EP0857244B1 - Panels - Google Patents

Panels Download PDF

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Publication number
EP0857244B1
EP0857244B1 EP96935072A EP96935072A EP0857244B1 EP 0857244 B1 EP0857244 B1 EP 0857244B1 EP 96935072 A EP96935072 A EP 96935072A EP 96935072 A EP96935072 A EP 96935072A EP 0857244 B1 EP0857244 B1 EP 0857244B1
Authority
EP
European Patent Office
Prior art keywords
panel
open cell
cell structure
facing
sheets
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
EP96935072A
Other languages
German (de)
French (fr)
Other versions
EP0857244A1 (en
Inventor
Ian Philip Wood
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.)
Corus UK Ltd
Original Assignee
HH Robertson UK Ltd
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
Priority claimed from GBGB9521713.9A external-priority patent/GB9521713D0/en
Priority claimed from GBGB9525470.2A external-priority patent/GB9525470D0/en
Application filed by HH Robertson UK Ltd filed Critical HH Robertson UK Ltd
Priority to EP99122668A priority Critical patent/EP0980937A3/en
Publication of EP0857244A1 publication Critical patent/EP0857244A1/en
Application granted granted Critical
Publication of EP0857244B1 publication Critical patent/EP0857244B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E04C2/292—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating composed of insulating material and sheet metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/34—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts
    • E04C2/36—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels
    • E04C2/365—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure composed of two or more spaced sheet-like parts spaced apart by transversely-placed strip material, e.g. honeycomb panels by honeycomb structures

Definitions

  • This invention concerns panels, especially building panels for use in constructing walls and roofs.
  • Building panels which comprise metal facing sheets and a core of polyurethane foam. Whilst having good insulation properties, these panels do have some disadvantages.
  • One disadvantage is that they have a limit on their load bearing capacity even when made relatively thick because polyurethane foam is not particularly strong.
  • Another disadvantage arises simply from the use of polyurethane foam which gives off toxic fumes in fire situations. Increasingly, therefore, there is a movement away from using such wall panels.
  • a known building panel is disclosed in US-A-2744042.
  • the disclosed panel is a laminate in which a foamed resin is disposed within the interstices of a honeycomb structure in order to secure minimum density and still return relatively good strength, and impact resistance.
  • An object of this invention is to provide panels which do not suffer from, or at least alleviate, the disadvantages referred to above.
  • a panel comprising a pair of facing sheets and a core which comprises an open cell structure having walls extending between the facing sheets and a foam filling, the panel being characterised in that at least one facing sheet is profiled in the form of longitudinal channels which protrude from the outer face of the said at least one facing panel and are filled with the foam filling with the open cell structure not extending into the channels.
  • the facing sheets may be of metal, especially of steel, more especially of galvanised steel.
  • the outer faces of the or each facing sheet are covered or coated with a corrosion protection layer.
  • the channels are trapezoidal in section having a narrower base than open side.
  • the profile channels provide passages for escape of fumes from the foam unhindered by the open cell structure. The fumes can, therefore, be directed upwards out of top edges of panels and away from the interior of the building.
  • the facing sheets may alternatively be made of non-metallic materials and as such are preferably rigid boards.
  • suitable rigid boards for use in the invention include particle boards, cement particle boards, glass fibre reinforced cement boards, cellulose reinforced gypsum boards, crushed slate boards and resin boards.
  • Wooden facing sheets or composite wooden facing sheets may also be used in forming panels of the invention, including, for example, plywood and chipboard.
  • Preferably facing sheets used in the invention are able to offer some fire resistance due to their composition, the addition of fire resistant materials or coating thereof with fire resistant materials.
  • the open cell structure forming part of the core of a panel according to the invention is preferably a honeycomb structure, wherein lengths of material are bonded together at intervals or are formed into a lattice by being interwoven.
  • a honeycomb structure suitable as a core There are two principle ways of producing a honeycomb structure suitable as a core. The first way is the expansion process, in which sheets of material, having adhesive applied in strips, are cut and stacked on top of each other and then the adhesive is cured, usually under pressure and at elevated temperature. Slices are then cut to the required thickness and expanded to give the honeycomb structures.
  • the other way of making honeycomb structures is to corrugate sheets of material, apply adhesive to nodes and stack the sheets in an oven to cure.
  • the material used to form the open cell structure may be metallic or non-metallic. Aluminium is a preferred metal for forming the open cell structure. Suitable non-metallic materials for forming the open cell structure include paper and cardboard impregnated with a stiffening material, such as a resin, especially a phenolic resin, thermoplastic polyurethane sheets, fibreglass, carbon fibre in a resin, such as phenolic, epoxide or polyamide resin, and polypropylene or polyester sheets.
  • a stiffening material such as a resin, especially a phenolic resin, thermoplastic polyurethane sheets, fibreglass, carbon fibre in a resin, such as phenolic, epoxide or polyamide resin, and polypropylene or polyester sheets.
  • the honeycomb structure may be of a conventional hexagonal cell type or may be reinforced by flatsheets between each node to form trapezoidal cells.
  • the foam filling for the core of panels of the invention is preferably a synthetic foam, suitable examples of which include polyurethane, polyisocyanate and phenolic foams.
  • Opposed panel ends may be shaped or provided with complementary formations for engagement with ends of adjacent panels, such as in tongue and groove fashion or by provision of overlapping rebates.
  • the invention provides a method of making a panel comprising a pair of facing sheets profiled to include longitudinal channels which protrude from an outer face of the respective facing sheet and a core, wherein the core comprises an open cell structure having walls extending between the facing sheets and a foam filling, the method comprising the steps of laying out one profiled facing sheet with the open cell structure thereon, pouring the foam filling in uncured or partially uncured state into the open cell structure to fill the longitudinal channels, laying the other facing sheet on top of the open cell structure and curing the foam filling to form a cohesive structure, the open cell structure not extending into the channels.
  • Advantage of panels according to the invention may also include improved strength against impact damage as well as dimensional stability.
  • Panels of the invention are suitable as building panels and as such may be used, for example, as wall panels, roof panels, floor panels (decking) and for making doors, especially fire doors or roller shutter doors.
  • Figure 1 shows a first panel according to the invention.
  • a wall panel 10 comprises inner and outer facing sheets 12 and 14 respectively sandwiching a core 16.
  • the outer facing sheet 12 is of embossed galvanised steel with spaced, parallel, alternate wide and narrow trapezoidal section profiles with channels 18 and 20 respectively.
  • the inner facing sheet 14 is also of embossed, galvanised steel. Both sheets 12 and 14 have on their outer faces coatings for protection against corrosion.
  • the core 16 comprises a honeycomb structure 22 with its cells 24 bridging to the facing sheets and a filling 26 of polyurethane or polyisocyanate foam.
  • the honeycomb structure 22 may be of aluminium or of phenolic resin impregnated paper.
  • the panel illustrated in Figure 1 of the accompanying drawings may be made in the following way.
  • One facing sheet is load down and the honeycomb structure load thereon.
  • Uncured or partially cured polyurethane or polyisocyanate foam in flowable form is poured onto the honeycomb structure, the underlying facing sheet acting as a tray.
  • the other facing sheet is laid on top and the foam cured. As the foam cures it bonds to the two facing sheets.
  • honeycomb structure used in the illustrated embodiment may, of course, be substituted by a honeycomb structure made of any other suitable material such as of sheets of polyurethane, fibreglass, carbon fibre, polypropylene or polyester.
  • Panels of the invention may have several advantages over prior art panels.
  • the open cell core provides strength enhancing load spanning characteristics of the panels and the overall flatness of the panels can be improved relative to prior art panels.
  • the panels perform better in fire situations in the respects of structural integrity and control of spread of smoke.
  • the open cell core structure can retain smoke and hence delay its escape.
  • Panels having an outer profiled facing sheet also provide a means for venting smoke to the exterior of a building upwards along the profiles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)
  • Panels For Use In Building Construction (AREA)
  • Finishing Walls (AREA)

Abstract

A panel comprises a pair of facing sheets and a core which comprises an open cell honeycomb structure filled with foam and having walls which extend between the facing sheets and the foam filling. The walls of the honeycomb structure bridge the space defined between the two facing sheets. <IMAGE>

Description

This invention concerns panels, especially building panels for use in constructing walls and roofs.
Building panels are known which comprise metal facing sheets and a core of polyurethane foam. Whilst having good insulation properties, these panels do have some disadvantages. One disadvantage is that they have a limit on their load bearing capacity even when made relatively thick because polyurethane foam is not particularly strong. Another disadvantage arises simply from the use of polyurethane foam which gives off toxic fumes in fire situations. Increasingly, therefore, there is a movement away from using such wall panels.
A known building panel is disclosed in US-A-2744042. The disclosed panel is a laminate in which a foamed resin is disposed within the interstices of a honeycomb structure in order to secure minimum density and still return relatively good strength, and impact resistance.
An object of this invention is to provide panels which do not suffer from, or at least alleviate, the disadvantages referred to above.
According to this invention there is provided a panel comprising a pair of facing sheets and a core which comprises an open cell structure having walls extending between the facing sheets and a foam filling, the panel being characterised in that at least one facing sheet is profiled in the form of longitudinal channels which protrude from the outer face of the said at least one facing panel and are filled with the foam filling with the open cell structure not extending into the channels.
The facing sheets may be of metal, especially of steel, more especially of galvanised steel. Preferably the outer faces of the or each facing sheet are covered or coated with a corrosion protection layer.
Typically, the channels are trapezoidal in section having a narrower base than open side. In a fire situation, the profile channels provide passages for escape of fumes from the foam unhindered by the open cell structure. The fumes can, therefore, be directed upwards out of top edges of panels and away from the interior of the building.
The facing sheets may alternatively be made of non-metallic materials and as such are preferably rigid boards. Examples of suitable rigid boards for use in the invention include particle boards, cement particle boards, glass fibre reinforced cement boards, cellulose reinforced gypsum boards, crushed slate boards and resin boards. Wooden facing sheets or composite wooden facing sheets may also be used in forming panels of the invention, including, for example, plywood and chipboard. Preferably facing sheets used in the invention are able to offer some fire resistance due to their composition, the addition of fire resistant materials or coating thereof with fire resistant materials.
The open cell structure forming part of the core of a panel according to the invention is preferably a honeycomb structure, wherein lengths of material are bonded together at intervals or are formed into a lattice by being interwoven. There are two principle ways of producing a honeycomb structure suitable as a core. The first way is the expansion process, in which sheets of material, having adhesive applied in strips, are cut and stacked on top of each other and then the adhesive is cured, usually under pressure and at elevated temperature. Slices are then cut to the required thickness and expanded to give the honeycomb structures. The other way of making honeycomb structures is to corrugate sheets of material, apply adhesive to nodes and stack the sheets in an oven to cure.
The material used to form the open cell structure may be metallic or non-metallic. Aluminium is a preferred metal for forming the open cell structure. Suitable non-metallic materials for forming the open cell structure include paper and cardboard impregnated with a stiffening material, such as a resin, especially a phenolic resin, thermoplastic polyurethane sheets, fibreglass, carbon fibre in a resin, such as phenolic, epoxide or polyamide resin, and polypropylene or polyester sheets.
The honeycomb structure may be of a conventional hexagonal cell type or may be reinforced by flatsheets between each node to form trapezoidal cells.
The foam filling for the core of panels of the invention is preferably a synthetic foam, suitable examples of which include polyurethane, polyisocyanate and phenolic foams.
Opposed panel ends may be shaped or provided with complementary formations for engagement with ends of adjacent panels, such as in tongue and groove fashion or by provision of overlapping rebates.
In another aspect, the invention provides a method of making a panel comprising a pair of facing sheets profiled to include longitudinal channels which protrude from an outer face of the respective facing sheet and a core, wherein the core comprises an open cell structure having walls extending between the facing sheets and a foam filling, the method comprising the steps of laying out one profiled facing sheet with the open cell structure thereon, pouring the foam filling in uncured or partially uncured state into the open cell structure to fill the longitudinal channels, laying the other facing sheet on top of the open cell structure and curing the foam filling to form a cohesive structure, the open cell structure not extending into the channels.
Advantage of panels according to the invention may also include improved strength against impact damage as well as dimensional stability.
Panels of the invention are suitable as building panels and as such may be used, for example, as wall panels, roof panels, floor panels (decking) and for making doors, especially fire doors or roller shutter doors.
This invention will now be further described, by way of example only, with reference to the accompanying drawings, in which:-
Figure 1 shows a first panel according to the invention.
Referring to Figure 1 of the accompanying drawings, a wall panel 10 comprises inner and outer facing sheets 12 and 14 respectively sandwiching a core 16. The outer facing sheet 12 is of embossed galvanised steel with spaced, parallel, alternate wide and narrow trapezoidal section profiles with channels 18 and 20 respectively. The inner facing sheet 14 is also of embossed, galvanised steel. Both sheets 12 and 14 have on their outer faces coatings for protection against corrosion.
The core 16 comprises a honeycomb structure 22 with its cells 24 bridging to the facing sheets and a filling 26 of polyurethane or polyisocyanate foam. The honeycomb structure 22 may be of aluminium or of phenolic resin impregnated paper.
The panel illustrated in Figure 1 of the accompanying drawings may be made in the following way. One facing sheet is load down and the honeycomb structure load thereon. Uncured or partially cured polyurethane or polyisocyanate foam in flowable form is poured onto the honeycomb structure, the underlying facing sheet acting as a tray. The other facing sheet is laid on top and the foam cured. As the foam cures it bonds to the two facing sheets.
The honeycomb structure used in the illustrated embodiment may, of course, be substituted by a honeycomb structure made of any other suitable material such as of sheets of polyurethane, fibreglass, carbon fibre, polypropylene or polyester.
Panels of the invention may have several advantages over prior art panels. The open cell core provides strength enhancing load spanning characteristics of the panels and the overall flatness of the panels can be improved relative to prior art panels. The panels perform better in fire situations in the respects of structural integrity and control of spread of smoke. The open cell core structure can retain smoke and hence delay its escape. Panels having an outer profiled facing sheet also provide a means for venting smoke to the exterior of a building upwards along the profiles.

Claims (27)

  1. A panel comprising a pair of facing sheets (12, 14) and a core (16) which comprises an open cell structure (22) having walls extending between the facing sheets and a foam filling (26), the panel being characterised in that at least one facing sheet is profiled in the form of longitudinal channels (18, 20) which protrude from the outer face of the said at least one facing panel and are filled with the foam filling with the open cell structure not extending into the channels.
  2. A panel as claimed in claim 1, wherein the open cell structure is a honeycomb structure (22).
  3. A panel as claimed in claim 2, wherein the honeycomb structure comprises lengths of material bonded together at intervals.
  4. A panel as claimed in claim 2, wherein the honeycomb structure comprises lengths of material interwoven into a lattice.
  5. A panel as claimed in any one of claims 1 to 4, wherein the open cell structure is of metal.
  6. A panel as claimed in claim 5, wherein the open cell structure is of aluminium.
  7. A panel as claimed in any one of claims 1 to 4, wherein the open cell structure is non-metallic.
  8. A panel as claimed in claim 7, wherein the open cell structure is of paper or cardboard impregnated with a stiffening material.
  9. A panel as claimed in claim 8, wherein the stiffening material is a resin.
  10. A panel as claimed in claim 9, wherein the resin is a phenolic resin.
  11. A panel as claimed in claim 7, wherein the open cell structure is of a material selected from thermoplastic polyurethane sheets, fibreglass, carbon fibre in a resin, polypropylene sheets and polyester sheets.
  12. A panel as claimed in any one of claims 1 to 11, wherein the foam filling is a synthetic foam.
  13. A panel as claimed in claim 12, wherein the foam filling is selected from polyurethane, polyisocyanate and phenolic foams.
  14. A panel as claimed in any one of claims 1 to 13, wherein the facing sheets are of metal.
  15. A panel as claimed in claim 14, wherein the facing sheets are of steel.
  16. A panel as claimed in any one of claims 1 to 15, wherein the longitudinal channels are trapezoidal in section having a narrower base than open side.
  17. A panel as claimed in any one of claims 14 to 16, wherein outer faces of one or both of the facing sheets is or are covered with a corrosion protection layer.
  18. A panel as claimed in any one of claims 1 to 13, wherein the facing sheets are of non-metallic material.
  19. A panel as claimed in claim 18, wherein the facing sheets are of rigid board.
  20. A panel as claimed in claim 19, wherein the rigid board is selected from particle boards, cellulose reinforced gypsum boards, crushed slate boards and resin boards.
  21. A panel as claimed in claim 18, wherein the facing sheets are of wood or a wood composite.
  22. A panel as claimed in claim 21, wherein the facing sheets are of plywood or chipboard.
  23. A panel as claimed in any one of claims 1 to 22, wherein facing sheets have fire resistant materials added thereto or are coated therewith.
  24. A panel as claimed in any one of claims 1 to 23, wherein opposed panel ends are shaped or provided with complementary formations for engagement with ends of adjacent panels.
  25. A panel as claimed in claim 24, wherein said complementary formations comprise a tongue on one end and a corresponding groove on the other end of the panel.
  26. A panel as claimed in claim 24, wherein opposite ends of the panel are rebated oppositely whereby a rebate of one panel is over-lappable with a rebate of an adjacent panel.
  27. A method of making a panel comprising a pair of facing sheets profiled to include longitudinal channels which protrude from the outer face of the respective facing sheet, and a core which comprises an open cell structure having walls extending between the facing sheets and a foam filling, the method being characterised by the steps of laying out one profiled facing sheet with the open cell structure thereon, pouring the foam filling in uncured or partially uncured state into the open cell structure to fill the longitudinal channels, laying the other facing sheet on top of the open cell structure and curing the foam filling to form a cohesive structure, the open cell structure not extending into the channels.
EP96935072A 1995-10-24 1996-10-24 Panels Expired - Lifetime EP0857244B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99122668A EP0980937A3 (en) 1995-10-24 1996-10-24 Panels

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9521713 1995-10-24
GBGB9521713.9A GB9521713D0 (en) 1995-10-24 1995-10-24 Panels
GB9525470 1995-12-13
GBGB9525470.2A GB9525470D0 (en) 1995-12-13 1995-12-13 Panels
PCT/GB1996/002598 WO1997015736A1 (en) 1995-10-24 1996-10-24 Panels

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP99122668A Division EP0980937A3 (en) 1995-10-24 1996-10-24 Panels

Publications (2)

Publication Number Publication Date
EP0857244A1 EP0857244A1 (en) 1998-08-12
EP0857244B1 true EP0857244B1 (en) 2000-08-23

Family

ID=26307991

Family Applications (2)

Application Number Title Priority Date Filing Date
EP96935072A Expired - Lifetime EP0857244B1 (en) 1995-10-24 1996-10-24 Panels
EP99122668A Withdrawn EP0980937A3 (en) 1995-10-24 1996-10-24 Panels

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP99122668A Withdrawn EP0980937A3 (en) 1995-10-24 1996-10-24 Panels

Country Status (7)

Country Link
EP (2) EP0857244B1 (en)
AT (1) ATE195781T1 (en)
AU (1) AU7316796A (en)
DE (1) DE69609981T2 (en)
ES (1) ES2152046T3 (en)
GB (1) GB2321482B (en)
WO (1) WO1997015736A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013055968A1 (en) * 2011-10-12 2013-04-18 Hunter Douglas Industries Switzerland Gmbh Resin panels with embedded structured-cores and methods of making the same
USD810961S1 (en) 2009-05-13 2018-02-20 3Form, Llc Structured-core laminate panel

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1120509A1 (en) * 2000-01-26 2001-08-01 Tonelli S.A. Method for manufacturing structural elements substantially made of cellulose-based material, stiffened, and related structural element
GB2380971B (en) * 2001-08-30 2004-12-29 Kingspan Res & Dev Ltd Honeycomb insulating panels
DE20316549U1 (en) * 2003-10-27 2005-03-03 Viessmann Kältetechnik AG Insulated floor for cold room has cellular underlay construction between two sandwich panels
ES2302394B2 (en) 2003-11-19 2009-07-28 British Robertson, S.L.U. PANEL WITH MACHIHEMBRATED REMATES FOR FACADES OR COVERS.
WO2013181716A1 (en) * 2012-06-07 2013-12-12 Idc Solutions Pty Ltd Panel
EP3031994A1 (en) * 2014-12-08 2016-06-15 Svoboda Piotr Slebioda Fire resistant structural panel with a pir core
DE102015121101A1 (en) * 2015-12-03 2017-06-08 Technische Universität Darmstadt Gebäudehüllelement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744042A (en) * 1951-06-21 1956-05-01 Goodyear Tire & Rubber Laminated panels
GB802686A (en) * 1955-03-31 1958-10-08 Bettinger Corp Improvements in or relating to honeycomb structures
US3998024A (en) * 1975-08-04 1976-12-21 H. H. Robertson Company Double-skin insulated building panel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD810961S1 (en) 2009-05-13 2018-02-20 3Form, Llc Structured-core laminate panel
WO2013055968A1 (en) * 2011-10-12 2013-04-18 Hunter Douglas Industries Switzerland Gmbh Resin panels with embedded structured-cores and methods of making the same

Also Published As

Publication number Publication date
DE69609981T2 (en) 2001-03-01
EP0980937A2 (en) 2000-02-23
GB2321482B (en) 2000-03-29
EP0857244A1 (en) 1998-08-12
WO1997015736A1 (en) 1997-05-01
GB2321482A (en) 1998-07-29
ATE195781T1 (en) 2000-09-15
EP0980937A3 (en) 2000-03-15
ES2152046T3 (en) 2001-01-16
AU7316796A (en) 1997-05-15
DE69609981D1 (en) 2000-09-28
GB9808413D0 (en) 1998-06-17

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