EP0607402B1 - Form zum herstellen von flüssigkeitshaltigen pressteilen - Google Patents

Form zum herstellen von flüssigkeitshaltigen pressteilen Download PDF

Info

Publication number
EP0607402B1
EP0607402B1 EP93917716A EP93917716A EP0607402B1 EP 0607402 B1 EP0607402 B1 EP 0607402B1 EP 93917716 A EP93917716 A EP 93917716A EP 93917716 A EP93917716 A EP 93917716A EP 0607402 B1 EP0607402 B1 EP 0607402B1
Authority
EP
European Patent Office
Prior art keywords
layer
sintered
ceramic material
pore
foamed ceramic
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
EP93917716A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0607402A1 (de
Inventor
Willi Roth
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0607402A1 publication Critical patent/EP0607402A1/de
Application granted granted Critical
Publication of EP0607402B1 publication Critical patent/EP0607402B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
    • B28B7/368—Absorbent linings

Definitions

  • the invention relates to a mold for the production of liquid-containing pressed parts, such as roof tiles made of clay, a clay-like or similar material.
  • Roof tiles in the form of pressed roof tiles are usually made of clay, clay or similar material with a very specific water content; the clay or the clay-containing material is applied to a negative mold made of gypsum, which is accommodated in a steel frame and serves as the lower mold, and is finally pressed into a raw brick of the desired shape in a press by means of a negative mold made of gypsum which also serves as the upper mold .
  • a negative mold made of gypsum which also serves as the upper mold.
  • the top of the plaster mold serving as the lower mold is modeled on the surface of the underside of the bricks to be produced, while the downward-facing upper surface of the negative mold made of plaster serving as the upper mold corresponds to the visible outer surface of a brick.
  • porous mold for the pressure casting of ceramic shaped pieces with a porous inner layer and a coarse-porous outer layer covering the back of the porous inner layer.
  • the porous inner layer has an average pore diameter of at most 20 ⁇ m and a thickness of 5 to 40mm.
  • an adhesive is applied, on which a porous Is applied outer layer, which consists of liquid resin and a filler with a grain size of 0.1 to 5mm and a thickness of 5 to 30mm and a pore diameter of at least 100 microns.
  • This outer layer is sealed by a resin adhesive layer.
  • EP-A-0 121 929 discloses a permeable mold for forming three-dimensional moldings, the inner layer of which is made from a mixed slurry which contains metallic grains, ceramic grains and a liquid binder with an evaporating or consumable component. A support layer of unsintered metal and ceramic powder is applied to this layer sintered in an oxidizing atmosphere. Due to the evaporating or consumable component of the liquid binder in the inner layer, openings with a porosity of 5 to 60% are created in the mold.
  • the two known forms described above have in particular the disadvantage that they do not withstand the high contact pressure which is necessary when producing roof tiles in order to squeeze the liquid contained in the material to be pressed out of the clay, the clay-containing or similar material. Furthermore, the forms described above have the disadvantage that they have only a low resistance to abrasion.
  • the negative molds made of gypsum used as the upper and lower mold undergo considerable abrasion, so that after an approximately known, not too high number of pressings, the wear, in particular on the negative mold made of gypsum as the upper mold, is so great due to the abrasion that the specified tolerances, in particular with regard to the permissible minimum thickness of the finished brick, can no longer be met.
  • the plaster mold serving as the upper mold must therefore after about 600 to 800, at best 1000 brick pressings can be exchanged for a new, provided upper mold.
  • the press must be replaced with a new, unused gypsum mold after half an hour at the latest, this process on average 5 to max. Takes 10min. Replacing the plaster mold serving as the upper mold takes 1 to 1.5 hours with a ten-hour shift, so that the brick press stops 10 to 15% of the time per shift.
  • the old used gypsum molds are generally employed by three workers in each shift.
  • the object of the invention is therefore to provide a mold for the production of liquid-containing pressed parts, such as clay roof tiles, a clay-containing or similar material, which has a very high wear resistance and durability. According to the invention, this is achieved in a mold for the production of liquid-containing pressed parts, such as roof tiles made of clay, a clay-containing or similar material, by the features in the characterizing part of claim 1 or 15. Advantageous further developments are the subject of to claim 1 or 15 directly or indirectly subordinate claims.
  • a layer which comes into contact with the material to be pressed consists of fine-pored, sintered or foamed ceramic material, while the layer below is coarse-pored, sintered or foamed ceramic material or foamed concrete.
  • the fine-pored, sintered or foamed ceramic material has a porosity of the order of 10 ⁇ (10. 10 -10 m) to 30 ⁇ m and the proportion of porosity is between 5 and 60% depending on the material to be pressed.
  • additives such as corundum, mullite, silicon carbide, silicon nitride, zirconium dioxide and the like are added to the fine-pored, sintered or foamed ceramic material.
  • the fine-pored, sintered or foamed ceramic material consists of corundum, mullite, silicon carbide, silicon nitride or zirconium dioxide. Since zirconium dioxide is electrically conductive, if zirconium dioxide is added to the fine-pored, sintered or foamed ceramic material, demolding can be carried out more easily, or the adhesion between the mold and the pressed material is considerably reduced by the application of direct current.
  • the same effect can also be achieved in that the surface of the layer of fine-pored, sintered or foamed material has a metallized or an oxidation layer.
  • metal particles can be embedded in the fine-pored, sintered or foamed ceramic material to increase the conductivity.
  • the layer of foamed ceramic material preferably has a thickness on the order of 0.1 to 2.0 mm.
  • a Stainless steel mesh can be introduced.
  • such a fabric made of stainless steel is accommodated in an area corresponding to the sealing labyrinth of the finished brick in the form of strip-shaped or web-like projections running in the longitudinal direction of a brick, which protrude outwards from the layer of fine-pored ceramic material; this largely prevents the web-like or strip-like projections in the layer of fine-pored, sintered or foamed material from breaking off.
  • a mold according to the invention Because of the high abrasion resistance of fine-pored, sintered or foamed ceramic material, its wear during pressing is minimal compared to the abrasion with the plaster molds commonly used, so that a mold according to the invention has a service life of one depending on the material used for the production of roof tiles can have half to a year and more.
  • the daily downtimes of the press in the order of 1 hour to 1.5 hours, which were previously required for spraying out used plaster molds and for inserting new, provided plaster molds, are thus eliminated. This means that the personnel involved in the manufacture, provision and spraying of new gypsum molds are no longer required, and the entire cost of gypsum is also eliminated.
  • the layer consists of coarse-pored, sintered or foamed ceramic material, preferably of silicon carbide or corundum and, in order to enable backwashing with solvents or water, has a porosity that is 3 to 20 times greater than the porosity of the layer of fine-pored, sintered or foamed ceramic material.
  • the layer of the layer arranged below is preferably made in the region facing away from the layer of fine-pored, sintered or foamed ceramic material coarse-pored, sintered or foamed ceramic material or foamed concrete a number of tubular channels for draining the liquid in the form of water are formed.
  • cavities are formed in the layer of coarse-pore ceramic material or foamed concrete with supporting intermediate webs left between them.
  • the cavities in the layer of large-pore, sintered or foamed ceramic material preferably have a cross-sectional area of the order of magnitude of 100 mm 2 , while the supporting intermediate webs have a thickness of 4 to 5 mm.
  • the formation of the cavities in the layer of large-pore material saves a considerable amount of material, at the same time the distance and thus the time required for the liquid to be pressed out of the material to be processed in the form of water is reduced in order to keep the relatively thin layer thickness above the penetrate numerous cavities in the layer of coarse-pored, sintered or foamed ceramic material. Liquid entering the cavities can be sucked off through tubular channels running transversely thereto or, as was previously the case, by means of negative pressure.
  • a porous connecting layer can be provided between the layer of fine-pored, sintered or foamed ceramic material and the layer of coarse-pored, sintered or foamed ceramic material to increase the adhesion.
  • the mold according to the invention can also be used for slip casting or metal casting with and without vacuum application.
  • the layer that comes into contact with the material to be pressed is a metal plate that has a large number of the finest Holes are penetrated, a layer of large-pore, sintered or foamed ceramic material or foamed concrete is again provided under this plate.
  • the holes in the metal plate are flared to the underlying layer of coarse-pored, sintered or foamed ceramic material or foamed concrete, so that the water squeezed out of the clay reaches the underlying layer of foamed concrete or of coarse-pored, sintered or foamed ceramic material more quickly .
  • the holes that widen conically to form a layer of coarse-pored, sintered or foamed ceramic material or foamed concrete run approximately perpendicular to the surface of the metal plate. If necessary, the holes are arranged in a different distribution density and / or with different diameters in different areas according to a further advantageous development of the invention.
  • the conically widening holes are produced, for example, by means of laser or electron beam processes.
  • FIG. 1 A first exemplary embodiment of a mold 1 according to the invention is shown schematically and to scale in FIG.
  • An upper layer 10 in FIG. 1 consists of fine-pored, sintered or foamed ceramic material, while underneath another layer 11 of coarse-pored, sintered or foamed ceramic material or foamed concrete is provided.
  • tubular channels 110 are provided, via which the liquid is drained from the clay, clayey or similar material in the form of water during the production of pressed roof tiles.
  • Layer 10 preferably has a thickness of 1.5 mm. Furthermore, both layers 10 and 11 are preferably colored continuously, so that the appearance of the color of the underlying layer 11 alone is an indication that the layer 10 made of fine-pored, sintered or foamed ceramic material is used.
  • protrusions 100 are shown on the upper side of the layer 10 made of fine-pored, sintered or foamed ceramic material in section outwards (upwards in FIG. 2), which in a direction perpendicular to the plane of the drawing are strip-shaped or web-like projections running parallel to one another, which in the negative form correspond to the sealing labyrinth provided in the lateral region of each roof tile.
  • a steel mesh 20 made of preferably stainless steel is accommodated in the region of such projections 100 the sectional view of Figures 1 and 2 can only be seen as points.
  • the steel mesh 20 is expediently also provided in the entire layer of fine-pored, sintered or foamed ceramic material.
  • cavities 111 are formed in the layer 11 from coarse-pored, sintered or foamed ceramic material or from foamed concrete, between which supporting webs 112 have been left.
  • the cavities 111 have a cross-sectional area on the order of 100 mm 2 , while the supporting intermediate webs 112 have a thickness on the order of preferably 4 to 5 mm.
  • the provision of the cavities 111 in the layer 11 achieves considerable material savings and, at the same time, the liquid emerging from the layer 10 generally only has to penetrate a considerably thinner layer above the individual cavities in the form of water. The liquid which has escaped into the cavities can be drained from these, for example, through corresponding channels through the tubular channels 110 in FIG.
  • FIG. 3 shows a modification of a mold 1 'according to the invention.
  • a steel plate 30 is arranged over the layer 11 made of coarse-pored, sintered or foamed ceramic material or made of foamed concrete, which are penetrated by a large number of holes 300.
  • the holes 300 shown in section are flared to the layer 11 provided there, made of foamed concrete or of coarse-pored, sintered or foamed ceramic material.
  • the respective center axes are indicated by dash-dotted lines in the individual holes 300.
  • the conical holes 300 have a diameter of 10 ⁇ m to 400 ⁇ m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Moulds, Cores, Or Mandrels (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Producing Shaped Articles From Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Closures For Containers (AREA)
EP93917716A 1992-07-31 1993-07-30 Form zum herstellen von flüssigkeitshaltigen pressteilen Expired - Lifetime EP0607402B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4225412A DE4225412C1 (enrdf_load_stackoverflow) 1992-07-31 1992-07-31
DE4225412 1992-07-31
PCT/EP1993/002048 WO1994003313A1 (de) 1992-07-31 1993-07-30 Form zum herstellen von flüssigkeitshaltigen pressteilen

Publications (2)

Publication Number Publication Date
EP0607402A1 EP0607402A1 (de) 1994-07-27
EP0607402B1 true EP0607402B1 (de) 1997-11-12

Family

ID=6464613

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93917716A Expired - Lifetime EP0607402B1 (de) 1992-07-31 1993-07-30 Form zum herstellen von flüssigkeitshaltigen pressteilen

Country Status (9)

Country Link
EP (1) EP0607402B1 (enrdf_load_stackoverflow)
CN (1) CN1088150A (enrdf_load_stackoverflow)
AT (1) ATE160105T1 (enrdf_load_stackoverflow)
AU (1) AU666968B2 (enrdf_load_stackoverflow)
CA (1) CA2120157A1 (enrdf_load_stackoverflow)
DE (1) DE4225412C1 (enrdf_load_stackoverflow)
TR (1) TR28181A (enrdf_load_stackoverflow)
WO (1) WO1994003313A1 (enrdf_load_stackoverflow)
ZA (1) ZA935514B (enrdf_load_stackoverflow)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2132717T3 (es) * 1994-11-02 1999-08-16 Portec Ag Dispositivo de circulacion de un fluido entre un volumen delimitado por una superficie solida y un canal, y procedimiento de fabricacion de este dispositivo.
ATE353274T1 (de) * 1999-10-28 2007-02-15 Attenberger Keramik Verfahren zur herstellung von ziegeln oder fussbodenplatten aus ton
ITRE20010022A1 (it) * 2001-03-09 2002-09-09 Sacmi Elemento di stampo per la formatura d'oggetti mediante colatura ad impasto umido d'argilla e simili e metodo per la sua fabbricazione
DE102004056975B3 (de) * 2004-11-25 2006-07-06 Dorst Technologies Gmbh & Co. Kg Druckgussform und Verfahren zum Herstellen einer Druckgussform
DE102005007909A1 (de) * 2005-02-08 2006-08-10 Rennebeck, Klaus, Dr. Vorrichtung zur Herstellung von Formteilen aus Keramik
DE102007045806A1 (de) 2007-09-25 2009-04-02 Dorst Technologies Gmbh & Co. Kg Gießformkomponente und Verfahren zum Herstellen einer Gießformkomponente
DE102008008968A1 (de) 2008-02-13 2009-08-20 Schlickenrieder, Klaus, Dr. Ing. Form zum Herstellen von flüssigkeitshaltigen Teilen
DE102009007670A1 (de) 2009-02-05 2010-08-12 Dorst Technologies Gmbh & Co. Kg Gießformkomponente, Gießform und Verwendung einer solchen Gießform
DE102011106218B3 (de) 2011-06-07 2012-10-04 Etex Holding GmbH Tondachziegel-Nasspressform und Verfahren zur Herstellung einer Form für das Herstellen von Tondachziegeln durch Nasspressung
CN111361002A (zh) * 2020-03-10 2020-07-03 广西矿建集团有限公司 一种整体预制钢筋砼楼板的长方形钢模架及其构筑方法

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191406751A (en) * 1914-03-17 1915-03-17 Samuel Davidson Improvements in and relating to the Manufacture of Artificial Stone, Tiles and the like Moulded Ceramic and similar Products.
FR538169A (fr) * 1920-08-18 1922-06-06 Arthur Muller Bauten Und Indus Procédé et appareil pour l'exécution de plaques de moule pour la fabrication de tuiles en ciment dans des machines à plaques de frappe
GB283894A (en) * 1927-01-19 1929-07-16 William Joseph Miller Improvements in moulds for use in pottery manufacture
US1993047A (en) * 1933-02-14 1935-03-05 Ontario Research Foundation Process for the manufacture of ceramic ware
US2026940A (en) * 1934-12-13 1936-01-07 Harbison Walker Refractories Shaping refractory articles
FR52514E (fr) * 1942-07-24 1945-04-17 Procédé de traitement et de séchage de la tourbe
DE910154C (de) * 1951-01-10 1954-04-29 Gottfried Cremer Dr Pressform
US2809898A (en) * 1954-02-16 1957-10-15 Gen Electric Porous ceramic mold and method of making same
US2800072A (en) * 1954-04-28 1957-07-23 American Viscose Corp Cylindrical press assembly
US2984887A (en) * 1958-01-30 1961-05-23 Gen Electric Apparatus for manufacturing ceramics
DE2104080A1 (en) * 1971-01-29 1972-08-03 Metallgesellschaft Ag, 6000 Frankfurt Porous absorptive shapes contg silicon nitride - for refractory ceramic use
FR2196602A5 (en) * 1972-08-18 1974-03-15 Bonnetot Henri Pneumatically stripped moulds - with porous metallic lining giving long mould life
CA1266159A (en) * 1983-04-09 1990-02-27 Takeo Nakagawa Composite and durable forming model with permeability
JPS6096585A (ja) * 1983-10-28 1985-05-30 バブコツク日立株式会社 多層構造セラミツクス部材とその製造方法
JPS61220809A (ja) * 1985-03-27 1986-10-01 Munekata Kk 金型
JPS6321105A (ja) * 1986-07-15 1988-01-28 トヨタ自動車株式会社 ２層構造のセラミツクス成形用多孔質成形型の製造方法
JPS6331710A (ja) * 1986-07-26 1988-02-10 東陶機器株式会社 陶磁器加圧成形用多孔質型の製法
FR2602708B1 (fr) * 1986-08-05 1990-08-24 Elmetherm Sa Procede de fabrication de moules destines a la realisation de pieces en matiere ceramique
FR2602504B1 (fr) * 1986-08-07 1992-02-14 Desmarquest Ceramiques Tech Procede de fabrication de materiaux de nitrure de silicium a porosite ouverte et application a des moules poreux
JPH03290202A (ja) * 1990-04-06 1991-12-19 Kawasaki Steel Corp 湿式成形用型
FR2674172B1 (fr) * 1991-03-21 1993-06-18 Ind Regionale Batiment Moule de pressage pour la realisation d'articles obtenus a partir d'un materiau moulable sous forme de pate humide.

Also Published As

Publication number Publication date
EP0607402A1 (de) 1994-07-27
ATE160105T1 (de) 1997-11-15
CN1088150A (zh) 1994-06-22
AU666968B2 (en) 1996-02-29
CA2120157A1 (en) 1994-02-17
TR28181A (tr) 1996-02-06
DE4225412C1 (enrdf_load_stackoverflow) 1993-04-29
AU4705693A (en) 1994-03-03
WO1994003313A1 (de) 1994-02-17
ZA935514B (en) 1994-09-20

Similar Documents

Publication Publication Date Title
DE3724610C2 (enrdf_load_stackoverflow)
DE69516863T2 (de) Verfahren zum herstellen von pulver-vorformlingen und davon hergestellte schleifartikel
DE69435041T2 (de) Verfahren zur Herstellung eines Abrasivmaterials
EP0607402B1 (de) Form zum herstellen von flüssigkeitshaltigen pressteilen
DE3234076A1 (de) Verfahren zum formen poroeser, harzgebundener kohlenstoffasergegenstaende
DE69806793T2 (de) Verfahren zum herstellen von platten aus körnigen steinmaterialen und/oder sand mit einer härtbaren harzmischung und geformte folie zur durchführung des verfahrens
DE3735751C2 (enrdf_load_stackoverflow)
EP0234360A1 (de) Giessform zur Erstellung von Keramikkörpern
EP0319943A1 (de) Verfahren zur Herstellung von Formteilen
DE19652626C1 (de) Wärmedämmformkörper mit Umhüllung und Verfahren zu deren Herstellung
DE1925936A1 (de) Pressform zum Herstellen grobkeramischer Erzeugnisse und Verfahren zu ihrer Herstellung
DE102004018135B4 (de) Verfahren und Formvorrichtung zur Herstellung porosierter Schaumbeton-Formkörper
DE102017005219A1 (de) Poröse Keramikstruktur
DE2339531B2 (de) Von einem naturstein oder einem kunststein abgeformte matrize aus elastischem werkstoff zur herstellung von kunststeinen
DE102004056975B3 (de) Druckgussform und Verfahren zum Herstellen einer Druckgussform
DE2239055C2 (de) Verfahren zur Herstellung einer von einer Natursteinplatte abgeformten elastischen Matrize
DE19857187A1 (de) Abfallfreie oder abfallarme Herstellung von Formen zur spanlosen Herstellung von flüssigkeitshaltigen auszuformenden Teilen
DE2615537C2 (de) Verfahren zur Herstellung einer Schieberplatte für den Schieberverschluß an der Ausgußöffnung flüssige Schmelze enthaltender metallurgischer Behälter
DE69006875T2 (de) Flüssigkeitsdichte Schlickerguss-Formen und Verfahren zu deren Herstellung.
DE3503949C2 (enrdf_load_stackoverflow)
DE19637960C2 (de) Mehrschichtiger feuerfester Verschleißkörper
DE2132896C3 (de) Gießform für Rollrakelbetten aus elastomeren Werkstoffen
DE2429925A1 (de) Waermeisolierendes material und verfahren zu seiner herstellung
DE3923655A1 (de) Traeger zum brennen von keramik und verfahren zu deren herstellung
DE10347578A1 (de) Dachstein, der wenigstens zwei Lagen enthält

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 CH FR GB IT LI

17P Request for examination filed

Effective date: 19940812

17Q First examination report despatched

Effective date: 19960109

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT CH FR GB IT LI

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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;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.SCRIBED TIME-LIMIT

Effective date: 19971112

REF Corresponds to:

Ref document number: 160105

Country of ref document: AT

Date of ref document: 19971115

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

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

Effective date: 19980216

ET Fr: translation filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: RITSCHER & SEIFERT PATENTANWAELTE VSP

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

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980731

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
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: GB

Payment date: 19990712

Year of fee payment: 7

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

Ref country code: FR

Payment date: 20000718

Year of fee payment: 8

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

Ref country code: AT

Payment date: 20000721

Year of fee payment: 8

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

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000730

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

Effective date: 20000730

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

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010730

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

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020329

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST