| 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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| 07/04/1978 | US4099178 Test means for light responsive smoke detector |
| 06/27/1978 | US4097850 Means for adjusting and for testing a detecting device |
| 06/06/1978 | US4093867 Apparatus for automatically calibrating and testing smoke detectors |
| 05/30/1978 | US4092641 Security interlock switch system for smoke detectors and the like |
| 05/23/1978 | US4091363 Self-contained fire detector with interconnection circuitry |
| 05/09/1978 | US4088989 Intrusion detection apparatus |
| 05/09/1978 | US4088986 Smoke, fire and gas alarm with remote sensing, back-up emergency power, and system self monitoring |
| 04/25/1978 | US4086574 Fire detection system |
| 04/25/1978 | US4086573 Alarm control device |
| 04/04/1978 | US4083039 Voltage enhancement circuit for central station monitored alarm systems |
| 04/04/1978 | US4083037 Detection circuit |
| 03/14/1978 | USRE29580 Integrated fully supervised fire alarm system |
| 01/10/1978 | US4068105 Central station system transmission apparatus |
| 12/27/1977 | US4065759 Smoke detector |
| 12/20/1977 | US4064509 Intrusion detection systems employing automatic sensitivity adjustments |
| 12/20/1977 | US4064507 Noise generator circuit for a security system |
| 11/29/1977 | US4060803 Security alarm system with audio monitoring capability |
| 11/29/1977 | US4060716 Method and apparatus for automatic abnormal events monitor in operating plants |
| 11/22/1977 | US4059843 Overload and ground fault protective device |
| 11/22/1977 | US4059739 Electrical power receptacle having built-in switching contacts |
| 11/01/1977 | US4056815 Battery operated transmitter circuit |
| 10/11/1977 | US4053785 Optical smoke detector with smoke effect simulating means |
| 09/13/1977 | US4048621 Coding system for an alarm system and the like |
| 08/23/1977 | US4044351 System monitor with innate line security ability |
| 08/02/1977 | US4039814 Real time programmable digital register analyser |
| 07/19/1977 | US4037222 Supervision of transducers |
| 07/19/1977 | US4037220 Circuit arrangement for monitoring interruptions in two closed-circuit loops |
| 07/05/1977 | US4034369 Check circuit for checking vehicle warning system |
| 06/28/1977 | US4032916 Intrusion alarm cable supervision system |
| 06/28/1977 | US4032909 Arrangement for testing an alarm system and method |
| 05/17/1977 | US4024519 Intrusion alarm test system |
| 05/10/1977 | US4023163 High security alarm transmission system |
| 05/03/1977 | US4021796 Pushbutton purmutation code control means for a security alarm system |
| 04/26/1977 | US4020479 Fire detector |
| 04/12/1977 | US4017852 Apparatus for supervising leads interconnecting a plurality of self-contained abnormal condition sensing and alarm annunciating units |
| 04/05/1977 | US4016360 System for remotely checking equipment |
| 03/22/1977 | US4013947 Central coupler for a centralized monitor system for motor vehicles |
| 03/15/1977 | US4012728 Back up alarm system |
| 02/01/1977 | US4006448 Centralized monitor system for motor vehicles |
| 01/18/1977 | US4003314 Ski lift monitoring |
| 01/11/1977 | US4003039 Optical fire detection system |
| 01/04/1977 | US4001819 Alarm system for combined hazard detections |
| 01/04/1977 | US4001654 Testable protective system |
| 12/14/1976 | US3997890 Alarm system with supervisory system to detect severing or bridging of detection switches |
| 11/09/1976 | US3991362 Technique for monitoring the operational integrity of remote analog circuits |
| 11/02/1976 | US3990075 Solid state security system |
| 10/26/1976 | US3988725 Detector system |
| 10/12/1976 | US3986184 Method and apparatus for deterring false alarms |
| 09/28/1976 | US3983554 Electric power distribution system including a Master Annunicator and Central Control Unit |
| 09/28/1976 | US3983548 Fire detection system |
| 09/28/1976 | US3983338 Apparatus and method to test the condition of an electrical service line and to determine the presence and/or removal of electrical equipment connected to the line |
| 09/21/1976 | US3982242 McCulloh receiver |
| 08/31/1976 | US3978479 Solid state security system |
| 08/31/1976 | US3978478 Reset circuit for a security system |
| 08/31/1976 | US3978477 Automatic test sequence circuit for a security system |
| 08/31/1976 | US3978476 Circuit conduction test arrangement for emergency alarm systems |
| 08/31/1976 | US3978475 Trouble indicator circuit for a security system |
| 08/31/1976 | US3978461 Three wire detection circuit |
| 08/10/1976 | US3974492 Alarm system |
| 08/10/1976 | US3974488 Margin test switch for photoelectric intruder detection devices |
| 08/03/1976 | US3973257 Apparatus for detecting changes in the electrical characteristics of sensor devices |
| 07/27/1976 | US3971333 Activation indicator for a fire detector |
| 07/20/1976 | USRE28915 Detection of products of combustion |
| 07/20/1976 | US3970846 Presence detecting system with self-checking |
| 07/06/1976 | US3968436 Apparatus for testing the operability of emergency vehicular radio transmitters |
| 06/15/1976 | US3964057 Fire alarm and protection booth |
| 06/01/1976 | US3961322 Real time signal discrimination circuitry |
| 05/04/1976 | US3955183 Alarm condition sensing and indicating circuit with test capability |
| 04/20/1976 | US3952294 Smoke detection alarm system |
| 03/16/1976 | US3944934 False triggering prevention circuit |
| 01/20/1976 | USRE28692 Monitoring apparatus and method for electrical protection systems |
| 01/13/1976 | US3932870 On-line test circuit for intrusion alarm systems |