EP0315043A2 - Méthode pour la mesure de l'effort exercé par des cylindres de laminage - Google Patents
Méthode pour la mesure de l'effort exercé par des cylindres de laminage Download PDFInfo
- Publication number
- EP0315043A2 EP0315043A2 EP88117879A EP88117879A EP0315043A2 EP 0315043 A2 EP0315043 A2 EP 0315043A2 EP 88117879 A EP88117879 A EP 88117879A EP 88117879 A EP88117879 A EP 88117879A EP 0315043 A2 EP0315043 A2 EP 0315043A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- force
- measuring
- der
- roll
- 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- Withdrawn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
- 0 CC1(C)[*+]CCCC1 Chemical compound CC1(C)[*+]CCCC1 0.000 description 1
- HWBQWGDLRJZRPV-FAEJEUNOSA-N C[C@H](CCC1)C1(CCCC1)C11C(C)(C)CCCC1 Chemical compound C[C@H](CCC1)C1(CCCC1)C11C(C)(C)CCCC1 HWBQWGDLRJZRPV-FAEJEUNOSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/08—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/06—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring tension or compression
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/12—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll camber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/38—Strain gauges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
- B21B33/02—Preventing fracture of rolls
Definitions
- the invention relates to a method for measuring the rolling forces acting on rolling mill rolls during rolling.
- the roller bearing force is usually used today to determine the rolling force.
- the measuring locations are relatively far from the location of the introduction of the rolling force, and the rolling stands have, due to their design, play and backlash, which result in falsifications and time delays in the measured width.
- the hysteresis phenomena that occur are particularly disadvantageous.
- the invention is therefore based on the object to determine the load on the roll promptly and close to the point of application of force in a simple manner from the roll and to make it accessible for the control of the rolling processes.
- roller itself is used to determine the rolling force acting on it. It is crucial when using the roller as a measuring location that the stress per measuring location is measured in more than one angular position, based on the roller axis. This is done by installing at least two sensors per measuring point at different angles to one another.
- the rolling mill rolls are designed so that they do not require surface cooling, are resistant to thermal shock and have a long service life.
- the rolling mill rolls are made of an alloy with an average content of 0.05% C 0.50% Si 1.80% Mn 15.00% Cr 1.35% Mo 25.00% Ni 0.20% V 2.10% Ti 0.005% B Rest impurities consist.
- strain gauges or semiconductor strain gauges can be used as measuring transducers, which transform the material expansion or deflection of the roller into changes in resistance. 1 to 3, they are either attached directly to the inner wall 4 of a central measuring bore 1 or of a plurality of measuring bores 2, or else arranged on pre-wired measuring bodies 5 into the measuring bore 1 of the roller body 3.
- Measuring methods are also known which measure deflections optically.
- the deflection of a light beam emitted by a light source 6 from the zero position of the roller axis caused by the bending of the roller is measured with an optical receiver 7.
- the receiver 7 can consist of a single cell, of two single cells offset by 90 degrees or of a flat reception screen.
- glass fibers are introduced parallel to the roller axis in eccentrically arranged measuring bores and the change in length resulting from the bending of the roller in two opposite glass fibers is measured as interference.
- the control of the sensor system rotating with the roller and the transmission of the information out of the roller becomes touching, for example via slip rings, or implemented without contact, for example electromagnetically or optically.
- the courses and dependencies of the measuring signal shown in FIG. 5 result in principle.
- an element of the roller is alternately compressed and stretched during rotation.
- the frequency of the signal change is proportional to the speed of the roller, the amplitude of the measurement signal depends on the relative position of the element concerned to the direction of force application and on the amount of force applied.
- Fig. 6 the relationships are shown with two sensors offset by an angle of 90 degrees. It is typical of the 90 degree arrangement that while one measuring point is showing the measured value zero, the second measuring point has the maximum amount.
- Fig. 7 is used to explain the relationships and some sizes used.
- the two measuring devices x and y are at an angle of 90 degrees to each other.
- the current relative position to the vertical is given by the angle Phi.
- the normal force F N to be determined is composed of the vectorial addition of F Nx and F Ny .
- the angle of the force introduced, based on the stationary vertical, is thus known at all times.
- the force F N is in principle a rectified signal, which reflects the absolute amount of the stress due to the absolute height (amount of F N ) and reflects the position in relation to the vertical by the angle gamma.
- the force F N can be split into its horizontal and vertical components by vectorial force decomposition.
- the vertical force F S corresponds to the bearing force measured in the vertical direction with a good rolling force measurement.
- the horizontal force F H depends on the deformation conditions and the friction conditions in the roll gap. In addition, components from tensile forces that are transmitted via the rolling stock can be contained in the horizontal force.
- the rolling stock can be located in two or more roll stands at the same time, as is shown in FIG. 10.
- the knowledge of tensile forces that are transmitted between two rolling stands via the rolling stock is of great importance. If the tractive force is known, the tractive force can be regulated to a desired, predetermined level by influencing the stand speeds and stand settings.
- F H the measured horizontal component of the rolling force
- F HO horizontal component of the rolling force in draft-free operation
- F HR Retraction that is exerted on the rolling stock against the rolling direction by the existing roll stand
- F HV preference that is exerted on the rolling stock via a rolling stand with a larger number n - index for the framework no. (used only when needed)
- the measurements are carried out on rolling mill rolls which do not require surface cooling, are resistant to thermal shock and have a long service life.
- Cooling water is currently applied to the surface of the rolls in most deformation steps. This cooling does not allow the heating of the roller during the because of the great inaccuracy To use the rolling process as a measurement variable for determining the deformation work in addition to the rolling force.
- a stable austenite is used as the material, which according to the steel-iron list bears the brand name X5 NiCrTi 25 15 with the material no. 1.4980 or 1.4944 for aviation and the international trade name A 286.
- the use according to the invention as a heat-resistant material for the production of rolling mill rolls has the advantage that - surface cooling is not required, - due to its thermal shock resistance, the formation of surface cracks during the rolling process is avoided, -
- the service life in operating hours or in tons per roll lot is so long that frequent changeovers are not necessary, both from the point of view of the operating time and from the point of view of the financial expenditure, -
- the thermal conductivity is better than with conventional rolling materials.
- the very complex use of a full roller at shallow depths can be replaced by using a jacket made of the aforementioned material and shrunk onto an axle made of high-strength steel.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3736999 | 1987-10-31 | ||
DE19873736999 DE3736999A1 (de) | 1987-10-31 | 1987-10-31 | Verfahren zur walzkraftmessung an walzwerkswalzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0315043A2 true EP0315043A2 (fr) | 1989-05-10 |
EP0315043A3 EP0315043A3 (fr) | 1990-10-03 |
Family
ID=6339522
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880117879 Withdrawn EP0315043A3 (fr) | 1987-10-31 | 1988-10-27 | Méthode pour la mesure de l'effort exercé par des cylindres de laminage |
Country Status (7)
Country | Link |
---|---|
US (1) | US4938045A (fr) |
EP (1) | EP0315043A3 (fr) |
JP (1) | JP2726066B2 (fr) |
KR (1) | KR960007622B1 (fr) |
CA (1) | CA1321492C (fr) |
DE (1) | DE3736999A1 (fr) |
DK (1) | DK601588A (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4210495C1 (fr) * | 1992-03-31 | 1993-04-15 | Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De | |
WO2003061865A1 (fr) * | 2002-01-22 | 2003-07-31 | Bfi Vdeh - Institut Für Angewandte Forschung Gmbh | Rouleau plein permettant de déterminer les écarts de planéité |
EP1452246A2 (fr) * | 2003-02-27 | 2004-09-01 | ACHENBACH BUSCHHÜTTEN GmbH | Dispositif pour la mésure des deformations dépendant de la charge des cylindres logés dans des cages de laminoir des bandes métalliques |
EP1619488A3 (fr) * | 2004-07-23 | 2013-05-15 | Nagano Keiki Co., Ltd. | Capteur de pression |
DE102016008429A1 (de) | 2016-07-11 | 2018-01-11 | Vdeh-Betriebsforschungsinstitut Gmbh | Vorrichtung zum Ermitteln einer Kraft in einem einen Spalt mit einem Gegenkörper ausbildenden Walzkörper und Verfahren zum Ermitteln einer Kraft in einem einen Spalt mit einem Gegenkörper ausbildenden Walzkörper |
CN112077156A (zh) * | 2020-08-20 | 2020-12-15 | 燕山大学 | 一种冷轧带材板形辊挠度干扰信号消除方法 |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0556408B1 (fr) * | 1991-09-10 | 1998-03-18 | Nippon Steel Corporation | Machine de laminage de plaque |
US6064030A (en) * | 1994-05-16 | 2000-05-16 | Hoshizaki Denki Kabushiki Kaisha | Manufacturing method of rotary shaft with hard faced journal |
US5592875A (en) * | 1994-09-16 | 1997-01-14 | Stowe Woodward Licensco, Inc. | Roll having means for determining pressure distribution |
IT1304331B1 (it) * | 1997-06-24 | 2001-03-15 | Danieli Off Mecc | Sistema di controllo della configurazione dei cilindri diappoggio in gabbie di laminazione a quarto e relativo |
US6981935B2 (en) * | 2002-09-12 | 2006-01-03 | Stowe Woodward, L.L.C. | Suction roll with sensors for detecting temperature and/or pressure |
US6874232B2 (en) * | 2003-05-21 | 2005-04-05 | Stowe Woodward, Llc | Method for forming cover for industrial roll |
JP4185478B2 (ja) * | 2004-07-23 | 2008-11-26 | 長野計器株式会社 | 歪検出器およびその製造方法 |
US7572214B2 (en) * | 2005-05-04 | 2009-08-11 | Stowe Woodward L.L.C. | Suction roll with sensors for detecting operational parameters having apertures |
US10287731B2 (en) * | 2005-11-08 | 2019-05-14 | Stowe Woodward Licensco Llc | Abrasion-resistant rubber roll cover with polyurethane coating |
US9097595B2 (en) * | 2008-11-14 | 2015-08-04 | Stowe Woodward, L.L.C. | System and method for detecting and measuring vibration in an industrial roll |
US8346501B2 (en) * | 2009-06-22 | 2013-01-01 | Stowe Woodward, L.L.C. | Industrial roll with sensors arranged to self-identify angular location |
US8236141B2 (en) * | 2009-06-23 | 2012-08-07 | Stowe Woodward, L.L.C. | Industrial roll with sensors having conformable conductive sheets |
US8475347B2 (en) | 2010-06-04 | 2013-07-02 | Stowe Woodward Licensco, Llc | Industrial roll with multiple sensor arrays |
BR112014013312B1 (pt) | 2012-01-17 | 2021-03-02 | Stowe Woodward Licensco, Llc | método de determinar a posição angular de um rolo, e conjunto de rolo industrial |
US9650744B2 (en) | 2014-09-12 | 2017-05-16 | Stowe Woodward Licensco Llc | Suction roll with sensors for detecting operational parameters |
WO2017189642A1 (fr) | 2016-04-26 | 2017-11-02 | Stowe Woodward Licensco, Llc | Rouleau d'aspiration à motif de trous traversants et trous borgnes qui améliore la distance sur terrain |
JPWO2022244652A1 (fr) * | 2021-05-18 | 2022-11-24 | ||
DE102022125376A1 (de) * | 2022-09-30 | 2024-04-04 | VDEh-Betriebsforschungsinstitut Gesellschaft mit beschränkter Haftung | Messrolle zum Messen eines Bandzugs, Vorrichtung und Verfahren |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60121050A (ja) * | 1983-12-05 | 1985-06-28 | Mitsubishi Heavy Ind Ltd | ドラム式連続鋳造機のドラム |
DE8517055U1 (de) * | 1985-06-07 | 1986-10-02 | Lechler, Gerhard, Dr.-Ing., 1000 Berlin | Walze |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3404550A (en) * | 1966-04-29 | 1968-10-08 | Westinghouse Electric Corp | Workpiece shape and thickness control |
GB1199203A (en) * | 1966-11-30 | 1970-07-15 | Nippon Kokan Kk | Apparatus for Controlling the Shape of a Workpiece During Rolling |
FR1601481A (fr) * | 1968-12-12 | 1970-08-24 | ||
DE2630410A1 (de) * | 1976-07-06 | 1978-01-12 | Betr Forsch Inst Angew Forsch | Vorrichtung zur messung der spannungsverteilung ueber die breite von biegsamen baendern, vor allem von stahlbaendern beim kaltwalzen |
JPS5597806A (en) * | 1979-01-17 | 1980-07-25 | Hitachi Ltd | Method and apparatus for correcting asymmetry of rolling mill |
DE3109536C3 (de) * | 1981-03-13 | 1994-04-14 | Escher Wyss Ag | Regelanordnung für ein Quarto-Metallwalzwerk |
DE3117398A1 (de) * | 1981-05-02 | 1982-11-18 | Escher Wyss AG, Zürich | "anordnung mit einer durchbiegungseinstellwalze und zugehoerigem regler" |
US4428244A (en) * | 1981-11-20 | 1984-01-31 | Sumitomo Light Metal Industries, Ltd. | Apparatus for measuring internal stress of strip during rolling process |
DE3410136C2 (de) * | 1984-03-20 | 1987-04-30 | Küsters, Eduard, 4150 Krefeld | Regeleinrichtung für die Liniendruckverteilung in Walzenanordnungen für Druckbehandlung von Warenbahnen |
-
1987
- 1987-10-31 DE DE19873736999 patent/DE3736999A1/de active Granted
-
1988
- 1988-10-27 US US07/263,424 patent/US4938045A/en not_active Expired - Lifetime
- 1988-10-27 EP EP19880117879 patent/EP0315043A3/fr not_active Withdrawn
- 1988-10-28 KR KR1019880014113A patent/KR960007622B1/ko not_active IP Right Cessation
- 1988-10-28 DK DK601588A patent/DK601588A/da not_active Application Discontinuation
- 1988-10-28 CA CA000581552A patent/CA1321492C/fr not_active Expired - Fee Related
- 1988-10-31 JP JP63273391A patent/JP2726066B2/ja not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60121050A (ja) * | 1983-12-05 | 1985-06-28 | Mitsubishi Heavy Ind Ltd | ドラム式連続鋳造機のドラム |
DE8517055U1 (de) * | 1985-06-07 | 1986-10-02 | Lechler, Gerhard, Dr.-Ing., 1000 Berlin | Walze |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, Band 9, Nr. 275 (M-426)[1998], 2. November 1985, Seite 161 M 426; & JP-A-60 121 050 (MITSUBISHI JUKOGYO K.K.) 28-06-1985 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4210495C1 (fr) * | 1992-03-31 | 1993-04-15 | Ibvt Ingenieurbuero Fuer Verfahrenstechnik Gmbh, 4000 Duesseldorf, De | |
WO2003061865A1 (fr) * | 2002-01-22 | 2003-07-31 | Bfi Vdeh - Institut Für Angewandte Forschung Gmbh | Rouleau plein permettant de déterminer les écarts de planéité |
EP1452246A2 (fr) * | 2003-02-27 | 2004-09-01 | ACHENBACH BUSCHHÜTTEN GmbH | Dispositif pour la mésure des deformations dépendant de la charge des cylindres logés dans des cages de laminoir des bandes métalliques |
EP1452246A3 (fr) * | 2003-02-27 | 2006-01-25 | ACHENBACH BUSCHHÜTTEN GmbH | Dispositif pour la mésure des deformations dépendant de la charge des cylindres logés dans des cages de laminoir des bandes métalliques |
EP1619488A3 (fr) * | 2004-07-23 | 2013-05-15 | Nagano Keiki Co., Ltd. | Capteur de pression |
DE102016008429A1 (de) | 2016-07-11 | 2018-01-11 | Vdeh-Betriebsforschungsinstitut Gmbh | Vorrichtung zum Ermitteln einer Kraft in einem einen Spalt mit einem Gegenkörper ausbildenden Walzkörper und Verfahren zum Ermitteln einer Kraft in einem einen Spalt mit einem Gegenkörper ausbildenden Walzkörper |
CN112077156A (zh) * | 2020-08-20 | 2020-12-15 | 燕山大学 | 一种冷轧带材板形辊挠度干扰信号消除方法 |
CN112077156B (zh) * | 2020-08-20 | 2021-05-14 | 燕山大学 | 一种冷轧带材板形辊挠度干扰信号消除方法 |
Also Published As
Publication number | Publication date |
---|---|
JPH01150410A (ja) | 1989-06-13 |
DE3736999C2 (fr) | 1989-09-28 |
DK601588A (da) | 1989-05-01 |
KR890007064A (ko) | 1989-06-17 |
EP0315043A3 (fr) | 1990-10-03 |
JP2726066B2 (ja) | 1998-03-11 |
DK601588D0 (da) | 1988-10-28 |
DE3736999A1 (de) | 1989-06-01 |
KR960007622B1 (ko) | 1996-06-07 |
CA1321492C (fr) | 1993-08-24 |
US4938045A (en) | 1990-07-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE3736999C2 (fr) | ||
DE2630410C2 (fr) | ||
EP3947233B1 (fr) | Détermination de l'état d'un moyen de transport | |
EP1923684B1 (fr) | Dispositif destiné à la mesure d'une force de traction à l'intérieur d'une nappe de tissu ou d'un écheveau de fil | |
EP3936249A1 (fr) | Rouleau de mesure pour déterminer une propriété d'un produit en forme de bande guidé sur le rouleau de mesure | |
EP3781332B1 (fr) | Procédé pour déterminer une propriété d'un produit en forme de bande guidé sur un rouleau de mesure | |
DE2920886C2 (de) | Verfahren und Vorrichtung zum Bestimmen von Verschiebungen im Boden, im Fels, in Bauwerken und dergleichen | |
DE2124112A1 (de) | Hohlzylindrischer Meßgrößenumformer mit Beanspru chungsmeßeinrichtungen | |
DE1527645A1 (de) | Regeleinrichtung und Anordnung zum Walzen von Baendern | |
EP0475085B1 (fr) | Procédé de mesure pour déterminer l'élongation de rupture d'un échantillon sous tension pendant un essai de tension contrôlé par ordinateur | |
DE2505560C3 (fr) | ||
DE10215929A1 (de) | Wälzlager mit Sensoren | |
DE2952232A1 (de) | Messvorrichtung zur erfassung des spaltes eines arbeitswalzenpaares | |
DE4135614A1 (de) | Vorrichtung zur messung der spannungsverteilung ueber die breite von biegsamen baendern, insbesondere von stahlbaendern beim kaltwalzen | |
DE102021209714A1 (de) | Vorrichtung und Verfahren zum Walzen von metallischem Band | |
DE102005023270A1 (de) | Verfahren und Vorrichtung zur Herstellung eines Metallbandes | |
DE102017104974A1 (de) | Messeinrichtung | |
DE102004014246A1 (de) | Verfahren und Anordnung zur Ermittlung belastungsabhängiger Tragwerksverformungen | |
DE4220544A1 (de) | Verfahren zum Messen mechanischer Spannungskomponenten an der Oberfläche von dynamisch belasteten Meßobjekten | |
DE3520929C1 (de) | Walze | |
EP1452246B1 (fr) | Dispositif pour la mésure des deformations dépendant de la charge des cylindres logés dans des cages de laminoir des bandes métalliques | |
DE102022125376A1 (de) | Messrolle zum Messen eines Bandzugs, Vorrichtung und Verfahren | |
DE4417023C2 (de) | Einrichtung zur Messung der Bahnspannung einer kontinuierlich bewegten Stoffbahn | |
DE19605492A1 (de) | Meßvorrichtung sowie Verfahren zur Überprüfung der Qualität von Verseilmaschinen | |
DE3110627A1 (de) | Vorrichtung und verfahren zur erhoehung der lebensdauer von ofenwandauskleidungen von drehoefen in der zementindustrie sowie mit einer solchen vorrichtung ausgeruesteter drehofen |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19901102 |
|
17Q | First examination report despatched |
Effective date: 19920617 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19930724 |