EP1228856A2 - Powder compacting tool - Google Patents
Powder compacting tool Download PDFInfo
- Publication number
- EP1228856A2 EP1228856A2 EP02445013A EP02445013A EP1228856A2 EP 1228856 A2 EP1228856 A2 EP 1228856A2 EP 02445013 A EP02445013 A EP 02445013A EP 02445013 A EP02445013 A EP 02445013A EP 1228856 A2 EP1228856 A2 EP 1228856A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- punches
- compacting
- tool
- powder
- cavity
- 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.)
- Withdrawn
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
- B30B11/04—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with a fixed mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
- B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
Definitions
- the present invention relates to a method of compacting powder disposed in a matrix having a through-going cavity, at least two lower punches and at least two punches, being moved different lengths in order to create a compacted body having uniform density and different thickness in different parts thereof.
- the invention also relates to a powder compacting tool for performing the method.
- the manufacturing of compacted bodies having different thickness in different parts thereof is conventionally made by powder compacting tools in which the punches are moved with a low velocity, typically by velocities less than 1 m/s. Separate upper and lower punches for the parts of different thickness are used.
- a low velocity typically by velocities less than 1 m/s.
- Separate upper and lower punches for the parts of different thickness are used.
- the densities in the different parts of the compacted body are the same during every moment in the whole compacting operation.
- Multi-plate systems to move the separate punches with different velocities are necessary in order to obtain the same density throughout the compacting operation. Such a manufacturing leads to a complicated tool with many components and a rather sophisticated control system.
- Powder compacting tools in which the punches are moved with high velocities, typically by velocities higher than 2 m/s, are used to create compacted bodies having higher densities than compacted bodies produced by the conventional low velocity powder compacting tools.
- the objectives of the present invention are to fulfil this need and also to provide a powder compacting tool for producing bodies having different thickness in different parts thereof which has few components and which can be used in a simple manner during a high velocity compacting operation.
- the punches are actuated by the same ram unit.
- the forming chamber is defined by the side wall of a cavity in a matrix of a powder compacting tool and the end walls of at least two lower punches and at least two upper punches having different axial lengths, and the method comprises the following steps;
- the invention also relates to a powder compacting tool comprising a matrix having a through-going cavity, a first and a second upper punch, which are movable in the axial direction of the cavity, and at least two lower punches, characterised in that the upper punches have different axial lengths and that the tool comprises a single ram for moving the upper punches in sequence towards the at least two lower punches during a compacting operation and means are for holding the at least two lower punches stationary during a compacting operation.
- the tool comprises a single ram for moving the upper punches in sequence towards the at least two lower punches during a compacting operation and means are for holding the at least two lower punches stationary during a compacting operation.
- the tool comprises a first and a second upper and lower punches, the first upper and lower punches and the second upper and lower punches being opposite to each other.
- the cavity of the matrix is furthermore cylindrical and a core pin is disposed in the cavity and extended along the symmetry axis of the cavity.
- a powder compacting tool 1 for the manufacture of annular bodies having a annular flange projecting from the central portion of the outer side thereof is schematically shown in different stages of a compacting operation.
- the tool 1 comprises a matrix 2 with a through-going cavity in which a first and second upper punch 3 and 4, respectively and a first and second lower punch 5 and 6, respectively are vertically movable by suitable means.
- a first and second upper punch 3 and 4 respectively and a first and second lower punch 5 and 6, respectively are vertically movable by suitable means.
- the first upper punch 3 is shorter than the second upper punch 4 and the upper ends of the lower punches 5,6 is axially displaced in relation to each other.
- the tool also comprises a core pin 7 and a ram 8.
- the tool works in the following way.
- the upper punches 3 and 4 have been moved out of the cavity in the matrix and the lower punches are moved upwards so that upper end of the second lower punch 6 is disposed nearer the upper side of the matrix than the upper end of the first lower punch 5.
- powder is filled into the space defined by the side walls of the cavity in the matrix 2, the core pin 7 and the second lower punch 6 and the upper end wall of the first lower punch 5.
- the first and second upper punches are moved downwards until they reaches the upper side of the matrix and thereafter are all the punches moved downwards to the positions shown in Figure 1.
- Figure 1 the positions of the punches before the beginning of the compacting operation are shown, the punches and the core pin defining a forming chamber C.
- the first upper punch 3 is disposed above the second upper punch 4 by a distance d.
- the compacting operation starts by actuating the ram 8 to move downwards by a sequence of strokes or by a press force F.
- the first upper punch 3 is influenced by the ram 8, whereby the compacting of the powder in the forming chamber C begins for the part of the powder that lies between the end surfaces of the first upper and lower punches 3 and 5.
- the lower punches 5 and 6 are held stationary during the whole compacting operation.
- Figure 3 shows the positions of the punches in the end of the pressing operation, the compacted body in the forming chamber C having a central annular body with a flange, the thickness of the flange being considerably smaller than the thickness of the central body.
- the ejecting of the compacted body is made by moving all of the punches out of the cavity of the matrix by moving the lower punches upwards. Thereafter, punches 3 and 5 are pushed against the compact body by a small force and the punches 4 and 6 are retracted. Finally, the compact body is released from the punches 3 and 5.
- the distance d is so chosen that the compacted material in the central body and in the flange has the same density, i.e the powder column between the opposing end surfaces of the first upper punch 3 and the first lower punch 5 has been shortened by the same percentage as the powder column between the opposing end surfaces of the second upper punch 4 and the second lower punch 6.
- the tool can of course be used to produce compact bodies having other configuration that the one shown in the Figures, for example a compact body in which the flange is projecting from the lower part of the central body. It is also possible to produce bodies being more thick in the outer part than in the central part by making the inner punch longer than the outer punch, i.e to change the positions of the first and second punches in the described embodiment. If cylindrical bodies are to be produced instead of annular bodies, the core pin is removed.
- the bodies produced can have other forms than circular, for example square, triangular , U-shape etc. It is also possible, but not preferred, to only use one lower punch having an upper end surface adapted to the configuration of the underside of the compact body to be produced.
- the filling operation and the ejecting operation will be more complicated. Furthermore, it is also possible to provide the tool with more than two upper and lower punches if a compact body having more than two portions of different thickness is to be produced and the number of lower punches can be different from the number of upper punches, in dependence of the shape of the compact body to be manufactured.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
- The present invention relates to a method of compacting powder disposed in a matrix having a through-going cavity, at least two lower punches and at least two punches, being moved different lengths in order to create a compacted body having uniform density and different thickness in different parts thereof. The invention also relates to a powder compacting tool for performing the method.
- The manufacturing of compacted bodies having different thickness in different parts thereof is conventionally made by powder compacting tools in which the punches are moved with a low velocity, typically by velocities less than 1 m/s. Separate upper and lower punches for the parts of different thickness are used. In order to avoid cracks in the compacted body due to flowing of powder particles from areas with higher densities to areas with lower densities or breaking of bonds between particles in areas with different densities, it is essential that the densities in the different parts of the compacted body are the same during every moment in the whole compacting operation. Multi-plate systems to move the separate punches with different velocities are necessary in order to obtain the same density throughout the compacting operation. Such a manufacturing leads to a complicated tool with many components and a rather sophisticated control system.
- Powder compacting tools in which the punches are moved with high velocities, typically by velocities higher than 2 m/s, are used to create compacted bodies having higher densities than compacted bodies produced by the conventional low velocity powder compacting tools. However, it is very difficult to control the velocity of the individual punches during the whole compacting operation with such high velocity tools with the precision required for creating the same densities in different parts of a compacted body having parts with different thickness. There is therefore a need for a method of creating compacted bodies having different thickness in different parts thereof that can be easily used for high velocity powder compacting tools and that is simpler than the method known for low velocity powder compacting tools.
- The objectives of the present invention are to fulfil this need and also to provide a powder compacting tool for producing bodies having different thickness in different parts thereof which has few components and which can be used in a simple manner during a high velocity compacting operation.
- These objectives are according to the invention obtained by a method of compacting powder disposed in a forming chamber by a powder compacting tool having at least two upper punches and two lower punches, the upper punches being moved different lengths in order to create a compacted body having different thickness in different parts thereof, characterised by moving the punches in sequence and with the same velocity.
- In a preferred embodiment the punches are actuated by the same ram unit. Furthermore, the forming chamber is defined by the side wall of a cavity in a matrix of a powder compacting tool and the end walls of at least two lower punches and at least two upper punches having different axial lengths, and the method comprises the following steps;
- filling powder into a forming chamber with lower punches in filling position,
- transferring the powder by moving the lower and upper punches with slow motion to punching position
- moving the other upper punches downwards with the ram unit with high velocity and in sequence defined by the position of the punches wherewith a compact body having a different thickness in different parts thereof is obtained, and
- thereafter ejecting the compacted body.
- The invention also relates to a powder compacting tool comprising a matrix having a through-going cavity, a first and a second upper punch, which are movable in the axial direction of the cavity, and at least two lower punches, characterised in that the upper punches have different axial lengths and that the tool comprises a single ram for moving the upper punches in sequence towards the at least two lower punches during a compacting operation and means are for holding the at least two lower punches stationary during a compacting operation. During the compacting operation of such a tool it is only the upper punches that are moving, all of the upper punches being moved by the same ram. Thereby, only means for regulating the single ram is needed during the compacting operation and such a tool can be made with a minimum of components.
- In a preferred embodiment the tool comprises a first and a second upper and lower punches, the first upper and lower punches and the second upper and lower punches being opposite to each other. The cavity of the matrix is furthermore cylindrical and a core pin is disposed in the cavity and extended along the symmetry axis of the cavity.
- The invention will now be described with reference to the following Figures, of which;
- Fig. 1 schematically shows a sectional view of a powder compacting tool according to a preferred embodiment of the invention in the very beginning of a compacting operation,
- Fig. 2 shows in a view similar to Figure 1, the very beginning of the compacting of the thinner part of a work body, and
- Fig. 3 shows in a view similar to Figure 1, the end of the compacting operation.
-
- In Figures 1-3, a
powder compacting tool 1 for the manufacture of annular bodies having a annular flange projecting from the central portion of the outer side thereof is schematically shown in different stages of a compacting operation. - The
tool 1 comprises a matrix 2 with a through-going cavity in which a first and secondupper punch lower punch upper punch 3 is shorter than the secondupper punch 4 and the upper ends of thelower punches core pin 7 and aram 8. - The tool works in the following way.
- Before the powder filling, the
upper punches lower punch 6 is disposed nearer the upper side of the matrix than the upper end of the firstlower punch 5. Thereafter powder is filled into the space defined by the side walls of the cavity in the matrix 2, thecore pin 7 and the secondlower punch 6 and the upper end wall of the firstlower punch 5. Then the first and second upper punches are moved downwards until they reaches the upper side of the matrix and thereafter are all the punches moved downwards to the positions shown in Figure 1. - In Figure 1 the positions of the punches before the beginning of the compacting operation are shown, the punches and the core pin defining a forming chamber C. In the starting positions the first
upper punch 3 is disposed above the secondupper punch 4 by a distance d. - The compacting operation starts by actuating the
ram 8 to move downwards by a sequence of strokes or by a press force F. In the beginning only the firstupper punch 3 is influenced by theram 8, whereby the compacting of the powder in the forming chamber C begins for the part of the powder that lies between the end surfaces of the first upper andlower punches lower punches - When the first
upper punch 3 has been driven downwards the distance d, theram 8 reaches the level of the upper end of the secondupper punch 4 and the second upper punch will also be driven downwards by theram 8 with the same velocity as the firstupper punch 3. This stage in the compacting operation is shown in Figure 2. Thereafter, the first and second upper punch are driven downwards together until the desired thickness of the annular body and its flange is obtained. - Figure 3 shows the positions of the punches in the end of the pressing operation, the compacted body in the forming chamber C having a central annular body with a flange, the thickness of the flange being considerably smaller than the thickness of the central body.
- The ejecting of the compacted body is made by moving all of the punches out of the cavity of the matrix by moving the lower punches upwards. Thereafter,
punches punches punches - The distance d is so chosen that the compacted material in the central body and in the flange has the same density, i.e the powder column between the opposing end surfaces of the first
upper punch 3 and the firstlower punch 5 has been shortened by the same percentage as the powder column between the opposing end surfaces of the secondupper punch 4 and the secondlower punch 6. - The tool can of course be used to produce compact bodies having other configuration that the one shown in the Figures, for example a compact body in which the flange is projecting from the lower part of the central body. It is also possible to produce bodies being more thick in the outer part than in the central part by making the inner punch longer than the outer punch, i.e to change the positions of the first and second punches in the described embodiment. If cylindrical bodies are to be produced instead of annular bodies, the core pin is removed. The bodies produced can have other forms than circular, for example square, triangular , U-shape etc. It is also possible, but not preferred, to only use one lower punch having an upper end surface adapted to the configuration of the underside of the compact body to be produced. In such a case the filling operation and the ejecting operation will be more complicated. Furthermore, it is also possible to provide the tool with more than two upper and lower punches if a compact body having more than two portions of different thickness is to be produced and the number of lower punches can be different from the number of upper punches, in dependence of the shape of the compact body to be manufactured.
- By the present invention, a tool in which the compacting is accomplished with the activation of only one single ram is provided. This simplifies the compacting operating and the regulating means needed therefore.
- By the method and the tool described above flawless compacted bodies having a density of 7,3 g/cm3 have been produced of press-ready powder mixes. It is surprising that such bodies can be produced without cracks by this method, since the densities in different parts of the compacted body differs until the end of the operation. It is believed that these surprising results are due to the fact that the flowing of powder particles from areas with higher densities to areas with lower densities within the compacted body, will not take place due to the short duration of the compacting operation.
Claims (5)
- A method of compacting powder disposed in a forming chamber by a powder compacting tool, operating at high velocity and having at least two upper punches and two lower punches, the upper punches being moved different travel distance during compaction in order to create a compacted body having uniform density and different thickness in different parts thereof,
characterized in
moving the upper punches in sequence and with the same high velocity, and thereby directly actuating the upper punches with a common ram unit. - The method according to claim 1, wherein the forming chamber being defined by a side wall of a cavity in a matrix of a powder compacting tool and end walls of the at least two lower punches and the at least two upper punches having different axial lengths, the method comprising the following steps;
filling powder into forming chamber,
characterized in
placing the upper punches in such a way that the upper ends of the upper punches are positioned at different levels,
moving the upper punches in sequence with high velocity and starting with the one having the highest level, with the aid of the ram unit, and
thereafter ejecting the compacted body with the lower punches. - A powder compacting tool (1) comprising a matrix (2) having a through-going cavity, having an axial direction, at least two upper punches (3, 4), and at least two lower punches (5, 6), which are movable in the axial direction of the cavity,
characterized in that the upper punches (3, 4) are of different lengths and that the tool comprises a single ram unit (8) intended to cause a displacement of the upper punches (3,4) in sequence towards the at least two lower punches (5,6) during a compacting operation and thereby during an initial part of the compacting operation entirely keep at least one of the upper punches relieved from pressure, and means for arresting the at least two lower punches (5,6) in a stationary position during a compacting operation. - The tool according to claim 3,
characterized in that the tool (1) comprises a first upper punch (3) and a second upper punch (4) and a first lower punch (5) and a second lower punch (6), whereby the first upper and first lower punch (3, 5) and the second upper and second lower punch (4,6) being opposite to each other. - The tool according to claim 3 or 4,
characterized in that the cavity is cylindrical and that a core pin (7) is disposed in the cavity and extended along the symmetry axis of the cavity.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0100364A SE0100364D0 (en) | 2001-02-06 | 2001-02-06 | Powder compacting tool |
SE0100364 | 2001-02-06 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1228856A2 true EP1228856A2 (en) | 2002-08-07 |
EP1228856A3 EP1228856A3 (en) | 2002-08-28 |
Family
ID=20282862
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02445013A Withdrawn EP1228856A3 (en) | 2001-02-06 | 2002-02-04 | Powder compacting tool |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1228856A3 (en) |
CN (1) | CN1369368A (en) |
SE (1) | SE0100364D0 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003008131A2 (en) * | 2001-07-20 | 2003-01-30 | Hawk Precision Components Group, Inc. | Apparatus and method for high-velocity compaction of multiple-level parts |
CN106891279A (en) * | 2017-03-07 | 2017-06-27 | 郑州磨料磨具磨削研究所有限公司 | Special-shaped grinding wheel forming molds and its pressure head component and pressure head |
CN109781937A (en) * | 2017-11-15 | 2019-05-21 | 罗伯特·博世有限公司 | The sealing element of sensor element for sensor and its manufacturing method |
JP2021110031A (en) * | 2019-12-31 | 2021-08-02 | ウォンジン アルミニウム | Apparatus for producing high strength composite material |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104162851B (en) * | 2014-07-29 | 2017-01-25 | 郑州磨料磨具磨削研究所有限公司 | Pressure head and compression molding mold and method using pressure head |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3593366A (en) * | 1968-12-11 | 1971-07-20 | Wolverine Pentronix | Multiple punch tool set for powder compacting press |
US3664785A (en) * | 1968-12-13 | 1972-05-23 | Birmingham Small Arms Co Ltd | Presses for production of complex components |
DE19816969A1 (en) * | 1998-04-17 | 1999-10-21 | Komage Gellner Gmbh & Co Masch | Apparatus for production of pressed powder articles |
JP2000326100A (en) * | 1999-05-20 | 2000-11-28 | Hitachi Powdered Metals Co Ltd | Method for compacting green compact having inclined surface |
-
2001
- 2001-02-06 SE SE0100364A patent/SE0100364D0/en unknown
-
2002
- 2002-02-04 EP EP02445013A patent/EP1228856A3/en not_active Withdrawn
- 2002-02-06 CN CN 02103468 patent/CN1369368A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3593366A (en) * | 1968-12-11 | 1971-07-20 | Wolverine Pentronix | Multiple punch tool set for powder compacting press |
US3664785A (en) * | 1968-12-13 | 1972-05-23 | Birmingham Small Arms Co Ltd | Presses for production of complex components |
DE19816969A1 (en) * | 1998-04-17 | 1999-10-21 | Komage Gellner Gmbh & Co Masch | Apparatus for production of pressed powder articles |
JP2000326100A (en) * | 1999-05-20 | 2000-11-28 | Hitachi Powdered Metals Co Ltd | Method for compacting green compact having inclined surface |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 14, 5 March 2001 (2001-03-05) & JP 2000 326100 A (HITACHI POWDERED METALS CO LTD), 28 November 2000 (2000-11-28) * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003008131A2 (en) * | 2001-07-20 | 2003-01-30 | Hawk Precision Components Group, Inc. | Apparatus and method for high-velocity compaction of multiple-level parts |
WO2003008131A3 (en) * | 2001-07-20 | 2003-11-27 | Hawk Prec Components Group Inc | Apparatus and method for high-velocity compaction of multiple-level parts |
CN106891279A (en) * | 2017-03-07 | 2017-06-27 | 郑州磨料磨具磨削研究所有限公司 | Special-shaped grinding wheel forming molds and its pressure head component and pressure head |
CN106891279B (en) * | 2017-03-07 | 2019-03-01 | 郑州磨料磨具磨削研究所有限公司 | Special-shaped grinding wheel forming molds and its pressure head component and pressure head |
CN109781937A (en) * | 2017-11-15 | 2019-05-21 | 罗伯特·博世有限公司 | The sealing element of sensor element for sensor and its manufacturing method |
JP2021110031A (en) * | 2019-12-31 | 2021-08-02 | ウォンジン アルミニウム | Apparatus for producing high strength composite material |
JP7009579B2 (en) | 2019-12-31 | 2022-01-25 | ウォンジン アルミニウム | High-strength composite material manufacturing equipment |
Also Published As
Publication number | Publication date |
---|---|
SE0100364D0 (en) | 2001-02-06 |
EP1228856A3 (en) | 2002-08-28 |
CN1369368A (en) | 2002-09-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6205640B1 (en) | Method for joining together two or several overlaying sheet formed members, and apparatus for carrying out said method and a joint resulting from said method | |
EP0873855B1 (en) | Method and apparatus for manufacturing moulded articles in hard metal, ceramic, sintered metal or similar | |
EP1296782B8 (en) | Method for manufacturing of a plate involving an intermediate preforming and a final shaping | |
US4008599A (en) | Apparatus for making bevel gear | |
EP1228856A2 (en) | Powder compacting tool | |
AU2001252816A1 (en) | Method for manufacturing of a plate involving an intermediate preforming and a final shaping | |
US20060008376A1 (en) | Method and an apparatus for producing multi-level components by shock compression of powdered material | |
JP2720118B2 (en) | Multi-stage electric powder molding machine and compression molding method | |
EP3580059B1 (en) | Tool set having deflection compensation | |
US4611391A (en) | Commutator ring manufacturing method and apparatus | |
JP2007222879A (en) | Die for powder molding and powder molding method | |
US6669891B1 (en) | Method and apparatus for producing brake lining material | |
JPH0353049B2 (en) | ||
JP2765766B2 (en) | Method of molding stepped green compact and molding apparatus | |
JP2000326100A (en) | Method for compacting green compact having inclined surface | |
JPS6230079B2 (en) | ||
JPS59107003A (en) | Production of stepped sintered and forged parts | |
JP2001212699A (en) | Method for forming powdered metal body and apparatus therefor | |
JPH08281493A (en) | Press molding method for vessellike green compact | |
JPS638728Y2 (en) | ||
JP4394257B2 (en) | Method for producing powder compact | |
JPS638727Y2 (en) | ||
SU1470451A1 (en) | Apparatus for shaping blanks from plasticized powders | |
JP2010012481A (en) | Method for forming molded article | |
JPH09202902A (en) | Compacting method and compacting device |
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 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Free format text: AL;LT;LV;MK;RO;SI |
|
RIC1 | Information provided on ipc code assigned before grant |
Free format text: 7B 30B 11/02 A, 7B 30B 11/04 B |
|
18W | Application withdrawn |
Withdrawal date: 20020706 |