EP0127645B1 - Brandmelder und dafür bestimmte elektrodenanordnung - Google Patents

Brandmelder und dafür bestimmte elektrodenanordnung Download PDF

Info

Publication number
EP0127645B1
EP0127645B1 EP83903778A EP83903778A EP0127645B1 EP 0127645 B1 EP0127645 B1 EP 0127645B1 EP 83903778 A EP83903778 A EP 83903778A EP 83903778 A EP83903778 A EP 83903778A EP 0127645 B1 EP0127645 B1 EP 0127645B1
Authority
EP
European Patent Office
Prior art keywords
electrode
measuring
electrodes
counter
fire detector
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
Application number
EP83903778A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0127645A1 (de
Inventor
Hans-Christoph Siegmann
Heinz Burtscher
Andreas Schmidt-Ott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SLM Investissements SA
Original Assignee
SLM Investissements SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SLM Investissements SA filed Critical SLM Investissements SA
Priority to AT83903778T priority Critical patent/ATE38732T1/de
Publication of EP0127645A1 publication Critical patent/EP0127645A1/de
Application granted granted Critical
Publication of EP0127645B1 publication Critical patent/EP0127645B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
    • G08B17/113—Constructional details

Definitions

  • the invention relates to a fire detector with at least two electrodes 1, 2, between which an electric field is generated by a DC voltage source 4, the opposing electrode surfaces delimiting a measuring space through which the air moved by convection can sweep through a room to be monitored, wherein one of the electrodes is designed as a measuring electrode and the other as a counterelectrode and at least one of the electrodes 1, 2 is provided with a circulation opening 11 for the ambient air to be monitored and / or consists of a plurality of partial electrodes 15 arranged in this way with gaps, whereby by these spaces can flow ambient air into the measuring space 9, 9a.
  • Fire detectors of a similar type are known and used in various designs. So shows z. B. US Pat. No. 2,408,051 (Donelian) describes a fire detector with two measuring rooms, small particles and small ions being “filtered out” electrically in the first measuring room and the air being ionized in the second measuring room with the aid of a radioactive preparation. The resulting conductivity is reduced if smoke is present because ions attach to the difficult-to-move smoke particles. If the reduction in conductivity in the ionization chamber reaches a threshold, the alarm is triggered. In the aforementioned US Pat. No.
  • the electrodes which delimit the measuring spaces are connected in series in the manner of a capacitive voltage divider between the positive and negative poles of a DC voltage source.
  • relatively low field strengths of about 40 or 50 volts / cm are provided in the first measuring room.
  • the fire detector according to this US-PS requires the two measuring chambers, whereby the disadvantage of the second measuring chamber provided with radioactive material is already known with regard to environmental influences.
  • the arrangement is also complex in construction.
  • Ion measuring devices or measuring arrangements for determining the mobility of particles are known, as is the case e.g. from US-PS 4114088, but so far the use of such measuring devices as fire detectors has not been proposed, nor are they suitable for such use due to the design. Rather, fire detectors with ionization chambers dominate, especially using radioactive preparations, although the need for simplified fire detectors that are less polluting and, above all, work without radioactive substances has been constant and has existed for a long time. This is also evident from Scheidweiler's article in “Dust Cleanliness Air, Vol. 32 No. 11 November, 1972technische
  • a fire detector is also known, with at least two electrodes, between which an electric field is generated by a DC voltage source, the opposite electrode surfaces delimiting a measuring space through which the air moved by convection is one to be monitored, and wherein one of the electrodes is designed as a measuring electrode and the other as a counter electrode and at least one of the electrodes is provided with circulation openings for the ambient air to be monitored and / or consists of a plurality of partial electrodes arranged in this way with gaps, that ambient air can flow into the measuring space through these spaces.
  • a fire detector only reacts to sudden changes in conductivity in the presence of smoke. Conversely, the fire detector would not react to a net charge of zero, even if the conductivity suddenly changed in the presence of smoke.
  • the invention is accordingly based on the object of providing an improved, highly sensitive and substantially simplified fire detector and an electrode arrangement intended therefor, which can be used for ionization without radioactive preparations.
  • a current measuring arrangement and evaluation circuit is provided, that the fire detector has a compensation electrode which delimits a compensation space and is designed as a shield for the measuring and counter electrodes, and that the DC voltage source, on the one hand, directly or indirectly with the counter electrode and on the other hand, is connected to a current measuring arrangement, and that the measuring electrode is connected to the input of the current measuring arrangement without a direct connection to the direct voltage source.
  • the invention is based for the first time in an optimally simple manner on the principle that smoke particles from burns are in principle highly electrically charged. This is due to the fact that positive and negative small ions attach to the particles. These are constantly formed in the air even in normal environments, especially through cosmic rays and natural radioactivity.
  • the concentration of the particles of radius R with p elementary charges is accordingly
  • n R is the total concentration of the neutral particles with radius R
  • k is the Boltzmann constant
  • T is the absolute temperature.
  • charging the smoke means the mean value of the particle charge.
  • the fire detector according to the invention measures the amount of particle charge of a certain sign and therefore also functions when the net charge of the smoke is zero. With such a charge distribution, there are as many positive as negative ions on the smoke particles. According to the invention, reliable detection of the smoke in the field between the measuring electrode and counterelectrode is now ensured by electrostatically separating positive and negative particles and measuring the charge of a sign or by measuring the change in conductivity caused by the smoke.
  • the electric current thus generated is relatively small at field strengths which do not yet lead to glow discharge, but at least amount to 100 volts / cm, but can easily be measured with electronic amplifiers or small electroscopes.
  • the electrode spacing is advantageously less than 10 mm, but more than 1 mm. It has been shown that this particular dimensioning enables a number of advantageous properties to be achieved: the relatively small measuring space provides good shielding of the measuring electrode against influence by net charge; on the other hand, the distance is large enough to avoid false reports from possibly deposited dust or soot particles. In addition, it has been shown that, with such an electrode spacing, it is also possible to work with voltages in an optimal range, which on the one hand ensure reliable separation and separation of charged particles and on the other hand avoid contamination through constant attraction and deposition of dust particles.
  • the invention is advantageously not based on the measurement of the excess or net charge practiced in known devices, but rather on the charge measurement after electrostatic separation of positive and negative particles.
  • An auxiliary electrode arrangement can advantageously be provided, which pre-separates small and / or charged particles carried by slow flow before they can get into the measuring space. In this way, the sensitivity to small smoke sources that cause small particles and / or only slow convective flow (cigarettes) can be reduced.
  • the net charge suppression can also be achieved or further improved by providing a compensation space that is delimited on the one hand by the measuring electrode and on the other hand by a compensation electrode.
  • the measuring electrode is influenced by the influence of net charge e.g. shielded in large clouds of smoke on both sides and only that is measured in a relatively small volume limited by the measuring space and / or the compensation space.
  • the compensation electrode can simultaneously be designed as a shield for the electrode arrangement.
  • the influences described above by the net charge or by influence can even be completely compensated for if the compensation space is arranged at approximately the same distance from the measuring electrode as the measurement space and is also able to absorb approximately the same volume of ambient air flowing through. This means that the influence of gases flowing in the measuring space with a high net charge is compensated for by the influence of reversed polarity caused by gases flowing away in the compensation space.
  • Compensation can also advantageously be achieved if the measuring electrode is arranged with respect to the air flow in such a way that the air flow sweeps the measuring electrode twice, but from opposite sides ten strikes, or flows through the electrode, so that influence currents, which occur due to net charge of the ambient air passing through or of smoke clouds in the measuring electrode, are compensated for.
  • the electrode is designed as an electrically closed circle transverse to the direction of flow.
  • an electrode arrangement for the fire detector according to the invention is a measuring electrode and / or compensation electrode designed as a grid; this facilitates convection and prevents the air or gas in the measuring room from becoming depleted of charges. In addition, it is ensured that, especially in connection with the principle of compensation through a compensation space and / or double flow through the measuring electrode described above, simple compensation of net charge influences is made possible.
  • the measuring electrode can also be constructed from a plurality of electrically connected partial electrodes through which air or gas clouds flow in such a way that the influences of influence caused by the net charge in the partial electrodes cancel each other out.
  • the measuring electrode is arranged between two counter electrodes, the two counter electrodes being connected to the direct voltage source and the measuring electrode being provided between the counter electrodes and being connected to the input of the measuring arrangement. It is thereby achieved that the fields in the two measuring spaces between the two counter electrodes and the measuring electrode run symmetrically to the latter, i.e. in other words, particles of the same polarity charged from both measuring rooms hit the measuring electrode. This guarantees high sensitivity in particular.
  • the measuring electrode is connected to the input of the measuring arrangement and is therefore virtually at the potential of the other side of the measuring arrangement. It can advantageously be mechanically rigidly connected to an electrode housing and / or the counter electrodes by means of insulation elements, the insulation elements being interrupted by electrically conductive parts which are connected to the other side of the measuring electrode. This prevents leakage currents from being measured on the insulation elements.
  • FIG. 1 shows the basic illustration of a fire detector according to the invention with a measuring electrode 1, a counter electrode 2, a schematically illustrated measuring arrangement 3, which at the same time serves to trigger the alarm in a known manner, and its DC voltage source 4.
  • Measuring electrode 1 and counter electrode 2 are fastened by means of insulation elements 6 to a holder 7, which in turn is connected to a base plate 8.
  • the holder 7 is electrically conductive and is grounded, so that no leakage currents can flow between the measuring electrode 1 and the counterelectrode 2 via the insulation elements 6, since the measuring electrode is - but only virtually - at ground potential via the measuring arrangement 3. This is advantageous in view of the extremely low flowing currents.
  • the distance between the measuring electrode 1 and counter electrode 2 is 5 mm, the voltage of the direct voltage source 4 is 500 volts, so that there is a field strength of 1000 volts / cm between the two electrodes 1 and 2. If now charged smoke particles get into the measuring space 9 between the measuring electrode 1 and the counter electrode 2, the electric field causes the positive and negative particles to move to the two electrodes. This charge movement (charge drift) influences a current into the measuring electrode 1, which is measured in the measuring arrangement 3.
  • the measuring electrodes 1 and the counter electrode 2 are designed as approximately square plates with an area of 40 cm 2 each. Of course, the area of the electrodes can be changed depending on the requirement and the desired sensitivity of the measuring arrangement, as can also be seen, for example, from the exemplary embodiment according to FIG.
  • the overall arrangement is surrounded by a shield 5, which is also grounded. This not only ensures mechanical protection of the arrangement, but also influences of errors due to net charging of a schematically indicated smoke cloud 30 are compensated to the extent that influences from the charge cloud outside the shield 5 are kept away from the measuring electrode 1 and thus no influence currents can arise.
  • both the measuring electrode 1 and the counter electrode 2 are provided with a multiplicity of holes 11, which allow the smoke to flow through the measuring space 9 coming from the horizontal direction as well as from the vertical direction solely due to the convection.
  • Figure 2 shows an arrangement in which the base plate 8 is arranged as a compensation electrode in parallel and at the same distance as the counter electrode 2 to the measuring electrode 1.
  • Base plate 8, measuring electrode 1 and counter electrode 2 are (part not shown) each formed as a perforated plate. Due to the arrangement, flowing gas clouds with a net charge are initially shielded from the outside by the shield 5. In addition, there is approximately the same amount of gas flowing through each in the measurement space 9 and in the compensation space 10, as a result of which the amount of influence by net charge is approximately the same. However, since gas flowing through in the direction of the arrow moves towards the measuring electrode 1 in the measuring space 9, but moves away from the measuring electrode 1 in the compensation space 10, the resulting influencing currents each have opposite polarity, so that the effects of net charge are compensated for.
  • FIG. 3 shows an exemplary embodiment in which two counter electrodes 2 enclose a measuring electrode 1 between them and thereby delimit two measuring spaces 9 and 9 '.
  • the counter electrodes 2 are designed as perforated plates, lie on ground and at the same time serve to shield the arrangement from the outside.
  • the measuring electrode 1 is fastened to the base plate 8 by an insulator arrangement, not shown. Since both counter electrodes 2 are at the same potential with respect to the measuring electrode 1, the field distribution is symmetrical, i.e. that both in the measuring space 9 and in the measuring space 9 ′, ions of negative polarity drift onto the measuring electrode 1 and the resulting influent current in the measuring arrangement 3 can be determined.
  • the sensitivity of the arrangement is increased due to the two measuring rooms 9 and 9 '. In addition, compensation of net charge influences is ensured by the symmetry of the arrangement.
  • Figure 4 shows an arrangement in which a cylindrical, symmetrical design of all parts, i.e. the shield 5, the measuring electrode 1 and the counter electrodes 2 is provided.
  • the outer of the two counter electrodes 2 is fastened to the shield 5 by means of bolts 12 made of insulation material.
  • the measuring electrode 1 and the second counter electrode 2 are mechanically connected to one another by means of insulation elements 13a, 13b, which are also bolt-shaped.
  • a metal disk 14 is arranged between the insulation elements 13a and 13b, which lies on ground. Leakage currents between the counter electrodes 2 and the measuring electrode 1 are thus avoided.
  • the cylindrical configuration of the counter electrode 2 with a base plate 2a which also corresponds to the configuration of the other counter electrode 2 or the measuring electrode 1 and the shield 5, is shown schematically in the upper section of FIG. 4.
  • This arrangement also has the advantage that the insulation elements are not directly exposed to the air flow and are therefore protected against contamination.
  • a gas cloud with charged smoke particles flowing through the arrangement in the direction of the arrow strikes the outside of the measuring electrode 1 (at A) coming from the right and the inside of the measuring electrode 1 (at B) before leaving the arrangement. Since the measuring electrode 1 is cylindrical and constitutes a closed circuit, influence currents due to net charge will accordingly have opposite polarity and will be automatically compensated.
  • shield 5 which is also designed as a perforated plate
  • outer counter electrode 2 delimit an annular compensation space 14, which, however, has a smaller field strength than the two measurement spaces 9 and 9 'due to the greater distance. Small, slowly flowing charged particles are therefore already separated in the compensation space 14 before they reach the measurement space 9 or 9 '. This results in a size-selective pre-separation, which can be of great advantage to reduce false alarms.
  • FIG. 5 shows an exemplary embodiment of a measuring electrode which consists of a plurality of punched-out sheet metal strips 15 which are connected to one another by means of an electrically conductive rail 16.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
EP83903778A 1982-12-03 1983-12-02 Brandmelder und dafür bestimmte elektrodenanordnung Expired EP0127645B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83903778T ATE38732T1 (de) 1982-12-03 1983-12-02 Brandmelder und dafuer bestimmte elektrodenanordnung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7028/82A CH666135A5 (de) 1982-12-03 1982-12-03 Brandmelder.
CH7028/82 1982-12-03

Publications (2)

Publication Number Publication Date
EP0127645A1 EP0127645A1 (de) 1984-12-12
EP0127645B1 true EP0127645B1 (de) 1988-11-17

Family

ID=4318798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83903778A Expired EP0127645B1 (de) 1982-12-03 1983-12-02 Brandmelder und dafür bestimmte elektrodenanordnung

Country Status (7)

Country Link
US (1) US4652866A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0127645B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS60500073A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AU (1) AU572517B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH666135A5 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE3378505D1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
WO (1) WO1984002215A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1267735A (en) * 1986-01-17 1990-04-10 Nohmi Bosai Kogyo Co., Ltd. Ionization type-smoke detector
GB9703024D0 (en) * 1997-02-14 1997-04-02 Council Cent Lab Res Councils Charged particle analysis
US6828794B2 (en) * 2002-10-24 2004-12-07 Cambustion Limited Electrostatic particle measurement
GB0321039D0 (en) * 2003-09-09 2003-10-08 Council Cent Lab Res Councils Ionising particle analyser
US9013316B2 (en) * 2011-07-28 2015-04-21 Finsecur Smoke detector
US9257980B2 (en) 2011-10-06 2016-02-09 Microchip Technology Incorporated Measuring capacitance of a capacitive sensor with a microcontroller having digital outputs for driving a guard ring
US9467141B2 (en) 2011-10-07 2016-10-11 Microchip Technology Incorporated Measuring capacitance of a capacitive sensor with a microcontroller having an analog output for driving a guard ring
US9071264B2 (en) 2011-10-06 2015-06-30 Microchip Technology Incorporated Microcontroller with sequencer driven analog-to-digital converter
US9437093B2 (en) 2011-10-06 2016-09-06 Microchip Technology Incorporated Differential current measurements to determine ION current in the presence of leakage current
US9252769B2 (en) 2011-10-07 2016-02-02 Microchip Technology Incorporated Microcontroller with optimized ADC controller
US8847802B2 (en) 2011-10-06 2014-09-30 Microchip Technology Incorporated Microcontroller ADC with a variable sample and hold capacitor
US9207209B2 (en) 2011-12-14 2015-12-08 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
US9189940B2 (en) 2011-12-14 2015-11-17 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
US9176088B2 (en) 2011-12-14 2015-11-03 Microchip Technology Incorporated Method and apparatus for detecting smoke in an ion chamber
US9823280B2 (en) 2011-12-21 2017-11-21 Microchip Technology Incorporated Current sensing with internal ADC capacitor
WO2014016473A1 (fr) * 2012-07-24 2014-01-30 Finsecur S.A. Détecteur de fumée
US8884771B2 (en) * 2012-08-01 2014-11-11 Microchip Technology Incorporated Smoke detection using change in permittivity of capacitor air dielectric
DE102014019773B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mittels des Displays eines Mobiltelefons
DE102014019172B4 (de) 2014-12-17 2023-12-07 Elmos Semiconductor Se Vorrichtung und Verfahren zur Unterscheidung von festen Objekten, Kochdunst und Rauch mit einem kompensierenden optischen Messsystem
RU2596955C1 (ru) * 2015-08-13 2016-09-10 Акционерное общество "Научно-производственное предприятие "Радар ммс" Электроиндукционный пожарный извещатель

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3262106A (en) * 1963-01-21 1966-07-19 Robert B P Crawford Gaseous hazard detector system and apparatus
IL22673A (en) * 1964-12-27 1968-06-20 Jaffe A Sensitive smoke and fire detector
FR2034800A1 (en) * 1969-03-11 1970-12-18 Eaton Yale & Towne Detecting combustion products in air, for - fire location
US3754219A (en) * 1972-01-03 1973-08-21 Johnson Service Co High impedance gaseous ion sensing and detection system
AU472425B2 (en) * 1972-02-02 1976-05-27 Taisuke Satsutani Measurement ofthe ion content and electric field ofthe atmosphere
US3949390A (en) * 1974-06-05 1976-04-06 Rca Corporation High voltage aerosol detector
US4134111A (en) * 1976-12-16 1979-01-09 N.V. Tools Limited Aerosol detector and method
US4114088A (en) * 1977-02-28 1978-09-12 Cecil Alfred Laws Atmospheric ion density measurement
US4387369A (en) * 1978-10-11 1983-06-07 Johnson Controls, Inc. Broad spectrum charged electric field polar gas sensing and detection system

Also Published As

Publication number Publication date
WO1984002215A1 (en) 1984-06-07
US4652866A (en) 1987-03-24
AU2983784A (en) 1986-01-02
JPS6356596B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1988-11-08
CH666135A5 (de) 1988-06-30
JPS60500073A (ja) 1985-01-17
DE3378505D1 (en) 1988-12-22
EP0127645A1 (de) 1984-12-12
AU572517B2 (en) 1988-05-12

Similar Documents

Publication Publication Date Title
EP0127645B1 (de) Brandmelder und dafür bestimmte elektrodenanordnung
DE68926451T2 (de) Ionenbeweglichkeitsdetektor
DE2644688C2 (de) Meßanordnung für einen Strahlstrom mit einem einen Faradaykäfig aufweisenden Sammelelektrodensystem
DE2939286C2 (de) Gerät zum Feststellen gas- oder dampfförmiger Spurenelemente
DE69001719T2 (de) Elektrostatischer Detektor von Aerosolen.
DE19909333A1 (de) Gerät und Verfahren zum Neutralisieren geladener Teilchen
DE112012000846T5 (de) Korona-Entladungsvorrichtung und Ionenmobilitätsspektrometer, das eine derartige Korona-Entladungsvorrichtung aufweist
DE2415479A1 (de) Ionisationsfeuermelder
DE2701606C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE2934408A1 (de) Ionenquelle mit kaltkathode und damit ausgeruestetes massenspektrometer
EP0015495A1 (de) Elektroneneinfangdetektor
DE4111877A1 (de) Ionisationsmanometer und zugehoerige steuerschaltung
DE19730896A1 (de) Ionen-Mobilitätsspektrometer in Zentripetalanordnung
DE2458025C2 (de) Analysevorrichtung für eine Oberflächenschicht
DE2608760A1 (de) Einrichtung und verfahren zum nachweis von aerosolen
DE102005007746B4 (de) Ionenmobilitätsspektrometer mit parallel verlaufender Driftgas- und Ionenträgergasströmung
DE2743761A1 (de) Rauchdetektor
DE1259227B (de) Ionisationsfeuermelder mit erhoehter Rauchempfindlichkeit
DE1928874B2 (de) Ionisationsfeuermelder
EP0111012B1 (de) Rauchsensor des ionisationstyps
DE4410090C1 (de) Rauchmelder
DE19511958C2 (de) Massenspektrometer
DE2700906C2 (de) Anordnung zur Brandmeldung
DE2546970C3 (de) Ionisations-Rauchmelder
AT209447B (de) Elektrofilter

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI NL SE

17P Request for examination filed

Effective date: 19841102

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SLM INVESTISSEMENTS SA

17Q First examination report despatched

Effective date: 19861222

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB LI NL SE

REF Corresponds to:

Ref document number: 38732

Country of ref document: AT

Date of ref document: 19881215

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3378505

Country of ref document: DE

Date of ref document: 19881222

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19941114

Year of fee payment: 12

Ref country code: GB

Payment date: 19941114

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19941208

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19941216

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19941219

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19941228

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19941230

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19941231

Year of fee payment: 12

EAL Se: european patent in force in sweden

Ref document number: 83903778.5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19951202

Ref country code: AT

Effective date: 19951202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19951203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19951231

Ref country code: CH

Effective date: 19951231

Ref country code: BE

Effective date: 19951231

BERE Be: lapsed

Owner name: S.A. SLM INVESTISSEMENTS

Effective date: 19951231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19960701

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19951202

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960830

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19960701

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960903

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST