EP0577628B1 - Proportionale elektronisch-mechanische betaetigungseinrichtung - Google Patents

Proportionale elektronisch-mechanische betaetigungseinrichtung Download PDF

Info

Publication number
EP0577628B1
EP0577628B1 EP92906082A EP92906082A EP0577628B1 EP 0577628 B1 EP0577628 B1 EP 0577628B1 EP 92906082 A EP92906082 A EP 92906082A EP 92906082 A EP92906082 A EP 92906082A EP 0577628 B1 EP0577628 B1 EP 0577628B1
Authority
EP
European Patent Office
Prior art keywords
positioner
pilot control
spindle
actuator
actuator means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92906082A
Other languages
English (en)
French (fr)
Other versions
EP0577628A1 (de
Inventor
Ilkka Ahonoja
Markku Luomaranta
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.)
NESTEPAINE Oy AB
Original Assignee
NESTEPAINE Oy AB
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 NESTEPAINE Oy AB filed Critical NESTEPAINE Oy AB
Publication of EP0577628A1 publication Critical patent/EP0577628A1/de
Application granted granted Critical
Publication of EP0577628B1 publication Critical patent/EP0577628B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/202—Externally-operated valves mounted in or on the actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/28—Means for indicating the position, e.g. end of stroke
    • F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
    • F15B15/2861—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT using magnetic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B2013/0409—Position sensing or feedback of the valve member

Definitions

  • the invention relates to a proportional mechano-electronic actuator means linearly controllable by a pressure fluid, the actuator means being intended to be connected to a pressure source and to a device to be controlled, comprising a proportional magnet; a pilot control spindle arranged movable in a pilot control body by means of a proportional magnet for opening and closing different pressure fluid conduits; a positioner means for the device to be controlled, the positioner means being linearly controllable in two directions by means of the pilot control spindle so that the pilot control spindle tends to keep the positioner means at each particular moment in a predetermined position corresponding to a control signal supplied by an electric control unit of the actuator means so as to linearly control the device to be controlled through a coupling spindle or other similar external coupling device of the actuator means.
  • a device of this type is known e.g. from EP Patent Specification 0 151 174, in which a pilot control spindle and a positioner are in mechanical contact with each other, the determination of the position of the positioner being inaccurate and its response relatively slow.
  • the object of the present invention is to eliminate the drawbacks of the prior art. This object is achieved by means of an actuator means according to the invention, which is characterized in that a position sensor electrically sensing the position of the positioner means is provided in a substantially cylindrical means defining a space where the positioner means moves, the position sensor comprising a winding fitted around said means.
  • the valve according to the invention is connectable to any valve, and it is especially well suited for the control of a mobile directional valve, for instance.
  • Figures 1a, 2a, 3a and 4a show side views of the actuator means according to the invention in a partial section in different operating positions, the actuator means of Figure 4a deviating slightly from the actuator means of Figures 1a, 2a and 3a with respect to the arrangement of the position sensor; and
  • Figures 1b, 2b, 3b and 4b show pressure line coverage patterns associated with the operating positions shown in the above-mentioned figures.
  • Figures 1a, 2b and 3a show a proportional mechano-electronic actuator means comprising a proportional magnet 1, a pilot control unit 30, a positioner unit 40, a feed and return part 50 for pressure fluid, and an electronic unit 70, which are all connected fixedly together into a compact actuator means aggregate.
  • the pilot control unit 30 comprises a body 5 provided with a cylindrical boring 6 in which a vertically movable pilot control spindle 3 is positioned.
  • the spindle 3 comprises an upper annular shoulder 7, a lower annular shoulder 8 and an annular conduit 9 positioned therebetween.
  • a spring 4 is provided in the boring 6 below the pilot control spindle 3, a spindle 2 of the proportional magnet 1 moving the pilot control spindle 3 against the tension of the spring 4.
  • the body 5 further comprises a pressure fluid conduit P and a pressure fluid return conduit T communicating with the pressure fluid feed and return part 50.
  • the feed and return part 50 is positioned immediately below the pilot control unit 30.
  • the positioner unit 40 comprises a housing 10 which is attached to the side of the pilot control unit 30.
  • a rotation symmetrical cavity extends through the housing 10, and a cylinder pipe 12 of a non-magnetic material is secured in one end of the cavity within the cavity close to the pilot control unit 30.
  • a copper wire winding or coil 13 is embedded in the outer surface of the cylinder pipe 12 so as to extend around the pipe, and a positioner means 11 is arranged slideably against the inner surface of the cylinder pipe 12 in a sealed manner.
  • a coupling spindle 14 is attached to the end of the positioner means remote from the pilot control unit 30 for controlling a valve 60 attached to this end of the positioner unit 40.
  • a spring assembly 15 to 18 is installed within the corresponding end portion of the cavity of the housing 10; the spring assembly tends to center the positioner means 11 when the means is moved in either direction.
  • the housing 10 is attached to the side of the pilot control body 5 so that the axes of the pilot control spindle 3 and the positioner means 11 are perpendicular to each other.
  • the pressure space A1 communicates with the boring 6 of the pilot control unit 30 by means of a conduit A extending through the body 5, and the pressure space B1 by means of a conduit B extending through the housing 10 and the body 5.
  • the pressure space B1 is sealed by a seal 19 in the area of the housing 10 where the spring assembly 15 to 18 is positioned.
  • the coil 13 and the means 11 are so positioned with respect to each other that the length of the portion of the means 11 remaining within the coil 13 varies with the position of the means 11.
  • a certain length of the means 11 penetrated within the coil 13 corresponds to each position of the means 11.
  • the means 11 is made of a material in which eddy currents are liable to occur, the inductance of the coil 13 varies continuously as a function of the position.
  • the intensity of the created eddy currents - and thus the sensitivity of the sensor arrangement - can be affected e.g. by controlling the force line pattern of the magnetic field of the coil 13 and increasing the intensity of the force lines in a desired manner.
  • the inductance of the coil 13 at each specific moment - and thus the position of the means 11 - is measured and converted into a pulse-length-modulated signal by means of a microprocessor.
  • the actuator means shown in Figure 4a corresponds to the actuator means shown in Figures 1a, 2a and 3a with the exception of the arrangement of the position sensor.
  • the position sensor 130 is wound on a spool 131 which is pushed over a cylinder pipe 120. This is another advantageous way of installing the position sensor around the cylinder pipe. The operating principle of the actuator means and the position sensor is not affected by this modification.
  • the actuator means aggregate operates as follows:
  • Figure 1a illustrates the rest state of the actuator means.
  • the return spring 4 keeps the pilot control spindle 3 and the spindle 2 of the magnet 1 in the upper extreme position, a so-called safety position ( Figure 1b).
  • the shoulder 8 of the pilot control spindle 3 keeps the pressure fluid conduit P closed, whereas the conduit A and the conduit B communicate with the return fluid conduit T.
  • the positioner means 11 is maintained in its center position by the action of the centering spring 15, and it may be moved mechanically by an external force.
  • Figures 2a, 3a and 4b the actuator means is shown in an operation state.
  • current is supplied to the magnet 1 so that the magnet pushes the pilot control spindle 3 to a so-called center position ( Figure 3b), in which the shoulder 7 prevents the flow between the conduit A and the return conduit T while allowing the flow between the pressure fluid conduit P and the conduit B.
  • the position is sensed as described above by means of a signal processed by the means 11 and the microprocessor.
  • the pilot control spindle 3 remains in this position to wait for the control signal, and it may move either downward (Figure 4b) or upward (Figure 2b), depending on the difference between the external control signal and the control signal supplied by the positioner means 11.
  • the pressure fluid conduit P is connected to the conduits A and B when the pilot control spindle 3 moves upward due to the difference between the external control signal and the position signal supplied by the positioner means 11.
  • the shoulder 7 keeps the return fluid conduit T closed ( Figure 2b).
  • the positioner means 11 moves to the right due to the difference between the areas of the pressure spaces A1 and B1 until the signal supplied by the coil 13 corresponds to the control signal in magnitude, so that the pilot control spindle 3 returns to the center position ( Figure 3b).
  • the positioner means 11 remains in this new position as long as the control signal proportional to this position is maintained.
  • the signal difference caused by the termination of the control signal displaces the pilot control spindle 3 from the center position ( Figure 3b) to the position shown in Figure 4a, so that the pressure fluid conduit P is connected to the conduit B and the return conduit T to the conduit A.
  • the positioner means 11 moves to the left, until the signal supplied by the coil 13 corresponds to the signal of the center position in magnitude, and so the pilot control spindle 3 returns to the center position ( Figure 3b).
  • the signal difference caused by the termination of the control signal displaces the pilot control spindle 3 from the center position ( Figure 3b) to the position shown in Figure 2a, so that the pressure fluid conduit P is connected to the conduits A and B.
  • the shoulder 7 keeps the return conduit T closed.
  • the positioner means 11 moves to the right due to the difference between the areas of the pressure spaces A1 and B1 until the signal supplied by the coil 13 corresponds to the signal of the center position in magnitude, and the pilot control spindle 3 returns to the center position ( Figure 3b).
  • the actuator means it operates in a volume flow controlled manner, so that when it is connected to a pressure source, its pressure is constantly the same as that of the pressure source. In other words, the entire pressure of the pressure source can immediately be used to move the positioner means 11 when the control is started.
  • the volume flow control is compared with the pressure control acting against the spring, a considerable functional advantage is obtained. It is typical of a pressure-controlled device that the control pressure required to obtain a certain initial control position may be e.g. one fourth of the required final pressure (initial pressure e.g. 6 bar, final pressure 25 bar); as is well-known, this causes operational disturbances and even prevents the operation of the device due to viscosity problems when cold oil is employed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Position Or Direction (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Valve Device For Special Equipments (AREA)
  • Fluid-Damping Devices (AREA)
  • Vehicle Body Suspensions (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Actuator (AREA)
  • Networks Using Active Elements (AREA)
  • Fluid-Pressure Circuits (AREA)

Claims (5)

  1. Proportionales mechanoelektronisches Stellglied, das durch ein Druckfluid linear gesteuert werden kann, wobei das Stellglied dazu bestimmt ist, mit einer Druckquelle (P) und mit einer zu steuernden Vorrichtung (60) verbunden zu werden, aufweisend:
    - einen Proportionalmagneten (1);
    - eine Vorsteuerspindel (3), die beweglich in einem Vorsteuergehäuse (5) angeordnet ist, und zwar mittels des Proportionalmagneten (1) zum Öffnen und Schließen verschiedener Druckfluidleitungen (A, B, P, T);
    - eine Positioniereinrichtung (11) für die zu steuernde Vorrichtung (60), wobei die Positioniereinrichtung (11) mittels der Vorsteuerspindel (3) in zwei Richtungen linear gesteuert werden kann, so daß die Vorsteuerspindel (3) anstrebt, die Positioniereinrichtung (11) zu jedem speziellen Zeitpunkt in einer vorbestimmten Position zu halten, und zwar entsprechend einem Steuersignal, das von einer elektrischen Steuereinheit (70) des Stellglieds zugeführt wird, um so die zu steuernde Vorrichtung (60) linear über eine Spindel (14) oder eine andere ähnliche externe Koppeleinrichtung des Stellglieds zu steuern,
    dadurch gekennzeichnet, daß
    ein Positionssensor (13; 130), der die Position der Positioniereinrichtung (11) elektrisch abtastet, in einer im wesentlichen zylindrischen Einrichtung (12; 120) vorgesehen ist, die einen Raum begrenzt, in dem sich die Positioniereinrichtung (11) bewegt, wobei der Positionssensor eine Wicklung aufweist, die um die zylindrische Einrichtung (12; 120) herumgelegt ist.
  2. Stellglied nach Anspruch 1, dadurch gekennzeichnet, daß der Positionssensor (13) in die äußere Oberfläche der um die Positioniereinrichtung (11) herum angeordneten Zylinderröhre (12) eingebettet ist.
  3. Stellglied nach Anspruch 2, dadurch gekennzeichnet, daß der Positionssensor (130) auf einen Spulenkörper (131) gewickelt ist, der auf die Zylinderröhre (120) aufgeschoben ist.
  4. Stellglied nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Zylinderröhre (12; 120) aus einem unmagnetischen Material besteht.
  5. Stellglied nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß ein Gehäuse (10) der Positioniereinrichtung (11) mit der Seite des Vorsteuergehäuses (5) verbunden ist, so daß die Achsen der Vorsteuerspindel (3) und die Positioniereinrichtung (11) im wesentlichen rechtwinklig zueinander angeordnet sind, und daß der Hohlraum, der durch die Zylinderröhre (12; 120) begrenzt ist, Druckräume (A¹, B¹) aufweist, die auf die Vorder- und Rückseite der Positioniereinrichtung (11) wirken, wobei die Druckräume über eine einzige Druckfluidleitung (A, B) mit einem Raum in Verbindung stehen, in dem sich die Vorsteuerspindel (3) bewegt und der mit der Druckquelle (P) in Verbindung steht.
EP92906082A 1991-03-13 1992-03-11 Proportionale elektronisch-mechanische betaetigungseinrichtung Expired - Lifetime EP0577628B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI911256 1991-03-13
FI911256A FI90374C (fi) 1991-03-13 1991-03-13 Proportionaalinen mekatroninen toimilaite
PCT/FI1992/000067 WO1992016756A1 (en) 1991-03-13 1992-03-11 Proportional mechano-electronic actuator means

Publications (2)

Publication Number Publication Date
EP0577628A1 EP0577628A1 (de) 1994-01-12
EP0577628B1 true EP0577628B1 (de) 1995-12-06

Family

ID=8532114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92906082A Expired - Lifetime EP0577628B1 (de) 1991-03-13 1992-03-11 Proportionale elektronisch-mechanische betaetigungseinrichtung

Country Status (6)

Country Link
EP (1) EP0577628B1 (de)
AT (1) ATE131256T1 (de)
AU (1) AU1342692A (de)
DE (1) DE69206610T2 (de)
FI (1) FI90374C (de)
WO (1) WO1992016756A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0886380A (ja) * 1994-09-13 1996-04-02 Smc Corp パイロット形弁
JP3468457B2 (ja) * 1999-07-14 2003-11-17 Ｓｍｃ株式会社 位置検出機能付き切換弁
JP3696075B2 (ja) * 2000-10-06 2005-09-14 Ｓｍｃ株式会社 磁気センサー付き切換弁
CN110173478B (zh) * 2019-06-05 2020-05-05 浙江厚达智能科技股份有限公司 中药生产用驱动机构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2674232A (en) * 1952-05-28 1954-04-06 Bendix Aviat Corp Latching mechanism
US3136224A (en) * 1960-11-04 1964-06-09 North American Aviation Inc Dual flow-synchronized electrohydraulic servo
US3279323A (en) * 1964-09-28 1966-10-18 North American Aviation Inc Electrohydraulic actuator
DE2904573C2 (de) * 1979-02-07 1983-01-27 Mannesmann Rexroth GmbH, 8770 Lohr Von einem regelbaren Elektromagneten betätigtes hydraulisches Ventil
US4569273A (en) * 1983-07-18 1986-02-11 Dynex/Rivett Inc. Three-way proportional valve
CH675752A5 (de) * 1988-10-25 1990-10-31 Sulzer Ag

Also Published As

Publication number Publication date
FI911256A0 (fi) 1991-03-13
FI90374B (fi) 1993-10-15
ATE131256T1 (de) 1995-12-15
FI90374C (fi) 1994-01-25
WO1992016756A1 (en) 1992-10-01
DE69206610D1 (de) 1996-01-18
DE69206610T2 (de) 1996-05-23
EP0577628A1 (de) 1994-01-12
AU1342692A (en) 1992-10-21
FI911256A (fi) 1992-09-14

Similar Documents

Publication Publication Date Title
US6918472B2 (en) Arrangement for a piston and cylinder device
JP4656540B2 (ja) 圧力センサを内蔵する電磁圧力制御弁装置
EP0186167B1 (de) Elektromagnetisches Strömungsregelungsventil
EP1069322B1 (de) Wegeventil mit Positionsermittlung
US5293900A (en) Joystick with contactless direct drive device
EP2018499B1 (de) Verschiebungsmesser
CA2347610C (en) Solenoid operated pressure control valve
EP0066150B1 (de) Servogesteuertes Wegeventil mit variabeler Verstärkung
US4771804A (en) Liquid level sensing and control assembly
CA2635740A1 (en) Wireless position feedback device and system
US4613352A (en) Displacement pick-up arrangement for the position detection of a pressing plunger
JP4704338B2 (ja) 電磁制御可能なアクチュエータを製造及び／又は調整する方法と装置
EP0577628B1 (de) Proportionale elektronisch-mechanische betaetigungseinrichtung
US4669568A (en) Regulated device for controlling pressure in a hydraulic installation, particularly for the assisted steering of a vehicle
JPS59220602A (ja) 調節機構の位置を検出するための距離発信装置
US5609183A (en) Butterfly valve with sensing coil
EP0233166A2 (de) Zusammengebauter Elektromagnet und Druckgeber
EP0139300B1 (de) Elektromagnet
US6237624B1 (en) Seat valve
CA1156908A (en) Power transmission
KR20020084820A (ko) 압력 제어 밸브 조립체 및 압력 제어 밸브의 작동 방법
GB2253721A (en) Pressure control valve
US6953057B2 (en) Automatic transmission shift control solenoid and valve
EP0177150B1 (de) Elektropneumatischer Wandler
EP0908654B1 (de) Durchflussregelndes Magnetventil

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

17P Request for examination filed

Effective date: 19930917

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE

17Q First examination report despatched

Effective date: 19950202

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19951206

Ref country code: LI

Effective date: 19951206

Ref country code: FR

Effective date: 19951206

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19951206

Ref country code: DK

Effective date: 19951206

Ref country code: CH

Effective date: 19951206

Ref country code: BE

Effective date: 19951206

REF Corresponds to:

Ref document number: 131256

Country of ref document: AT

Date of ref document: 19951215

Kind code of ref document: T

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 69206610

Country of ref document: DE

Date of ref document: 19960118

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19960311

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19960320

Year of fee payment: 5

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19960322

Year of fee payment: 5

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
EN Fr: translation not filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19960531

Year of fee payment: 5

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19970311

Ref country code: AT

Effective date: 19970311

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19970312

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19970311

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19971202

EUG Se: european patent has lapsed

Ref document number: 92906082.0

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050311