EP0822016A1 - Method for producing bimetallic material - Google Patents

Method for producing bimetallic material Download PDF

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Publication number
EP0822016A1
EP0822016A1 EP97660073A EP97660073A EP0822016A1 EP 0822016 A1 EP0822016 A1 EP 0822016A1 EP 97660073 A EP97660073 A EP 97660073A EP 97660073 A EP97660073 A EP 97660073A EP 0822016 A1 EP0822016 A1 EP 0822016A1
Authority
EP
European Patent Office
Prior art keywords
extrusion
bimetallic
essentially
extruded
bimetallic material
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.)
Granted
Application number
EP97660073A
Other languages
German (de)
French (fr)
Other versions
EP0822016B1 (en
Inventor
Vanhatalo Voitto
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.)
Luvata Oy
Original Assignee
Outokumpu Copper Products Oy
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 Outokumpu Copper Products Oy filed Critical Outokumpu Copper Products Oy
Publication of EP0822016A1 publication Critical patent/EP0822016A1/en
Application granted granted Critical
Publication of EP0822016B1 publication Critical patent/EP0822016B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/005Continuous extrusion starting from solid state material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00Extruding metal; Impact extrusion
    • B21C23/22Making metal-coated products; Making products from two or more metals
    • B21C23/24Covering indefinite lengths of metal or non-metal material with a metal coating

Definitions

  • the present invention relates to a method for producing bimetallic material in a continuous process, so that the number of working steps in the process can be essentially reduced.
  • bimetallic material means a metal product formed of two metal components, where the components are either metals as such or metal alloys.
  • the components are either metals as such or metal alloys.
  • bimetallic materials let us point out for instance a metal product formed of copper and of columbic titanium filaments contained therein used as superconductor.
  • a superconductor which is high in copper and low in columbic titanium can be produced for instance as a channel conductor, where the columbic titanium serving as the superconductor is joined to a groove in the copper profile by means of soldering.
  • the insulation is generally carried out by means of an enamelling process. In enamelling, the processing temperature of the channel conductor rises above the soldering temperature, in which case the soldering joint breaks open and the conductor is destroyed.
  • a superconductor which is high in copper and low in columbic titanium can also be produced as a monolithic conductor, where columbic titanium is first packed inside the copper, and the ready-made superconductor is obtained as a final product from a production line including several working steps and heat treatments. From the point of view of the outcome, the multi-step production process is necessary for the columbic titanium only; when produced like this, copper is part of the conductor and passes there along at all stages.
  • a monolithic conductor is not so desirable as a channel conductor, but a monolithic conductor can be insulated in the enamelling process without damaging the conductor.
  • the Conform method In continuous extrusion, there is often applied a method described in the GB patent 1,370,894, called the Conform method.
  • the material to be extruded is conducted into a groove formed on the outer circumference of a wheel-like member. While the wheel turns around its axis, the material to be extruded enters into contact with a cooperating shoe structure essentially filling the groove, so that the motion of the material to be extruded is changed in relation to the wheel-like member.
  • the material is rendered to be extruded in the proceeding direction thereof, prior to the shoe structure or through an extrusion aperture provided in the shoe.
  • the object of the present invention is to eliminate some of the drawbacks of the prior art and to achieve an improved and more economical in costs method for producing bimetallic material in continuous extrusion.
  • the essential novel features of the invention are apparent from the appended claims.
  • the bimetallic material to be produced is extruded in a continuously operated extrusion machine, such as a Conform machine, so that the material flows in an essentially laminar fashion throughout the working process. Moreover, the bimetallic material is removed from the continuous extrusion machine essentially in the radial direction.
  • a continuously operated extrusion machine such as a Conform machine
  • the bimetallic material is removed from the continuous extrusion machine essentially in the radial direction.
  • the bimetallic component with a larger volume is advantageously worked into a grooved profile, and the bimetallic component with a smaller volume is inserted in the groove of said profile.
  • the obtained unit of bimetallic components to be extruded is fed onto the wheel-like feed member of a continuously operated extrusion machine, the outer circumference of said wheel being advantageously provided with a groove.
  • the bimetallic material to be extruded is for instance a superconductor material that is high in copper and low in columbic titanium
  • the mixing of the different bimetallic components must be prevented. Consequently, the bimetallic blank obtained from the feed member of a continuously operated extrusion machine is conducted into extrusion, so that the bimetallic material flows in an essentially laminar fashion throughout the extrusion process.
  • the extruded bimetallic material can be removed from the extrusion machine in an essentially radial direction with respect to the wheel-like feeding device of the extrusion machine.
  • the cooperating shoe structure essentially filling the groove of the feed member in a continuously operated extrusion machine, as well as the extrusion member containing the extrusion aperture, are advantageously designed so that there is obtained an essentially laminar flow of the material to be extruded for the duration of the whole extrusion process.
  • the channel leading to the extrusion aperture provided in the extrusion member must, at least as for the first wall in the feeding direction of the material to be extruded, be designed so that the radius of curvature at the beginning of the channel wall is at least 70 percentages, advantageously 80 - 90 percentages, of the largest diameter of the extrusion aperture, when the aperture is for example oval-shaped, or of the diameter of the extrusion aperture, when the aperture is round.
  • the cooperating shoe member essentially filling the groove of the feed member of the extrusion machine is designed so that the cooperating shoe forms an essentially concentric circular curve with the first wall in the feeding direction of the material of the channel leading to the extrusion aperture.
  • the cooperating shoe can also be rendered in the desired shape so that the material to be extruded as such forms a non-flowing area in front of the cooperating shoe, and at the border surface of the non-flowing and flowing areas the non-flowing area forms, in the feeding direction of the material of the channel leading to the extrusion aperture, an essentially concentric circular curve with the first wall, advantageously for a section corresponding a central angle of 40 degrees at maximum, when starting from the changing point of the flow and seen in the feeding direction of the material.
  • the bimetallic component with a smaller volume is located centrally as the desired core material, surrounded by a jacket made of the material with a larger volume.
  • this kind of production of the bimetallic material is advantageously carried out in a one-step continuous process, while the extrusion ratio is such that the extrusion temperature is at least 600° C.
  • the different components 1 and 2 of the desired bimetallic material are fed into the feeding device 4 of a continuously operated extrusion machine 3.
  • the component 1 is formed as a grooved profile, and the component 2 is inserted in the groove thereof.
  • the feeding device 4 is essentially wheel-like, and the components 1 and 2 are together fed into the groove provided on the outer circumference of the feeding device 4.
  • the feeding device 4 transfers a bimetallic blank 5 containing the components 1 and 2 to the extrusion zone.
  • a cooperating shoe member 6 filling the groove of the feeding device 4 guides the bimetallic blank to the extrusion aperture 7.
  • the first wall 9 in the feeding direction of the extrusion member 8 is rounded, so that the radius of curvature of the wall 9 is 80 percentages of the diameter of the extrusion aperture 7.
  • a non-flowing area 10 in front of the cooperating shoe 6 there is formed, of at least part of the material to be extruded, a non-flowing area 10, the border surface 11 with the flowing material whereof forms an essentially concentric circular curve with the wall 9 for the section that corresponds to a central angle a of about 35 degrees, when starting from the point of change of the flow and seen in the feeding direction of the material.
  • the border surface 11 extends from the groove on the outer circumference of the feeding device 4 to the wall 12 of the extrusion machine.
  • the extruded, ready-made bimetallic material is discharged from the continuously operated extrusion machine 3 in an essentially radial direction with respect to the wheel of the feeding device 4.

Abstract

The invention relates to a method for producing bimetallic material in a continuously operated extrusion machine (3), in which method the bimetallic components (1, 2) are fed together into the extrusion zone. According to the invention, the bimetallic material (1, 2) to be extruded is made to flow in an essentially laminar fashion throughout the extrusion, and the bimetallic material (1, 2) is made to be discharged from the extrusion machine (3) in an essentially radial direction with respect to the outer circumference of the feeding device (4) of the extrusion machine.

Description

The present invention relates to a method for producing bimetallic material in a continuous process, so that the number of working steps in the process can be essentially reduced.
In this connection, bimetallic material means a metal product formed of two metal components, where the components are either metals as such or metal alloys. Among such bimetallic materials, let us point out for instance a metal product formed of copper and of columbic titanium filaments contained therein used as superconductor.
A superconductor which is high in copper and low in columbic titanium can be produced for instance as a channel conductor, where the columbic titanium serving as the superconductor is joined to a groove in the copper profile by means of soldering. When this type of channel conductor is wished to be insulated, the insulation is generally carried out by means of an enamelling process. In enamelling, the processing temperature of the channel conductor rises above the soldering temperature, in which case the soldering joint breaks open and the conductor is destroyed.
A superconductor which is high in copper and low in columbic titanium can also be produced as a monolithic conductor, where columbic titanium is first packed inside the copper, and the ready-made superconductor is obtained as a final product from a production line including several working steps and heat treatments. From the point of view of the outcome, the multi-step production process is necessary for the columbic titanium only; when produced like this, copper is part of the conductor and passes there along at all stages.
As for the production costs and unit length, a monolithic conductor is not so desirable as a channel conductor, but a monolithic conductor can be insulated in the enamelling process without damaging the conductor.
In continuous extrusion, there is often applied a method described in the GB patent 1,370,894, called the Conform method. In this method the material to be extruded is conducted into a groove formed on the outer circumference of a wheel-like member. While the wheel turns around its axis, the material to be extruded enters into contact with a cooperating shoe structure essentially filling the groove, so that the motion of the material to be extruded is changed in relation to the wheel-like member. Thus the material is rendered to be extruded in the proceeding direction thereof, prior to the shoe structure or through an extrusion aperture provided in the shoe. By means of the Conform method, there can advantageously be extruded essentially long pieces with different shapes in cross-section.
The object of the present invention is to eliminate some of the drawbacks of the prior art and to achieve an improved and more economical in costs method for producing bimetallic material in continuous extrusion. The essential novel features of the invention are apparent from the appended claims.
According to the invention, the bimetallic material to be produced is extruded in a continuously operated extrusion machine, such as a Conform machine, so that the material flows in an essentially laminar fashion throughout the working process. Moreover, the bimetallic material is removed from the continuous extrusion machine essentially in the radial direction. Thus for instance for a bimetallic material that is high in copper and low in columbic titanium, there is advantageously obtained the length of the state-of-the-art channel conductor and the insulation capacity of the monolithic conductor.
In order to feed bimetallic material to be extruded into a continuously operated extrusion machine, the bimetallic component with a larger volume is advantageously worked into a grooved profile, and the bimetallic component with a smaller volume is inserted in the groove of said profile. The obtained unit of bimetallic components to be extruded is fed onto the wheel-like feed member of a continuously operated extrusion machine, the outer circumference of said wheel being advantageously provided with a groove.
When the bimetallic material to be extruded is for instance a superconductor material that is high in copper and low in columbic titanium, the mixing of the different bimetallic components must be prevented. Consequently, the bimetallic blank obtained from the feed member of a continuously operated extrusion machine is conducted into extrusion, so that the bimetallic material flows in an essentially laminar fashion throughout the extrusion process. Moreover, because the components of the bimetallic material are in mutual contact already at the feeding stage, the extruded bimetallic material can be removed from the extrusion machine in an essentially radial direction with respect to the wheel-like feeding device of the extrusion machine.
According to the invention, the cooperating shoe structure essentially filling the groove of the feed member in a continuously operated extrusion machine, as well as the extrusion member containing the extrusion aperture, are advantageously designed so that there is obtained an essentially laminar flow of the material to be extruded for the duration of the whole extrusion process. In order to create the laminar flow, the channel leading to the extrusion aperture provided in the extrusion member must, at least as for the first wall in the feeding direction of the material to be extruded, be designed so that the radius of curvature at the beginning of the channel wall is at least 70 percentages, advantageously 80 - 90 percentages, of the largest diameter of the extrusion aperture, when the aperture is for example oval-shaped, or of the diameter of the extrusion aperture, when the aperture is round. Moreover, the cooperating shoe member essentially filling the groove of the feed member of the extrusion machine is designed so that the cooperating shoe forms an essentially concentric circular curve with the first wall in the feeding direction of the material of the channel leading to the extrusion aperture. The cooperating shoe can also be rendered in the desired shape so that the material to be extruded as such forms a non-flowing area in front of the cooperating shoe, and at the border surface of the non-flowing and flowing areas the non-flowing area forms, in the feeding direction of the material of the channel leading to the extrusion aperture, an essentially concentric circular curve with the first wall, advantageously for a section corresponding a central angle of 40 degrees at maximum, when starting from the changing point of the flow and seen in the feeding direction of the material.
When applying the method according to the invention for producing bimetallic material, the bimetallic component with a smaller volume is located centrally as the desired core material, surrounded by a jacket made of the material with a larger volume. In the method according to the invention, this kind of production of the bimetallic material is advantageously carried out in a one-step continuous process, while the extrusion ratio is such that the extrusion temperature is at least 600° C.
The invention is explained in more detail below, with reference to the appended drawing illustrating a preferred embodiment of the invention.
According to the figure, the different components 1 and 2 of the desired bimetallic material are fed into the feeding device 4 of a continuously operated extrusion machine 3. The component 1 is formed as a grooved profile, and the component 2 is inserted in the groove thereof. The feeding device 4 is essentially wheel-like, and the components 1 and 2 are together fed into the groove provided on the outer circumference of the feeding device 4. The feeding device 4 transfers a bimetallic blank 5 containing the components 1 and 2 to the extrusion zone. In the extrusion zone, a cooperating shoe member 6 filling the groove of the feeding device 4 guides the bimetallic blank to the extrusion aperture 7. In order to make the bimetallic blank 5 to proceed in a laminar fashion in the different steps of the extrusion, the first wall 9 in the feeding direction of the extrusion member 8 is rounded, so that the radius of curvature of the wall 9 is 80 percentages of the diameter of the extrusion aperture 7. Likewise, in order to make the bimetallic material to proceed in a laminar fashion, in front of the cooperating shoe 6 there is formed, of at least part of the material to be extruded, a non-flowing area 10, the border surface 11 with the flowing material whereof forms an essentially concentric circular curve with the wall 9 for the section that corresponds to a central angle a of about 35 degrees, when starting from the point of change of the flow and seen in the feeding direction of the material. Advantageously the border surface 11 extends from the groove on the outer circumference of the feeding device 4 to the wall 12 of the extrusion machine. The extruded, ready-made bimetallic material is discharged from the continuously operated extrusion machine 3 in an essentially radial direction with respect to the wheel of the feeding device 4.

Claims (6)

  1. A method for producing bimetallic material in a continuously operated extrusion machine (3), in which method the bimetallic components (1, 2) are fed together into the extrusion zone, characterized in that the bimetallic material (1, 2) to be extruded is made to flow in an essentially laminar fashion throughout the extrusion, and that the bimetallic material (1, 2) is made to discharge from the extrusion machine (3) in an essentially radial direction with respect to the outer circumference of the feeding device (4) of the extrusion machine.
  2. A method according to claim 1, characterized in that in order to achieve an essentially laminar flow, as the counter surface (11) for the cooperating shoe (6) of the extrusion machine there is formed, together with the wall (9) which is essentially first in the feeding direction of the extrusion member, an essentially concentric circular curve extending advantageously for a section corresponding to a central angle (α) of 40 degrees at maximum, when starting from the point of change of the flow and seen in the feeding direction of the components (1, 2).
  3. A method according to claim 2, characterized in that the counter surface of the cooperating shoe (6) is formed of at least part of the material to be extruded.
  4. A method according to any of the preceding claims, characterized in that the first wall (9) in the feeding direction of the extrusion member (8) is rounded so that the radius of curvature of the wall (9) is at least 70 percentages, advantageously 80 - 90 percentages of the largest diameter of the extrusion aperture (7).
  5. A method according to any of the preceding claims, characterized in that the extrusion is carried out in one step.
  6. A method according to claim 5, characterized in that the extrusion temperature is at least 600° C.
EP19970660073 1996-06-26 1997-06-24 Method for producing bimetallic material Expired - Lifetime EP0822016B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI962628A FI101457B (en) 1996-06-26 1996-06-26 Methods of making a bimetallic material
FI962628 1996-06-26

Publications (2)

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EP0822016A1 true EP0822016A1 (en) 1998-02-04
EP0822016B1 EP0822016B1 (en) 2002-09-11

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EP19970660073 Expired - Lifetime EP0822016B1 (en) 1996-06-26 1997-06-24 Method for producing bimetallic material

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DE (1) DE69715332T2 (en)
FI (1) FI101457B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001026835A1 (en) * 1999-10-12 2001-04-19 Bwe Limited Copper tubing
US6619093B2 (en) 1999-10-12 2003-09-16 Bwe Limited Continuous extrusion apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542139A (en) * 1978-09-19 1980-03-25 Hitachi Cable Ltd Production of composite deformed bar
US4214469A (en) * 1977-05-05 1980-07-29 Swiss Aluminium Ltd. Process and device for the production of a composite section
JPS5641015A (en) * 1979-09-12 1981-04-17 Hitachi Cable Ltd Manufacture of composite rod

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214469A (en) * 1977-05-05 1980-07-29 Swiss Aluminium Ltd. Process and device for the production of a composite section
JPS5542139A (en) * 1978-09-19 1980-03-25 Hitachi Cable Ltd Production of composite deformed bar
JPS5641015A (en) * 1979-09-12 1981-04-17 Hitachi Cable Ltd Manufacture of composite rod

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 084 (M - 016) 17 June 1980 (1980-06-17) *
PATENT ABSTRACTS OF JAPAN vol. 005, no. 093 (M - 074) 17 June 1981 (1981-06-17) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001026835A1 (en) * 1999-10-12 2001-04-19 Bwe Limited Copper tubing
US6619093B2 (en) 1999-10-12 2003-09-16 Bwe Limited Continuous extrusion apparatus
US6655415B2 (en) 1999-10-12 2003-12-02 Bwe Limited Copper tubing

Also Published As

Publication number Publication date
DE69715332D1 (en) 2002-10-17
DE69715332T2 (en) 2003-05-22
FI101457B1 (en) 1998-06-30
FI101457B (en) 1998-06-30
FI962628A0 (en) 1996-06-26
EP0822016B1 (en) 2002-09-11
FI962628A (en) 1997-12-27

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