CA2005068A1 - Anti-tamper device - Google Patents
Anti-tamper deviceInfo
- Publication number
- CA2005068A1 CA2005068A1 CA 2005068 CA2005068A CA2005068A1 CA 2005068 A1 CA2005068 A1 CA 2005068A1 CA 2005068 CA2005068 CA 2005068 CA 2005068 A CA2005068 A CA 2005068A CA 2005068 A1 CA2005068 A1 CA 2005068A1
- Authority
- CA
- Canada
- Prior art keywords
- tamper device
- timer means
- sensor beam
- article
- timer
- 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.)
- Abandoned
Links
Classifications
-
- 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
- G08B13/2402—Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
- G08B13/2465—Aspects related to the EAS system, e.g. system components other than tags
- G08B13/2468—Antenna in system and the related signal processing
- G08B13/2474—Antenna or antenna activator geometry, arrangement or layout
-
- 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
- G08B29/02—Monitoring continuously signalling or alarm systems
- G08B29/04—Monitoring of the detection circuits
- G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
Abstract
ABSTRACT
An anti-tamper device for use with a security detection apparatus and provided with timer means and detector means. Upon the detection of a person or article by the detector means, said means initiates the timer means. The timer means arranged such that this means initiates the operation of an alarm device if an expected subsequent movement of the person or article does not occur after initiation of the timer means and within a time period set in the timer means.
An anti-tamper device for use with a security detection apparatus and provided with timer means and detector means. Upon the detection of a person or article by the detector means, said means initiates the timer means. The timer means arranged such that this means initiates the operation of an alarm device if an expected subsequent movement of the person or article does not occur after initiation of the timer means and within a time period set in the timer means.
Description
: ~
AN ANTI-I`AMPER DEYICE
.':
This invention relates to an anti-tamper device and, more especially, this inventio~ relates to anti~tamper device for use with security detection ;.
apparatus. m e security detection apparatus may be electromagnetic detection apparatus for use in anti-theft .
security applications.
Electromagnetic detection systems for use in nti-~heft sec~ity applications are well known. The electromagnetic detection systems operate by generating ``
~0 a low freauency strong ~gnetiç ~ et~!een ~.~ro ent~nn~e. . `~. ;
The systems are activated by appropriate targets which ;.~
may be, for example, a metal strip. The metal strip may : `
be an amorphous metal strip. m e systems are frequently used for the protection of a wide variety of articles `~
in department stores, l~braries, do-it-yourself shops, drug :.
stores, computer rooms and data libraries. . --`
m e known electromagnetic detection systems .`~`-are not alwàys sufficiently efficient in detecting the .:
target, for example the metal strip target. More specifically, the systems can be easily defeated by passing ;~
the target very quickly, thereby not giving the system --time to analise the target and generate an alarm if appropriate ~us a thief who runs through the s~stem may not be dete~te~
.
- ' ~
AN ANTI-I`AMPER DEYICE
.':
This invention relates to an anti-tamper device and, more especially, this inventio~ relates to anti~tamper device for use with security detection ;.
apparatus. m e security detection apparatus may be electromagnetic detection apparatus for use in anti-theft .
security applications.
Electromagnetic detection systems for use in nti-~heft sec~ity applications are well known. The electromagnetic detection systems operate by generating ``
~0 a low freauency strong ~gnetiç ~ et~!een ~.~ro ent~nn~e. . `~. ;
The systems are activated by appropriate targets which ;.~
may be, for example, a metal strip. The metal strip may : `
be an amorphous metal strip. m e systems are frequently used for the protection of a wide variety of articles `~
in department stores, l~braries, do-it-yourself shops, drug :.
stores, computer rooms and data libraries. . --`
m e known electromagnetic detection systems .`~`-are not alwàys sufficiently efficient in detecting the .:
target, for example the metal strip target. More specifically, the systems can be easily defeated by passing ;~
the target very quickly, thereby not giving the system --time to analise the target and generate an alarm if appropriate ~us a thief who runs through the s~stem may not be dete~te~
.
- ' ~
It ~s also ~ometimes possible for a pers~n to walk through a known electromagnetic detection ~ystem sufficiently lowly with a ~arget carefully held without raising an alarm. Furthermore, articles tj . provided with the targets can sometimes be slid along the floor in order to bypass the electr~magnetic detection field.
In the majority of applications of the known electromagnetic detection systems, the above ~;~
mentione* methods of attempting to defeat the systems usually require the potential thief to act in a strange manner which is observed. There are however some situations such as in security conscious buildings, for exa~ple computer rooms or data libraries, where the potential thief may not be under constant observation and where it is important not to defeat the system.
It is an aim of the present invention to obviate or reduce the above mentioned problem.
! ' i ' ~Accordingly~ this invention provides an anti-tamper deYice for use with security detection apparatus~ which anti-tamper device comprises timer means and detector means for initiating operation of the timer means consequent upon the detecti~n of a person or article.
and the timer means being such as to initiate t21e ; ~
~-.
In the majority of applications of the known electromagnetic detection systems, the above ~;~
mentione* methods of attempting to defeat the systems usually require the potential thief to act in a strange manner which is observed. There are however some situations such as in security conscious buildings, for exa~ple computer rooms or data libraries, where the potential thief may not be under constant observation and where it is important not to defeat the system.
It is an aim of the present invention to obviate or reduce the above mentioned problem.
! ' i ' ~Accordingly~ this invention provides an anti-tamper deYice for use with security detection apparatus~ which anti-tamper device comprises timer means and detector means for initiating operation of the timer means consequent upon the detecti~n of a person or article.
and the timer means being such as to initiate t21e ; ~
~-.
operation of an alarm lf an expected subsequent movement of the ~erson or article does not ~ccur after initiation of the timer means and within a time period set in the timer means.
Preferably, the znti-tamper de~ice includes at least one first reflector and retroreflective scan .: . . ..
. .
sensor arrangement for detecting the person or article, `~ ~`
and includes at least one second reflector and retroreflecti~e scan sensor arrangement for detecting ~`~
the expected subsequent movement. ~``
m e anti-tamper device may be one in which the timer means is such as to initia-te operation of ~ ; -the alarm if the person or Prticle interrupts a first .. -: . . . ~ , sensor beam from the first reflector and retroreflecti~?e 1~ scan arrangement and does not interrupt in the time period a second sensor beam from the second reflector and retroreflecti~e scan arrangement, or if the person -~
or article only separately interrupts the first or the . - : ~
second sensor beam. The first sensor beam may be a ; 20 front sensor beam and the second sensor beam may!be a rear sensor beam. The first and the second sensor beam~
may be positioned other ihan in the front and the rear respectively as may be desired.
'' ~.'. . ''; -'' ' .~ ' . ",., : ::
Preferably, the znti-tamper de~ice includes at least one first reflector and retroreflective scan .: . . ..
. .
sensor arrangement for detecting the person or article, `~ ~`
and includes at least one second reflector and retroreflecti~e scan sensor arrangement for detecting ~`~
the expected subsequent movement. ~``
m e anti-tamper device may be one in which the timer means is such as to initia-te operation of ~ ; -the alarm if the person or Prticle interrupts a first .. -: . . . ~ , sensor beam from the first reflector and retroreflecti~?e 1~ scan arrangement and does not interrupt in the time period a second sensor beam from the second reflector and retroreflecti~e scan arrangement, or if the person -~
or article only separately interrupts the first or the . - : ~
second sensor beam. The first sensor beam may be a ; 20 front sensor beam and the second sensor beam may!be a rear sensor beam. The first and the second sensor beam~
may be positioned other ihan in the front and the rear respectively as may be desired.
'' ~.'. . ''; -'' ' .~ ' . ",., : ::
m e t~mer means may be an integrated circuit with alarm outputs. Other t~pes of timer means may however be employed. ~-The timer means may comprise time period adjuster means whereby $he timer means can be provided with different time peri~ds.
m e time per~od adjuster means is preferably at least one variable potentiometer.
The timer ~eans ~ay be provided ~ith a housing having a display~ Preferably the display is a light emitting diode display. Other types of display may be employed. m e display preferably gives the status condition o:F the anti-tamper device.
The anti-~amper device may be one in which the housing has a lid, and in which the housing is prQvided with relay means for generating an alarm consequent upon the unauthorised opening of the lid. The relay means is preferably a micro switch. Other types of relay means may be employed.
! ' 20 Preferably, the detector means is a form of -anti-shoplifting de~ice utilising antenna to produce the detection field~ The detection field may be either electromagnetic or radio ~requency.
Preferably, the anti-~amper device comprises more than one first sensor beam in the first reflect~r and retroreflecti~e scan arrangement, and more than one sensor :,, ,., - "... . . . ..... .... . . . .. .. ..
m e time per~od adjuster means is preferably at least one variable potentiometer.
The timer ~eans ~ay be provided ~ith a housing having a display~ Preferably the display is a light emitting diode display. Other types of display may be employed. m e display preferably gives the status condition o:F the anti-tamper device.
The anti-~amper device may be one in which the housing has a lid, and in which the housing is prQvided with relay means for generating an alarm consequent upon the unauthorised opening of the lid. The relay means is preferably a micro switch. Other types of relay means may be employed.
! ' 20 Preferably, the detector means is a form of -anti-shoplifting de~ice utilising antenna to produce the detection field~ The detection field may be either electromagnetic or radio ~requency.
Preferably, the anti-~amper device comprises more than one first sensor beam in the first reflect~r and retroreflecti~e scan arrangement, and more than one sensor :,, ,., - "... . . . ..... .... . . . .. .. ..
' ~ ' "~ ' ' ' beam in the second reflector ~Id retroreflective 5can arrangement~ Cenerall~, ~he more beams th~t are employed, , ,, ,~.
the greater will be the level of security af~orded by tlle ~-~
anti-tamper device. ~ ;
The present ~nvention also extends to security detection apparatus when provided wlth the anti-tamper de~ice. ~ ;~
The security detection apparatus ma~ be `~ `~
electromagnetic detection apparatus such for example as for use in anti-theft security applications. Other types of security detection apparatus may however be provide~
with the anti-tamper device. ;~
An embodiment o~ the invention will now be ~;
described solely by way of example and with reference to ~-~
the accompanying drawings in which~
Figure 1 shows electromagnetic security ~;
detection apparatus provided with reflectors an~
retroreflective scan sensors which form part of an anti~
tamper device; and Figure 2 is a block diagram showillg the anti-tamper device and its connection to the electromagneti~
~ecurity detection apparatus.
Re~erring to Fi~ure 1, there is shown -electromagnetic security detection apparatus 2 comprising ,. .., : i a ~rame 4. The detection apparatus 2 operates by gener~tillg . .
, i . .. . ,`, ` .'.' ~ ~ ~ ...
the greater will be the level of security af~orded by tlle ~-~
anti-tamper device. ~ ;
The present ~nvention also extends to security detection apparatus when provided wlth the anti-tamper de~ice. ~ ;~
The security detection apparatus ma~ be `~ `~
electromagnetic detection apparatus such for example as for use in anti-theft security applications. Other types of security detection apparatus may however be provide~
with the anti-tamper device. ;~
An embodiment o~ the invention will now be ~;
described solely by way of example and with reference to ~-~
the accompanying drawings in which~
Figure 1 shows electromagnetic security ~;
detection apparatus provided with reflectors an~
retroreflective scan sensors which form part of an anti~
tamper device; and Figure 2 is a block diagram showillg the anti-tamper device and its connection to the electromagneti~
~ecurity detection apparatus.
Re~erring to Fi~ure 1, there is shown -electromagnetic security detection apparatus 2 comprising ,. .., : i a ~rame 4. The detection apparatus 2 operates by gener~tillg . .
, i . .. . ,`, ` .'.' ~ ~ ~ ...
a low frequency strong magnetic ~ield between two ~ntennae formed by th~ ~ame 4. The detection ~p~ara~us 2 is such that persons wishing to remove articles from an ,establishment such for example as a computer ro~m or a data library are required to pass with ~he article through the frame 4. A metall~c target strip on the article is detected by the detection apparatus 2 in a known manner. More specifically, the de~ector apparatus 2 also comprises a control box 6 which is made of metal and which houses transmitter and receiver electronics.
m e transmitter generates a very low frequency strong magnetic field between the antennae, the antennae b~ing basically coils of wires. When the target strip enters the electromagnetic ~ield, it is saturated. The receiver section ~n the control box 6 monitors the characteristics of the target strip under satura~ion and generates an alarm if the characteristics coinoide.
The present invention provides an anti-tamper device 8 which comprises a control box 10. m e control I box 10 is made of a pl2stics material. The control box 10 is provided wi~h a lid wh~ch is fitted with relay mean in the form of a micro switch. The micro switch generates an alarm if ~he lid ic opened or removed.
As can be seen fro~ Figure 2, the control box 10 comprises timer means in ~he form of a timer circuit 12.
.. . . - . ., ... .. . . . ~ . . . . .
m e transmitter generates a very low frequency strong magnetic field between the antennae, the antennae b~ing basically coils of wires. When the target strip enters the electromagnetic ~ield, it is saturated. The receiver section ~n the control box 6 monitors the characteristics of the target strip under satura~ion and generates an alarm if the characteristics coinoide.
The present invention provides an anti-tamper device 8 which comprises a control box 10. m e control I box 10 is made of a pl2stics material. The control box 10 is provided wi~h a lid wh~ch is fitted with relay mean in the form of a micro switch. The micro switch generates an alarm if ~he lid ic opened or removed.
As can be seen fro~ Figure 2, the control box 10 comprises timer means in ~he form of a timer circuit 12.
.. . . - . ., ... .. . . . ~ . . . . .
me c~ntrol box 10 also compr~ses detector means ~n the form of a ~ignal input detector device 14. ~ ~
me signal input detector device 14 ls for initiating ~ ~;
operation of the timer means consequent upon the detecti~
of a person or article. The timer oircuit 12 is such as to initiate operation of an alarm via an alarm out device 16 if an expected subsequent movement of the person ~r `-`~
article does not occur after the initiation of the timer -~
circuit 12 and within a time period set in the timer .
circuit 12.
Figure 2 shows how the anti-tamper device ~-8 is provided with first, se~ond and third reflector and retroreflective scan sensor arrangements 18,20~22. Each ~ `
reflector and retroreflective scan sensor arrangement 1~ 18,20,22 comprises a reflector 24 and a retroreflective scan sensor 26 which includes transmitter/receiver apparatus. ~igure 1 illustrates the position of the reflectors 24 and the retroreflective scan sensors 2 The control box 10 may include a light . . . :, ~ emitting diode display. The alarm can be visual and/or audible. The timer circuit 12 is activated by closed circuit switch operations. Time slots are adjusted by - ., ~ ~, variable potentiometers (not shown) fitted on to the ,~ ;
circuit bo2rd ~f ~he timer integrated circuit. ;
..... .
~ . .
In operation ~f the anti-tamper device 8, if a person or art~cle break~s any of the front beams generated by the re~ro-reflec~ive scan sensors 2~, a ~ .
contact is made which ac~i~ates the timer circuit 12. ~;
I~ the rear beams genera*ed by the retroereflective scan sensors 2~ are not broken within the exact time alloca~ion in the timer circuit 12~ then tl~e alarl,l ~ystem is acti~ated. If either the front or the rear beam is broken indi~idually, then the alarm is again activated.
The alarm system is thus effective to }lel~
prevent persons attempting to defeat the detection apparatus 2 by passing through the frame 4 very slowly or very quickly, or by passing articles along the ground to try and passunderne~th the electromagnetic detection field. Thus, when the anti-tamper device 8 is fitted t~
the detection apparatus 2, the detection security afforde~
by the detection apparatus 2 is considerably increased.
It is to be appreciated that the emb~diment of the invention described above with re~erence to the accompanying drawings has been given by way of example only and that modif~cations may be effec~ed. Thus, for example, the anti-tamper device 8 can be made in ~ly . -, . ~ .. -, . " , ,, _ 9 desired Bi~e. me anti-tamper device 8 c~n be used ~ ;
with various types of security de~ection apparatus and ~:
it is not restricted to use with the detection apparatus 2. m e anti-tamper device ~ can be produced such that it is possible to differentiate be~ween alarms caused ~y , , ~,, the detection apparatus 2 and alarms caused by the ~-anti-tamper device 8. Various types of retroreflective `~
scan sensors may be employed. Should any wiring to the anti-t~mper device be disconnected, or tampered with, ~he alarm circuit will activate. A battery back up facility may be provided for use in the event of a mains fail condition. ` ~
': "``
. , : ,.
,., ~'~.
: . ~, . ...
, .~ ' '. .:
:, . :
, "
' . ' . .;
.., .
'" ''~,'"`';~
::
':''''' , .: . . ., ,. ,- .. ... . . ... .. . . . ..
me signal input detector device 14 ls for initiating ~ ~;
operation of the timer means consequent upon the detecti~
of a person or article. The timer oircuit 12 is such as to initiate operation of an alarm via an alarm out device 16 if an expected subsequent movement of the person ~r `-`~
article does not occur after the initiation of the timer -~
circuit 12 and within a time period set in the timer .
circuit 12.
Figure 2 shows how the anti-tamper device ~-8 is provided with first, se~ond and third reflector and retroreflective scan sensor arrangements 18,20~22. Each ~ `
reflector and retroreflective scan sensor arrangement 1~ 18,20,22 comprises a reflector 24 and a retroreflective scan sensor 26 which includes transmitter/receiver apparatus. ~igure 1 illustrates the position of the reflectors 24 and the retroreflective scan sensors 2 The control box 10 may include a light . . . :, ~ emitting diode display. The alarm can be visual and/or audible. The timer circuit 12 is activated by closed circuit switch operations. Time slots are adjusted by - ., ~ ~, variable potentiometers (not shown) fitted on to the ,~ ;
circuit bo2rd ~f ~he timer integrated circuit. ;
..... .
~ . .
In operation ~f the anti-tamper device 8, if a person or art~cle break~s any of the front beams generated by the re~ro-reflec~ive scan sensors 2~, a ~ .
contact is made which ac~i~ates the timer circuit 12. ~;
I~ the rear beams genera*ed by the retroereflective scan sensors 2~ are not broken within the exact time alloca~ion in the timer circuit 12~ then tl~e alarl,l ~ystem is acti~ated. If either the front or the rear beam is broken indi~idually, then the alarm is again activated.
The alarm system is thus effective to }lel~
prevent persons attempting to defeat the detection apparatus 2 by passing through the frame 4 very slowly or very quickly, or by passing articles along the ground to try and passunderne~th the electromagnetic detection field. Thus, when the anti-tamper device 8 is fitted t~
the detection apparatus 2, the detection security afforde~
by the detection apparatus 2 is considerably increased.
It is to be appreciated that the emb~diment of the invention described above with re~erence to the accompanying drawings has been given by way of example only and that modif~cations may be effec~ed. Thus, for example, the anti-tamper device 8 can be made in ~ly . -, . ~ .. -, . " , ,, _ 9 desired Bi~e. me anti-tamper device 8 c~n be used ~ ;
with various types of security de~ection apparatus and ~:
it is not restricted to use with the detection apparatus 2. m e anti-tamper device ~ can be produced such that it is possible to differentiate be~ween alarms caused ~y , , ~,, the detection apparatus 2 and alarms caused by the ~-anti-tamper device 8. Various types of retroreflective `~
scan sensors may be employed. Should any wiring to the anti-t~mper device be disconnected, or tampered with, ~he alarm circuit will activate. A battery back up facility may be provided for use in the event of a mains fail condition. ` ~
': "``
. , : ,.
,., ~'~.
: . ~, . ...
, .~ ' '. .:
:, . :
, "
' . ' . .;
.., .
'" ''~,'"`';~
::
':''''' , .: . . ., ,. ,- .. ... . . ... .. . . . ..
Claims (12)
1. Anti-tamper device for use with security detection apparatus characterised by timer means and detector means for initiating operation of the timer Deans consequent upon the detection of a person or article, and the timer means being such as to initiate the operation of an alarm if en expected subsequent movement of the person or article does not occur after initiation of the timer means and within a time period set in the timer means.
2. Anti-tamper device according to claim 1, characterised by at least one first reflector and retroreflective scan sensor arrangement for de-tecting the person of article, and includes at least one second reflect-or and retroreflective scan sensor arrangement for detecting the expect-ed subsequent movement.
3. Anti-tamper device according to claim 1 or 2, characterised in that the timer means is such as to initiate operation of the alarm if the person or article interrupts a first sensor beam from the first reflector and retroreflective scan arrangement and does not interrupt in the time period a second sensor beam from the second reflector find retroreflective scan arrangement, or if the person or article only separately interrupts the first or the second sensor beam.
4. Anti-tamper device according to claim 3, characterised in that the first sensor beam is a front sensor beam and the second sensor beam is a rear sensor beam.
5. Anti-tamper device according to one of the claims 1-4, character-ised in that the timer means are constituted by an integrated circuit with alarm outputs.
6. Anti-tamper device according to one of the claims 1 5, character-ised in that the timer means comprise time period adjuster means whereby the timer means can be provided with different time periods.
7. Anti-tamper device according to claim 6, characterised in that the time period adjuster means is at least one variable potentiometer.
8. Anti-tamper device according to one of the claims 1-6, character-ised in that the timer means are provided with a housing having a dis-play.
9. Anti-tamper device according to claim 8, characterised in that the housing has a lid, in which the housing is provided with relay means for generating an alarm consequent upon the unauthorised opening of the lid.
10. Anti-tamper device according to one of the claims 1-9, character-ised in that the detector means is a form of anti-shoplifting device utilising antenna to produce the detection field.
11. Anti-tamper device according to one of the claims 3-10, character-ised in that more than one first sensor beam in the first reflector and retroreflective scan arrangement and more than one sensor beam in the second reflector and retroreflective scan arrangement.
12. Security detection apparatus provided with the anti-tamper device according to one of the preceeding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB888828896A GB8828896D0 (en) | 1988-12-10 | 1988-12-10 | Anti-tamper device |
| GB8828896 | 1988-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2005068A1 true CA2005068A1 (en) | 1990-06-10 |
Family
ID=10648306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2005068 Abandoned CA2005068A1 (en) | 1988-12-10 | 1989-12-11 | Anti-tamper device |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0373716A3 (en) |
| CA (1) | CA2005068A1 (en) |
| FI (1) | FI895870A0 (en) |
| GB (2) | GB8828896D0 (en) |
| NO (1) | NO894926L (en) |
| PT (1) | PT92517A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2308482B (en) | 1995-12-20 | 2000-03-29 | Pyronix Ltd | Event detection device with fault monitoring capability |
| GB2422970B (en) | 2005-02-02 | 2008-09-10 | Pyronix Ltd | Detection apparatus |
| US20080278320A1 (en) | 2007-05-07 | 2008-11-13 | Sensormatic Electronics Corporation | Method and system for reduction of electronic article surveillance system false alarms |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2516777A1 (en) * | 1975-04-16 | 1976-10-28 | Elmar Ing Dorner | Safety detector for ski lift top station - uses beam emitters, sensors, barriers, and control system to disable lift when person passes barrier |
| US4272762A (en) * | 1979-09-17 | 1981-06-09 | Gte Laboratories Incorporated | Exit-entry sensing apparatus |
| FR2593310B1 (en) * | 1986-01-22 | 1988-07-15 | Stratel | ANTI-BREAKTHROUGH DEVICE FOR PROTECTED CLOSED ENCLOSURE INSTALLATIONS INCLUDING AN ACCESSIBLE REMOTE CONTROL BOX FROM THE EXTERIOR |
| NL8600738A (en) * | 1986-03-24 | 1987-10-16 | Nedap Nv | Suppression of false alarms due to touch. |
| GB8708167D0 (en) * | 1987-04-06 | 1987-05-13 | R V Ltd | Detection apparatus |
-
1988
- 1988-12-10 GB GB888828896A patent/GB8828896D0/en active Pending
-
1989
- 1989-07-03 GB GB898915241A patent/GB8915241D0/en active Pending
- 1989-12-07 PT PT9251789A patent/PT92517A/en not_active Application Discontinuation
- 1989-12-08 NO NO89894926A patent/NO894926L/en unknown
- 1989-12-08 EP EP19890203143 patent/EP0373716A3/en not_active Withdrawn
- 1989-12-08 FI FI895870A patent/FI895870A0/en not_active Application Discontinuation
- 1989-12-11 CA CA 2005068 patent/CA2005068A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB8915241D0 (en) | 1989-08-23 |
| FI895870A0 (en) | 1989-12-08 |
| EP0373716A2 (en) | 1990-06-20 |
| PT92517A (en) | 1990-06-29 |
| NO894926D0 (en) | 1989-12-08 |
| NO894926L (en) | 1990-06-11 |
| GB8828896D0 (en) | 1989-01-18 |
| EP0373716A3 (en) | 1991-06-19 |
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