| Patents for G08B 13 - Burglar, theft, or intruder alarms (42,025) |
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| 03/05/1991 | US4998093 Portable personal electronic perimeter alarm |
| 02/28/1991 | DE4024723A1 Electronic article monitoring label |
| 02/27/1991 | EP0414628A2 Individually fed multiloop antennas for electronic security systems |
| 02/27/1991 | EP0413803A1 Electronic monitoring arrangement |
| 02/27/1991 | EP0413748A1 Imaging assembly and mounting for surveillance viewing under remote control |
| 02/27/1991 | EP0330656B1 Method of remote sensing of objects and apparatus therefor |
| 02/27/1991 | CN2072253U Anti-theft trigger |
| 02/26/1991 | US4996514 Car theft proofing system |
| 02/26/1991 | CA2021990A1 Individually fed multiloop antennas for electronic security systems |
| 02/21/1991 | WO1991002337A1 Antitheft contact sensor |
| 02/21/1991 | WO1991002287A1 Surveillance camera system |
| 02/20/1991 | CN2071814U Moving ultrasonic detector |
| 02/19/1991 | US4994939 Universal lattice for magnetic-electronic article surveillance system |
| 02/19/1991 | US4994916 Apparatus and method for encoding identification information for multiple asynchronous video signal sources |
| 02/19/1991 | US4994793 Weight shift detector |
| 02/19/1991 | US4994789 Phase shift divided leaky cable sensor |
| 02/19/1991 | CA1280488C Perimeter intrusion detection system with block ranging capability |
| 02/19/1991 | CA1280487C Intrusion detection system |
| 02/14/1991 | DE3923395C1 Double glazed window unit sensing break-in - has sensor unit between panes enclosing gas to deliver alarm signal at certain level of gas vapour |
| 02/13/1991 | EP0412721A2 Multi-directionally responsive, dual-status, magnetic article surveillance marker having a persistent state |
| 02/13/1991 | EP0412137A1 Magnetic materials for security applications. |
| 02/13/1991 | CN2071396U Resistance changing anti-sheft alarm for electric wire |
| 02/13/1991 | CN2071360U Anti-theft alarm device |
| 02/12/1991 | US4993049 Electronic management system employing radar type infrared emitter and sensor combined with counter |
| 02/12/1991 | US4992866 Camera selection and positioning system and method |
| 02/12/1991 | US4992789 Theft prevention |
| 02/12/1991 | US4992776 Antipilferage tags and their use |
| 02/12/1991 | CA1280188C Article security system |
| 02/07/1991 | WO1991001539A1 Integrated slow scan and alarm system |
| 02/06/1991 | EP0233269B1 Surveillance installation |
| 02/06/1991 | CN2070934U Electronic anti-theft alarm |
| 02/06/1991 | CN2070933U Heavy hammer anti-theft alarm |
| 02/05/1991 | US4991205 Personal identification system and method |
| 02/05/1991 | US4991146 Intrusion detection system |
| 02/05/1991 | US4991145 Infra-sonic detector and alarm with self adjusting reference |
| 02/05/1991 | US4990898 Surface-mount intrusion detection switch housing |
| 02/05/1991 | US4990897 Method and apparatus for detecting and recognizing impacts by measuring impedance variation |
| 02/05/1991 | US4990891 Identification device in the form of a tag-like strip affixable to an article |
| 02/05/1991 | US4990783 Range insensitive infrared intrusion detector |
| 02/05/1991 | US4990769 Continuous cable fiber optical pressure sensor |
| 01/31/1991 | DE3924622A1 Antitheft alarm protecting car, building, etc. - generates spoken warning via loudspeaker before bell or siren is sounded |
| 01/30/1991 | EP0410245A2 Multi-Mode Electronic article Surveillance System |
| 01/30/1991 | EP0410193A1 Operation prohibition code for a car radio |
| 01/30/1991 | EP0409880A1 Actuator and communication system. |
| 01/30/1991 | CN2070478U Inducting type theft-proof alarm device |
| 01/30/1991 | CN2070477U Miniature domestic theft-proof alarm device |
| 01/29/1991 | US4989085 Apparatus for remote verification and control of close circuit television cameras |
| 01/29/1991 | US4987754 Magnetically releasable target lock |
| 01/29/1991 | CA1279716C Passive transponder |
| 01/24/1991 | CA2014082A1 Detecting device for unlawful take-out of merchandise |
| 01/23/1991 | EP0409736A1 Monitoring and control system for a building |
| 01/23/1991 | EP0408980A2 Passive infrared movement detector with angular resolution |
| 01/23/1991 | EP0408573A1 Device for the identification of objects. |
| 01/22/1991 | US4987594 Stand-alone utility device with antitheft code with method for its use |
| 01/22/1991 | US4987406 Security system for electrical appliances and other items with electrical circuitry |
| 01/22/1991 | US4987402 Alarm system for sensing and vocally warning of an unauthorized approach towards a protected object or zone |
| 01/22/1991 | US4987394 Leaky cables |
| 01/22/1991 | CA1279386C Method of remote sensing of objects |
| 01/22/1991 | CA1279372C Non-electronic gain control |
| 01/17/1991 | DE3922864A1 Protection for display cabinets against unauthorised opening - contains identification card reader mounted on cabinet connected to data processing device |
| 01/17/1991 | DE3921586A1 Control and alarm system for bank safe deposit boxes - uses matrix of interconnected reed switches to detect interference and relay to control room |
| 01/16/1991 | EP0407861A2 Anti-theft method and device for cinematographic, photographic and video camera |
| 01/16/1991 | EP0407562A1 Electronic article surveillance device with remote deactivation |
| 01/16/1991 | EP0407506A1 Method and apparatus for integrated data capture and electronic article surveillance. |
| 01/16/1991 | CN2069584U Multifunctional theft-proof alarm |
| 01/15/1991 | US4985695 Computer security device |
| 01/15/1991 | US4985694 Car theft proofing system |
| 01/15/1991 | US4985693 Car theft proofing system |
| 01/15/1991 | US4985288 Resonant frequency characteristic tag and method of manufacturing the same |
| 01/10/1991 | WO1991000579A1 Transducers and alarm systems incorporating them |
| 01/10/1991 | DE3920957A1 Piezoelectric foil as appts. coating - surrounds appts. completely and responds to touching contact |
| 01/10/1991 | DE3920111A1 Laser monitoring device for machine safety zone - uses successive reflection of laser beam to provide grid enclosing safety zone |
| 01/09/1991 | CN2069140U Induction model electronic door bell |
| 01/09/1991 | CN2069139U Electronic alarm against burglary, rob and lance cutting |
| 01/08/1991 | US4984089 Outdoor surveillance dome with enhanced environmental aptitude and control system therefor |
| 01/08/1991 | US4984073 Methods and systems for scanning and inspecting images |
| 01/08/1991 | US4983948 Car theft proofing system |
| 01/08/1991 | US4983838 Pyroelectric element |
| 01/02/1991 | EP0405764A1 Conversion of bias strip in a frequency-dividing transponder tag into a tripole bar magnet to deactivate the tag |
| 01/01/1991 | US4982281 Surveillance system having a miniature television camera mounted behind an eyeball of a mannequin |
| 01/01/1991 | US4982176 Solar powered lighting and alarm systems activated by motion detection |
| 01/01/1991 | US4982094 Passive type crime-preventing infrared sensor provided with a mechanism of monitoring an obstruction for the visual field |
| 01/01/1991 | US4982092 360 Degree optical surveillance system |
| 12/31/1990 | CA2018267A1 Conversion of bias strip in a frequency-dividing-transponder tag into a tripole bar magnet to deactivate the tag |
| 12/30/1990 | CA2020033A1 Camera selection and positioning system and method |
| 12/27/1990 | WO1990015998A1 Object detection and analysis with transmission lines |
| 12/27/1990 | EP0403632A1 Electronic article surveillance system with improved differentiation |
| 12/27/1990 | EP0403588A1 Method of intrusion detection |
| 12/27/1990 | CA1278372C System for processing video signal for detecting changes in video data and security monitoring system utilizing the same |
| 12/27/1990 | CA1278352C Receiving device |
| 12/27/1990 | CA1278225C Pressure-responsive security alarm |
| 12/26/1990 | CN2068259U Miniature warning unit for distance |
| 12/26/1990 | CN2068258U Anti-stealing alarm with vibration sensor |
| 12/25/1990 | US4980672 Overhead socket smoke detector with theft alarm |
| 12/25/1990 | US4980670 Deactivatable E.A.S. marker having a step change in magnetic flux |
| 12/25/1990 | US4980666 For an automotive vehicle |
| 12/25/1990 | US4980555 Spinning photosensitive polyamide on a metal layer of substrate, baking, exposing, developing, masking and demasking |
| 12/19/1990 | EP0403143A2 Vertical motion detector |
| 12/19/1990 | EP0402829A2 Method and device for detecting an intruder using a passive infra-red motion detector |
| 12/19/1990 | CN2067849U 开关报警器 Alarm switch |