EP0483191B1 - Vorrichtung und verfahren zum steuern und regeln der formfüllgeschwindigkeit und des giessdruckes einer niederdruckkokillengiessmaschine - Google Patents

Vorrichtung und verfahren zum steuern und regeln der formfüllgeschwindigkeit und des giessdruckes einer niederdruckkokillengiessmaschine Download PDF

Info

Publication number
EP0483191B1
EP0483191B1 EP90910641A EP90910641A EP0483191B1 EP 0483191 B1 EP0483191 B1 EP 0483191B1 EP 90910641 A EP90910641 A EP 90910641A EP 90910641 A EP90910641 A EP 90910641A EP 0483191 B1 EP0483191 B1 EP 0483191B1
Authority
EP
European Patent Office
Prior art keywords
pressure
probe
furnace chamber
chamber
casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90910641A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0483191A1 (de
Inventor
Georg Bilz
Hans Lämmermann
Alfred Dobner
Klaus Sterner
Klaus Riess
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.)
Novelis Deutschland GmbH
Original Assignee
Alcan Deutschland GmbH
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 Alcan Deutschland GmbH filed Critical Alcan Deutschland GmbH
Publication of EP0483191A1 publication Critical patent/EP0483191A1/de
Application granted granted Critical
Publication of EP0483191B1 publication Critical patent/EP0483191B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/08—Controlling, supervising, e.g. for safety reasons

Definitions

  • the invention relates to a device and a method for controlling and regulating the mold filling speed and the casting pressure of a low-pressure die casting machine, preferably for aluminum casting, whose hermetically lockable furnace space or container which holds the liquid casting material can be connected to the mold via a riser pipe leading to it which the casting material is pressed into the mold by means of gas pressure built up in the furnace chamber or container via a compressed gas supply line, with at least one contact probe in a height that can be changed in a probe chamber which projects into the furnace chamber or container from above and is open at its lower end for the entry of the casting material is arranged which gives a signal to a device for controlling the pressure gas inflow to the furnace chamber when contact is made with the casting material rising due to the gas pressure in the probe pressure.
  • Such a control device using at least one contact probe is already known (DE-AS 28 08 588).
  • a contact probe which can also be moved in its height position, is used to control and regulate the gas pressure in the furnace chamber over the entire casting cycle.
  • the contact probe has two scanning needles with probe tips at different heights.
  • the pressure gas flow to the furnace chamber or container of the casting material is regulated so that the level of the casting material is held in the probe chamber integrated in the riser pipe between the lower and the upper probe tip of the contact probe, the height of the probe corresponding to the desired gas pressure in the furnace chamber or Container is set.
  • This known device has the disadvantage that the probe tips of the contact probe are in contact with or immersed in the liquid casting material several times or even continuously during each casting process, as a result of which the contact probe rapidly due to adhesion of residues and oxides of the casting material or through dissolution by the casting material loses its functional accuracy.
  • the contact probe rapidly due to adhesion of residues and oxides of the casting material or through dissolution by the casting material loses its functional accuracy.
  • Devices for regulating the casting pressure in low-pressure die casting machines are also known (DE-AS 23 31 956), in which the gas pressure in the furnace space or in the container for the liquid casting material is set and controlled in a computer-controlled manner in accordance with a predetermined pressure / time curve.
  • the pressurized gas is supplied through two pressurized gas feed lines with different flow cross sections.
  • Several contact probes are provided, which are arranged immovably over the path of the rising height of the casting material and which partially or completely open and close the two compressed gas supply lines via complicated pneumatic control elements and thus ensure a gas pressure which can be regulated within wide limits in accordance with the control specifications. With each casting cycle, these contact probes are again immersed in the liquid casting material which is pushed up to or beyond them, so that they have the same disadvantage as the probe in the first known device.
  • the invention is therefore based on the object, in a device and in a method of the type mentioned, to maintain the functionality of the contact probe unchanged over a large number of casting cycles and thus to eliminate disturbances in the regulation of the casting pressure, and to regulate the compressed gas supply introduced by the probe structurally as simple and reliable as possible.
  • the contact probe upon contact with the casting material rising due to the gas pressure in the probe chamber in which it gives a signal to a device for regulating the pressure gas flow to the furnace chamber or container, in which it receives the probe chamber in such a higher position which is not reached during the casting process by the level of the casting material, and that a measuring device is provided for measuring the gas pressure given in the upper region of the furnace space or container for the casting material, which measures the measured gas pressure in the form of a signal to the device Control of the compressed gas flow passes.
  • the contact probe therefore only operates once during a casting cycle, and it indicates the contact entry to the device for controlling the pressure gas inflow, as a result of which the further control and regulation of the gas pressure in the furnace chamber or container over time after a predetermined time Program can be initiated.
  • the gas pressure measured at that moment by the measuring device in the furnace chamber or container can be used as a reference pressure for the further control process.
  • the gas pressure given in the furnace chamber or container can be continuously measured again with the provided pressure measuring device and the pressure gas inflow to the furnace chamber or container can be regulated in accordance with the respectively measured actual pressures and the target pressures specified by the control.
  • the contact probe can be set in such a high position in the probe space that its scanning tip lies approximately at the height of the outlet opening of the riser tube which can be connected to the mold. This height corresponds approximately to the level of the casting material shortly before the mold is filled, i.e. a level that is slightly below the mold cavity.
  • the probe chamber is expediently hermetically sealed, with the exception of its lower opening, for the entry of the casting material, so that a gas pressure can be built up above the casting material rising in this chamber, which prevents the casting material from rising up to the contact probe in its raised position with certainty.
  • the upper part of the probe chamber can be connected to the furnace chamber or to the compressed gas compensation line with a shut-off valve Connect the container for the liquid casting material.
  • This shut-off device can be a shuttle valve which can be controlled so that at the start of a casting cycle it first opens the upper probe chamber to the outside air (vent position) when the contact probe comes into contact with the casting material that is pushed up in the probe chamber, closes the vent opening and opens the pressure compensation line to the furnace chamber and thus establishes the gas pressure balance between the probe chamber and the furnace chamber.
  • the passage cross section of the compressed gas supply line can expediently be changed as a function of the gas pressure specified in the furnace chamber or container by the control program.
  • the compressed gas feed line is divided into a plurality of branch lines which are brought together again before they enter the furnace chamber or container and each have an unchangeable passage cross-section, preferably in the form of a fixed orifice, for the compressed gas and a shut-off valve.
  • the fixed orifices can have different through-openings and can be opened or closed individually or in any combination by the device for regulating the pressure gas inflow, as a result of which the pressure gas inflow required to the furnace or container, which is responsible for the rate of rise of the casting material in the riser pipe, can be precisely regulated.
  • This simple control and regulation is cheap, technically unproblematic and least susceptible to malfunction.
  • FIG. 1 of the drawing shows a particularly advantageous exemplary embodiment of the control device according to the invention in a low-pressure casting system for aluminum casting, which is described in more detail below.
  • FIG. 2 shows the gas pressure control possible in the course of a casting cycle with the device according to the invention in a pressure time diagram.
  • the casting plant shown in FIG. 1 consists of a metal melting furnace 1, into which a riser pipe 2 projects obliquely up to its bottom, which at its outer end has a connecting flange 3 for coupling to a connecting flange 4 with a casting opening and a mold 5 with a mold cavity 6 Is provided.
  • This contact probe consists of a contact plate 13 which is seated on a guide rod 14 actuated by the drive cylinder 12.
  • the height of the probe 13 with the guide rod 14 can be adjusted and changed in the probe chamber 10 by the drive cylinder 12.
  • the probe chamber 10 receiving the probe 13 is, with the exception of its lower inlet opening 8 for the casting material and the confluence with the furnace chamber 7 leading gas pressure compensation line 17 and a vent in the shuttle valve 18 hermetically sealed.
  • a compressed gas supply line 19 opens into the furnace chamber.
  • This compressed gas supply line is subdivided into six branch lines 20 to 25, which are brought together again before they open into the furnace chamber 7 and each have an open-close control valve 26.
  • the branch lines 20 to 24 are also provided with fixed orifices 27 to 31 which determine the passage of the gas volume and which have different passage cross sections.
  • the lines 20 to 25 provided with the fixed orifices can be opened individually or in any combination via their control valves 26, so that the volume of pressurized gas required for the required climbing speed in the riser pipe 2 can be introduced into the furnace chamber 7 via the pressurized gas supply line 19 .
  • the control valve 26 in the branch line 25 also serves, together with the throttle valve 32 also arranged in this branch line, for regulating the leakage compensation.
  • a vent line 33 with a vent valve 34 is connected to this line.
  • a gas pressure measuring line 35 which leads to a measuring device 36 designed as a pressure-current converter, which transmits the gas pressure registered by him via line 35 in the furnace chamber 7 via electrical signals to an electrical control unit 37, which is used for the control the valves 11, 18, 26 and 34 is set up.
  • the operation of the control device of this embodiment of the invention works as follows: First, the probe 13 is set at a height within the probe space 10, which corresponds approximately to the outlet opening of the riser pipe 2 in the area of its coupling flange 3.
  • the shuttle valve 18 is switched so that the upper probe chamber is vented.
  • corresponding adjustment of the control valves 26 in the branch lines 20 to 25 of the pressurized gas feed lines 19 introduces pressurized gas into the furnace chamber 7, until the metal melt in the probe chamber 10 builds up to the lower edge of the contact probe 13 due to the gas pressure thus built up in the furnace chamber has been pushed up.
  • the contact between the pressed metal melt and the contact probe 13 is registered by the latter and reported to the electrical control unit 37, which then initiates further control of the compressed gas flow via the line 19 into the furnace chamber according to a predetermined program.
  • the probe 13 is raised by the drive cylinder 12 within the probe space 10 to a height position in which it remains out of contact with the cast material pushed up in the probe space during the entire subsequent casting process and the shuttle valve 18 is switched over, so that the vent opening of the upper probe space is closed and the compressed gas compensation line 17 is opened, whereby the gas pressure in the furnace chamber 7 is transferred into the probe chamber 10 above the metal melt therein and the metal melt which has risen in this chamber is pressed back to the level of the melt in the furnace chamber 7.
  • the gas pressure given at this point in time in the furnace space 7 is measured by the measuring device and its measurement result is passed on electrically to the electrical control device 37, which is the height given at that moment of the gas pressure in the furnace chamber 7 is used as a reference variable for the further control of the casting pressure in the furnace chamber.
  • the numerals in the rectangles in FIG. 2 denote measuring points at which the pressure gas inflow and thus the further time course of the pressure rise in the furnace space undergoes a change in the course of a casting cycle.
  • the first section of the curve located between the measuring points 1 and 2 shows the increase in the gas pressure up to the point in time at which the metal melt has reached the contact probe 13 in the probe chamber 10 set at the level of the coupling flange 3 of the riser pipe 2 (level line A).
  • level line A level line A
  • This pressure build-up phase is followed by the phase of the beginning of the filling of the mold cavity 6 in the mold 5, which is characterized by the curve section between the measuring points 2 and 3 of the pressure-time curve according to FIG. 2.
  • the pressure increase per unit of time is somewhat less than in the previous pressure build-up phase.
  • phase of the main mold filling which is characterized by the curve section between the measuring points 3 and 4 in FIG. 2, followed by the phase of the end of the mold filling with an increased pressure increase according to the curve section given between the measuring points 4 and 5, until the mold cavity 6 is completely filled (level line B).
  • This phase is initially followed by a renewed increase in pressure, the holding pressure phase, which is characterized by the curve section between measuring points 5 and 6, and then the phase of the holding of this holding pressure, which is used for the make-up, which is characterized by the curve section between measuring points 6 and 7.
  • the gas pressure in the furnace chamber 7 is reduced to zero by opening the vent valve 34, which is shown in FIG. 2 by the curve section between the measuring points 7 and 8.
  • the still liquid metal from the sprue and riser pipe sinks back into the furnace.
  • control valves 26 are opened or closed in different combinations, as can be seen from the following example:
  • control valves remain in their set position in the individual phases of the casting cycle until the gas pressure in the furnace chamber 7, which is continuously measured by the measuring device 36, has reached the respective target pressure specified according to the control program.
  • control and leakage loss valve 26 located in the branch line 25 is used, which according to the leaks determined by gas pressure measurement in the entire gas pressure system continuously allows a certain amount of compressed gas to flow into the furnace interior 7. Observing the constancy of the gas pressure during the holding pressure phase can serve to register changes in the total leakage losses and to compensate for them by adjusting the loss compensation accordingly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Control Of Fluid Pressure (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP90910641A 1989-07-26 1990-07-25 Vorrichtung und verfahren zum steuern und regeln der formfüllgeschwindigkeit und des giessdruckes einer niederdruckkokillengiessmaschine Expired - Lifetime EP0483191B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3924775 1989-07-26
DE3924775A DE3924775C1 (enrdf_load_stackoverflow) 1989-07-26 1989-07-26

Publications (2)

Publication Number Publication Date
EP0483191A1 EP0483191A1 (de) 1992-05-06
EP0483191B1 true EP0483191B1 (de) 1993-05-26

Family

ID=6385907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90910641A Expired - Lifetime EP0483191B1 (de) 1989-07-26 1990-07-25 Vorrichtung und verfahren zum steuern und regeln der formfüllgeschwindigkeit und des giessdruckes einer niederdruckkokillengiessmaschine

Country Status (14)

Country Link
EP (1) EP0483191B1 (enrdf_load_stackoverflow)
JP (1) JPH04506934A (enrdf_load_stackoverflow)
KR (1) KR920700811A (enrdf_load_stackoverflow)
AT (1) ATE89773T1 (enrdf_load_stackoverflow)
AU (1) AU6043590A (enrdf_load_stackoverflow)
BR (1) BR9007556A (enrdf_load_stackoverflow)
CA (1) CA2053922A1 (enrdf_load_stackoverflow)
DD (1) DD295571A5 (enrdf_load_stackoverflow)
DE (2) DE3924775C1 (enrdf_load_stackoverflow)
DK (1) DK0483191T3 (enrdf_load_stackoverflow)
ES (1) ES2040600T3 (enrdf_load_stackoverflow)
MY (1) MY106433A (enrdf_load_stackoverflow)
PT (1) PT94821A (enrdf_load_stackoverflow)
WO (1) WO1991001833A1 (enrdf_load_stackoverflow)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT396439B (de) * 1991-05-13 1993-09-27 Sommerhuber Franz Vorrichtung für den kokillenguss grossdimensionaler profile, insbesondere hohlprofile, aus leichtmetall
FR2705044B1 (fr) * 1993-05-10 1995-08-04 Merrien Pierre Procede de coulee pilotee sous basse pression d'un moule sous vide pour alliages d'aluminium ou de magnesium et dispositif pour sa mise en oeuvre.
DE19821419A1 (de) 1998-05-13 1999-11-18 Georg Fischer Disa Ag Verfahren zum steigenden Niederdruck-Gießen von Metall, insbesondere Leichtmetall
DE19834553A1 (de) * 1998-07-31 2000-02-03 Georg Fischer Disa Ag Verfahren und Vorrichtung zum steigenden Gießen von Leichtmetall
DE19905874C2 (de) * 1999-02-12 2003-07-24 Vaw Alucast Gmbh Vorrichtung zum Befüllen von Gießformen
DE10061026A1 (de) * 2000-12-08 2002-06-13 Bayerische Motoren Werke Ag Metallgießverfahren und -vorrichtung
DE10352179B4 (de) * 2003-11-05 2007-09-06 Dihag Deutsche Giesserei- Und Industrie-Holding Ag Niederdruckgießverfahren zur Herstellung eines Gußteils
JP5073392B2 (ja) * 2007-07-11 2012-11-14 東京窯業株式会社 取鍋
CN102211170A (zh) * 2011-05-20 2011-10-12 江苏天宏机械工业有限公司 一种高增压型低压铸造机
US8327915B1 (en) * 2011-05-25 2012-12-11 GM Global Technology Operations LLC Pour ladle for molten metal
CN108620557A (zh) * 2018-05-25 2018-10-09 东莞市镁正隆工业熔炉设备有限公司 一种合金压铸给料精密计量设备及其工作方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4153100A (en) * 1975-10-27 1979-05-08 Institut Po Metaloznanie I Technologia Na Metalite Low-pressure or counterpressure casting apparatus
FR2382298A1 (fr) * 1977-03-01 1978-09-29 Renault Dispositif de coulee de metal liquide a basse pression
US4585050A (en) * 1981-01-05 1986-04-29 Etude Et Developpement En Metallurgie, E.D.E.M., S.A.R.L. Process for automatic regulation of a casting cycle

Also Published As

Publication number Publication date
PT94821A (pt) 1991-03-20
CA2053922A1 (en) 1991-01-27
MY106433A (en) 1995-05-30
BR9007556A (pt) 1992-06-23
AU6043590A (en) 1991-03-11
DE3924775C1 (enrdf_load_stackoverflow) 1990-03-29
WO1991001833A1 (de) 1991-02-21
DK0483191T3 (da) 1993-06-21
DD295571A5 (de) 1991-11-07
ATE89773T1 (de) 1993-06-15
DE59001574D1 (de) 1993-07-01
JPH04506934A (ja) 1992-12-03
KR920700811A (ko) 1992-08-10
ES2040600T3 (es) 1993-10-16
EP0483191A1 (de) 1992-05-06

Similar Documents

Publication Publication Date Title
EP0483191B1 (de) Vorrichtung und verfahren zum steuern und regeln der formfüllgeschwindigkeit und des giessdruckes einer niederdruckkokillengiessmaschine
DE2433060C2 (de) Verfahren zum Vergießen vorbestimmter Mengen schmelzflüssigen Metalls und Einrichtung zur Durchführung ' dieses Verfahrens
DE4239558A1 (de) Verfahren zur Unterdruck-Herstellung bei einer Druckgießmaschine
EP0324937A1 (de) Vorrichtung zum Beladen eines Trägergasstroms mit einem fliessfähigen Stoff und Verfahren zum Betrieb der Vorrichtung
EP2572588B1 (de) Vorrichtung und ein Verfahren zum Verteilen fliessfähiger oder - giessfähiger Massen, insbesondere von Luftschokolade
DE2851256C2 (enrdf_load_stackoverflow)
EP0594679B1 (de) Verfahren zur herstellung von gussstücken mittels einer druckgiessmaschine
DE3020076C2 (de) Regelvorrichtung für eine automatische Gießanlage
DE3233817A1 (de) Vorrichtung zum zufuehren von fluessigem metall zu einer giessmaschine
EP1080809B1 (de) Verfahren zur Regelung der Metalldosiermenge
DE10151423A1 (de) Vorrichtung zur Einstellung eines einen Bogentransport beeinflussenden Luftstroms in einer Druckmaschine und entsprechendes Verfahren
DE4419848C1 (de) Warmkammer-Druckgießmaschine
DE2616430A1 (de) Verfahren und vorrichtung zum austreiben von schuettgut aus einem innendruckbelastbaren silobehaelter
DE2808588A1 (de) Vorrichtung zum giessen von fluessigem metall unter niedrigem druck
DE69101052T2 (de) Verfahren zum Abfüllen nicht mischbarer Flüssigkeiten in Fässer und dessen Anwendungen, insbesondere für die Abfüllung von weissem Phosphor.
DE2431892A1 (de) Vorrichtung zur dosierten abgabe von fluessigem metall
DE2533070C3 (de) Verfahren zur dosierten Abgabe von Schüttgut
DE19855377A1 (de) Verfahren und Vorrichtung zur Befüllung von Gebinden
CH646624A5 (en) Process for casting molten metal under the pressure of a protective gas and apparatus for carrying out the process
DE3624392C2 (enrdf_load_stackoverflow)
DE3941538A1 (de) Verfahren und vorrichtung zur herstellung von hohlraeume aufweisenden gussstuecken
DE1508955C2 (de) Verfahren und Einrichtung zur selbsttätigen elektrischen und stetigen Regelung der Füllstandshöhe in StranggieBkokillen mit Hilfe der Stopfenstellung in einem vorgeschalteten Zwischenbehälter
DE865792C (de) Pressofen fuer zahntechnische Zwecke
DE19823134C1 (de) Verfahren und Vorrichtung zur Herstellung von Formteilen für Gießereizwecke aus Sand
EP1057558A1 (de) Verhinderung der Oxidation der Schmelze bei einer nach einem Vakuumverfahren arbeitenden Druckgiessmaschine

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

17P Request for examination filed

Effective date: 19910821

AK Designated contracting states

Kind code of ref document: A1

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

17Q First examination report despatched

Effective date: 19920924

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 DK ES FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 89773

Country of ref document: AT

Date of ref document: 19930615

Kind code of ref document: T

ITF It: translation for a ep patent filed
REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

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

Effective date: 19930601

REF Corresponds to:

Ref document number: 59001574

Country of ref document: DE

Date of ref document: 19930701

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

Ref country code: SE

Payment date: 19930719

Year of fee payment: 4

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

Ref country code: LI

Effective date: 19930731

Ref country code: CH

Effective date: 19930731

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

Ref country code: NL

Payment date: 19930731

Year of fee payment: 4

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19930812

Year of fee payment: 4

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

Ref country code: AT

Payment date: 19930817

Year of fee payment: 4

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

Ref country code: DK

Payment date: 19930930

Year of fee payment: 4

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2040600

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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: GB

Payment date: 19940719

Year of fee payment: 5

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

Ref country code: ES

Payment date: 19940721

Year of fee payment: 5

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

Ref country code: DK

Effective date: 19940725

Ref country code: AT

Effective date: 19940725

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

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

Ref country code: SE

Effective date: 19940726

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

Ref country code: FR

Payment date: 19940728

Year of fee payment: 5

Ref country code: DE

Payment date: 19940728

Year of fee payment: 5

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

Ref country code: BE

Effective date: 19940731

BERE Be: lapsed

Owner name: ALCAN DEUTSCHLAND G.M.B.H.

Effective date: 19940731

EUG Se: european patent has lapsed

Ref document number: 90910641.1

Effective date: 19950210

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

Ref country code: NL

Effective date: 19950201

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
EUG Se: european patent has lapsed

Ref document number: 90910641.1

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

Ref country code: GB

Effective date: 19950725

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

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 19950726

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

Effective date: 19950725

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

Ref country code: DE

Effective date: 19960402

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

Ref country code: FR

Effective date: 19960430

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 19990601

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

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050725