| Patents for G08B 29 - Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation (6,872) |
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| 01/02/1992 | EP0463339A2 Device for fail-safe testing of an infrared detector unit |
| 12/31/1991 | US5077548 Dual technology intruder detection system with sensitivity adjustment after "default" |
| 12/27/1991 | EP0462442A1 Method of preventing arming of an intruder alarm device |
| 12/24/1991 | US5075670 Personnel monitoring tag with tamper detection and secure reset |
| 12/17/1991 | CA1293308C Supervision arrangment for smoke detectors |
| 11/28/1991 | DE4113503C1 Evaluation circuit for laser warning detector - with alarm signal supplied only when pulse length is beneath given value |
| 11/13/1991 | EP0456080A2 Indication method and circuit of different input signals |
| 11/12/1991 | US5065150 Monitoring apparatus for disaster prevention |
| 11/05/1991 | US5063374 Simultaneous signal devices testing in response to periodic function of an operating device in a system |
| 10/30/1991 | EP0453957A2 Remote-control home electronics device |
| 10/29/1991 | US5060508 Gas sample chamber |
| 10/22/1991 | US5060300 Receiver switchable between network supply mode and power-conserving battery supply mode |
| 10/20/1991 | CA2014987A1 Visual alarm system and circuitry |
| 10/15/1991 | US5057817 Intruder detection system with passive self-supervision |
| 10/15/1991 | US5057816 Multizone intruder detection system with forced walk-test |
| 10/08/1991 | US5055830 Battery sensing mechanism |
| 10/02/1991 | EP0449683A1 Method of setting an anti-break in, anti-theft system in particular for motor vehicles |
| 10/01/1991 | US5053752 Smoke detector and method using elongated flexible low battery condition indicator member |
| 09/25/1991 | CN1054873A Simulative interference video signals generator |
| 09/18/1991 | CN1054693A Continous cipher synchronization for cellular communication system |
| 09/11/1991 | EP0446194A1 Continous cipher synchronization for cellular communication system |
| 09/11/1991 | EP0445346A1 Battery missing indicator |
| 09/10/1991 | CA2035371A1 Improperly inserted battery detector |
| 09/08/1991 | WO1991014315A1 Continuous cipher synchronization for cellular communication system |
| 09/04/1991 | CN2084221U Tester for circuit break of fire automatic alarm system |
| 09/03/1991 | US5046127 Transmission path tester for broadcasting |
| 09/03/1991 | US5045840 Device for sensing continuity in a circuit having an open circuited apparatus |
| 08/22/1991 | DE4005169A1 MOvement detector using IR sensor - converts sensor signals into digitally processed signals handled by microprocessor |
| 08/13/1991 | US5039985 Paging apparatus with improved message display function |
| 08/08/1991 | DE4014080C1 Antitheft device preventing injection of foam in siren housing - has movable wall part(s) operating alarm switch |
| 07/17/1991 | EP0436538A1 Security system for an environment |
| 07/16/1991 | US5032823 Secure personnel monitoring system |
| 07/09/1991 | US5030941 Electronic article surveillance system incorporating an auxiliary sensor |
| 07/03/1991 | EP0435198A2 Electronic article surveillance system incorporating an auxiliary sensor |
| 06/28/1991 | CA2032945A1 Electronic article surveillance system incorporating an auxiliary sensor |
| 06/27/1991 | WO1991009391A1 Control system for fire alarm installations with peripheral fire protection devices and a central fire alarm system |
| 06/25/1991 | US5027383 Supervised, interactive alarm reporting system |
| 06/25/1991 | US5026992 Spectral ratioing technique for NDIR gas analysis using a differential temperature source |
| 06/20/1991 | DE3941109A1 Steuerungssystem Control system |
| 05/28/1991 | US5019803 Detector units |
| 05/28/1991 | US5019802 Intrusion detection apparatus |
| 05/21/1991 | US5017910 Intermittent fault detection system |
| 05/21/1991 | US5017906 Apparatus and method for combining analog detection signals to provide enhanced alarm integrity |
| 05/02/1991 | WO1991006080A1 A stopping smoke alarm watch |
| 04/24/1991 | EP0423489A1 Smoke detection arrangement with monitoring |
| 04/16/1991 | US5008840 Multi-zone microprocessor fire control apparatus |
| 04/16/1991 | US5008655 Visual alarm device interconnectable to existing monitoring circuitry |
| 04/16/1991 | US5008559 Method for operating an optical smoke detector and optical smoke detector for the method |
| 04/10/1991 | EP0420952A1 Maintenance monitoring system |
| 04/10/1991 | EP0420836A1 Improved monitoring methodology. |
| 04/02/1991 | US5005187 Remote control |
| 04/02/1991 | CA1282471C Testing device for fire detectors |
| 03/27/1991 | EP0419347A1 Protection system, especially for motor vehicles, of type comprising an apparatus such as an electronic control device of an alarm arragement |
| 03/27/1991 | EP0418411A1 Fire alarm system with a combination sounder |
| 03/27/1991 | EP0418410A1 Method and device for compensating the air humidity in an optical smoke alarm |
| 03/27/1991 | EP0418409A1 Method and device to avoid prevailing weather effects on automatic fire alarms |
| 03/26/1991 | US5003294 Remote infra-red personal alarm system |
| 03/26/1991 | US5003290 Integrated alarm and access control system |
| 03/06/1991 | EP0415621A2 Communication system for single point emergency lighting |
| 03/01/1991 | CA2020090A1 Communication system for single point emergency lighting |
| 02/27/1991 | EP0414142A2 Monitoring and controlling system and method of acquisition of random errors |
| 02/26/1991 | US4996519 Method and apparatus for monitoring an amplifier |
| 02/26/1991 | CA1280814C Integrity securing monitor and method for a security installation |
| 02/06/1991 | EP0411234A1 Electronic system for automatic surveillance |
| 02/05/1991 | US4990896 Light responsive device for monitoring on-line indicator lights |
| 02/05/1991 | US4990895 Method and apparatus for testing photoelectric circuits |
| 02/05/1991 | US4990888 Unitary alarm sensor and communication package for security alarm system |
| 01/22/1991 | US4987594 Stand-alone utility device with antitheft code with method for its use |
| 01/10/1991 | WO1991000659A1 Optoelectronic test apparatus for communicating with a receiver |
| 01/02/1991 | EP0405247A1 Line interruption supervisory device for fire alarm systems |
| 01/01/1991 | US4982094 Passive type crime-preventing infrared sensor provided with a mechanism of monitoring an obstruction for the visual field |
| 12/19/1990 | EP0402539A1 Detector units |
| 12/13/1990 | DE3918592A1 Device drawing attention to abuse of emergency control - has electronic alarm trigger concealed in rupturable portion of cover which carries warning against non-emergency use |
| 12/12/1990 | CA2018034A1 Battery sensing mechanism |
| 12/11/1990 | US4977353 Communication system for single point emergency lighting |
| 12/04/1990 | US4975683 Cosmic radiation fault detection system |
| 11/27/1990 | US4973943 Signal control system using two synchronous ring counter circuits |
| 11/20/1990 | US4972181 A. C. powered smoke detector with back-up battery supervision circuit |
| 11/01/1990 | WO1990013189A1 Low battery indicator |
| 11/01/1990 | CA2013611A1 Continuity-isolation testing for class a wiring in fire alarm system |
| 10/23/1990 | US4965556 Combustion products detector having self-actuated periodic testing signal |
| 10/18/1990 | WO1990012375A1 Maintenance monitoring system |
| 10/10/1990 | EP0391240A1 Failure detecting circuit with alarm and acknowledging switch |
| 10/09/1990 | US4962373 Scheme for power conservation in fire alarm system |
| 10/09/1990 | US4962368 Reliability and workability test apparatus for an environmental monitoring system |
| 09/27/1990 | DE3909073A1 Method and circuit arrangement for continuous fail-safe testing of an infrared sensor device |
| 09/25/1990 | US4959640 Apparatus for detect missing battery in smoke detector |
| 09/19/1990 | EP0388352A1 One way light barrier arrangement |
| 09/11/1990 | US4956637 System for detecting irregular operation of switch state verification circuit |
| 09/04/1990 | US4954809 Continuity-isolation testing for class A wiring in fire alarm system |
| 09/04/1990 | CA1273688A1 Diagnosis switch |
| 08/29/1990 | EP0384209A2 Method for the operation of an ionization smoke detector, and ionization smoke detector |
| 08/28/1990 | US4952913 Tag for use with personnel monitoring system |
| 08/23/1990 | WO1990009714A1 Supervised, interactive alarm reporting system |
| 08/21/1990 | US4951249 Method and apparatus for controlled access to a computer system |
| 07/18/1990 | CN1008842B Security monitoring system |
| 07/17/1990 | US4942386 Integrated impact detection and alarm system |
| 07/17/1990 | US4942385 Photoelectric intrusion detector |
| 07/03/1990 | CA1271248A1 Surveillance system |
| 06/27/1990 | EP0375270A2 Radiation detection arrangements and methods |