EP2903811A1 - Method for controlling a ceramic or metal powder press, and ceramic or metal powder press - Google Patents
Method for controlling a ceramic or metal powder press, and ceramic or metal powder pressInfo
- Publication number
- EP2903811A1 EP2903811A1 EP13798548.7A EP13798548A EP2903811A1 EP 2903811 A1 EP2903811 A1 EP 2903811A1 EP 13798548 A EP13798548 A EP 13798548A EP 2903811 A1 EP2903811 A1 EP 2903811A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive
- press
- force
- ram
- pressing
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000843 powder Substances 0.000 title claims abstract description 22
- 239000000919 ceramic Substances 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 title claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 24
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims 2
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 description 8
- 230000001419 dependent effect Effects 0.000 description 8
- 101100328887 Caenorhabditis elegans col-34 gene Proteins 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 5
- 230000002123 temporal effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
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
- B30B11/005—Control arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
-
- 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
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/0063—Control arrangements
- B28B17/0081—Process control
-
- 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
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
- B30B1/18—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by screw means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection
Definitions
- the invention relates to a method with the
- the preamble of claim 1 for controlling a ceramic and / or metal powder press for pressing a pressed material wherein at least one electric motor drive, which adjusts at least one ram pressed along a pressing direction, is controlled such that the drive the ram along a position Target path moves to a respective current desired position of the press ram and the drive in deviation from the desired position track
- the invention also relates to such a controlled ceramic and / or metal powder press for pressing a pressed material.
- Floating means that the axle can be pushed out of its position by at least one other, especially opposite axle. In doing so, however, it holds against the force programmed in the tool program for the axis against the axis displacing it, which can be seen more clearly e.g. a spring effect is comparable.
- Another application is a force-controlled reduction of the pressing force, in particular the upper,
- Floaten can therefore also as floating, controlled yielding or
- Hydraulic powder presses a particular problem in the case of screw presses, which a spindle drive
- the torque limiter is unusable.
- two servomotors with one spindle each drive a tool axis. Due to the efficiency problem of the spindles, no synchronous operation of the two servo axes can be guaranteed.
- Synchronous deviations in particular less than 0.01 mm.
- Servo drives that can be used in such spindle presses consist of current, speed and position controllers. In principle, no force control is possible with these controllers.
- the object of the invention is to improve a ceramic and / or metal powder press and a method for controlling a ceramic and / or metal powder press for pressing a pressed material using at least one electromotive drive so that a more reliable operation is enabled , in particular a force control at
- Press stamp is possible.
- the method should be applicable to such a press, which is equipped with a servo spindle drive.
- Press ram displaced along a pressing direction is driven such that the drive moves the ram along a position set path, in particular to a respective current set position of the ram and the drive in deviation from the position setpoint path
- a regulation of desired positions of at least one press ram takes place via its at least one electromotive drive depending on a measured force.
- a control can also be realized by a subsequent control by means of different interconnected control and regulating devices.
- the force of the tool axis that is to say in particular the measured force on one of the components from the press ram to its fixed point relative to a frame and possibly relative to other tool axes, is provided with suitable
- Such a regulation can be implemented for only one press die of a plurality of press dies of such a press or a press used accordingly in such a press
- Target force is specified.
- each axis can evaluate the respective force for itself and independently of the overall composite and can arrange a readjustment.
- At least one ram can be calculated and / or regulated as a function of at least one such measured force.
- an embodiment is that based on the measured force, the position setpoint path is calculated in particular for a servo axis or a plurality of servo axes, in particular calculated so that a tool axis or in particular their
- the position is not directly controlled by a direct manipulated variable of a drive, for example a voltage applied to the drive, an applied current or an oil pressure applied to the hydraulic cylinder.
- a direct manipulated variable of a drive for example a voltage applied to the drive, an applied current or an oil pressure applied to the hydraulic cylinder.
- the setpoint position itself is changed so that a controlled setpoint or setpoint position is applied to a drive control and then the drive control in turn performs a control or preferably regulation of the manipulated variables of the drive as a function of the applied regulated setpoint position. It is thus preferably a double control chain with two controllers connected in series or in particular regulations. It is yet another embodiment that as the
- Deviation a force-control deviation between the measured force and the desired force is converted into a for a position controller of the control device at least one drive convertible target position control variable.
- a force control deviation is determined and from this a desired position control variable is determined, which is used to control the electromotive drive.
- a desired position control variable is determined, which is used to control the electromotive drive.
- Target position control variable is implemented.
- the machine-specific modulus of e-modulus can refer to individual or all components in the force flow between the side of the ram facing the material to be pressed and the drive or the frame element carrying the drive. Also can for different axes or force flows different modulus of e-modulus
- the at least one ram is adjusted as part of a floating, ie in particular floating or controlled yielding or readjusted axis.
- a particularly preferred embodiment consists in a ceramic and / or metal powder press for pressing a
- control device can be an independent component or completely or partially in the respective drive or
- the one or more drives and force measuring devices may be assigned to one or more press dies or axes, which on one of the applied main pressing force
- a main pressing force can be by an electric motor drive, but optionally also by mechanical, pneumatic or hydraulic drives are applied.
- the main pressing force acts in particular via one or more press punches, which on the side opposite to the so-controlled press ram side of the pressed material
- Press punches wholly or partially underlying punch can be regulated, in particular if several pressing means are adjustable by means of electromotive drives relative to each other on the side of such a main pressing force.
- Pressing stamp is part of a floating axis.
- a plurality of rams are arranged on one side of the die opening, wherein these several
- Press rams are independently adjustable along the pressing direction.
- Press rams are independently adjustable along the pressing direction.
- a single such ram is arranged adjustable by two or more drives at the same time, one of the measured force certain, especially single
- Correction value is created for the drives.
- a press ram is arranged on a so-called plate as a punch carrier, wherein the plate is adjustable within the framework or tool by means of two or more drives along the pressing direction.
- a control deviation determined from one or more measured force values can be used to determine a common control deviation
- Target position control variable can be used for all affected drives.
- the drives are also independently controllable, in particular dependent on individually determined measured forces dependent to prevent tilting of the plate or the stamp carrier by appropriate control.
- An embodiment consists in such a press, in which the control device is designed to control at least one drive by means of a method described in this way. In other words, a press equipped with appropriate components is applied using the
- servo-motor drive is configured and / or drives a spindle preceded by the press ram.
- a position desired path of a servo axis or a plurality of servo axes is calculated so that the tool axis or in particular, their ram follows the programmed force.
- Fig. 1 individual components of a ceramic and / or
- Metal powder press and a diagram to illustrate a pressing process.
- a ceramic and / or metal powder press 1 comprises a frame 2, in which various further components are accommodated. In part, the other components are fixedly connected to the frame 2, in part relative to this and relative to each other
- Central part is a matrix 3, in whose
- Press punches 4, 5 is a pressed material 6 can be filled in the die opening.
- One or more further press punches 7 can be inserted from above into the die opening filled with pressed material 6 in order to feed the pressed product 6 to a compact
- the pressed material 6 is in particular a metallic and / or ceramic powdery and / or granular material.
- Stamp carrier 8 By means of an electric motor drive 10, which in particular a servo motor and a
- Spindle 9 has, the punch carrier 8 and the ram 7 in the pressing direction back and forth adjustable.
- a force measuring device 11 is arranged in the area of the illustrated upper frame 2, on which the drive 10 is attached or arranged, and the press ram 7, .
- the force measuring device 11 may, for example, as
- the force measuring device 11 serves to measure a pressing force acting on the pressed material 6 between these components and / or via the press ram 7 and to output them as a measured force F3.
- the central second ram 5 is arranged on a particular plate-shaped punch carrier 12.
- Die carrier 12 is relative to a lower portion of the frame 2 by way of example two electromotive
- the two drives 15, 16 adjustable along the pressing direction.
- the two drives 15, 16 in turn each have a motor and a driven by this spindle rod 13, 14.
- Force measuring devices 24, 25 are arranged in the area from the frame 2 to the pressing ram 5 in order to measure a respective momentary pressing force acting on the drives 15, 16 and to output corresponding measured values as respectively measured force F21 or F22.
- the central lower, first ram 4 is arranged on a particular plate-shaped punch carrier 17.
- the punch carrier 17 is relative to a lower portion of the frame 2 by way of example two electromotive
- Drives 20, 21 adjustable along the pressing direction.
- the two drives 20, 21 in turn each have a motor and a driven by this spindle rod 18, 19.
- Force measuring devices 22, 23 are arranged in the area from the frame 2 to the pressing ram 4 in order to measure a respective momentary pressing force acting on the drives 20, 21 and to output corresponding measured values as respectively measured force F1 or F12.
- a control device C is used to control and monitor functions of the press 1.
- the press 1 the press's
- Control device C among other things, the drives 10, 15, 16, 20, 21 to control. Especially in the case of servomotors or servo drives with their own control circuits, the
- Control device C to the servo drives or their
- the control device C provides as control signals for the drives 10, 15, 16, 20, 21 in particular setpoint control variables s3, sll, sl2, s21 or S22.
- the setpoint position control variables s3, sll, sl2, s21 or S22 may be, for example,
- the measured forces F3, Fll, F12, F21, F22 are applied for consideration in a current pressing process of the control device C.
- the control device C takes into account a predetermined pressing sequence.
- the pressing process is based on pressing forces, which of the press punches 4, 5, 7 during a temporal
- the current position a may be an actual position of the
- Drives 13, 16, 20, 21, 10 are used, in particular a determinable by the drive itself position.
- the position desired paths asl, as3 are determined as a function of the pressing forces required for the respective press dies 4, 5, 7 over the time course t.
- Force measuring means 24, 25 determines the control device C a control deviation ⁇ (21), for example, if the measured force F21 of one of the force measuring device 25 deviates from a desired force Fs for particular the measured force value of this force measuring device 25. Accordingly, the associated drive 16 is a control signal or a
- Set position control variable s21 is applied, which controls a Nachre ⁇ gelation depending on the control deviation ⁇ (21).
- control deviation ⁇ (21) and thus the desired position control variable s21 are thus force-dependent control or
- the variables influencing the respective instantaneous position a of the corresponding ram 4, 5, 7 are preferably also further variables influencing the pressing process, in particular a machine-specific modulus of elasticity E, a
- current setpoint position control variables s3, sll, sl2, s21, s22 during an ongoing pressing process can be determined in different ways. In principle, a table comparison or a calculation are possible in particular.
- a calculation can be based on a simplified model.
- the deviations of the real object from the model are coupled into the calculation via the setpoint-actual force difference.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Automation & Control Theory (AREA)
- Control Of Presses (AREA)
- Press Drives And Press Lines (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012019312.2A DE102012019312A1 (en) | 2012-10-01 | 2012-10-01 | Method for controlling a ceramic and / or metal powder press or ceramic and / or metal powder press |
PCT/DE2013/100346 WO2014053120A1 (en) | 2012-10-01 | 2013-09-30 | Method for controlling a ceramic or metal powder press, and ceramic or metal powder press |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2903811A1 true EP2903811A1 (en) | 2015-08-12 |
EP2903811B1 EP2903811B1 (en) | 2020-03-25 |
Family
ID=49680756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13798548.7A Active EP2903811B1 (en) | 2012-10-01 | 2013-09-30 | Method for controlling a ceramic or metal powder press, and ceramic or metal powder press |
Country Status (7)
Country | Link |
---|---|
US (1) | US10906262B2 (en) |
EP (1) | EP2903811B1 (en) |
JP (1) | JP6270855B2 (en) |
CN (1) | CN105102208B (en) |
DE (1) | DE102012019312A1 (en) |
ES (1) | ES2792524T3 (en) |
WO (1) | WO2014053120A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013110539B3 (en) * | 2013-09-24 | 2014-11-20 | Fette Compacting Gmbh | Process for producing a compact of powdery material |
DE102014105429B4 (en) * | 2014-04-16 | 2018-02-01 | Fette Compacting Gmbh | Method and apparatus for operating a press |
DE102014107127B4 (en) | 2014-05-20 | 2016-09-15 | Fette Compacting Gmbh | powder Press |
DE102015102212A1 (en) * | 2015-01-06 | 2016-07-07 | Andreas Gruszka | Pressing device for the production of stones |
DE102015101586B4 (en) * | 2015-02-04 | 2019-02-21 | Fette Compacting Gmbh | Powder press for the production of compacts from powdered pressed material |
JP6308195B2 (en) * | 2015-10-06 | 2018-04-11 | トヨタ自動車株式会社 | Method for controlling powder molding apparatus |
WO2018009858A1 (en) * | 2016-07-08 | 2018-01-11 | Rajendra Persaud | Nuclearized hot isostatic press |
US10107384B2 (en) | 2016-07-26 | 2018-10-23 | Toyota Motor Engineering & Manufacturing North America, Inc. | Two-piece sintered metal ravigneaux carrier |
US9869385B1 (en) | 2016-07-26 | 2018-01-16 | Toyota Motor Engineering & Manufacturing North America, Inc. | Powder metal net shape alignment feature |
US10151383B2 (en) | 2016-07-26 | 2018-12-11 | Toyota Motor Engineering & Manufacturing North America, Inc. | Braze retention feature for a carrier assembly |
US10428931B2 (en) | 2017-02-27 | 2019-10-01 | Toyota Motor Engineering & Manufacturing North America, Inc. | Braze preform for powder metal sintering |
DE102017004803A1 (en) * | 2017-05-18 | 2018-11-22 | Cosateq Gmbh | Method for operating a powder press with layer control and powder press for carrying out the method |
DE102017119342A1 (en) * | 2017-08-24 | 2019-02-28 | COSATEQ GmbH & Co. KG | Method for controlling a metal or ceramic powder press with automatic trajectory generation |
CN112454620B (en) * | 2020-10-10 | 2021-11-12 | 福建华泰集团股份有限公司 | Ceramic forming device and method |
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JPS57209797A (en) * | 1981-06-19 | 1982-12-23 | Toyota Motor Corp | Method and apparatus for controlling die position of liquid pressure type powder press |
US4447198A (en) * | 1982-10-26 | 1984-05-08 | Wehr Corporation | Hydraulic refractory press including product thickness or density control means |
FR2638118A1 (en) * | 1988-10-20 | 1990-04-27 | Adl Automation | METHOD AND APPARATUS FOR COMPRESSION AND CONTROL OF COMPRESSION OF PULVERULENT AND PRESSED MATERIALS BY APPLYING |
JP2720118B2 (en) * | 1991-08-31 | 1998-02-25 | ファナック株式会社 | Multi-stage electric powder molding machine and compression molding method |
JP3029151B2 (en) * | 1991-08-31 | 2000-04-04 | ファナック株式会社 | Electric powder molding machine |
JPH0557497A (en) * | 1991-09-04 | 1993-03-09 | Sumitomo Electric Ind Ltd | Nc powder compacting machine |
JP3551275B2 (en) * | 1995-02-17 | 2004-08-04 | 玉川マシナリー株式会社 | Method and apparatus for controlling upper punch during holddown stroke of powder molding press |
DE19717217C2 (en) * | 1997-04-24 | 1999-12-02 | Fette Wilhelm Gmbh | Method and device for producing compacts from hard metal, ceramic, sintered metal or the like |
DE10010671C2 (en) * | 2000-03-04 | 2002-03-14 | Fette Wilhelm Gmbh | Process for producing pressed parts by pressing metal powder and then sintering the compact |
KR100463775B1 (en) * | 2000-12-04 | 2004-12-29 | 가부시키가이샤 무라타 세이사쿠쇼 | Powder feeding apparatus and powder forming apparatus |
DE10218633B3 (en) * | 2002-04-25 | 2004-08-19 | Tmd Friction Europe Gmbh | Press |
JP2004141916A (en) * | 2002-10-24 | 2004-05-20 | Kao Corp | Compression molding method and apparatus for powder cosmetic material |
DE102004008322B4 (en) * | 2004-02-20 | 2008-11-27 | Fette Gmbh | powder Press |
JP2008126327A (en) * | 2006-11-17 | 2008-06-05 | Fanuc Ltd | Moving locus display device |
WO2008104969A1 (en) * | 2007-02-26 | 2008-09-04 | Polygon-Tamarisk Ltd | Press for producing powder based parts using compaction |
JPWO2008114827A1 (en) * | 2007-03-20 | 2010-07-08 | 株式会社タンガロイ | Compression molding method for throw-away tip |
JP2008266752A (en) * | 2007-04-24 | 2008-11-06 | Mitsubishi Materials Techno Corp | Manufacturing method of powder molded item and powder molding apparatus |
DE102009004620A1 (en) * | 2009-01-15 | 2010-07-22 | Gkn Sinter Metals Holding Gmbh | Method for operating a pressing device for the production of compacts of constant height from pulverulent materials, control device for such a pressing device and pressing device |
EP2311587A1 (en) * | 2009-10-13 | 2011-04-20 | Osterwalder AG | Powder press |
JP5721388B2 (en) * | 2009-12-04 | 2015-05-20 | 株式会社日立製作所 | Servo press control device and control method, and servo press equipped with this control device |
DE102010008986A1 (en) * | 2010-02-24 | 2011-08-25 | Dorst Technologies GmbH & Co. KG, 82431 | Method for press parameter adjustment of a ceramic or metal powder press and ceramic or metal powder press for carrying out the method |
DE102010033998A1 (en) * | 2010-08-11 | 2012-02-16 | Dorst Technologies Gmbh & Co. Kg | Metal or ceramic powder-electric press for pressing press portion in mold, has spindle drive has spindle and spindle nut that are moved relatively, along spindle axis by spindle drive rotation |
DE102010051513A1 (en) * | 2010-11-16 | 2012-05-16 | Dorst Technologies Gmbh & Co. Kg | Ceramic powder and / or metal powder press tool, ceramic powder and / or metal powder press, modular system with such a press tool, method for assembling such a press tool |
-
2012
- 2012-10-01 DE DE102012019312.2A patent/DE102012019312A1/en not_active Withdrawn
-
2013
- 2013-09-30 CN CN201380062811.8A patent/CN105102208B/en active Active
- 2013-09-30 EP EP13798548.7A patent/EP2903811B1/en active Active
- 2013-09-30 JP JP2015534910A patent/JP6270855B2/en active Active
- 2013-09-30 US US14/431,417 patent/US10906262B2/en active Active
- 2013-09-30 WO PCT/DE2013/100346 patent/WO2014053120A1/en active Application Filing
- 2013-09-30 ES ES13798548T patent/ES2792524T3/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2014053120A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2792524T3 (en) | 2020-11-11 |
US10906262B2 (en) | 2021-02-02 |
JP2015530260A (en) | 2015-10-15 |
CN105102208A (en) | 2015-11-25 |
US20150314547A1 (en) | 2015-11-05 |
WO2014053120A1 (en) | 2014-04-10 |
EP2903811B1 (en) | 2020-03-25 |
DE102012019312A1 (en) | 2014-04-03 |
CN105102208B (en) | 2018-01-23 |
JP6270855B2 (en) | 2018-01-31 |
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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 |
|
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