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| Number | Title | Issue Date |
| 4358764 | Coupling unit for coaxial cable including means for radiating wave energy An optimum coupling unit for joining adjacent sections of coaxial cable and a coupled radiating antenna includes different diameters of the dielectric material, different diameters of central conductor and different values of the dielectric constant mater... | 11/09/1982 |
| 4327358 | Physical deterrent barrier with upward looking detection sensor for intruder detection system A physical deterrent barrier is utilized as an integral part of an intruder detection sensor that provides surveillance of intrusions in the air space over the barrier. The sensor is a corner reflecting antenna that is coextensive with and mounts on the t... | 04/27/1982 |
| 4319332 | Method and apparatus for space monitoring by means of pulsed directional beam A monitoring method and apparatus is disclosed for monitoring surfaces and spaces as well as objects present therein. A pulse transmitter delivers, by means of a beam deflection element, in a defined sequence and in defined directions pulsed directional b... | 03/09/1982 |
| 4318102 | Intrusion detection system having look-up sensor instrumentation for intrusion range and altitude measurements Range and elevation measurement ambiguities in upward looking intruder detection systems are eliminated by look-up sensor instrumentation that utilizes monostatic and bistatic radar principles. Intruder detection systems that have the capability of monito... | 03/02/1982 |
| 4213123 | Integral enable-disable means for guided wave radar intrusion detector system portals The intrusion detection capability of a guided wave radar intrusion detection system is selectively disabled in certain areas, such as gates or portals to permit ingress and egress of personnel and vehicles without affecting overall system performance and... | 07/15/1980 |
| 4200870 | Microwave components A microwave transmitter/receiver unit consisting of a hollow waveguide member closed at one end and open at the other is divided longitudinally by an internal dividing plate into two waveguides, one for transmitting microwave radiation to the open end and... | 04/29/1980 |
| 4197537 | Intruder detection system A microwave radar type of intruder detection system incorporating signal sensing, storing and comparison logic which enables the system to self-adapt to any preselected environment and produce a signal in the event of a predetermined change from the ambie... | 04/08/1980 |
| 4191953 | Intrusion sensor and aerial therefor Perimeter protection in a security installation is achieved by detecting disturbances in a microwave beam sent from a transmitter to a receiver. The transmitter and receiver have associated beam antennas of extended vertical aperture of not less than 0.75... | 03/04/1980 |
| 4166973 | Method and system for detection of thin metal layers in packaged articles Metal layers of extreme thinness, of the order of fifty Angstroms and greater are detected by use of microwave energy so propagated as to permit determination of the presence or absence of the metal in a detection zone of limited extent outwardly of the i... | 09/04/1979 |
| 4149157 | Receiver for a HF-intrusion detection system A receiver in which the detection sensitivity of a detection diode is adjustable as a function of the polarization current, and is controlled by means of a feedback circuit provided with a delay element so that changes in the received signals having a fre... | 04/10/1979 |
| 4135185 | RF loop intruder detection system An RF intruder system utilizes two concentric loops of wire spaced apart for a predetermined magnitude, either of which can transmit and/or receive electromagnetic energy. This area within the loops are to be protected against intrusion. Without intrusion... | 01/16/1979 |
| 4134110 | Transceiver with skewed transducers for low close-in sensitivity An intruder detection transceiver in which close-in sensitivity is reduced or eliminated to alleviate false alarm problems. An ultrasonic or microwave transceiver contains a transmitter and receiver for transmitting and receiving signals for intruder dete... | 01/09/1979 |
| 4132988 | Radar intrusion detection system A radar intrusion detection system for isolated resources uses only one bistatic radar in combination with multiple passive reflectors to define the zone to be protected. Any intruder crossing a boundary of the zone within which is located the isolated re... | 01/02/1979 |
| 4124848 | Range limited area protection system A system for detecting intruder motion in selectable zones of a defined area is disclosed. The system is principally used as a line protector to detect intruders in the vicinity of a fence or wall and may be used as a virtual fence by employing a narrow-b... | 11/07/1978 |
| 4123748 | Burglar alarms utilizing ultrasonic waves Burglar alarms utilizing ultrasonic waves in which ultrasonic waves transmitted from a wave transmitting oscillator are reflected by such objects as doors, windows, floors, walls, etc. and such reflected ultrasonic waves will be received by a wave receivi... | 10/31/1978 |
| 4120389 | Proximity sensor An energy curtain is formed by exciting high order beam modes in an open resonant cavity. Depending on mode number, the energy resonates in a mathematically determined pattern. A detector senses changes in the resonant condition caused by the presence of ... | 10/17/1978 |
| 4112419 | Apparatus for detecting the number of objects Apparatus for detecting the number of objects such as persons in which at least one ultrasonic wave signal transmitter-receiver is used to transmit ultrasonic wave signals toward objects the number of which is to be detected, and to process waves reflecte... | 09/05/1978 |
| 4109233 | Proximity sensor An energy curtain is formed by exciting high order beam modes in an open resonant cavity. Depending on mode number, the energy resonates in a mathematically determined pattern. A detector senses changes in the resonant condition caused by the presence of ... | 08/22/1978 |
| 4087814 | Intruder alarm systems Intruder alarm apparatus includes two detector systems each responsive to the presence of an intruder within a portion at least of a protected area and alarm means responsive to the actuation of the detectors in a predetermined logic or time sequence for ... | 05/02/1978 |
| 4086586 | Closed space integrity To supervise the integrity of an enclosed space one terminal of an ultrasonic transmission link is placed inside the space, and the other terminal outside, so that any breach of the walls enclosing the space causes an increase in the received ultrasonic i... | 04/25/1978 |
| 4079361 | Intrusion sensor and aerial therefor Perimeter protection in a security installation is achieved by detecting disturbances in a microwave beam sent from a transmitter to a receiver. The transmitter and receiver have associated beam antennas of extended vertical aperture of not less than 0.75... | 03/14/1978 |
| 4072941 | Underwater monitoring Apparatus for detecting the presence of an underwater object measures variations in the input impedance of a monopole antenna to provide data on the object. A sweep generator supplies a first electrical signal of varying frequency for transmission as an e... | 02/07/1978 |
| 4028690 | Intruder detection device To prevent unintentional alarm initiation in an intruder detection system of the kind in which a transmitter emits radio waves across an area to be monitored and a receiver senses changes in the resultant signal, which initiation might otherwise occur as ... | 06/07/1977 |
| 4026654 | System for detecting the presence of a possibly moving object A system for detecting the distance L between two objects A and B, either or both of which may be in motion, comprising approach detector means and proximity detector means operational within overlapping distance ranges; each detector means includes an em... | 05/31/1977 |
| 4027303 | Apparatus for detecting the presence of objects by sensing reflected energy Apparatus for detecting the presence of an object by propagating an electromagnetic field, preferably in the microwave range. An object entering the path of the electromagnetic field reflects, disturbs or interrupts electromagnetic energy. The level of th... | 05/31/1977 |
| 4016529 | Body detecting device A device for detecting a body comprises transmitter means, receiver means for receiving the signal from the transmitter means, means for setting the level of a reference signal by the reception signal from the receiver means provided when the body is in a... | 04/05/1977 |
| 3974328 | Line scan area signature detection system An area signature detection system arranged to receive an output from a sensor operative in the electromagnetic spectrum, where the output from the sensor is an amplitude varying electrical signal representing the field-of-view beheld by the sensor, and t... | 08/10/1976 |
| 3961321 | Omnidirectional ultrasonic intrusion surveillance unit An omnidirectional ultrasonic intrusion surveillance unit can be suspended or supported in a room or like closed environment so that there is space substantially all round the unit, permitting surveillance all around the unit, that is, over substantially ... | 06/01/1976 |
| 3955050 | System for audibly recognizing an aurally unclassifiable signal This invention relates to a system for audibly recognizing a received signal aurally unclassifiable because of its improper (not clearly bearable) time duration and/or the frequency band occupied thereby. The received signal may be a carrier wave, modulat... | 05/04/1976 |
| 3945005 | Surveillance radar 1. In a radar apparatus having a pulsed transmitter source of linearly poized radio-frequency energy, a duplexer, a receiver, and a directional antenna system including a rotatable dipole antenna for radiating linearly polarized radio-frequency energy, m... | 03/16/1976 |
| 3943503 | Electronic intruder alarm apparatus A radio-frequency source irradiates a space within which an intruder is to be detected, this space being illuminated by fluorescent tubes. Successive peak levels in the returned signals are compared and a fall in the peak amplitude results in a comparator... | 03/09/1976 |
