| 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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| 05/13/1981 | EP0028471A1 Security equipment for providing indication of removal of objects from monitored locations |
| 05/12/1981 | US4267549 Pull station protector |
| 05/12/1981 | US4267505 Failure sensor for a gas detector |
| 05/05/1981 | US4266220 Self-calibrating smoke detector and method |
| 05/05/1981 | US4266219 Supervisory control system for a smoke detector |
| 05/05/1981 | US4266218 Alarm system control circuit |
| 04/08/1981 | EP0026462A2 Method and device for individual alarm identification in intrusion or fire alarm systems |
| 04/08/1981 | EP0026461A2 Circuit arrangement for intrusion or fire alarm systems |
| 04/07/1981 | US4260981 Physical condition monitoring system for detection in remote places |
| 04/01/1981 | EP0025983A2 Arrangement to prevent false alarms by passive infrared-movement signallers |
| 03/03/1981 | US4254410 Pseudo-random pulse line security monitoring system |
| 02/24/1981 | US4253091 Method and apparatus for detection of alarm conditions |
| 02/17/1981 | US4251118 Switching circuit for the disabling of spurious sensor signals |
| 02/03/1981 | US4249166 Line supervision |
| 02/03/1981 | US4249036 Remote alarm installation |
| 02/03/1981 | CA1095147A1 Testable protective system with redundant trip |
| 01/27/1981 | US4247848 Fire detector with a monitor circuit |
| 01/20/1981 | US4246572 Detection circuit with hysteresis |
| 01/20/1981 | CA1094158A1 Battery discriminator circuit for smoke detector |
| 01/07/1981 | EP0021611A1 Security system sensor |
| 01/06/1981 | US4243971 Test circuit for automotive passenger restraint systems |
| 12/23/1980 | US4241335 Automatically supervised alarm system |
| 12/23/1980 | US4241332 Personal security alarm |
| 11/25/1980 | US4236146 Switchless circuit malfunction sensor |
| 11/18/1980 | US4234873 Alarm installation with a number of self powered indicating elements |
| 11/04/1980 | US4232307 Electrical test circuit for optical particle detector |
| 11/04/1980 | US4232306 Supervisory control system and apparatus |
| 10/21/1980 | US4229734 Line supervision |
| 10/01/1980 | EP0016025A1 Conduits protected against sabotage, for security installations and installation thereof within a protection network |
| 09/23/1980 | US4224538 Series supervision/parallel actuation device |
| 09/23/1980 | CA1086428A1 Real time programmable digital register analyser |
| 09/17/1980 | EP0015656A2 Improvements relating to security equipment |
| 09/03/1980 | EP0014714A1 Alarm device partly mobile with protection against failure to operate, breakdown, sabotage and false alarm |
| 09/02/1980 | CA1084849A1 Dynamic sound controller and method therefor |
| 08/26/1980 | US4219806 Dual alarm gas detector |
| 08/26/1980 | CA1084604A1 Four wire multi-satellite intrusion alarm control system with tamper switch |
| 08/19/1980 | US4218677 Detecting loop digital interface circuitry |
| 07/29/1980 | US4215281 Detection circuit and structure therefor |
| 07/22/1980 | US4214227 Instrument panel assembly |
| 07/01/1980 | US4210894 Terminal unit for electrical circuit elements and sensing device employing said terminal unit |
| 06/25/1980 | EP0012280A1 Tamperproof intrusion detector |
| 06/11/1980 | EP0012092A1 Security system |
| 06/11/1980 | EP0011680A1 Malfunction detecting circuit for a safety device actuator used to protect vehicle occupants in the event of a collision |
| 06/03/1980 | US4206490 Electrical detection, safety and selection circuits |
| 06/03/1980 | US4206450 Fire and intrusion security system |
| 06/03/1980 | US4206449 Multiple sensor intrusion alarm system |
| 05/13/1980 | US4203095 Monitoring apparatus for direct wire alarm system |
| 05/06/1980 | US4201982 Four wire multi-satellite intrusion alarm with multiplex annunciation |
| 04/22/1980 | US4199755 Optical smoke detector |
| 04/22/1980 | US4199754 Circuit for an emergency lighting and fire detector system |
| 04/01/1980 | US4196426 Combustion products detection apparatus |
| 03/25/1980 | US4195286 Alarm system having improved false alarm rate and detection reliability |
| 03/18/1980 | US4194191 Smoke simulating test apparatus for smoke detectors |
| 03/11/1980 | US4193069 Latching alarm smoke detector |
| 03/11/1980 | US4193061 Electronic authentication system |
| 03/04/1980 | US4191946 Warning apparatus with a line integrity supervisory circuit |
| 02/20/1980 | EP0008023A1 Security signalling system |
| 02/19/1980 | US4189725 Battery powered condition sensing and display apparatus with low battery indication |
| 02/12/1980 | CA1071731A1 Apparatus for supervising leads interconnecting a plurality of self-contained abnormal condition sensing and alarm annunciating units |
| 02/05/1980 | US4187465 Device for protection against transmission errors in an information transmission system |
| 01/22/1980 | US4185277 Trip alarm circuit |
| 01/22/1980 | CA1070408A1 Double-detecting loop type alarm system |
| 01/10/1980 | WO1980000044A1 Conduits protected against sabotage,for security installations and installation thereof within a protection network |
| 12/25/1979 | US4180742 Detector with supervisory signal from monitor cell |
| 11/15/1979 | WO1979000902A1 Alarm device partly mobile with protection against failure to operate,breakdown,sabotage and false alarm |
| 11/14/1979 | EP0005352A1 Radiation detection intruder alarm apparatus |
| 11/01/1979 | WO1979000844A1 An arrangement for security systems |
| 10/02/1979 | US4170004 Device for monitoring the serviceability of optical indicators |
| 10/02/1979 | CA1063708A1 Instrument panel assembly |
| 09/18/1979 | US4168496 Quasi-stationary noise cancellation system |
| 09/18/1979 | CA1062792A1 Central station system transmission apparatus |
| 09/11/1979 | US4167733 Tamper-proof security alarm system |
| 09/05/1979 | EP0003762A1 Fire detector with a monitor circuit |
| 08/21/1979 | CA1061016A1 Smoke sensing fire alarm |
| 08/07/1979 | US4163968 Supervised loop alarm radio transmitter system |
| 08/07/1979 | US4163936 Audible tester for alarm circuits |
| 07/17/1979 | US4161721 Alarm device having code verification system |
| 05/15/1979 | US4155081 Rechargeable battery backup power source for an ionization smoke detector device |
| 05/15/1979 | US4154189 Manual release and test apparatus for alarm system |
| 05/01/1979 | USRE29983 Self-monitoring battery operated circuit |
| 04/24/1979 | US4151522 Count discriminating fire detection system |
| 04/17/1979 | US4150369 Intrusion alarm system |
| 04/10/1979 | US4149162 Battery discriminator circuit for smoke detectors |
| 03/13/1979 | US4144459 Smoke detector with test means for simulating a predetermined percentage of smoke |
| 03/13/1979 | US4144458 Smoke detector with test means for simulating a predetermined concentration of smoke |
| 03/06/1979 | CA1050116A1 Technique or monitoring the operational integrity of remote analog circuits |
| 02/27/1979 | US4142219 Two-wire system including signal receiving section and detection section with protected relay |
| 02/20/1979 | US4141007 Central alarm conditioning detecting and alerting system |
| 02/20/1979 | CA1049112A1 Alarm control device |
| 02/13/1979 | US4139846 Method and apparatus for supervising battery energy level |
| 02/06/1979 | US4138674 Four wire multi-satellite intrusion alarm control system with tamper switch |
| 02/06/1979 | US4138670 A.C. powered detecting device with battery backup |
| 02/06/1979 | US4138664 Warning device |
| 01/30/1979 | US4137526 Alarm zone disabling control circuit |
| 01/02/1979 | CA1045692A1 Optical smoke detector improvements |
| 10/03/1978 | US4118688 Confidence check circuit for built-in test systems |
| 09/26/1978 | US4117467 Tamper resistant alarm annunciator |
| 07/25/1978 | US4103299 Two-wire pilot device solid state control system |
| 07/18/1978 | US4101875 Multi-satellite intrusion alarm control system |
| 07/18/1978 | US4101872 Fire detection system |