pair of electric power lines, and the body of the apparatus is...
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3962696 |
Protective systems
A monitoring system for use as an intruder alarm comprises a sensor loop including at least one set of normally-closed contacts. An integrator circuit is coupled to the sensor loop and provides an...
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3889251 |
Photo electric ambiant light operated surveillance device
A surveillance device comprises two photo-sensitive devices arranged to receive light reflected respectively from an eye of the person under survey and from an area of skin adjacent to the eye, a...
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3878540 |
Paper feed stoppage detection means in an electronic photocopying machine
A plurality of sensors detect the passage of a sheet of copying paper through a copying machine. A plurality of storage circuits having set and reset states are associated with the sensors. Each...
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3866204 |
ELECTRONIC MEDICAL WARNING DEVICE
An improvement over the device disclosed in U.S. Pat. No. 3,634,885 consisting of the incorporation into the control circuitry of time delay means serving to delay activation of the message...
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3864674 |
Emergency Radio Warning System
A radio warning system includes emergency condition sensors for actuating respective radio transmitters which are modulated by identification generators to produce identification signals which...
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3857072 |
RELAY RELEASE TIMING CONTROL CIRCUIT
The release characteristics of a relay are controlled to within a small critical range by a circuit which insures that the relay will remain operated for a period of time to bridge valid open...
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3852736 |
BED EGRESS ALARM CIRCUIT
A condition responsive circuit for generating an output signal upon the opening of a switch. An FET draws nominal current when the switch is closed. When the switch is opened the FET conducts to...
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3851322 |
SHORT CIRCUIT MONITOR FOR STATIC INVERTERS AND THE LIKE
In static inverters having means for monitoring the output voltage and output current, a short circuit line monitor is connected thereto and continuously monitors line voltage and line current to...
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3813664 |
APPARATUS FOR SUPERVISING EQUIPMENT WITH WARNING LIGHTS
Apparatus for supervising equipment wherein plural signal paths are provided respectively developing signals indicative of errors in parts of the equipment, having a plurality of warning lights...
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3798631 |
SKIER ALARM SYSTEM
An alarm system for use with ski boats is automatically operated when a water skier releases his grip on the tow line to produce an alarm indicative of "skier down". The system will continue to...
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3797006 |
SAFETY ALARM SYSTEM AND SWITCH
A safety alarm system adapted for placement in a cabinet to monitor uncontrolled entry into the cabinet by sounding an alarm when the door to the cabinet is left opened for more than a...
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3794991 |
ALARM SYSTEM WITH TIMED EXIT CIRCUIT MEANS
An intruder-activated alarm system operating pursuant to the McCullough l principle. The system includes a protected circuit incorporating an exit means-controlled switch. Arming means for the...
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