USRE33824E - Fault detecting intrusion detection device - Google Patents
Fault detecting intrusion detection device Download PDFInfo
- Publication number
- USRE33824E USRE33824E US07/429,054 US42905489A USRE33824E US RE33824 E USRE33824 E US RE33824E US 42905489 A US42905489 A US 42905489A US RE33824 E USRE33824 E US RE33824E
- Authority
- US
- United States
- Prior art keywords
- output signals
- subsystem
- storing
- counting
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 51
- 230000006872 improvement Effects 0.000 claims abstract description 5
- 230000009977 dual effect Effects 0.000 claims description 14
- 230000004044 response Effects 0.000 claims description 6
- 230000007257 malfunction Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/183—Single detectors using dual technologies
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/24—Electrical actuation by interference with electromagnetic field distribution
- G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
- G08B13/2494—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field by interference with electro-magnetic field distribution combined with other electrical sensor means, e.g. microwave detectors combined with other sensor means
Definitions
- the present invention relates to an improved intrusion detection device and, more particularly, to an improved intrusion detection device of the type having two sensors and the ability to detect fault within one of the two sensors.
- Combination intrusion detection devices are wellknown in the art.
- a typical combination is the use of a passive infrared intrusion detection device along with a microwave intrusion detection device.
- the output of the two sensors are supplied to an AND gate. If both of the sensors detect the presence of an intruder, then an alarm is triggered.
- One drawback of a combination dual sensing device is that if one of the sensors or subsystems fails to operate properly, the integrity of the entire system is lost. This is because once a subsystem or the sensor thereof has failed (assuming that it fails in the open mode; i.e., the failed sensor/subsystem never detects the presence of an intruder), and since the entire system is dependent upon the presence of a signal on both of the sensor subsystems, the failure of one sensor subsystem fails the entire system.
- a second possible source of sensor failure is if the sensor is not installed properly. In order for the entire intrusion detection system to function properly, both sensor subsystems must be directed at the same volume or space location. Both sensors must detect the presence of an intruder in the same or proximate location. Thus, there must be overlapping of the area or space of detection of the two sensors. If the two sensor subsystems are not aligned properly and are not directed towards the same space or volume location, the non-overlapping field will result in the entire system never producing alarm. This is because an intruder will always be detected by only a single sensor subsystem. Another source of failure is due to tampering. If a would-be intruder has masked or disabled one sensor subsystem, there again the disablement of that sensor subsystem would have disabled the entire system.
- an intrusion detection system of the dual sensor subsystem type it is highly desirable in an intrusion detection system of the dual sensor subsystem type to be able to detect any internal electrical malfunction of any one of the sensor subsystems, or to detect any physical tampering of any one of the sensor subsystems, or to detect any masking of the normal fields of use of any of the sensor subsystems or to detect the improper installation which results in substantially different fields of view of each sensor subsystem. Any of these conditions may be termed collectively as a "fault condition".
- an improvement to an intrusion detection apparatus is disclosed.
- the intrusion detection apparatus is of the type having dual sensors with each of the two sensors providing a signal upon the detection of an intruder.
- Logic means is further provided to process the two signals from the dual sensors to trigger an alarm in the event the intruder is detected by both of the sensors.
- the improvement comprises a first storage means for storing the number of signals recorded by one of the dual sensors.
- a second storage means stores the number of signals detected by the second sensor.
- a logic control means receives the output of the first and second storage means and compares the numbers stored therein and outputs a fault signal in response to this comparison.
- FIG. 1 is a schematic block diagram of an improved intrusion detection system of the present invention.
- FIG. 2 is a schematic block diagram of the fault detection subsystem of the intrusion detection device of the present invention.
- FIG. 3 is a detail circuit diagram of the fault detection subsystem of the present invention.
- the intrusion detection system 10 of the present invention comprises a first sensor 12 subassembly and a second sensor 14 subassembly.
- the first sensor 12 subassembly is typically a passive infrared radiation detection subsystem.
- the second sensor 14 subassembly is typically a microwave energy detection subsystem.
- Each of the first sensor 12 subsystem and second sensor 14 subsystem is directed to detect intruders within the same space or volume of space 16.
- Each of the first sensor 12 subsystem and second sensor 14 subsystem produces a first output signal 18 and a second output signal 20, respectively, upon the detection of an intruder within the space or volume 16 to which the subsystem is directed.
- Such a system 10, using the combination of a photoelectric sensor and microwave detector is fully described in U.S. Pat. No. 3,725,888.
- the first and second output signals 18 and 20, respectively, are supplied to a logic controller 22.
- the logic controller 22 produces an output signal 24 which triggers an alarm 26 in the event an intruder is detected by both the first sensor 12 subsystem and the second sensor 14 subsystem, within a specified period of time.
- the device 10 also comprises a fault detection subsystem 30.
- the fault detection subsystem 30 also receives the first and second output signals 18 and 20, respectively.
- the fault detection subsystem 30 comprises an input signal conditioner 32 to which the first and second output signals 18 and 20, respectively, are supplied.
- the input signal conditioner 32 processes the input signals, by for example, holding them for a predetermined period of time.
- the first and second output signals 18 and 20 are supplied to a rapid event suppressor 34.
- the rapid event suppressor 34 detects the presence of a rapid series of pulses. If this occurs, the fault detection subsystem 30 will stop counting the output signal 18 or 20 for a preset period of time.
- the first and second output signals 18 and 20, respectively are supplied to a first and a second counters 36 and 38, respectively.
- the output of the first and the second event counter 36 and 38 are supplied to a control logic 40.
- the control logic 40 also receives a user selectable ratio number along input lines 42 which pass through a ratio select logic 44.
- the output of the control logic 40 is a signal which can indicate fault in one of the two sensor subsystems. That fault signal 46 is supplied to a NOR gate 48. Other inputs to the NOR Gate 48 are a tamper signal 50 and a microwave supervisory signal 52. Further, the NOR gate 48 may be disabled by a signal sent along the disabled line 54.
- the output of the NOR gate 48 is a signal which is supplied to a relay drive 56 and to an LED drive 58 which informs the user of the fault that is detected.
- An oscillator and clock generator 60 supplies the necessary clocking signals to the rapid events suppressor 34 and to the LED drive 58.
- the first sensor output signal 18 is supplied to a NAND gate 62, and to an OR gate 64 and an invertor 66.
- the output of the NAND gate 62 is supplied to a second AND gate 68, which is then supplied to the first counter 36, which is an eight (8) bit counter.
- NAND gate 62 is also controlled by the rapid event suppressor 34. In the event a rapid series of pulses is detected by the suppressor 34, NAND gate 62 is turned off thereby preventing first sensor output signal 18 from reaching the first counter 36. Gates 64 and 68 are used for testing purposes.
- the second output signal 20 from the microwave detection subsystem 14 is supplied to a one-shot 68 (which comprises a counter 68a and an OR gate 68b), which keeps the signal low for approximately 3.8 seconds after the last microwave pulse.
- the output of the one-shot 68 is then passed to a NOR gate 70, to an AND gate 72 and to the second counter 38, which is also an eight bit counter.
- the function of the NOR gate 70 is similar to the NAND gate 62. AND gates 72 and 73 are also used for testing purposes.
- the rapid event suppressor 34 comprises, in part, a long counter 100 and a dual counter 101.
- the long counter 100 receives timing pulses from the oscillator and clock generator 60.
- the dual counter 101 receives the first and second output signals 18 and 20 (after passing through gates 62 and 70, respectively).
- the long counter 100 resets the dual counter 101 every one (1) minute.
- the dual counter 101 receives greater than or equal to eight (8) signals (first or second output signals 18 or 20) within a one minute interval, the dual counter 101 (1) causes the dual counter 101 to be reset; (2) turns off gates 62 and 70 for eight (8) minutes; and (3) after eight (8) minutes, turns on gates 62 and 70 and resumes normal operation.
- the four user selectable ratio signals 42 are supplied to the ratio select logic 44 which comprises a plurality of AND gates, an OR gate and multiplexers 86 and 90, all as shown and connected in FIG. 3. Two of the four user selectable ratio signals 42 are used to disable the appropriate least significant bits (LSB) from the first and second counters 36 and 38 to obtain the conditions of (1) greater than 0; (2) greater than 1; (3) greater than 3; or (4) greater than 7 as inputs to PIR AND gate 80 and MW AND gate 82.
- the output of the PIR AND gate 80 and MW AND gate 82 is a determination of the number of signals (18 or 20, respectively) counted by counters 36 and 38 which meets or exceeds the number set by two of the four user selectable input lines 42.
- the other two user selectable lines 42 are supplied to multiplexers 86 and 90.
- the multiplexers 86 and 90 select one of the four MSB from counters 36 and 38 and supplies that as input to PIR AND gate 85 and MW AND gate 89, and also to gates 88 and 84, respectively.
- PIR AND gate 85 and MW AND gate 89 and also to gates 88 and 84, respectively.
- the counter 36 or 38 reaches a number of the MSB that is selected by the two user selectable lines 42, that causes a compare event at 92 and 94. In that event, the least significant bits of the counter 36 or 38 that did not cause the compare event is analyzed to determine if that number meets or exceeds the number set by the other two user selectable lines.
- a pulse appears at 94. This indicates "no fault”.
- the no fault pulse 94 resets the first and second counters 36 and 38. However, if the converse occurred, a pulse would appear at 92. This indicates a "fault", i.e., too many signals of the sensor of one type are counted as compared to the signals of the sensor of the other type.
- the fault pulse 92 is supplied to the NOR gate 48, which then triggers a flip flop 46.
- the Q output of the flip flop 96 triggers the relay drive 56 and the LED drive 58.
- the user first selects the number of events to cause the compare and the minimum for the compare.
- the first and second sensors 12 and 14 would be counting the intruders in the space 16. These counts would be collected by the fault detection subsystem 30 and stored in the first and second counters 36 and 38, respectively.
- the first or second counter 36 or 38 reaches the number set by the user for a compare event, the number of counts stored in the counter that did not cause the compare event is compared to the minimum set by the user. If that number is greater than the minimum, then "no fault". Otherwise there is a fault in one of the sensor subsystems.
- the operation of the fault detection subsystem 30 in no way impedes the arming or disarming of the intrusion detection device 10. During the time that the fault detection subsystem 30 is in operation, the intrusion detection device 10 can still be armed.
- the intrusion detection system 10 of the present invention There are many advantages to the improved intrusion detection system 10 of the present invention. First and foremost, with the use of a dual sensor intrusion detection system, false alarm is minimized. Furthermore, with the fault detection 30, it is seen that the failure of one of the sensor subsystems can be easily detected, and an indication be sent to the user of the failure of the intrusion detection device 1?. Thus, the intrusion detection device 10 has all of the advantages of both fail-safe, as well as reliability.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Burglar Alarm Systems (AREA)
Abstract
Description
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/429,054 USRE33824E (en) | 1986-08-05 | 1989-10-30 | Fault detecting intrusion detection device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/893,399 US4710750A (en) | 1986-08-05 | 1986-08-05 | Fault detecting intrusion detection device |
US07/429,054 USRE33824E (en) | 1986-08-05 | 1989-10-30 | Fault detecting intrusion detection device |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/893,399 Reissue US4710750A (en) | 1986-08-05 | 1986-08-05 | Fault detecting intrusion detection device |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE33824E true USRE33824E (en) | 1992-02-18 |
Family
ID=25401505
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/893,399 Ceased US4710750A (en) | 1986-08-05 | 1986-08-05 | Fault detecting intrusion detection device |
US07/429,054 Expired - Lifetime USRE33824E (en) | 1986-08-05 | 1989-10-30 | Fault detecting intrusion detection device |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/893,399 Ceased US4710750A (en) | 1986-08-05 | 1986-08-05 | Fault detecting intrusion detection device |
Country Status (7)
Country | Link |
---|---|
US (2) | US4710750A (en) |
EP (1) | EP0259015B1 (en) |
JP (1) | JPH0782589B2 (en) |
AU (1) | AU588207B2 (en) |
CA (1) | CA1264832A (en) |
DE (1) | DE3775305D1 (en) |
ES (1) | ES2028089T3 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5473311A (en) * | 1994-09-16 | 1995-12-05 | C&K Systems, Inc. | Method and apparatus to distinguish human intruder and animal intruder |
US5578988A (en) * | 1994-09-16 | 1996-11-26 | C & K Systems, Inc. | Intrusion detection system having self-adjusting threshold |
US6384414B1 (en) * | 1997-11-25 | 2002-05-07 | Board Of Regents, The University Of Texas System | Method and apparatus for detecting the presence of an object |
US20040075548A1 (en) * | 2002-10-21 | 2004-04-22 | Beggs Ryan P. | Monitoring a remote body detection system of a door |
US20050044792A1 (en) * | 2003-06-20 | 2005-03-03 | Beggs Ryan P. | Door with a safety antenna |
US7120238B1 (en) | 2001-07-12 | 2006-10-10 | 8X8, Inc. | Sensor-controlled telephone system |
US20070063841A1 (en) * | 2005-09-22 | 2007-03-22 | Honeywell International, Inc. | Cross-zone supervision for a security system |
US20100019903A1 (en) * | 2007-02-15 | 2010-01-28 | Atsumi Electric Co., Ltd. | Passive infrared detector |
Families Citing this family (40)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5535331A (en) * | 1987-09-04 | 1996-07-09 | Texas Instruments Incorporated | Processor condition sensing circuits, systems and methods |
GB2217889B (en) * | 1988-04-08 | 1992-09-23 | Matsushita Electric Works Ltd | Composite type crime preventive sensor |
US4833450A (en) * | 1988-04-15 | 1989-05-23 | Napco Security Systems, Inc. | Fault detection in combination intrusion detection systems |
US4882567A (en) * | 1988-09-29 | 1989-11-21 | C & K Systems, Inc. | Intrusion detection system and a method therefor |
US5019802A (en) * | 1989-12-15 | 1991-05-28 | Brittain Raymond C | Intrusion detection apparatus |
US5077548A (en) * | 1990-06-29 | 1991-12-31 | Detection Systems, Inc. | Dual technology intruder detection system with sensitivity adjustment after "default" |
US5216410A (en) * | 1990-11-16 | 1993-06-01 | Digital Security Controls Ltd. | Intrusion alarm sensing unit |
US5164703A (en) * | 1991-05-02 | 1992-11-17 | C & K Systems, Inc. | Audio intrusion detection system |
AU657545B2 (en) * | 1991-06-21 | 1995-03-16 | Boral Energy Asset Management Limited | Dual gas monitor |
US5276427A (en) * | 1991-07-08 | 1994-01-04 | Digital Security Controls Ltd. | Auto-adjust motion detection system |
GB2263360B (en) * | 1992-01-06 | 1996-02-07 | C & K Systems Inc | Improvements in or relating to antennas |
US5583523A (en) * | 1992-01-06 | 1996-12-10 | C & K Systems, Incorporation | Planar microwave tranceiver employing shared-ground-plane antenna |
US5332536A (en) * | 1992-01-22 | 1994-07-26 | Cook Composites And Polymers Co. | Molding resins and UV-transparent molds made from the resins for making fiber reinforced articles |
US5331308A (en) * | 1992-07-30 | 1994-07-19 | Napco Security Systems, Inc. | Automatically adjustable and self-testing dual technology intrusion detection system for minimizing false alarms |
CA2113026A1 (en) * | 1993-01-28 | 1994-07-29 | Paul Michael Hoseit | Methods and apparatus for intrusion detection having improved immunity to false alarms |
US5416487A (en) * | 1993-06-28 | 1995-05-16 | Scantronic Limited | Testing of dual technology sensors |
US5491467A (en) * | 1994-01-31 | 1996-02-13 | C & K Systems, Inc. | Location independent intrusion detection system |
GB2288681B (en) * | 1994-04-14 | 1998-05-20 | Pyronix Ltd | Fault monitoring event detection device |
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US5581237A (en) * | 1994-10-26 | 1996-12-03 | Detection Systems, Inc. | Microwave intrusion detector with threshold adjustment in response to periodic signals |
US5640142A (en) * | 1995-02-01 | 1997-06-17 | Pittway Corporation | Alarm system testing circuit |
GB2308482B (en) * | 1995-12-20 | 2000-03-29 | Pyronix Ltd | Event detection device with fault monitoring capability |
US5684458A (en) * | 1996-02-26 | 1997-11-04 | Napco Security Systems, Inc. | Microwave sensor with adjustable sampling frequency based on environmental conditions |
US5986357A (en) * | 1997-02-04 | 1999-11-16 | Mytech Corporation | Occupancy sensor and method of operating same |
US6078253A (en) * | 1997-02-04 | 2000-06-20 | Mytech Corporation | Occupancy sensor and method of operating same |
US6087938A (en) * | 1997-09-17 | 2000-07-11 | Nachshol Electronics Ltd. | Outdoor intrusion detector |
WO2000068906A1 (en) | 1999-05-07 | 2000-11-16 | C & K Systems, Inc. | Glass-break detector and method of alarm discrimination |
ITMI20011043A1 (en) * | 2001-05-18 | 2002-11-18 | Beghelli Spa | ANTI-INTRUSION DEVICE |
US20030128130A1 (en) * | 2001-11-30 | 2003-07-10 | Everspring Industry Co., Ltd. | Solar powered radio transmission security camera |
JP4250697B2 (en) * | 2003-09-04 | 2009-04-08 | オプテックス株式会社 | Combination sensor |
US7034675B2 (en) * | 2004-04-16 | 2006-04-25 | Robert Bosch Gmbh | Intrusion detection system including over-under passive infrared optics and a microwave transceiver |
JP2008511068A (en) * | 2004-08-27 | 2008-04-10 | シンガポール テクノロジーズ ダイナミックス ピーティーイー リミテッド | Multi-sensor intrusion detection system |
JP3793822B1 (en) * | 2005-01-07 | 2006-07-05 | オプテックス株式会社 | Microwave sensor |
US7680283B2 (en) * | 2005-02-07 | 2010-03-16 | Honeywell International Inc. | Method and system for detecting a predetermined sound event such as the sound of breaking glass |
CN100426330C (en) * | 2006-12-29 | 2008-10-15 | 黄尚南 | Infrared microwave alarm |
US9613510B2 (en) * | 2013-02-05 | 2017-04-04 | Honeywell International Inc. | Apparatus and method for rapid human detection with pet immunity |
TWI659397B (en) * | 2014-03-03 | 2019-05-11 | 比利時商Vsk電子股份有限公司 | Intrusion detection with motion sensing |
US10306341B2 (en) * | 2017-06-28 | 2019-05-28 | Motorola Solutions, Inc. | Method and apparatus for determining sensor data reliability at an incident scene for real-time and post-incident processing |
US10657784B1 (en) * | 2018-05-14 | 2020-05-19 | Amazon Technologies, Inc. | Auxiliary motion detector for video capture |
CN109147248A (en) * | 2018-09-14 | 2019-01-04 | 深圳世元云标识科技有限公司 | A kind of mark forbids swarming into intellectual monitoring alarm system and method |
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- 1986-08-05 US US06/893,399 patent/US4710750A/en not_active Ceased
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- 1987-07-21 CA CA000542567A patent/CA1264832A/en not_active Expired
- 1987-07-30 AU AU76296/87A patent/AU588207B2/en not_active Expired
- 1987-07-31 JP JP62190546A patent/JPH0782589B2/en not_active Expired - Lifetime
- 1987-08-05 EP EP87306935A patent/EP0259015B1/en not_active Expired - Lifetime
- 1987-08-05 DE DE8787306935T patent/DE3775305D1/en not_active Expired - Lifetime
- 1987-08-05 ES ES198787306935T patent/ES2028089T3/en not_active Expired - Lifetime
-
1989
- 1989-10-30 US US07/429,054 patent/USRE33824E/en not_active Expired - Lifetime
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Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5578988A (en) * | 1994-09-16 | 1996-11-26 | C & K Systems, Inc. | Intrusion detection system having self-adjusting threshold |
US5473311A (en) * | 1994-09-16 | 1995-12-05 | C&K Systems, Inc. | Method and apparatus to distinguish human intruder and animal intruder |
US6384414B1 (en) * | 1997-11-25 | 2002-05-07 | Board Of Regents, The University Of Texas System | Method and apparatus for detecting the presence of an object |
US7120238B1 (en) | 2001-07-12 | 2006-10-10 | 8X8, Inc. | Sensor-controlled telephone system |
US20040075548A1 (en) * | 2002-10-21 | 2004-04-22 | Beggs Ryan P. | Monitoring a remote body detection system of a door |
US7034682B2 (en) | 2003-06-20 | 2006-04-25 | Rite-Hite Holding Corporation | Door with a safety antenna |
US20050044792A1 (en) * | 2003-06-20 | 2005-03-03 | Beggs Ryan P. | Door with a safety antenna |
US7151450B2 (en) | 2003-06-20 | 2006-12-19 | Rite-Hite Holding Corporation | Door with a safety antenna |
US20070063841A1 (en) * | 2005-09-22 | 2007-03-22 | Honeywell International, Inc. | Cross-zone supervision for a security system |
WO2007038224A2 (en) * | 2005-09-22 | 2007-04-05 | Honeywell International, Inc. | Cross-zone supervision for a security system |
WO2007038224A3 (en) * | 2005-09-22 | 2007-07-12 | Honeywell Int Inc | Cross-zone supervision for a security system |
US7423530B2 (en) * | 2005-09-22 | 2008-09-09 | Honeywell International Inc. | Cross-zone supervision for a security system |
US20100019903A1 (en) * | 2007-02-15 | 2010-01-28 | Atsumi Electric Co., Ltd. | Passive infrared detector |
Also Published As
Publication number | Publication date |
---|---|
US4710750A (en) | 1987-12-01 |
EP0259015A3 (en) | 1988-07-06 |
ES2028089T3 (en) | 1992-07-01 |
DE3775305D1 (en) | 1992-01-30 |
EP0259015B1 (en) | 1991-12-18 |
AU588207B2 (en) | 1989-09-07 |
EP0259015A2 (en) | 1988-03-09 |
AU7629687A (en) | 1988-02-11 |
JPS6345697A (en) | 1988-02-26 |
CA1264832A (en) | 1990-01-23 |
JPH0782589B2 (en) | 1995-09-06 |
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