Matches 251 - 300 out of 523 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
5450062 Detection system with reduced sensitivity to pin diode effect  
An intrusion detection system, including a microwave device and a light emitting diode, is controlled to alternate their operation so the diode is off and not conducting when the microwave is...
5448223 Currency alarm pack having receiver automatic gain hysteresis  
A currency alarm pack for triggering an alarm to foil a bank robbery consists of a receiver for detecting an electromagnetic field at the exit of a bank and a circuit which activates an alarm to...
5446445 Mobile detection system  
A mobile detection system for detecting a fire, gas leak, intruder, or other abnormal condition in a house or an office, and for alerting a central monitor, fire station, police station, or an...
5444432 Detection signal evaluation at varying signal levels  
An arrangement and method for processing signals from infrared intrusion detectors is disclosed which allows the signal to be processed at different amplitude levels to recognize different signal...
5424723 Apparatus and methods for checking the presence of yarns on a textile machine  
The presence of yarns of a tentered yarn layer on a textile machine is checked by traversing a feeler transversely across a row of the threads to deflect the yarns. A pressure sensor of the feeler...
5418522 System for indicating and signaling the presence of snow and ice  
A moisture sensor with two heatable concentric moisture electrodes and a temperature sensor detecting the electrode temperature is set into the roadway surface to be monitored. The moisture...
5416725 Computer-based notification system having redundant sensor alarm determination and associated computer-implemented method for issuing notification of events  
A notification system for reporting events occurring within a defined area being monitored thereby. The notification system includes a plurality of sensors installed at selected locations within...
5410295 Anti-theft system for currency stored in a vault  
An anti-theft system for an automatic teller machine (ATM) causes a currency alarm pack to deface the currency supply in the event that an attempt is made to transport the entire ATM. When the...
5406255 Duplexed communication system  
A communication system comprising at least one working system for receiving a signal from a source, at least one protection system for receiving the signal from the source, a detection part for...
5396220 Storm warning system  
A lightning and storm warning system capable of distinguishing lightning flashes from other light flashes and indicating to an operator of the existence of a lightning flash even under high ambient...
5386210 Method and apparatus for detecting entry  
A sensing apparatus and method for use in an illumination control monitoring of a particular area. The sensing apparatus includes selectable and independent triggering and retriggering modes for...
5382943 Remote monitoring unit  
A remote monitoring apparatus includes a camera for producing a video signal from a picture of a remote site location being monitored, an image processor for outputting an image signal through an...
5376924 Fire sensor  
A fire sensing method and apparatus for detecting a fire based on the detection of a hydrocarbon gas produced before fire ignition and the detection of a second fire indicating phenomenon. Such...
5376927 Programmable fluid detector with pressure probe discriminator  
A hydrocarbon leak detection system has a microprocessor based controller for receiving inputs from transducers and comparing the inputs against stored decision criteria to determine if...
5376919 Vehicle intrusion detector  
A vehicle detector is disclosed wherein either a glass breakage signal or a door opening signal causes an alarm. The glass breakage signal is caused by the detection of high audio frequency...
RE34788 Pressure change intrusion detector  
Apparatus utilizing change in pressure condition in an area to be protected to indicate intrusion or change in conditions of the area by using a pressure detection device to detect pressure waves...
5365218 System for guarding property including a mobile laser unit  
Buildings, vehicles, and persons are protected by means of a laser monitoring device consisting of a laser transmitter and receiver and an associated evaluation unit. A platform with a variably...
5349329 Vehicle security apparatus and method  
An anti-theft apparatus to prevent "car jacking" includes a transmitter carried by the driver and a receiver and a switch circuit installed in the vehicle such that, when the receiver fails to...
5331312 Obstacle-detecting apparatus  
This device can detect an obstacle in a railroad crossing or similar setting by way of image processing independently of a height and a width of an obstacle. The image data read from a video,...
5331308 Automatically adjustable and self-testing dual technology intrusion detection system for minimizing false alarms  
A dual sensor intrusion detection system utilizes adaptive sensor detection techniques to reduce false alarms. The adaptive sensor detection techniques include increasing the stability of one...
5325086 Wave responsive alarm for swimming pool  
A safety device which is responsive to excessive wave motion of a body of water includes a housing having a pivotable telescoping arm connected thereto. A pair of spaced apart probes are mounted on...
5307047 Emergency ring  
This is a ring fitted with a device that sounds an alarm during times of emergencies. The special features of the ring are a transmission circuit and alarm device that emits a sound enclosed in the...
5276427 Auto-adjust motion detection system  
An improved dual sensor motion detection system is disclosed wherein the sensitivity of at least one of the sensors is adjusted in accordance with the response signals or signal history received...
5270947 Fluid status detection system  
A fluid status detection system includes a plurality of probes connected to a controller capable of being operated in a plurality of different operation modes. The controller includes a display and...
5264834 Power equipment warning device  
A safety message announcing device is interconnected to a machine so as to make the machine inoperative until the safety message has been announced. A control signal is provided along with the...
5260687 Combined method of determining fires  
First sensors measure physical quantities correlated with the heat release value of a fire source, and second sensors measure physical quantities correlated with the amount of the product of...
5229753 Warning device for a washing apparatus which advises whether its contents are clean or soiled  
An indicating system for a washing device having has at least one rack for holding articles during the washing of same and a door for gaining access to the articles. The indicating system includes...
5216410 Intrusion alarm sensing unit  
The present invention is directed to an intrusion detection system having two different types of motion sensors and processing of the signals produced by the motion sensors in a manner to provide a...
5202661 Method and system for fusing data from fixed and mobile security sensors  
A system for detecting intrusion into a secured environment using both fixed and mobile intrusion detectors includes a multiplicity of fixed intrusion detection sensors are each deployed at...
5194848 Intrusion detection apparatus having multiple channel signal processing  
Intrusion detection apparatus for use in perimeter security systems and the like is provided with multiple channel signal processing. Each signal processor includes a bandpass filter whose passband...
5189393 Dual technology motion sensor  
A dual technology sensor which uses both ultrasonic and infrared sensors is disclosed. The electronic circuit of the invention requires detection by both sensors to activate the load. Thus, false...
5181010 Automotive security system with discrimination between tampering and attack  
A vehicle security system provided with a plurality of environmentally sensitive sensors determines the number of environmentally sensitive sensors that are activated, and generates an attack alarm...
5173932 Security system comprising a signal transmitter  
A security system comprises a signal transmitter (1) with a first sensor (2) for conveying status information to a receiver (3) via a telecommunication channel (4), the signal transmitter being...
5164703 Audio intrusion detection system  
A supervisory circuit for use with an audio intrusion detection system is disclosed. The supervisory circuit periodically generates an audio test signal which is supplied to a sounder which emits...
5153560 Apparatus for detecting presence of person inside room having door  
An apparatus for detecting the presence of a person or persons inside a room having a door. The apparatus comprises a pyroelectric infrared sensor and a piezoelectric air pressure sensor. The...
5119877 Explosion suppression system  
An explosion suppression system and triggering apparatus therefor are provided for quenching gas and dust explosions. An electrically actuated suppression mechanism which dispenses an extinguishing...
5113174 Device for giving alarm for failure to draw out key for vehicle  
This invention relates to a device for giving an alarm for failure to draw out an engine key for a vehicle. A key cylinder lock comprises an outer tubular member, and an inner tubular member...
5109216 Portable intrusion alarm  
An intrusion alarm system, for an enclosed space responsive to first frequencies in the one to two Hertz range for detecting opening of doors or windows; and responsive to second frequencies in the...
5107249 Intrusion detection system having improved immunity to false alarm  
A multi-sensor intrusion detection system having improved immunity to false alarm is disclosed. The sensor being less susceptible to the generation of false alarm has its output signal processed...
5093656 Active supervision of motion-detection systems  
A microwave motion-detection system incorporates apparatus for actively supervising the operability of the entire microwave system, from the transceiver component, through the output of its signal...
RE33824 Fault detecting intrusion detection device  
In an improved intrusion detection device system of the dual-sensor type, wherein one sensor is a PIR sensor and the other is a microwave sensor, the improvement comprises counting the detection of...
5083106 Intruder detection system with programmable countdown timer for self-supervision  
An intruder detection system includes a self-supervision feature which, on the basis of detecting authorized pedestrian traffic within a region under surveillance, alerts the system user of...
5083109 Rotating source verification device  
A device for monitoring and verifying the operation of a rotating source, such as a rotating civil defense-type siren being tested by sounding the siren for a short period of time, employs a sensor...
5077548 Dual technology intruder detection system with sensitivity adjustment after "default"  
A dual-tech intruder detection system includes a pair of intruder-detecting subsystems, each functioning to detect intrusion by a technology different from the other, and apparatus for activating...
5068643 Burglarproof device  
A theft prevention device includes an optical sensor for detecting a level of ambient light and a vibration sensor for detecting a vibration of a protected article. The theft prevention device...
5061916 Event driven remote graphical reporting of building automation system parameters  
A system and method for reporting of alarms (or other conditions) to a remote location, in a building automation system. The alarm is reported in graphical format which shows not only the...
5030941 Electronic article surveillance system incorporating an auxiliary sensor  
To reduce the occurrence of false alarms, the disclosed system incorporates an auxiliary sensor for detecting the presence of a shopper passing through the electronic article surveillance device,...
5030942 Process and device for measuring and indicating load conditions in drivelines of agricultural implements  
During monitoring of the driveline of an agricultural implement in respect of overloading and the degree of loading, from a first occurrence of slip, the slip revolutions occurring during a...
5025249 Pixel lookup in multiple variably-sized hardware virtual colormaps in a computer video graphics system  
This invention adds a window dependent base value to the pixel values read from a frame buffer or other source of pixel values. The base value points to the base of the colormap for that window,...
5023593 Passive infrared/acoustic pool security system  
A pool security system incorporates a passive infrared element and an underwater acoustic element. The passive infrared detection element generates a thin infrared layer which overlays the entire...
Matches 251 - 300 out of 523 < 1 2 3 4 5 6 7 8 9 10 11 >