EP0589404B1 - Procédé et dispositif pour commander un courant de gaz - Google Patents

Procédé et dispositif pour commander un courant de gaz Download PDF

Info

Publication number
EP0589404B1
EP0589404B1 EP93115152A EP93115152A EP0589404B1 EP 0589404 B1 EP0589404 B1 EP 0589404B1 EP 93115152 A EP93115152 A EP 93115152A EP 93115152 A EP93115152 A EP 93115152A EP 0589404 B1 EP0589404 B1 EP 0589404B1
Authority
EP
European Patent Office
Prior art keywords
pressure
control pressure
actuator
line
gas
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
EP93115152A
Other languages
German (de)
English (en)
Other versions
EP0589404A1 (fr
Inventor
Gilbert Spiesser
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.)
Elster Kromschroeder GmbH
Original Assignee
G Kromschroeder AG
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 G Kromschroeder AG filed Critical G Kromschroeder AG
Publication of EP0589404A1 publication Critical patent/EP0589404A1/fr
Application granted granted Critical
Publication of EP0589404B1 publication Critical patent/EP0589404B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/027—Regulating fuel supply conjointly with air supply using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N5/188—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
    • F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F23N2233/08—Ventilators at the air intake with variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/20—Membrane valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/24—Valve details

Definitions

  • the invention relates to a method and a device for controlling a gas flow, in which an actuator operating in the gas flow is actuated as a function of a control pressure.
  • the actuator changes the free flow cross-section for the gas flow as a linear function of a control pressure.
  • Such a method is used, for example, to keep the gas / air ratio constant in a gas consumption device with a premixing burner.
  • the combustion air is fed to such gas consumption devices by means of a fan.
  • the air pressure serves as a control pressure for a gas pressure regulating device which actuates the actuator in the gas stream.
  • the gas / air mixture must be kept constant over the entire adjustment range of the burner. Since the gas pressure constantly tracks the air pressure, the actuator releases a corresponding gas flow even when the air pressure is very low. This is problematic when the gas consuming device is switched off. For safety reasons, the burner must go out with excess air. This is to prevent incomplete combustion, which would result in the formation of highly toxic carbon monoxide and soot in the exhaust gas. A sufficient excess of air during the switch-off process can only be achieved with an overall high excess of air. The result is poor combustion efficiency.
  • the invention is therefore based on the object to provide a remedy here and to provide a simple way of controlling a gas flow in such a way that the gas flow is shut off in a simple and safe manner when the control pressure falls below a target pressure.
  • the method according to the invention is characterized in that the control pressure is compared with a setpoint pressure and that the action of the control pressure on the actuator is switched off when the control pressure falls below the setpoint.
  • the method makes it possible, for example, to change the output in modulatingly regulated gas consumption devices with air premixing by changing the air volume flow.
  • the linearity of the control the gas flow interrupted depending on the control pressure.
  • the effect of the control pressure goes to zero and the actuator shuts off the gas flow, so that there is a lack of gas or excess air in the switched-off state. This prevents incomplete combustion conditions.
  • the invention further provides a device for controlling a gas flow with an actuator arranged in a gas line and with a control pressure line which is operatively connected to the actuator, which is characterized in that the control pressure line is connected to a pressure switch, that the pressure switch controls the control pressure compares the target pressure and that the pressure switch switches off the action of the control pressure on the actuator when the control pressure falls below the target pressure.
  • An advantageous embodiment is characterized in that the pressure switch in a housing has a comparison membrane which is acted upon on the one hand by the control pressure and on the other hand by the set pressure and that the comparison membrane actuates a closure body of a valve in the control pressure line.
  • the comparison membrane actuates the closure body in the opening direction of the valve. As a result, the action of the control pressure on the actuator is switched off.
  • valve is arranged in a partition in the housing, that the partition delimits a chamber to which a control pressure branch line is connected and that a space is formed in the housing between the partition and the comparison membrane to which one Outflow line is connectable.
  • control pressure line contains a throttle point.
  • the valve When the valve is open, there is a strong pressure drop in the control pressure line as a result of the throttle point, so that the control pressure quickly goes to zero.
  • a reference value spring which acts in the opening direction of the closure body, advantageously engages the comparison membrane.
  • the setpoint spring can be designed as a tension spring.
  • the setpoint spring is designed as a compression spring. Two compression springs act against each other with different spring forces. The difference between the two pressures represents the target pressure.
  • the force of the setpoint spring is adjustable via a setpoint adjuster.
  • the closure body is advantageously fastened to a prestressed spring element.
  • the comparison membrane acts on the spring element via an actuating rod.
  • the preloaded spring element forms a snap mechanism, which ensures that the valve is either fully open or securely closed. With only minimal movements of the comparison membrane, undefined states of the valve are not possible.
  • the actuator is advantageously actuated by a gas / air ratio regulator which is acted upon by the control pressure in the opening direction of the actuator, the control pressure line being connected to an air duct.
  • a measuring orifice is preferably arranged in the air duct and the control pressure line is connected to the air duct upstream of the measuring orifice. Downstream of the orifice there is a differential pressure line which is connected on the one hand to the ratio regulator and on the other hand to the space of the pressure switch between the partition and the comparison membrane.
  • FIG. 1 shows a gas consumption device 1 of known construction to which a gas line 2 and an air duct 3 lead.
  • the combustion air is fed to the burner 4 by means of a fan 5.
  • An actuator 6 is arranged in the gas line 2.
  • the actuator 6 is actuated by a gas / air ratio controller 7, the type of which is also known.
  • a control pressure is applied to a first diaphragm 8 in the opening direction of the actuator.
  • the gas pressure is applied to a second membrane 9 via a pulse line 10, in the closing direction of the actuator 6.
  • the gas / air ratio regulator 7 is operatively connected to a pressure switch 13 via a control pressure line 11 in which a throttle point 12 is located.
  • the pressure switch 13 has a housing 14 in which a control pressure chamber 16 is delimited by a comparison membrane 15.
  • the comparison membrane 15 is acted upon by the force of a setpoint spring 17, the spring force of which can be adjusted via a setpoint adjuster 18.
  • the comparison membrane 15 actuates a closure body 19 which interacts with a valve 20 in a partition 21.
  • the partition wall 21 delimits a chamber 22 to which a control pressure branch line 23 is connected, which branches downstream from the throttle point 12 from the control pressure line 11.
  • a measuring orifice 24 is located in the air duct 3. As is known, the differential pressure across the measuring orifice corresponds to the air flow.
  • differential pressure line 25 Downstream of the measuring orifice 24 there is a differential pressure line 25 (minus pressure) which leads on the one hand to the ratio regulator 7 and on the other hand is connected to the space 27 of the pressure switch 13 which is formed between the partition 21 and the comparison membrane 15.
  • the setpoint spring 17 is a tension spring, the spring force of which acts on the closure body 19 in the opening direction.
  • the differential pressure across the measuring orifice 24 in the air duct 3 acts on the comparison diaphragm 15 via the control pressure line 11 and the differential pressure line 25.
  • the control pressure which acts on the first diaphragm 8 of the ratio regulator 7, is identical to the differential pressure across the measuring orifice 24 in the air duct 3.
  • the gas pressure in the gas line 2 is tracked to the differential pressure of the air in the air duct 3, a ratio which has been set once being constant remains.
  • the pressure in the chamber 22 drops to the pressure level in the differential pressure line 25, and there is a flow in the control gas line 11 and the control gas branch line 23.
  • the throttle point 12 generates a large pressure loss, so that the control pressure, which in this case is the plus Pressure corresponds to the orifice measurement in the air duct 3, practically drops to the value of the minus pressure in the differential pressure line 25.
  • the device is intrinsically safe. If the air supply is disrupted, for example due to a clogged filter in the air duct 3, the actuator 6 automatically closes the gas supply to the gas consumption device.
  • Fig. 2 shows a further embodiment of the pressure switch 13. If the control pressure is higher than the target pressure, the closure body 19 securely closes the valve 20 in the form of a plate.
  • the target value spring 17 is in this case a compression spring, the force of which can be changed via the target value adjuster 18 is.
  • a compression spring 26 acts counter to the setpoint spring. The target pressure results from the difference in spring forces.
  • the closure body 19 is fastened to a prestressed spring element 27 '.
  • the spring element 27 ' is connected to the comparison membrane 15 via a rod 28.
  • a snap spring mechanism is formed which securely closes and opens the closure body 19 without undefined conditions being able to occur.
  • control pressure p b downstream of the pressure switch in the control pressure line 11 as a function of the control pressure p u upstream of the pressure switch. If the pressure falls below a certain target pressure p s , the control pressure p b approaches zero.
  • the pressure switch can also be built directly into a pressure regulator or a gas / air ratio regulator.
  • the control pressure can also act directly on an actuator in the form of a spool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Flow Control (AREA)
  • Control Of Fluid Pressure (AREA)

Claims (12)

  1. Procédé pour commander un courant de gaz où un organe de réglage (6) disposé dans le courant de gaz est actionné en fonction d'une pression de commande, caractérisé par le fait que la pression de commande est comparée avec une pression de consigne et que l'effet de la pression de commande exercé sur l'organe de réglage (6) est supprimé lorsque la pression de commande passe en dessous de la pression de consigne.
  2. Dispositif pour commander un courant de gaz avec un organe de réglage (6) disposé dans une conduite de gaz (2) et avec une conduite de pression de commande (11) étant en liaison d'actionnement avec l'organe de réglage (6), caractérisé par le fait que la conduite de pression de commande (11) est raccordée à un contacteur manométrique (13), que le contacteur manométrique (13) compare la pression de commande avec une pression de consigne et que le contacteur manométrique (13) supprime l'effet de la pression de commande exercé sur l'organe de réglage (6) lorsque la pression de commande passe en dessous de la pression de consigne.
  3. Dispositif selon la revendication 2, caractérisé par le fait que le contacteur manométrique (13) présente, dans un carter (14), un diaphragme de comparaison (15) qui est soumis, d'une part, à la pression de commande et, d'autre part, à la pression de consigne, et que le diaphragme de comparaison (15) actionne sur un obturateur (19) d'une vanne (20) étant disposée dans la liaison avec la conduite de pression de commande (11).
  4. Dispositif selon la revendication 2, caractérisé par le fait que la vanne (20) est disposée dans une paroi de séparation (21) dans le carter (14), que la paroi de séparation délimite une chambre (22) à laquelle est raccordé un piquage (23) de pression de commande, et que dans le carter (14) est formé, entre la paroi de séparation (21) et le diaphragme de comparaison (15), un espace (27) auquel est raccordé une conduite d'évent (25).
  5. Dispositif selon l'une des revendications 3 ou 4, caractérisé par le fait que la conduite de pression de commande (11) contient un dispositif d'étranglement (12).
  6. Dispositif selon l'une des revendications 3 à 5, caractérisé par le fait qu'au niveau du diaphragme de comparaison (15) prend un ressort de consigne (17) qui exerce son effet en direction d'ouverture de l'obturateur (19).
  7. Dispositif selon la revendication 6, caractérisé par le fait que le ressort de consigne (17) est conçu sous forme de ressort à pression.
  8. Dispositif selon la revendication 7, caractérisé par le fait que la force du ressort de consigne (17) est réglable à l'aide d'un régulateur de valeur de consigne (18).
  9. Dispositif selon l'une des revendications 3 à 8, caractérisé par le fait que l'obturateur (19) est fixé à un élément de ressort prétendu (27') et que le diaphragme de comparaison (15) exerce de l'effet sur l'élément de ressort (27') à l'aide d'une tige d'actionnement (28).
  10. Dispositif selon l'une des revendications 2 à 9, caractérisé par le fait que l'organe de réglage est actionné par un régulateur du rapport gaz/air (7) incité par la pression de commande en direction d'ouverture de l'organe de réglage (6), et que la conduite de pression de commande (11) est raccordée à un canal d'air (3).
  11. Dispositif selon la revendication 10, caractérisé par le fait qu'un diaphragme de mesure (24) est disposé dans le canal d'air (3) et que la conduite de pression de commande (11) est raccordée, en amont du diaphragme de mesure (24), audit canal d'air (3), et que, en aval du diaphragme de mesure (24), part une conduite de pression différentielle (25) qui est raccordée, d'une part, au régulateur du rapport gaz/air (7) et, d'autre part, à l'espace (27) du contacteur manométrique (13) entre la paroi de séparation (21) et le diaphragme de comparaison (15).
  12. Dispositif selon la revendication 10, caractérisé par le fait que le contacteur manométrique (13) est intégré dans le régulateur du rapport gaz/air (7).
EP93115152A 1992-09-21 1993-09-21 Procédé et dispositif pour commander un courant de gaz Expired - Lifetime EP0589404B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4231374A DE4231374A1 (de) 1992-09-21 1992-09-21 Verfahren und Vorrichtung zum Steuern eines Gasstromes
DE4231374 1992-09-21

Publications (2)

Publication Number Publication Date
EP0589404A1 EP0589404A1 (fr) 1994-03-30
EP0589404B1 true EP0589404B1 (fr) 1996-07-10

Family

ID=6468326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93115152A Expired - Lifetime EP0589404B1 (fr) 1992-09-21 1993-09-21 Procédé et dispositif pour commander un courant de gaz

Country Status (3)

Country Link
EP (1) EP0589404B1 (fr)
AT (1) ATE140312T1 (fr)
DE (2) DE4231374A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19537773C2 (de) * 1995-10-11 1999-07-29 Viessmann Werke Kg Verfahren und Vorrichtung zum Zünden eines Gasgebläsebrenners
CN102323004A (zh) * 2011-06-01 2012-01-18 合肥望远电子科技有限公司 一种开关量差压传感器

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE916702C (de) * 1950-07-06 1954-08-16 Rudolf Majert G M B H Gasdruckregler
GB1275660A (en) * 1969-12-09 1972-05-24 Westland Aircraft Ltd Improvements in or relating to pressure control systems
US3741710A (en) * 1971-12-20 1973-06-26 L Nelson Combustion control valve means and system
SU479092A1 (ru) * 1973-02-12 1975-07-30 Днепропетровский Ордена Трудового Красного Знамени Государственный Университет Им.300-Летия Воссоединения Украины И Россией Устройство дл регулировани давлени
DE2834242A1 (de) * 1978-08-04 1980-02-14 Kromschroeder Ag G Gemisch-regeleinrichtung fuer gasgeblaesebrenner
DE2908197C2 (de) * 1979-03-02 1985-08-22 Ruhrgas Ag, 4300 Essen Vorrichtung zum Konstanthalten des Mischungsverhältnisses von Gas und Verbrennungsluft bei Gebläsebrennern
DE2947216A1 (de) * 1979-11-23 1981-06-04 Regel + Meßtechnik GmbH Regler- und Anlagenbau für Gas-Druckregelung, 3500 Kassel Vorrichtung zum regeln des durchflusses stroemender medien
FR2544522B1 (fr) * 1983-04-14 1986-08-14 Zimmern Bernard Capteur de rapport de pression
AT388809B (de) * 1985-10-15 1989-09-11 Avl Verbrennungskraft Messtech Messanordnung, verfahren zum nullpunktabgleich des differenzdruckumformers in einer messanordnung sowie messblende fuer eine messanordnung zur durchflussmengenmessung von fluid-, vorzugsweise gasstroemen
DE3639710A1 (de) * 1986-11-20 1988-06-01 Pierburg Luftfahrtgeraete Verfahren zum regeln des differenzdruckes bei einem fluid-mess- und dosiergeraet sowie eine vorrichtung zum durchfuehren des verfahrens
CH676497A5 (en) * 1987-10-19 1991-01-31 Landis & Gyr Betriebs Ag Forced-draught gas-burner control - uses conduit pressure to regulate gas quantity
FR2639094B1 (fr) * 1988-11-16 1991-07-12 Chaffoteaux Et Maury Perfectionnements aux dispositifs pour commander et regler l'alimentation en gaz du bruleur d'une chaudiere ou analogue

Also Published As

Publication number Publication date
ATE140312T1 (de) 1996-07-15
DE59303188D1 (de) 1996-08-14
EP0589404A1 (fr) 1994-03-30
DE4231374A1 (de) 1994-03-24

Similar Documents

Publication Publication Date Title
DE1961438C3 (de) Drehzahlsteuerungseinrichtung für eine Kraftmaschine zur Steuerung der Leerlaufdrehzahl
EP0907052A2 (fr) Dispositif de commande de rapport pneumatique
DE1900688C3 (de) Strömungsmittel verwendendes System zur Steuerung des Druckes in einem geschlossenen Raum
EP0462583B1 (fr) Régulateur de pression de gaz commandé par une membrane
EP0589404B1 (fr) Procédé et dispositif pour commander un courant de gaz
EP0178420A1 (fr) Dispositif de réglage de la vitesse de ralenti
EP0707863A1 (fr) Dispositif de réglage de la proportion de gaz pour appareil d'anesthésie
DE2831733B2 (fr)
DE2044912C3 (de) Fluidische Regelanordnung
DE1600733B2 (de) Druckminderer
DE2723178C2 (de) Sicherheits- und Steuersystem für die Luftzufuhr zur Verbrennungskammer eines Gasbrenners mit Zwangsabzug
DE10232653B3 (de) Regeleinrichtung für Gasbrenner
DE10018757A1 (de) Gasarmatur zum Regeln des Druckes und zum Absperren eines Gasstromes
DE2834242A1 (de) Gemisch-regeleinrichtung fuer gasgeblaesebrenner
DE2947216A1 (de) Vorrichtung zum regeln des durchflusses stroemender medien
DE2805122C2 (de) Abgasrückführsystem für Brennkraftmaschine
DE3626782C1 (de) Vorrichtung zur Regulierung der Rahmkonzentration bei einer Zentrifuge zur Entrahmung von Milch
DE2415420B2 (de) Regelventil, insbesondere für Dampfturbinen
DE2509384C3 (de) Gasdruckregler
DE19849087C2 (de) Gasdruckregelgerät
DE2117905A1 (de) Brennstoffregelanlage fuer gasturbinentriebwerke
DE1600733C3 (de) Druckminderer
DE2843030C2 (fr)
DE1910439C (de) Regeleinrichtung fur die Zufuhr von flussigem und/oder gasförmigem Brenn stoff zu einer Gasturbinenanlage
DE869573C (de) Treibstoff-Regel- und -Steuereinrichtung, insbesondere fuer Gasturbinen

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: A1

Designated state(s): AT DE GB IT NL

17P Request for examination filed

Effective date: 19940608

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: G. KROMSCHROEDER AKTIENGESELLSCHAFT

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

17Q First examination report despatched

Effective date: 19951130

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE GB IT NL

REF Corresponds to:

Ref document number: 140312

Country of ref document: AT

Date of ref document: 19960715

Kind code of ref document: T

REF Corresponds to:

Ref document number: 59303188

Country of ref document: DE

Date of ref document: 19960814

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

Ref country code: AT

Payment date: 19960910

Year of fee payment: 4

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960819

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

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

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970921

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19970921

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 NON-PAYMENT OF DUE FEES

Effective date: 19980401

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

Effective date: 19970921

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19980401

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

Ref country code: DE

Payment date: 20020907

Year of fee payment: 10

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

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040401

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: 20050921