EP0344517B1 - Side channel compressor - Google Patents

Side channel compressor Download PDF

Info

Publication number
EP0344517B1
EP0344517B1 EP89108884A EP89108884A EP0344517B1 EP 0344517 B1 EP0344517 B1 EP 0344517B1 EP 89108884 A EP89108884 A EP 89108884A EP 89108884 A EP89108884 A EP 89108884A EP 0344517 B1 EP0344517 B1 EP 0344517B1
Authority
EP
European Patent Office
Prior art keywords
compressor
side channel
injection nozzle
cooling liquid
injection
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
EP89108884A
Other languages
German (de)
French (fr)
Other versions
EP0344517A1 (en
Inventor
Siegfried Dipl.-Ing. Schönwald
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0344517A1 publication Critical patent/EP0344517A1/en
Application granted granted Critical
Publication of EP0344517B1 publication Critical patent/EP0344517B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D23/00—Other rotary non-positive-displacement pumps
    • F04D23/008—Regenerative pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/5846—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling by injection

Definitions

  • the invention relates to a side channel compressor according to the preamble of claim 1 and 2 respectively.
  • a multi-stage radial compressor is known from US Pat. No. 2,786,626, in which a cooling liquid is injected into the deflection bend provided between adjacent compressor stages for cooling. Intensive cooling is achieved by the evaporation of the cooling liquid.
  • the invention has for its object to provide a side channel compressor of the generic type so that an intensive cooling of the same is achieved.
  • a reduction in the intake volume of the side channel compressor can be avoided by arranging the injection nozzle or injectors approximately in the circumferential center of the compressor housing lying between the inlet and outlet openings.
  • the cooling liquid By introducing the cooling liquid at a point further away from the inlet opening, there are no repercussions on the suction behavior of the side channel compressor on. This can be explained by the fact that the contact caused by the injection of the coolant results in a volume reduction of the gas, ie a reduction in pressure. Since the additional volume required for the injected coolant is largely compensated for by the reduction in volume of the gas, there is no significant change in pressure in the injection area which influences the intake behavior of the side channel compression.
  • the injection nozzle or injection nozzles are arranged on the housing of the compressor stage or compressor stages downstream of the input compressor stage. Since there is a higher temperature level in the downstream compressor stage, the cooling has a particularly intensive effect.
  • FIG. 1 and 2 designate two side-channel compressors assembled to form a multi-stage compressor unit.
  • the outer housing parts 3 and 4 of the two side channel compressors 1 and 2 are supplemented by an intermediate housing part 5 to complete compressor housings, in which there are impellers 8 and 9 arranged on a common, rotatably mounted shaft 6 and provided with conveyor blades 7.
  • a side channel 10 is formed laterally to the conveyor blades 7 by a corresponding bulging of the housing parts 3, 4 and 5.
  • An injection nozzle 13 is arranged on the intermediate housing part 5 approximately in the middle of the circumference between the inlet opening 11 and the outlet opening 12 of the intermediate housing part 5. Via this injection nozzle 13, for example, water can be injected into the side channel 10, the evaporation of which cools the gas conveyed by the side channel compressor.
  • the injection nozzle 13 is attached to the intermediate housing part 5 at an incline such that its injection direction corresponds as closely as possible to the direction of flow of the conveyed gas at the installation location of the injection nozzle 13.
  • This arrangement of the injection nozzle largely prevents a disturbance in the gas flow due to eddy formation.
  • the mixture of gas and cooling liquid then enters from the side into the spaces between the conveyor blades 7, so that a hard impact of the cooling liquid particles on the conveyor blades 7, which leads to cavitation damage, is largely excluded.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft einen Seitenkanalverdichter gemäß dem Oberbegriff des Anspruchs 1 bzw.2.The invention relates to a side channel compressor according to the preamble of claim 1 and 2 respectively.

Es ist bekannt, wegen der beim Verdichten eines Gases entstehenden Erwärmung einen Seitenkanalverdichter zu kühlen, um dadurch einer durch die Erwärmung bedingten Leistungsbegrenzung entgegenzuwirken.It is known to cool a side channel compressor because of the heating that occurs during the compression of a gas, in order to counteract a power limitation due to the heating.

Bei einem durch die DE-A- 2 138 383 bekannten Pumpenaggregat, das aus einem Flüssigkeitsringverdichter und diesem nachgeschalteten Seitenkanalverdichter besteht, hat man eine Kühlung des Seitenkanalverdichters durch die Betriebs- bzw. Kühlflüssigkeit des Flüssigkeitsringverdichters vorgesehen. Wie diese Kühlung des Seitenkanalverdichters vorgenommen wird, ist in dieser Schrift nicht näher erläutert; es ist lediglich in der Zeichnung eine dem Seitenkanalverdichter zugeordnete, von der Betriebs- oder Kühlflüssigkeit des Flüssigkeitsringverdichters durchflossene Kühlschlange angedeutet.In a pump unit known from DE-A-2 138 383, which consists of a liquid ring compressor and this side channel compressor, cooling of the side channel compressor has been provided by the operating or cooling liquid of the liquid ring compressor. How this cooling of the side channel compressor is carried out is not explained in this document; all that is indicated in the drawing is a cooling coil associated with the side channel compressor and through which the operating or cooling liquid of the liquid ring compressor flows.

Durch die US-A-2 786 626 ist ein mehrstufiger Radial-Verdichter bekannt, bei dem zur Kühlung eine Kühlflüssigkeit in den zwischen benachbarten Verdichterstufen vorgesehenen Umlenkkrümmer eingespritzt wird. Durch die Verdampfung der Kühlflüssigkeit wird eine intensive Kühlung erreicht.A multi-stage radial compressor is known from US Pat. No. 2,786,626, in which a cooling liquid is injected into the deflection bend provided between adjacent compressor stages for cooling. Intensive cooling is achieved by the evaporation of the cooling liquid.

Der Erfindung liegt die Aufgabe zugrunde, einen Seitenkanalverdichter der gattungsgemäßen Art so auszubilden, daß eine intensive Kühlung desselben erreicht wird.The invention has for its object to provide a side channel compressor of the generic type so that an intensive cooling of the same is achieved.

Die Lösung dieser Aufgabe ist nicht durch eine bloße Übertragung der bei einem Radialverdichter bekannten Maßnahme des Einspritzens einer Kühlflüssigkeit möglich. Im Gegensatz zu einem Radial-Verdichter, bei dem vom Einspritzort der Kühlflüssigkeit bis zu deren Eintritt in das Laufrad der nachfolgenden Verdichterstufe eine relativ lange Strecke vorliegt, auf der die Flüssigkeit verdampfen kann, ist bei einem Seitenkanalverdichter zwischen einer möglichen Einspritzstelle und dem Eintritt in das Laufrad nur eine sehr kurze Entfernung gegeben. Damit besteht die Gefahr, daß die Förderschaufeln des Laufrades durch noch nicht verdampfte Flüssigkeitstropfen beschädigt werden.The solution to this problem is not a mere transfer of the measure known in a radial compressor Injection of a coolant possible. In contrast to a radial compressor, in which there is a relatively long distance from the injection point of the coolant to its entry into the impeller of the subsequent compressor stage, on which the liquid can evaporate, there is a side channel compressor between a possible injection point and the entry into the Impeller given only a very short distance. There is therefore a risk that the impeller blades of the impeller will be damaged by drops of liquid which have not yet evaporated.

Die der Erfindung zugrundeliegende Aufgabe wird durch die im Kennzeichen des Anspruchs 1 bzw.2 angegebenen Merkmale gelöst.The object on which the invention is based is achieved by the features specified in the characterizing part of claim 1 or 2.

Bei der Lösung nach Anspruch 1 kommt es zu einer starken Verwirbelung der Kühlflüssigkeit und damit zu einer intensiven Vermischung der Kühlflüssigkeit mit dem zu verdichten Gas, so daß eine möglichst weitgehende Verdampfung der Kühlflüssigkeit erreicht wird.In the solution according to claim 1 there is a strong swirling of the cooling liquid and thus an intensive mixing of the cooling liquid with the gas to be compressed, so that the greatest possible evaporation of the cooling liquid is achieved.

Bei der Lösung nach Anspruch 2 ergibt sich trotz einer weniger starken Verwirbelung der Kühlflüssigkeit noch eine ausreichende Vermischung mit dem zu verdichtenden Gas. Wegen der Übereinstimmung der Einspritzrichtung der Kühlflüssigkeit mit der Strömungsrichtung des Gases kommt es zu einer weniger starken, die Förderleistung des Seitenkanalverdichters beeinträchtigenden Wirbelbildung.In the solution according to claim 2, despite a less pronounced swirling of the cooling liquid, there is still sufficient mixing with the gas to be compressed. Because the direction of injection of the coolant coincides with the direction of flow of the gas, there is less vortex formation, which impairs the delivery capacity of the side channel compressor.

Eine Verminderung des Ansaugvolumens des Seitenkanalverdichters läßt sich dadurch vermeiden, daß die Einspritzdüse bzw. Einspritzdüsen etwa in der zwischen der Einlaß- und Auslaßöffnung liegenden Umfangsmitte des Verdichtergehäuses angeordnet ist bzw. sind. Ourch das Einbringen der Kühlflüssigkeit an einer von der Einlaßöffnung weiter entfernt liegenden Stelle treten keine Rückwirkungen auf das Ansaugverhalten des Seitenkanalverdichters auf. Dies ist dadurch zu erklären, daß die durch das Einspritzen des Kühlmittels Dewirkte Kührung eine Volumenminderung des Gases, d.h. eine Druckreduzierung zur Folge hat. Da das für das eingespritzte Kühlmittel zusätzlich erforderliche Volumen weitgehend durch die Volumenminderung des Gases ausgeglichen wird, kommt es zu keiner nennenswerte, das Ansaugverhalten des Seitenkanalverdichtes beeinflußenden Druckänderung im Einspritzbereich.A reduction in the intake volume of the side channel compressor can be avoided by arranging the injection nozzle or injectors approximately in the circumferential center of the compressor housing lying between the inlet and outlet openings. By introducing the cooling liquid at a point further away from the inlet opening, there are no repercussions on the suction behavior of the side channel compressor on. This can be explained by the fact that the contact caused by the injection of the coolant results in a volume reduction of the gas, ie a reduction in pressure. Since the additional volume required for the injected coolant is largely compensated for by the reduction in volume of the gas, there is no significant change in pressure in the injection area which influences the intake behavior of the side channel compression.

Bei einem mehrstufigen Verdichteraggregat ist es zweckmäßig, die Einspritzdüse bzw. Einspritzdüsen am Gehäuse der der Eingangsverdichterstufe nachgeschalteten Verdichterstufe bzw. Verdichterstufen anzuordnen. Da in der nachgeschalteten Verdichterstufe ein höheres Temperaturniveau herrscht, wirkt sich die Kühlung besonders intensiv aus.In the case of a multi-stage compressor unit, it is expedient to arrange the injection nozzle or injection nozzles on the housing of the compressor stage or compressor stages downstream of the input compressor stage. Since there is a higher temperature level in the downstream compressor stage, the cooling has a particularly intensive effect.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispieles wird der Anmeldungsgegenstand nachfolgend näher beschrieben. Es zeigen:

  • FIG 1 einen aus zwei Verdichterstufen bestehenden Seitenkanalverdichter im Längsschnitt,
  • FIG 2 eine Draufsicht eines mit einer Einspritzdüse versehenen Gehäuseteiles des Seitenkanalverdichters.
The subject of the application is described in more detail below using an exemplary embodiment shown in the drawing. Show it:
  • 1 shows a side channel compressor consisting of two compressor stages in longitudinal section,
  • 2 shows a plan view of a housing part of the side channel compressor provided with an injection nozzle.

Mit 1 und 2 sind zwei zu einem mehrstufigen Verdichteraggregat zusammengebaute Seitenkanalverdichter bezeichnet. Die äußeren Gehäuseteile 3 und 4 der beiden Seitenkanalverdichter 1 und 2 sind durch ein Zwischengehäuseteil 5 zu vollständigen Verdichtergehäusen ergänzt, in denen sich auf einer gemeinsamen, drehbar gelagerten Welle 6 angeordnete, mit Förderschaufeln 7 versehene Laufräder 8 und 9 befinden. Seitlich zu den Förderschaufeln 7 ist durch entsprechende Auswölbung der Gehäuseteile 3, 4 und 5 jeweils ein Seitenkanal 10 gebildet.1 and 2 designate two side-channel compressors assembled to form a multi-stage compressor unit. The outer housing parts 3 and 4 of the two side channel compressors 1 and 2 are supplemented by an intermediate housing part 5 to complete compressor housings, in which there are impellers 8 and 9 arranged on a common, rotatably mounted shaft 6 and provided with conveyor blades 7. A side channel 10 is formed laterally to the conveyor blades 7 by a corresponding bulging of the housing parts 3, 4 and 5.

An dem Zwischengehäuseteil 5 ist etwa in der Mitte des Umfanges zwischen der Einlaßöffnung 11 und der Auslaßöffnung 12 des Zwischengehäuseteiles 5 eine Einspritzdüse 13 angeordnet. Über diese Einspritzdüse 13 kann beispielsweise Wasser in den Seitenkanal 10 eingespritzt werden, durch dessen Verdampfung das durch den Seitenkanalverdichter geförderte Gas gekühlt wird. Die Einspritzdüse 13 ist derart geneigt am Zwischengehäuseteil 5 angebracht, daß ihre Einspritzrichtung möglichst mit der Strömungsrichtung des geförderten Gases an der Einbaustelle der Einspritzdüse 13 übereinstimmt.An injection nozzle 13 is arranged on the intermediate housing part 5 approximately in the middle of the circumference between the inlet opening 11 and the outlet opening 12 of the intermediate housing part 5. Via this injection nozzle 13, for example, water can be injected into the side channel 10, the evaporation of which cools the gas conveyed by the side channel compressor. The injection nozzle 13 is attached to the intermediate housing part 5 at an incline such that its injection direction corresponds as closely as possible to the direction of flow of the conveyed gas at the installation location of the injection nozzle 13.

Durch diese Anordnung der Einspritzdüse wird weitgehend eine Störung der Gasströmung durch Wirbelbildung vermieden. Außerdem tritt bereits im Seitenkanal 10 eine Vermischung der Kühlflüssigkeit mit dem Gas und auch schon eine teilweise Verdampfung der Kühlflüssigkeit ein. Das Gemisch aus Gas und Kühlflüssigkeit tritt dann von der Seite in die Zwischenräume zwischen den Förderschaufeln 7 ein, so daß ein zu Kavitationsschäden führendes hartes Auftreffen der Kühlflüssigkeitspartikel auf die Förderschaufeln 7 weitgehend ausgeschlossen ist.This arrangement of the injection nozzle largely prevents a disturbance in the gas flow due to eddy formation. In addition, a mixing of the cooling liquid with the gas and a partial evaporation of the cooling liquid already occurs in the side channel 10. The mixture of gas and cooling liquid then enters from the side into the spaces between the conveyor blades 7, so that a hard impact of the cooling liquid particles on the conveyor blades 7, which leads to cavitation damage, is largely excluded.

Claims (4)

1. Side channel compressor, with an impeller (8,9) having conveyer blades (7) and with a device for cooling by means of a cooling liquid, characterized in that at the part of the compressor housing forming the side channel (10) at least one injection nozzle (13) is provided for the introduction of the cooling liquid into the conveying track of the compressor, whereby the injection nozzle (13) is arranged in the blade-free side channel and is aligned so as to be inclined against the conveying direction of the side channel compressor.
2. Side channel compressor, with an impeller (8,9) having conveyer blades (7) and with a device for cooling by means of a cooling liquid, characterized in that at the part of the compressor housing forming the side channel (10) at least one injection nozzle (13) is provided for the introduction of the cooling liquid into the conveying track of the compressor, whereby the injection nozzle (13) is arranged in the blade-free side channel and is aligned so as to be inclined in the conveying direction of the side channel compressor in such a way that its injection direction corresponds as much as possible with the flow direction of the gas conveyed from the side channel compressor, which flow direction predominantly prevails at its site of installation.
3. Side channel compressor according to claim 1 or 2, characterized in that the injection nozzle (13) or injection nozzles is or are arranged approximately in the circumferential centre of the compressor housing, the circumferential centre lying between the inlet and outlet opening (11 and 12).
4. Side channel compressor according to claim 1,2 or 3, which consists of several compressor stages, characterized in that the injection nozzle (13) or injection nozzles is or are arranged at the housing of the compressor stage or compressor stages connected after the input compressor stage.
EP89108884A 1988-05-30 1989-05-17 Side channel compressor Expired - Lifetime EP0344517B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8807064U 1988-05-30
DE8807064U DE8807064U1 (en) 1988-05-30 1988-05-30 Side channel blower

Publications (2)

Publication Number Publication Date
EP0344517A1 EP0344517A1 (en) 1989-12-06
EP0344517B1 true EP0344517B1 (en) 1992-05-20

Family

ID=6824548

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108884A Expired - Lifetime EP0344517B1 (en) 1988-05-30 1989-05-17 Side channel compressor

Country Status (4)

Country Link
US (1) US4907945A (en)
EP (1) EP0344517B1 (en)
JP (1) JPH0746796Y2 (en)
DE (2) DE8807064U1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9006172U1 (en) * 1990-05-31 1991-10-10 Siemens AG, 8000 München Side channel blower
US5372475A (en) * 1990-08-10 1994-12-13 Nippondenso Co., Ltd. Fuel pump
JP2917563B2 (en) * 1991-04-15 1999-07-12 株式会社デンソー Swirl pump
US6174128B1 (en) 1999-02-08 2001-01-16 Ford Global Technologies, Inc. Impeller for electric automotive fuel pump
US6233937B1 (en) 2000-09-20 2001-05-22 Siemens Westinghouse Power Corporation Cooling spray application to a turbine and exhaust region of a steam turbine
EP2087241A4 (en) * 2006-11-06 2014-06-11 Borgwarner Inc Dual inlet regenerative air pump
US9249806B2 (en) 2011-02-04 2016-02-02 Ti Group Automotive Systems, L.L.C. Impeller and fluid pump

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191128731A (en) * 1911-12-20 1912-09-05 Richard James Wainwright Brown Improvements in and relating to Fluid Pressure Turbines.
GB153603A (en) * 1919-11-10 1921-12-08 Escher Wyss Maschf Ag Improvements in a process for compressing vapour in multi-stage centrifugal compressors
US1400813A (en) * 1920-11-03 1921-12-20 Graemiger Benjamin Process of compressing vapor in multistage centrifugal compressors
US2786626A (en) * 1952-08-07 1957-03-26 Gulf Oil Corp Process for the compression of gases
US3233551A (en) * 1964-02-03 1966-02-08 Hitachi Ltd Westco pump
US3436916A (en) * 1967-10-02 1969-04-08 John Edward Becker Hydraulic couplings
US3663117A (en) * 1970-01-21 1972-05-16 Cornell Mfg Co Aeration pump
DE2166847A1 (en) * 1971-07-31 1976-01-29 Siemens Ag MULTI-STAGE PUMP ARRANGEMENT
DE2138383A1 (en) * 1971-07-31 1973-02-08 Siemens Ag PUMP UNIT FOR MULTI-STAGE COMPRESSION OF GASES
DE7715000U1 (en) * 1977-05-11 1977-08-18 Siemens Ag, 1000 Berlin Und 8000 Muenchen MULTI-STAGE SIDE CHANNEL COMPRESSOR
US4695224A (en) * 1982-01-04 1987-09-22 General Electric Company Centrifugal compressor with injection of a vaporizable liquid

Also Published As

Publication number Publication date
JPH0746796Y2 (en) 1995-10-25
DE8807064U1 (en) 1989-09-28
US4907945A (en) 1990-03-13
EP0344517A1 (en) 1989-12-06
DE58901457D1 (en) 1992-06-25
JPH01174596U (en) 1989-12-12

Similar Documents

Publication Publication Date Title
DE3889539T2 (en) GAS TURBINE COMBUSTION CHAMBER WITH TANGENTIAL FUEL INJECTION AND ADDITIONAL FUEL JETS.
DE69216938T2 (en) Compressor housing for turbochargers
DE4137179C2 (en) Device for producing a water-in-oil emulsion and use of the device on a diesel engine
EP0344517B1 (en) Side channel compressor
EP0191153A2 (en) Fluidseparator, especially gas/liquid separator
DE2950060C2 (en)
DE3209035C2 (en)
EP0567874B1 (en) Flow machine for gas compression
DE4023724A1 (en) Radial-flow fan with radial impeller - has inlet nozzle with arcuated contour shifted radially inwards for specified tangent inclination
EP0286954A2 (en) Self-priming centrifugal pump
EP0656479A1 (en) One stage vane compressor
DE3640894C2 (en) Inlet housing for centrifugal pump
EP0459269B1 (en) Side channel compressor
DE3248440A1 (en) Compressor
DE2633781C3 (en) Radial fan for high pressure ratio
DE10226593A1 (en) Process chamber of a system for the temperature treatment of printed circuit boards
EP0772745B1 (en) Fuel feeding device with a sucking jet pump
DE890256C (en) Liquid ring compressor
DE2707860A1 (en) FLOW MACHINE FOR GAS MEDIA WITH A HEAT EXCHANGER
DE4230770C2 (en) Centrifugal compressors for gas compression
DE3743700A1 (en) Two-stage pump
DE3112403A1 (en) Vacuum cleaner nozzle
DE358244C (en) Cooler for centrifugal compressor
DE2165002C3 (en)
DE102024108306A1 (en) CHARGING DEVICE AND SYSTEM WITH THE SAME

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): DE FR GB IT

17P Request for examination filed

Effective date: 19900110

17Q First examination report despatched

Effective date: 19900914

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 58901457

Country of ref document: DE

Date of ref document: 19920625

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ITF It: translation for a ep patent filed
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
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970418

Year of fee payment: 9

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

Ref country code: FR

Payment date: 19970521

Year of fee payment: 9

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

Ref country code: DE

Payment date: 19970721

Year of fee payment: 9

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: 19980517

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

Ref country code: FR

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

Effective date: 19980531

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

Effective date: 19980517

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: 19990302

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

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: 20050517