EP0031559B1 - Appareil pour le chauffage de sable, gravier ou produits granuleux similaires - Google Patents

Appareil pour le chauffage de sable, gravier ou produits granuleux similaires Download PDF

Info

Publication number
EP0031559B1
EP0031559B1 EP80108049A EP80108049A EP0031559B1 EP 0031559 B1 EP0031559 B1 EP 0031559B1 EP 80108049 A EP80108049 A EP 80108049A EP 80108049 A EP80108049 A EP 80108049A EP 0031559 B1 EP0031559 B1 EP 0031559B1
Authority
EP
European Patent Office
Prior art keywords
gas
heating
batteries
channels
arcuately
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
EP80108049A
Other languages
German (de)
English (en)
Other versions
EP0031559A3 (en
EP0031559A2 (fr
Inventor
Kai Juhani Lainio
Antti Juhani Koivupalo
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.)
Partek Oy AB
Original Assignee
Partek Oy AB
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 Partek Oy AB filed Critical Partek Oy AB
Priority to AT80108049T priority Critical patent/ATE7671T1/de
Publication of EP0031559A2 publication Critical patent/EP0031559A2/fr
Publication of EP0031559A3 publication Critical patent/EP0031559A3/de
Application granted granted Critical
Publication of EP0031559B1 publication Critical patent/EP0031559B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/10—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material
    • F28C3/12—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid
    • F28C3/14—Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid the particulate material moving by gravity, e.g. down a tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/0007—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust
    • B28C7/0023—Pretreatment of the ingredients, e.g. by heating, sorting, grading, drying, disintegrating; Preventing generation of dust by heating or cooling
    • B28C7/003—Heating, e.g. using steam

Definitions

  • This invention relates to a device for heating sand, gravel or similar granular material, which comprises arched profile channels arranged in a silo for the material to be heated, for introducing the heating gas into the material and for discharging it therefrom.
  • a device for heating concrete aggregates is already known, in which a warm air blower is connected to the lower part of the silo and in the silo vault channels, which have the shape of an inverted V in cross section, are arranged one above the other, via which the air is introduced into the silo, and either run crosswise or parallel to each other, in the former case lying directly on top of each other (DE-A-2 355 253), while in the latter case short spacers are arranged between them.
  • the parallel vaulted troughs are arranged so that their ends in the middle of the silo form a zigzag line, while with the crossed vaulted troughs every second ends near an intersection.
  • Grain dryers are also known in which the vaulted profile channels with a V cross-section are arranged in such a manner that they overlap in such a way that every second channel is connected to the supply air duct and every second channel is connected to the exhaust air duct (DE-A-1 948 099).
  • every second channel is connected to the supply air duct and every second channel is connected to the exhaust air duct (DE-A-1 948 099).
  • the present invention is therefore based on the object to provide a device for heating sand, gravel or similar granular material device of the aforementioned type, in which the heating extends only to a precisely limited spatial area, even if it is in a storage or Intermediate silo takes place, the volume of which considerably exceeds the required heating space, so that the heating takes place so intensively that it may be in a continuous process, ie can be done continuously.
  • the device according to the invention is characterized in that both the vaulted profile channels serving for supplying the heating gas and the vaulted profile channels serving for discharging the heating gas are combined to form alternately arranged batteries which comprise several vaulted profile channels located one above the other and form vertical partition walls, between which there are relatively thin layers of the to warming goods.
  • the heating can take place by blowing heating gas, for example hot air or flue gas, through the layers within such a period of time that the desired average temperature of the layer is reached before the temperature of the layer on the heating gas discharge side is significantly higher their initial value has risen.
  • heating gas for example hot air or flue gas
  • the flow of the material to be heated is designed such that no mixing takes place, and the flow of the heating gas is such that the end face is very large over the entire flow length and the flow path is short. Because of this and because of the small heating zone volume, the device works at high speed, and the need for thermal insulation between the environment and the heating system is completely insignificant, not least because the heating zone is more or less completely in the middle of the material to be heated, depending on the size of the silo.
  • each vaulted profile gutter battery used for introducing heating gas is connected to a heating gas distribution chamber, which in turn is connected to the heating gas supply line.
  • the vault profile channel batteries used to discharge the heating gas one end is either connected to a collecting chamber, which in turn opens into the discharge duct, or the individual vault profile channel battery is connected to its own fume cupboard, which in turn is in its own, with the Throttle valve provided for regulating the heating gas flow opens the discharge shaft.
  • the vault profile channel batteries are arranged loosely on stationary guide pairs, which lead from the distribution chamber to the vault profile channel batteries used for introducing heating gas and from the vault profile channel batteries serving to discharge the heating gas to the collection chamber or to have openings leading to the discharge channels.
  • the arch profile channel batteries are preferably formed by two or more arch profile cassettes located one above the other, which in turn consist of several arch profile channels located one above the other. In this way, these parts exposed to wear and tear cannot be replaced. All you have to do is lift out the worn cassette and insert a new one.
  • each of the vault profile trough batteries used for introducing heating gas can be provided with its own throttle valve for regulating the gas flow, or between the vault profile channel batteries, limiting plates can be used to reduce the heating gas flow in the areas of the material layers in which the flow of the material to be heated is restricted or prevented, are used and / or obstacles which slow down the flow of material can be arranged between the arch profile channel batteries and serve to compensate for the flow rate of the material to be heated in the individual material layers.
  • the heating device according to the invention shown in FIGS. 1 to 3 comprises a plurality of batteries 2, 3 of arched channels arranged in the aggregate silo 1 or in a corresponding container, which are inserted at short intervals parallel to one another between guide pairs 4, by means of which they are supported at both ends .
  • Vertical layers 5 of the aggregate to be heated are formed between the arch profile channel batteries 2, 3, which can flow freely downward inside the cone 15 (FIG. 8) to the removal hatch 6 of the silo.
  • the guides 4 are fastened on one side of the arch profile channel batteries 2, 3 to a heating medium distribution chamber 7 which has an inlet opening 8 in every second arch profile channel battery 2.
  • a supply pipe 14 connected to the heating gas source is connected to the distribution chamber 7, via which the heating gas is passed to the distribution chamber 7 and from there via the arch profile channel batteries 2 into the additive to be heated.
  • the guides 4 are fastened to the discharge channels 11, each of which has a discharge opening 10 in the case of the arch profile channel batteries 3 which are not connected to the distribution chamber 7 via inlet openings 8.
  • the heating gas for example hot air or a flue gas-air mixture, is introduced into the additive layers 5 via the pipe 14 and the distribution chamber 7 and also via the vault profile channel batteries 2 connected to it.
  • the heating gas flows through the aggregate layers 5 into the vault profile channel batteries 3 connected to the extraction channels 11 and via these into the extraction channels 11.
  • the extraction channels are each connected to their own extraction duct 12, and each of these extraction ducts 12 is equipped with one Flow control valve 13 provided. With these control flaps 13, when using a continuously operating heating device, the heating gas flow through the individual material layers 5 can be regulated in such a way that it corresponds to the average flow rate of the aggregate in the individual aggregate layers 5.
  • the aggregate is heated in batches and especially in a special container that is smaller than the actual silo and corresponds to the volume of the aggregate batch to be heated, the control flaps 13 are unnecessary, since the aggregate is then in the rooms 5 all the time remains between the arch profile channel batteries 2, 3.
  • FIGS. 4 and 5 show the curved profile cassettes used in the heating device according to the invention on a larger scale.
  • a cassette consists of arched troughs 22 which are arranged at suitable intervals and are attached to vertical brackets 21 and which have the shape of an upside down V in cross section.
  • the arch profile channels can be fastened to the brackets 21, for example by welding.
  • the individual cassette comprises four arch profile channels 22 arranged one above the other, and in the embodiment shown in FIGS. 1 and 2, the individual battery profile channel battery 2, 3 comprises three arch profile cassettes arranged one above the other.
  • the heating gas distribution chamber 7 is shown, which is supported on the silo structure 1 in a suitable manner, not shown.
  • U-shaped guides 4 for the arch profile channel batteries 2, 3 are fastened to the distributor chamber 7. At every second guide 4 there is the opening 8, through which the heating gas can flow under the arched channels 22 of the battery channel 2.
  • the guides 4 for the arch profile channel batteries 2, 3 are fastened at corresponding locations, and in the trigger channel wall there is an opening 10 in a corresponding manner with every second guide 4, but with the openings 10 are offset from the injection duct openings 8.
  • the heating gas is passed via the pipe 14 into the distribution chamber 7, from where it flows through the openings 8 under the arched channels of the curved channel batteries 2.
  • the cavities form under the arched profile channels 9, in which the heating medium flows almost unhindered over the entire length of the arch profile channels and thus spread over the aggregate layer 5 with a large end face and likewise flow through this with a large end face and reach the arch profile channel batteries 3 and continue through their cavities 9 the openings 10 can flow into the discharge channels 11.
  • the heating device according to the invention can be used either as a continuous or as a batch device.
  • continuous operation the heater is placed inside the silo near the floor. With each removal, the amount of heat required to heat the amount of material to be removed from the silo in batches is blown into the heating device each time it is removed.
  • batch operation on the other hand, the net capacity of the heating container corresponds to the maximum batch.
  • Such an uneven flow of the goods can be prevented, for example, by applying motor vibrators 19 which are wear-resistant and encapsulated to the uppermost arch profile cassettes of the edge-side arch channel batteries, which promote the uniform flow of the material to be heated.
  • bars 17 can be arranged in the manner shown in FIG. 9 on the uppermost cassettes or below the lowermost cassettes in the areas of the fastest flow, which can be easily moved to the correct position experimentally.
  • the rails 17 are preferably arranged freely on pins 18 located on the uppermost arch profile cassettes in relatively close succession.
  • the heating gas flow can be limited in the manner shown in FIGS. 8 and 9 by limiting plates 16, the task of which is, depending on whether the point in question is a passive supply of the material to be heated that remains completely in place or only below average weak material flow is, the flow of heating gas through the layer 5 either over the entire length, ie to prevent the entire height of the arch profile channel batteries 2, 3 or only over part of this length.
  • the reference numeral 20 denotes the passive supply remaining between the silo wall and the heating device according to the invention, which remains at the point and which acts as a thermal insulation layer between the heating device and the surroundings.
  • the heating device according to the invention is operated with sufficiently hot heating gas.
  • the heating gas can have a temperature of 200 to 500 ° C, whereby the heating up time and thus the start-up time of the cold heating system is only a few minutes.
  • the heating gas can be circulated in the heating device according to the invention either in the form of a closed or an open system.
  • the gases from the discharge shaft 12 are again fed to the heat source and then fed into the pipe 14. If the flue gases of the heat source are mixed with the heating gas, only a quantity of gas corresponding to the quantity of flue gas has to be removed from the closed circuit.
  • the heating gases in their entirety are conducted out of the exhaust duct.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Road Paving Structures (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)
  • Secondary Cells (AREA)
  • Processing Of Solid Wastes (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Baking, Grill, Roasting (AREA)
  • Furnace Details (AREA)

Claims (10)

1. Appareil pour le chauffage de sable, gravier ou produits granuleux similaires, qui comprend des éléments de conduit (22) à profil en voûte pour l'introduction d'un gaz chauffant dans le produit et des éléments de conduit (22) à profil en voûte pour évacuer le gaz chauffant du produit,ces éléments étant disposés dans un récipient pour le produit à chauffer, caractérisé en ce qu'aussi bien les éléments de conduit à profil en voûte (22) prévus pour l'introduction du gaz chauffant que les éléments de conduit à profil en voûte (22) prévus pour l'évacuation du gaz chauffant sont assemblés sous forme de batteries (2, 3) formant des parois de séparation verticales, comprenant plusieurs éléments de conduit à profil en voûte superposés et devant être disposés alternativement les uns à côté des autres, et en ce qu'entre ces batteries sont disposés des couches minces (5) du produit à chauffer.
2. Appareil suivant la revendication 1, caractérisé en ce que l'une des extrémités de chaque batterie (2) d'éléments de conduit à profil en voûte servant à l'introduction du gaz chauffant est connectée à la chambre (7) de distribution du gaz chauffant, cette chambre étant connectée à son tour à la canalisation (14) d'alimentation en gaz chauffant.
3. Appareil suivant la revendication 1 ou 2, caractérisé en ce que l'une des extrémités de chaque batterie (3) d'éléments de conduit à profil en voûte servant à l'évacuation du gaz chauffant, est connectée à un collecteur qui est relié à son tour à une cheminée d'évacuation.
4 Appareil suivant la revendication 1 ou 2, caractérisé en ce que l'une des extrémités de chaque batterie (3) d'éléments de conduit à profil en voûte servant à l'évacuation du gaz chauffant est connectée à un canal d'évacuation (11) qui lui est propre, ce canal étant relié à son tour à une cheminée d'évacuation (12) qui lui est également propre, cette cheminée étant pourvue d'un registre (13) pour le réglage de l'écoulement du gaz chauffant.
5. Appareil suivant l'une quelconque des revendications précédentes, caractérisé en ce que les batteries (2,3) d'éléments de conduit à profil en voûte sous assemblées de façon lâche à des rails de guidage fixes (4) qui présentent des ouvertures (8) faisant communiquer la chambre de distribution (7) avec les batteries (2) d'éléments de conduit à profil en voûte servant à l'introduction du gaz chauffant et des ouvertures (10) faisant communiquer les batteries (3) d'éléments de conduit à profil en voûte servant à l'évacuation du gaz chauffant avec le collecteur ou les canaux d'évacuation (11).
6. Appareil suivant la revendication 5, caractérisé en ce que chaque batterie (2,3) d'éléments de profil en voûte est formée d'au moins deux unités superposées dont chacune est formée à son tour de plusieurs éléments de conduit à profil en voûte superposés.
7. Appareil suivant l'une quelconque des revendications 2 à 6, caractérisé en ce que chaque batterie (2) d'éléments de conduit à profil en voûte servant à l'introduction du gaz chauffant est munie de son propre registre de réglage de l'écoulement du gaz chauffant.
8. Appareil suivant l'une quelconque des revendications précédentes, caractérisé par des tôles (16) de limitation du débit du gaz chauffant, disposées entre les batteries (2,3) d'éléments de conduit à profil en voûte, pour permettre une réduction de ce débit dans les zones des couches de matière (5) dans lesquelles il n'y a pas ou presque pas d'écoulement de matière.
9. Appareil suivant l'une quelconque des revendications précédentes, caractérisé par des obstacles (17) freinant l'écoulement de la matière et disposés entre les batteries (2,3) d'éléments de conduit à profil en voûte ces obstacles étant destinés à égaliser la vitesse d'écoulement du produit à chauffer dans les diverses couches (5).
10 Appareil suivant l'une quelconque des revendications précédentes, caractérisé en ce qu'à l'exception de la canalisation d'entrée de gaz chauffant (14) et la cheminée ou les cheminées (12) d'évacuation du gaz chauffant,il est placé dans le récipient (4) du produit à chauffer de telle manière qu'entre la périphérie du récipient (1) et l'appareil de chauffage séjourne une couche de produit (20) immobile servant de couche d'isolation thermique.
EP80108049A 1979-12-28 1980-12-19 Appareil pour le chauffage de sable, gravier ou produits granuleux similaires Expired EP0031559B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80108049T ATE7671T1 (de) 1979-12-28 1980-12-19 Vorrichtung zum anwaermen von sand, kies oder aehnlichem koernigem gut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI794084A FI58758B (fi) 1979-12-28 1979-12-28 Anordning foer uppvaermning av sand grus eller liknande kornformigt material
FI794084 1979-12-28

Publications (3)

Publication Number Publication Date
EP0031559A2 EP0031559A2 (fr) 1981-07-08
EP0031559A3 EP0031559A3 (en) 1982-01-13
EP0031559B1 true EP0031559B1 (fr) 1984-05-30

Family

ID=8513160

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80108049A Expired EP0031559B1 (fr) 1979-12-28 1980-12-19 Appareil pour le chauffage de sable, gravier ou produits granuleux similaires

Country Status (5)

Country Link
EP (1) EP0031559B1 (fr)
AT (1) ATE7671T1 (fr)
DE (1) DE3068080D1 (fr)
DK (1) DK553480A (fr)
FI (1) FI58758B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2570639B1 (fr) * 1984-09-24 1988-07-15 Tuyaux Bonna Procedes et dispositifs pour accelerer la prise du beton
US6424153B1 (en) * 1999-11-23 2002-07-23 Koninklijke Philips Electronics, N.V. On-the-fly removal of data inconsistency with k-space oversampling and demodulation in MRI acquisitions
FR2900592A1 (fr) * 2006-05-04 2007-11-09 Christian Naas Vehicule de preparation et de malaxage de chape fluide
CN116750359B (zh) * 2023-08-21 2023-11-10 山东淼珠生物科技有限公司 一种爆珠生产用储料装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202524A (en) * 1922-09-01 1923-08-23 Simon Ltd Henry Improvements in drying and conditioning machines for cereals
DE1032698B (de) * 1953-06-30 1958-06-19 Svenska Flaektfabriken Ab Schachttrockner fuer rieselfaehiges Gut
SE319128B (fr) * 1968-09-24 1969-12-22 Svenska Flaektfabriken Ab
SE367567B (fr) * 1969-02-26 1974-06-04 Vaeaenaenen Olavi
FR2346964A1 (fr) * 1976-04-05 1977-11-04 Baudot Hubert Sechoir a grains

Also Published As

Publication number Publication date
FI58758B (fi) 1980-12-31
DE3068080D1 (en) 1984-07-05
DK553480A (da) 1981-06-29
ATE7671T1 (de) 1984-06-15
EP0031559A3 (en) 1982-01-13
EP0031559A2 (fr) 1981-07-08

Similar Documents

Publication Publication Date Title
DE3912751C1 (fr)
EP0574675B1 (fr) Installation de réacteur à lit mouvant
DE3877007T2 (de) Verfahren zur trocknen von fein verteilten guetern, insbesondere getreide und geraete zur durchfuehrung dieses verfahrens.
DD153819A5 (de) Verfahren zur aeroben verrottung und/oder trocknung von organischen abfallstoffen in einem verrottungsbunker sowie eine vorrichtung zu dessen ausuebung
DE2744449C2 (de) Vorrichtung zur Steuerung der Strömung von körnigem Gut durch einen Trocknungsturm
EP0031559B1 (fr) Appareil pour le chauffage de sable, gravier ou produits granuleux similaires
EP0064257B1 (fr) Installation de putréfaction
EP0174970B1 (fr) Amenagements de puits pour des procedes de transferts de matiere et/ou thermiques entre un gaz et un materiau en vrac
DE2855492A1 (de) Verfahren und trockner zum kontinuierlichen trocknen von getreide o.ae. rieselfaehigen gut
DE3912012C2 (de) Trockner für eine Asphaltfabrik
DE3029398C2 (de) Verfahren zur Trocknung und Vorerhitzung von feuchten Feingütern und Vorrichtung zur Durchführung des Verfahrens
EP0592368B1 (fr) Installation de compostage
DE1608023B1 (de) Ofen mit bewegtem Einsatz zur thermischen Behandlung von grobkoernigem Gut
WO1985004467A1 (fr) Procede de traitement thermique et/ou chimique d'un materiau granuleux, granule ou en morceaux
DE29508283U1 (de) Durchlauftrockner
DE19910687C2 (de) Vorrichtung zur Reinigung verunreinigter Abgase aus industriellen Prozessen, insbesondere thermische Nachverbrennungsvorrichtung
EP2395306A2 (fr) Procédé et dispositif de séchage de fibres, notamment de copeaux de bois
AT236890B (de) Vorrichtung zur kombinierten Schwerkraftmälzung
DE19852043C2 (de) Verfahren zum Trocknen und Trockner zur Durchführung des Verfahrens
DE17C (de) Mechanische Malzdarre. Maschinenfabrik Germania vorm
DE598012C (de) Vorrichtung zur Fuehrung von Gasen in bewegten, vorzugsweise umlaufenden Behaeltern, Trommeln, Drehrohroefen o. dgl.
DE1558608C2 (de) Austragsvorrichtung für einen Schachtofen, insbesondere zum Brennen von Kalk
DE897400C (de) Schweleinrichtung
DE1171326B (de) Vorrichtung zur Herstellung von Gips
DE2331311A1 (de) Trockner fuer granulate, insbesondere fuer getreide

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 DE NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

17P Request for examination filed

Effective date: 19811022

AK Designated contracting states

Designated state(s): AT DE NL SE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT DE NL SE

REF Corresponds to:

Ref document number: 7671

Country of ref document: AT

Date of ref document: 19840615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3068080

Country of ref document: DE

Date of ref document: 19840705

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

Ref country code: DE

Payment date: 19841210

Year of fee payment: 5

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

Ref country code: SE

Payment date: 19841231

Year of fee payment: 5

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: AT

Payment date: 19861215

Year of fee payment: 7

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

Ref country code: NL

Payment date: 19861231

Year of fee payment: 7

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

Ref country code: AT

Effective date: 19871219

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

Ref country code: SE

Effective date: 19871220

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

Ref country code: NL

Effective date: 19880701

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19880901

EUG Se: european patent has lapsed

Ref document number: 80108049.0

Effective date: 19880912