EP0255117A1 - Smoke detector for early fire detection - Google Patents

Smoke detector for early fire detection Download PDF

Info

Publication number
EP0255117A1
EP0255117A1 EP87110952A EP87110952A EP0255117A1 EP 0255117 A1 EP0255117 A1 EP 0255117A1 EP 87110952 A EP87110952 A EP 87110952A EP 87110952 A EP87110952 A EP 87110952A EP 0255117 A1 EP0255117 A1 EP 0255117A1
Authority
EP
European Patent Office
Prior art keywords
funnel
smoke detector
detector
neck
mouth
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.)
Withdrawn
Application number
EP87110952A
Other languages
German (de)
French (fr)
Inventor
Klaus Kaiser
Peer Dr.-Ing. Thilo
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0255117A1 publication Critical patent/EP0255117A1/en
Withdrawn legal-status Critical Current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
    • G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
    • G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
    • 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 smoke detector for early fire detection with a measuring chamber located in a housing and a cover cap.
  • smoke detectors are mainly used, which either work according to the ionization principle or according to the scattered light principle.
  • the actual measuring system and the associated measuring chamber are protected within a housing, which is very often provided with a housing cover or cap.
  • the task of the housing is on the one hand to allow the smoke to penetrate as freely as possible, but on the other hand to shield as well as possible disturbing influences such as dust, extraneous light in the case of the scattered light detector or wind in the case of the ionization detector.
  • Particular difficulties arise in this case at low flow speeds, such as occur in smoldering fires, in order to smoke in the detector, i.e. into the measuring chamber. Below a certain air flow rate, the flow in the detector breaks down and the smoke is transported very slowly by diffusion. This has the disadvantage that swell fires in particular cannot be detected sufficiently early.
  • Automatic fire detectors have a variety of different housings for the penetration of smoke known, which are all based on the principle of a labyrinth, which significantly reduces the flow velocity in the detector compared to the flow velocity outside the detector. These detectors are either "open” to the outside and therefore suitable for low flow velocities, as is the case with swelling fires, but prone to failure. If the measuring chamber is more "closed” to the outside through the housing, the detector is safe against interference, but is very slow or insensitive to smoldering fires.
  • the object of the invention is to design a smoke detector described in the introduction in such a way that it has an improved penetration behavior or a higher sensitivity to smoldering fires and avoids the disadvantages described above.
  • the housing and the cover cap together form an air inlet opening which is formed by a funnel which is open to the outside and narrows towards the measuring chamber and has a grid.
  • the flow properties of the air are advantageously used, in particular if the funnel is rotationally symmetrical.
  • the funnel-shaped opening ensures that the air carrying the smoke is accelerated in the ratio of the cross sections from the funnel mouth to the funnel neck at low flow speeds. As a result, the smoke penetrates very quickly into the detector and thus into the measuring chamber. The critical speed limit at which the flow in the detector breaks down is not exceeded.
  • the detector therefore reacts very quickly to smoldering fires and is therefore very sensitive to smoldering fires.
  • Another advantage consists in that at high flow velocities at the edges of the narrow funnel neck, which brake the inflowing air, so that the flow in the funnel is not accelerated.
  • the funnel mouth is expediently provided with a large inlet cross section relative to the funnel neck, so that the advantages already mentioned above are achieved.
  • the grille which can be located either on the funnel mouth or a little further inside the detector on the funnel neck, serves on the one hand to keep out insects and extraneous light.
  • the grille has the advantage, especially if it is arranged on the funnel neck, that vortices also arise on the grille itself, which at high flow speeds brake the air passing through so much that the detector itself has a "slowly” flowing air as in conventional ones Notify.
  • Another advantage is also that in this way any dust particles carried in the air do not get into the measuring chamber, but rather are "thrown out” and deposited on the funnel walls.
  • a known labyrinth LAB is schematically shown in side view in section, as it is formed by lamellae LA.
  • Fig. 3 shows schematically the air inlet opening of a smoke detector according to the invention.
  • the parts of the detector which are not relevant to the invention, such as detector base, detector measuring system, have not been shown.
  • the measuring chamber MK is located inside the housing GH.
  • the housing GH or the detector is covered with the cover cap AK and thus also the measuring chamber MK.
  • the air inlet opening is formed by a rotationally symmetrical funnel T, which has a relatively large funnel mouth TM on the outside. Inside, the funnel neck TH is very small in relation to the funnel mouth.
  • the grid can either be on the funnel neck, designated g, or on the funnel mouth, designated G, or be arranged in between.

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)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The detector has inter alia a casing in which there is a measurement chamber and a cover hood which covers the casing and the alarm with the measurement chamber. The casing (GH) and the cover hood (AK) together form an air inlet opening consisting of an axially symmetrical funnel (T) open towards the outside which narrows towards the measurement chamber (MK) and has a grating (G and g). The cross section of the funnel mouth (TM) is large in relation to the cross section of the funnel neck (TK). The grating can be arranged either in the mouth (TM) or in the neck (TH) of the funnel. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Rauchmelder zur Brandfrüherkennung mit einer in einem Gehäuse befindlichen Meßkammer und einer Abdeckkappe.The invention relates to a smoke detector for early fire detection with a measuring chamber located in a housing and a cover cap.

Zur Brandfrüherkennung werden vorwiegend Rauchmelder verwendet, die entweder nach dem Ionisationsprinzip oder nach dem Streulichtprinzip arbeiten. Bei beiden Brand­meldertypen befindet sich das eigentliche Meßsystem und die zugehörige Meßkammer geschützt innerhalb eines Gehäuses, das sehr häufig mit einem Gehäusedeckel bzw. (-kappe) versehen ist. Dem Gehäuse kommt die Aufgabe zu, einerseits den Rauch möglichst ungehindert eindringen zu lassen, andererseits aber störende Einflüsse, wie Staub, Fremdlicht im Falle des Streulichtmelders oder Wind im Falle des Ionisationsmelders möglichst gut abzu­schirmen. Besondere Schwierigkeiten ergeben sich hierbei bei niedrigen Strömungsgeschwindigkeiten, wie sie bei Schwelbränden auftreten, um Rauch in den Melder, d.h. in die Meßkammer, zu transportieren. Unterhalb einer bestimmten Strömungsgeschwindigkeit der Luft bricht die Strömung im Melder zusammen und der Rauchtransport erfolgt daher nur noch sehr langsam durch Diffusion. Dies hat den Nachteil, daß insbesondere Schwellbrände nicht hinreichend früh erkannt werden können.For early fire detection, smoke detectors are mainly used, which either work according to the ionization principle or according to the scattered light principle. In both types of fire detectors, the actual measuring system and the associated measuring chamber are protected within a housing, which is very often provided with a housing cover or cap. The task of the housing is on the one hand to allow the smoke to penetrate as freely as possible, but on the other hand to shield as well as possible disturbing influences such as dust, extraneous light in the case of the scattered light detector or wind in the case of the ionization detector. Particular difficulties arise in this case at low flow speeds, such as occur in smoldering fires, in order to smoke in the detector, i.e. into the measuring chamber. Below a certain air flow rate, the flow in the detector breaks down and the smoke is transported very slowly by diffusion. This has the disadvantage that swell fires in particular cannot be detected sufficiently early.

Für das Eindringen des Rauchs sind bei automatischen Brandmeldern eine Vielzahl von unterschiedlichen Gehäusen bekannt, die alle auf dem Prinzip eines Labyrinths beruhen, welches die Strömungsgeschwindigkeit im Melder gegenüber der Strömungsgeschwindigkeit außerhalb des Melders wesentlich reduziert. Dabei sind diese Melder nach außen hin entweder "offen" und damit für niedrige Strömungsgeschwindigkeiten, wie dies bei Schwellbränden der Fall ist, geeignet, jedoch störanfällig. Ist die Meßkammer durch das Gehäuse nach außen hin mehr "ge­schlossen", so ist der Melder gegen Störeinflüsse sicher, aber bei Schwelbränden sehr langsam bzw. unempfindlich.Automatic fire detectors have a variety of different housings for the penetration of smoke known, which are all based on the principle of a labyrinth, which significantly reduces the flow velocity in the detector compared to the flow velocity outside the detector. These detectors are either "open" to the outside and therefore suitable for low flow velocities, as is the case with swelling fires, but prone to failure. If the measuring chamber is more "closed" to the outside through the housing, the detector is safe against interference, but is very slow or insensitive to smoldering fires.

Aufgabe der Erfindung ist es, einen eingangs beschrie­benen Rauchmelder so auszugestalten, daß er ein ver­bessertes Eindringverhalten bzw. eine höhere Empfind­lichkeit bei Schwelbränden aufweist und die oben ge­schilderten Nachteile vermeidet.The object of the invention is to design a smoke detector described in the introduction in such a way that it has an improved penetration behavior or a higher sensitivity to smoldering fires and avoids the disadvantages described above.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das Gehäuse und die Abdeckkappe zusammen eine Luftein­trittsöffnung bilden, die von einem nach außen hin offenen Trichter gebildet ist, der sich zur Meßkammer hin verengt und ein Gitter aufweist. Mit der erfindungsge­mäßen Ausgestaltung der Lufteintrittsöffnung beim Rauch­melder werden die Strömungseigenschaften der Luft in vorteilhafter Weise genützt, insbesondere wenn der Trichter rotationssymmetrisch ausgebildet ist. Durch die trichterförmige Öffnung wird erreicht, daß bei niedriger Strömungsgeschwindigkeit die den Rauch tragende Luft im Verhältnis der Querschnitte von Trichtermund zu Trichter­hals beschleunigt wird. Dadurch dringt in vorteilhafter Weise der Rauch sehr rasch in den Melder und damit in die Meßkammer ein. Dabei wird die kritische Geschwindig­keitsgrenze nicht unterschritten, bei der die Strömung im Melder zusammenbricht. Der Melder reagiert also sehr rasch auf Schwelbrände und ist daher für Schwelbrände sehr empfindlich. Ein weiterer Vorteil besteht darin, daß bei hoher Strömungsgeschwindigkeit an den Kanten des engen Trichterhalses Wirbel entstehen, die die einströmende Luft bremsen, so daß die Strömung im Trichter dann nicht beschleunigt wird.According to the invention this object is achieved in that the housing and the cover cap together form an air inlet opening which is formed by a funnel which is open to the outside and narrows towards the measuring chamber and has a grid. With the configuration of the air inlet opening in the smoke detector according to the invention, the flow properties of the air are advantageously used, in particular if the funnel is rotationally symmetrical. The funnel-shaped opening ensures that the air carrying the smoke is accelerated in the ratio of the cross sections from the funnel mouth to the funnel neck at low flow speeds. As a result, the smoke penetrates very quickly into the detector and thus into the measuring chamber. The critical speed limit at which the flow in the detector breaks down is not exceeded. The detector therefore reacts very quickly to smoldering fires and is therefore very sensitive to smoldering fires. Another advantage consists in that at high flow velocities at the edges of the narrow funnel neck, which brake the inflowing air, so that the flow in the funnel is not accelerated.

Zweckmäßigerweise ist der Trichtermund gegenüber dem Trichterhals mit einem großen Einlaßquerschnitt versehen, so daß die oben schon genannten Vorteile erreicht werden. Das Gitter, das entweder am Trichtermund oder etwas weiter innen im Melder am Trichterhals angeordnet sein kann, dient einerseits zum Abhalten von Insekten und Fremdlicht. Andererseits hat das Gitter den Vorteil, ins­besondere wenn es am Trichterhals angeordnet ist, daß auch am Gitter selbst Wirbel entstehen, die bei einer hohen Strömungsgeschwindigkeit die durchtretende Luft so stark bremsen, daß im Melder selbst eine ähnlich "langsam" strömende Luft herrscht wie bei herkömmli­chen Meldern. Ein weiterer Vorteil besteht auch noch darin, daß auf diese Weise evtl. in der Luft mitge­führte Staubpartikel nicht in die Meßkammer gelangen, sondern vielmehr "ausgeschleudert" und an den Trichter­wänden abgelagert werden.The funnel mouth is expediently provided with a large inlet cross section relative to the funnel neck, so that the advantages already mentioned above are achieved. The grille, which can be located either on the funnel mouth or a little further inside the detector on the funnel neck, serves on the one hand to keep out insects and extraneous light. On the other hand, the grille has the advantage, especially if it is arranged on the funnel neck, that vortices also arise on the grille itself, which at high flow speeds brake the air passing through so much that the detector itself has a "slowly" flowing air as in conventional ones Notify. Another advantage is also that in this way any dust particles carried in the air do not get into the measuring chamber, but rather are "thrown out" and deposited on the funnel walls.

Anhand der Zeichnung wird die Erfindung erläutert. Dabei zeigen

  • Fig. 1 und 2 ein bekanntes Labyrinth herkömmlicher Melder und
  • Fig. 3 die erfindungsgemäße Ausbildung der Luftein­trittsöffnung eines Rauchmelders.
The invention is explained on the basis of the drawing. Show
  • 1 and 2 a known labyrinth of conventional detectors and
  • Fig. 3 shows the inventive design of the air inlet opening of a smoke detector.

In Fig. 1 ist schematisch in Seitenansicht im Schnitt ein bekanntes Labyrinth LAB gezeigt, wie es durch Lamellen LA gebildet ist. Dabei kann ein Teil der Lamellen LA am Gehäuse GH selbst, ein anderer Teil der Lamellen an der Abdeckkappe AK angeordnet sein. Fig. 2 zeigt entsprechend dazu das bekannte Labyrinth in Draufsicht.In Fig. 1, a known labyrinth LAB is schematically shown in side view in section, as it is formed by lamellae LA. Part of the Slats LA on the housing GH itself, another part of the slats on the cover cap AK. 2 accordingly shows the known labyrinth in a top view.

Fig. 3 zeigt schematisch die erfindungsgemäße Luftein­trittsöffnung eines Rauchmelders. Die für die Erfindung nicht relevanten Teile des Melders, wie Meldersockel, Meldermeßsystem, wurden nicht dargestellt. Innerhalb des Gehäuses GH befindet sich die Meßkammer MK. Das Gehäuse GH bzw. der Melder ist mit der Abdeckkappe AK und damit auch die Meßkammer MK abgedeckt. Die Lufteintrittsöffnung ist von einem rotationssymmetrischen Trichter T gebildet, der außen einen relativ großen Trichtermund TM besitzt. Im Inneren ist der Trichterhals TH im Verhältnis zum Trichtermund sehr klein. Das Gitter kann entweder am Trichterhals, mit g bezeichnet, oder am Trichtermund, mit G bezeichnet, bzw. dazwischen angeordnet sein. Die mit der erfindungsgemäßen Ausgestaltung der Melder­eintrittsöffnung erreichten Vorteile wurden oben bereits beschrieben.Fig. 3 shows schematically the air inlet opening of a smoke detector according to the invention. The parts of the detector which are not relevant to the invention, such as detector base, detector measuring system, have not been shown. The measuring chamber MK is located inside the housing GH. The housing GH or the detector is covered with the cover cap AK and thus also the measuring chamber MK. The air inlet opening is formed by a rotationally symmetrical funnel T, which has a relatively large funnel mouth TM on the outside. Inside, the funnel neck TH is very small in relation to the funnel mouth. The grid can either be on the funnel neck, designated g, or on the funnel mouth, designated G, or be arranged in between. The advantages achieved with the configuration of the detector entry opening according to the invention have already been described above.

Claims (6)

1. Rauchmelder zur Brandfrüherkennung mit einer in einem Gehäuse (GH) befindlichen Meßkammer (MK) und einer Ab­deckkappe (AK),
dadurch gekennzeichnet, daß das Gehäuse (GH) und die Abdeckkappe (AK) zusammen eine Lufteintrittsöffnung bilden, die von einem nach außen hin offenen Trichter gebildet ist, der sich zur Meßkammer (MK) hin verengt und ein Gitter (G bzw. g) aufweist.1. Smoke detector for early fire detection with a measuring chamber (MK) in a housing (GH) and a cover cap (AK),
characterized in that the housing (GH) and the cover cap (AK) together form an air inlet opening which is formed by an outwardly open funnel which narrows towards the measuring chamber (MK) and has a grating (G or g) . 2. Rauchmelder nach Anspruch 1,
dadurch gekennzeichnet, daß der Trichter rotationssymmetrisch ausgebildet ist.2. Smoke detector according to claim 1,
characterized in that the funnel is rotationally symmetrical. 3. Rauchmelder nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß der Trichter (T) einen Trichtermund (TM) mit einem ver­hältnismäßig großen Einlaßquerschnitt und einen Trichterhals (TH) mit einem entsprechend kleinen Aus­laßquerschnitt aufweist.3. Smoke detector according to claim 1 or 2,
characterized in that the funnel (T) has a funnel mouth (TM) with a relatively large inlet cross section and a funnel neck (TH) with a correspondingly small outlet cross section. 4. Rauchmelder nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, daß das Gitter (G) am Trichtermund (TM) angeordnet ist.4. Smoke detector according to claim 1, 2 or 3,
characterized in that the grid (G) is arranged on the funnel mouth (TM). 5. Rauchmelder nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet, daß das Gitter (g) am Trichterhals (TH) angeordnet ist.5. Smoke detector according to claim 1, 2 or 3,
characterized in that the grid (g) is arranged on the funnel neck (TH). 6. Rauchmelder nach Anspruch 1,2 oder 3,
dadurch gekennzeichnet, daß das Gitter zwischen Trichtermund (TM) und Trichterhals (TH) angeordnet ist.6. Smoke detector according to claim 1, 2 or 3,
characterized in that the grid is arranged between the funnel mouth (TM) and the funnel neck (TH).
EP87110952A 1986-07-31 1987-07-28 Smoke detector for early fire detection Withdrawn EP0255117A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3625968 1986-07-31
DE3625968 1986-07-31

Publications (1)

Publication Number Publication Date
EP0255117A1 true EP0255117A1 (en) 1988-02-03

Family

ID=6306419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110952A Withdrawn EP0255117A1 (en) 1986-07-31 1987-07-28 Smoke detector for early fire detection

Country Status (1)

Country Link
EP (1) EP0255117A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0717385A1 (en) * 1994-12-12 1996-06-19 Hockiki Corporation Light scattering smoke sensor
DE10153461A1 (en) * 2001-10-30 2003-05-15 Abb Patent Gmbh Smoke detector for interior ceiling mounting, has downwardly directed air guide surface which extends beyond side walls of detection chamber
EP2395489A2 (en) * 2010-06-09 2011-12-14 Dietmar F. Brück Smoke alarm device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2370278A1 (en) * 1976-11-04 1978-06-02 Solomon Elias OPTICAL SMOKE DETECTOR
DE2823582A1 (en) * 1978-05-30 1979-12-06 American District Telegraph Co Optical smoke detector inlet screen - consists of wire mesh extending between offset ports on outside and inside walls of dark chamber to bar insects

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2370278A1 (en) * 1976-11-04 1978-06-02 Solomon Elias OPTICAL SMOKE DETECTOR
DE2823582A1 (en) * 1978-05-30 1979-12-06 American District Telegraph Co Optical smoke detector inlet screen - consists of wire mesh extending between offset ports on outside and inside walls of dark chamber to bar insects

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0717385A1 (en) * 1994-12-12 1996-06-19 Hockiki Corporation Light scattering smoke sensor
DE10153461A1 (en) * 2001-10-30 2003-05-15 Abb Patent Gmbh Smoke detector for interior ceiling mounting, has downwardly directed air guide surface which extends beyond side walls of detection chamber
DE10153461B4 (en) * 2001-10-30 2004-01-29 Abb Patent Gmbh smoke detector
EP2395489A2 (en) * 2010-06-09 2011-12-14 Dietmar F. Brück Smoke alarm device
EP2395489A3 (en) * 2010-06-09 2012-01-11 Dietmar F. Brück Smoke alarm device

Similar Documents

Publication Publication Date Title
EP1232489B1 (en) Detector for scattered light
DE19781742B4 (en) Detection of pollutants in the air
DE2023953A1 (en) Smoke detector with at least one smoke measuring chamber
DE69415890T2 (en) Fire alarm device
DE4328671A1 (en) Light scatter smoke detector
EP0821330B1 (en) Smoke detector
DE69521279T2 (en) Scattered smoke sensor
DE2940520A1 (en) OPTICAL SMOKE DETECTOR
EP0040342B1 (en) Smoke detector
EP3671680A1 (en) Fire or smoke alarm
EP0255117A1 (en) Smoke detector for early fire detection
EP4150140B1 (en) Spinning facility with a protective device
DE8620624U1 (en) Smoke detectors for early fire detection
DE1507715C3 (en) Air separator
EP0298468A1 (en) System for monitoring the quality of a filter
DE3424135C2 (en)
DE202006021186U1 (en) Firefighting fan with an air flow rectifier
EP1440242B1 (en) Smoke protection for rooms
EP0257325A1 (en) Smoke detector for early fire detection
EP0130558B1 (en) Conventional size sample chamber for assembling an ionisation smoke alarm insert
WO1998003947A1 (en) Smoke alarm
DE10153461B4 (en) smoke detector
DE19647105C2 (en) Fire protection arrangement
EP0821332A1 (en) Smoke detector
DE2328888A1 (en) METHOD AND DEVICE FOR MEASURING THE DENSITY OF MIST

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

Kind code of ref document: A1

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

17P Request for examination filed

Effective date: 19880729

17Q First examination report despatched

Effective date: 19901219

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

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19910318

R18W Application withdrawn (corrected)

Effective date: 19910318

RIN1 Information on inventor provided before grant (corrected)

Inventor name: THILO, PEER, DR.-ING.

Inventor name: KAISER, KLAUS