EP0286824B1 - Regenerative compressor - Google Patents

Regenerative compressor Download PDF

Info

Publication number
EP0286824B1
EP0286824B1 EP88103526A EP88103526A EP0286824B1 EP 0286824 B1 EP0286824 B1 EP 0286824B1 EP 88103526 A EP88103526 A EP 88103526A EP 88103526 A EP88103526 A EP 88103526A EP 0286824 B1 EP0286824 B1 EP 0286824B1
Authority
EP
European Patent Office
Prior art keywords
housing
blade ring
gap
channel compressor
stripper
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
EP88103526A
Other languages
German (de)
French (fr)
Other versions
EP0286824A1 (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 EP0286824A1 publication Critical patent/EP0286824A1/en
Application granted granted Critical
Publication of EP0286824B1 publication Critical patent/EP0286824B1/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

Definitions

  • the invention relates to a side channel blower with an impeller rotatably mounted in its housing according to the preamble of claim 1.
  • Such a side channel compressor is known from DE-PS 27 13 091. It has been shown that when gases laden with dust are conveyed, dust can be deposited in the gap between the base of the blade ring and the part of the housing which engages under it. The dust deposits can become so strong, especially when it is sticky or moisture-laden dust, that the gap is completely blocked by the dust. This leads to high frictional forces, which under certain circumstances can become so large that they block the impeller or prevent a restart after a break in operation.
  • the invention has for its object to develop a side channel compressor according to the preamble of claim 1 so that blocking of the impeller is prevented by deposited dust.
  • the scraper is arranged in the circumferential direction of the housing in the region between the center of the housing relating to the inlet and outlet opening and the inlet opening. In this area there is still a relatively low pressure in the side channel, so that the loss flow resulting from the high pressure side is already sufficiently strong to be able to transport the loosened dust out of the gap into the side channel. It is particularly advantageous that the scraper is arranged closer to the inlet opening.
  • FIG. 1 denotes a side channel compressor, the housing of which consists of two interconnected housing halves 2 and 3.
  • An impeller 4 is rotatably mounted in the housing and connected to a shaft 5 driven by a motor (not shown in the drawing).
  • the impeller 4 consists of a disk-shaped hub part 6 and a blade ring 7 arranged on its outer circumference.
  • the blade ring 7 has a greater width than the hub part 6, so that it projects beyond it on both sides in the direction of the axis of rotation of the impeller 4.
  • the two housing halves 2 and 3 are designed such that they overlap the laterally projecting sections of the blade ring 7.
  • the dimensions of the housing halves 2 and 3 are made in relation to the impeller 4 so that there is a radial gap 10 between the projecting section 8 and the lower part 9 of the housing halves 2 and 3 and an axial gap 13 with respect to the hub part 6. This ensures contactless rotation of the impeller 4 relative to the housing halves 2 and 3.
  • Wipers 11 are used on the outer circumference of the lower part 9 of the housing halves 2 and 3, which protrude in the radial direction beyond the outer circumferential contour of the lower part 9 of the respective housing half 2 or 3.
  • the wipers 11 are dimensioned in their radial dimensions such that a radial remaining gap 12 remains between them and the projecting section 8 of the blade ring 7.
  • wipers in the axial gap 13 if dust deposits should occur there. These wipers would then extend in the radial direction on the respective housing half 2 or 3.
  • Side channel compressors in which the blade ring 7 and the hub part 6 have the same width, only have an axial gap between the housing halves and the impeller. With such side channel compressors, only strippers extending in the radial direction can then be arranged on the respective housing half.
  • the arrangement of a scraper 11 on the circumference of the respective housing halves 2 and 3 is sufficient. It is useful to arrange the scraper 11 in the area towards the inlet opening of the side channel compressor, since there is a higher loss flow due to the higher pressure gradient to the side channel in the gap, which ensures that the loosened dust is removed from the gap.

Landscapes

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

Description

Die Erfindung betrifft einen Seitenkanalverdichter mit einem in seinem Gehäuse drehbar gelagerten Laufrad gemäß dem Oberbegriff des Anspruches 1.The invention relates to a side channel blower with an impeller rotatably mounted in its housing according to the preamble of claim 1.

Ein solcher Seitenkanalverdichter ist durch die DE-PS 27 13 091 bekannt. Es hat sich gezeigt, daß bei der Förderung von mit Staub beladenen Gasen Staub in dem Spalt zwischen dem Fuß des Schaufelkranzes und dem diesen untergreifenden Teil des Gehäuses abgelagert werden kann. Dabei können die Staubablagerungen insbesondere dann, wenn es sich um klebrigen oder mit Feuchtigkeit behafteten Staub handelt, so stark werden, daß der Spalt vollständig vom Staub zugesetzt wird. Dies führt zu hohen Reibungskräften, die unter Umständen so groß werden können, daß sie das Laufrad blockieren oder einen Wiederanlauf nach einer Betriebspause verhindern.Such a side channel compressor is known from DE-PS 27 13 091. It has been shown that when gases laden with dust are conveyed, dust can be deposited in the gap between the base of the blade ring and the part of the housing which engages under it. The dust deposits can become so strong, especially when it is sticky or moisture-laden dust, that the gap is completely blocked by the dust. This leads to high frictional forces, which under certain circumstances can become so large that they block the impeller or prevent a restart after a break in operation.

Der Erfindung liegt die Aufgabe zugrunde, einen Seitenkanalverdichter gemäß dem Oberbegriff des Anspruches 1 so weiterzubilden, daß eine Blockierung des Laufrades durch abgelagerten Staub unterbunden wird.The invention has for its object to develop a side channel compressor according to the preamble of claim 1 so that blocking of the impeller is prevented by deposited dust.

Die Lösung der gestellten Aufgabe gelingt durch die im Kennzeichen des Anspruches 1 angegebenen Merkmale. Durch einen in dem radialen Spalt angeordneten Abstreifer wird der sich an dem seitlich überragenden Abschnitt des Schaufelkranzes ablagernde Staub abgestreift und damit ein Zusetzen des radialen Spaltes vermieden. Die am Abstreifer auftretenden Reibungskräfte sind so gering, daß sie von dem Antriebsmotor sicher überwunden werden.The problem is solved by the features specified in the characterizing part of claim 1. By means of a scraper arranged in the radial gap, the dust which is deposited on the laterally projecting section of the blade ring is scraped off and thus clogging of the radial gap is avoided. The frictional forces occurring on the scraper are so low that they are surely overcome by the drive motor.

Dadurch, daß zwischen dem Abstreifer und dem seitlich überragenden Abschnitt des Schaufelkranzes ein radialer Restspalt besteht, werden Reibungskräfte vermieden, solange keine Ablagerung erfolgt ist.The fact that there is a radial residual gap between the scraper and the laterally projecting section of the blade ring, frictional forces are avoided as long as no deposit has occurred.

Damit der durch den Abstreifer gelöste Staub auch aus dem Spalt abtransportiert wird, ist es vorteilhaft, daß der Abstreifer in Umfangsrichtung des Gehäuses in dem Bereich zwischen der auf die Einlaß- und Auslaßöffnung bezogenen Mitte des Gehäuses und der Einlaßöffnung angeordnet ist. In diesem Bereich herrscht noch ein relativ niederer Druck im Seitenkanal, so daß die von der Hochdruckseite herrührende Verlustströmung schon entsprechend stark genug ist, um den gelockerten Staub aus dem Spalt in den Seitenkanal transportieren zu können. Dabei ist von besonderem Vorteil, daß der Abstreifer näher zur Einlaßöffnung hin angeordnet ist.So that the dust loosened by the scraper is also removed from the gap, it is advantageous for the scraper to be arranged in the circumferential direction of the housing in the region between the center of the housing relating to the inlet and outlet opening and the inlet opening. In this area there is still a relatively low pressure in the side channel, so that the loss flow resulting from the high pressure side is already sufficiently strong to be able to transport the loosened dust out of the gap into the side channel. It is particularly advantageous that the scraper is arranged closer to the inlet opening.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispiels wird der Anmeldungsgegenstand nachfolgend näher beschrieben.The subject of the application is described in more detail below using an exemplary embodiment shown in the drawing.

Es zeigt:

  • FIG 1 einen Seitenkanalverdichter im Schnitt,
  • FIG 2 in vergrößterter Darstellung die Anordnung von Abstreifern am Gehäuse des Seitenkanalverdichters,
  • FIG 3 einen Schnitt entlang der Linie 111-111 in FIG 2.
It shows:
  • 1 shows a side channel compressor in section,
  • 2 shows an enlarged view of the arrangement of scrapers on the housing of the side channel compressor,
  • 3 shows a section along the line 111-111 in FIG.

Mit 1 ist ein Seitenkanalverdichter bezeichnet, dessen Gehäuse aus zwei miteinander verbundenen Gehäusehälften 2 und 3 besteht. In dem Gehäuse ist ein Laufrad 4 drehbar gelagert und mit einer von einem in der Zeichnung nicht dargestellten Motor angetriebenen Welle 5 verbunden. Das Laufrad 4 besteht aus einem scheibenförmigen Nabenteil 6 und einem an dessen Außenumfang angeordneten Schaufelkranz 7. Der Schaufelkranz 7 weist eine größere Breite als der Nabenteil 6 auf, so daß er diesen zu beiden Seiten in Richtung der Drehachse des Laufrades 4 überragt. Die beiden Gehäusehälften 2 und 3 sind derart ausgebildet, daß sie die seitlich überragenden Abschnitte des Schaufelkranzes 7 übergreifen. Die Abmessungen der Gehäusehälften 2 und 3 sind in Bezug auf das Laufrad 4 so getroffen, daß zwischen dem überragenden Abschnitt 8 und dem untergreifenen Teil 9 der Gehäusehälften 2 und 3 ein radialer Spalt 10 sowie gegenüber dem Nabenteil 6 ein axialer Spalt 13 besteht. Damit ist ein berührungsloses Drehen des Laufrades 4 gegenüber den Gehäusehälften 2 und 3 gewährleistet.1 denotes a side channel compressor, the housing of which consists of two interconnected housing halves 2 and 3. An impeller 4 is rotatably mounted in the housing and connected to a shaft 5 driven by a motor (not shown in the drawing). The impeller 4 consists of a disk-shaped hub part 6 and a blade ring 7 arranged on its outer circumference. The blade ring 7 has a greater width than the hub part 6, so that it projects beyond it on both sides in the direction of the axis of rotation of the impeller 4. The two housing halves 2 and 3 are designed such that they overlap the laterally projecting sections of the blade ring 7. The dimensions of the housing halves 2 and 3 are made in relation to the impeller 4 so that there is a radial gap 10 between the projecting section 8 and the lower part 9 of the housing halves 2 and 3 and an axial gap 13 with respect to the hub part 6. This ensures contactless rotation of the impeller 4 relative to the housing halves 2 and 3.

Am Außenumfang des untergreifenden Teiles 9 der Gehäusehälften 2 und 3 sind Abstreifer 11 eingesetzt, die in radialer Richtung über die äußere Umfangskontur des untergreifenden Teiles 9 der jeweiligen Gehäusehälfte 2 bzw.3 vorstehen. Um ein ständiges Reiben der Abstreifer 11 an dem überragenden Abschnitt 8 des Schaufelkranzes 7 zu vermeiden, sind die Abstreifer 11 in ihren radialen Abmessungen so dimensioniert, daß zwischen ihnen und dem überragenden Abschnitt 8 des Schaufelkranzes 7 noch ein radialer Restspalt 12 verbleibt.Wipers 11 are used on the outer circumference of the lower part 9 of the housing halves 2 and 3, which protrude in the radial direction beyond the outer circumferential contour of the lower part 9 of the respective housing half 2 or 3. In order to avoid constant rubbing of the wipers 11 on the projecting section 8 of the blade ring 7, the wipers 11 are dimensioned in their radial dimensions such that a radial remaining gap 12 remains between them and the projecting section 8 of the blade ring 7.

Durch die über den radialen und axialen Spalt 10 und 13 als Spaltverluste abströmende Luft werden in der Luft enthaltene Staubpartikel in diese Spalte transportiert. Es hat sich nun gezeigt, daß es in dem radialen Spalt 10 zu Ablagerungen des Staubes an dem überragenden Abschnitt 8 des Schaufelkranzes 7 kommen kann. Diese Ablagerungen sind besonders stark, wenn der in der Luft enthaltene Staub klebrig oder feucht ist. Durch die Abstreifer 11 wird der sich an dem Abschnitt 8 des Schaufelkranzes 7 anlagernde Staub infolge der Drehung des Laufrades 4 abgestreift und dadurch ein vollständiges Verschließen des radialen Spaltes 10, wodurch eine Blockierung des Laufrades 4 erfolgen würde, verhindert. Reibungskräfte können somit nur noch an der kleinen Fläche des Abstreifers 11 wirksam werden. Diese Reibungskräfte sind jedoch so klein, daß sie zu keiner Blockierung des Laufrades 4 führen.Due to the air flowing out via the radial and axial gap 10 and 13 as gap losses, dust particles contained in the air are transported into this column. It has now been shown that dust can accumulate in the radial gap 10 on the projecting section 8 of the blade ring 7. These deposits are particularly strong when the dust in the air is sticky or moist. The wipers 11 wipe off the dust accumulating on the section 8 of the blade ring 7 as a result of the rotation of the impeller 4 and thereby prevent the radial gap 10 from being completely closed, as a result of which the impeller 4 would be blocked. Frictional forces can thus only be effective on the small area of the scraper 11. However, these frictional forces are so small that they do not lead to the impeller 4 being blocked.

Es besteht auch die Möglichkeit in dem axialen Spalt 13 Abstreifer anzuordnen, wenn dort Staubablagerungen auftreten sollten. Diese Abstreifer würden sich dann an der jeweiligen Gehäusehälfte 2 bzw.3 in radialer Richtung erstrecken. Seitenkanalverdichter, bei denen der Schaufelkranz 7 und der Nabenteil 6 gleiche Breite aufweisen, besitzen nur einen axialen Spalt zwischen den Gehäusehälften und dem Laufrad. Bei solchen Seitenkanalverdichtern können dann nur sich in radialer Richtung erstreckende Abstreifer an der jeweiligen Gehäusehälfte angeordnet werden.It is also possible to arrange wipers in the axial gap 13 if dust deposits should occur there. These wipers would then extend in the radial direction on the respective housing half 2 or 3. Side channel compressors, in which the blade ring 7 and the hub part 6 have the same width, only have an axial gap between the housing halves and the impeller. With such side channel compressors, only strippers extending in the radial direction can then be arranged on the respective housing half.

In der Regel reicht die Anordnung eines Abstreifers 11 am Umfang der jeweiligen Gehäusehälften 2 bzw.3 aus. Dabei ist es nützlich, den Abstreifer 11 in dem Bereich zur Einlaßöffnung des Seitenkanalverdichters hin anzuordnen, da dort infolge des höheren Druckgefälles zum Seitenkanal im Spalt eine höhere Verlustströmung herrscht, die für einen Abtransport des gelösten Staubes aus dem Spalt sorgt.As a rule, the arrangement of a scraper 11 on the circumference of the respective housing halves 2 and 3 is sufficient. It is useful to arrange the scraper 11 in the area towards the inlet opening of the side channel compressor, since there is a higher loss flow due to the higher pressure gradient to the side channel in the gap, which ensures that the loosened dust is removed from the gap.

Claims (4)

1. Side-channel compressor having a rotor, rotatably mounted in its housing, which comprises a disc- shaped hub portion (6) and a blade ring (7) arranged on the outer circumference of this hub portion (6), the blade ring (7) laterally projecting beyond the hub portion (6) at least on one side in the direction of the axis of rotation, in which side-channel compressor the housing (1) at least partially extends under the section (e) of the blade ring (7) laterally projecting beyond the hub portion (6) leaving a radial gap (10), characterised in that on the portion (9) of the housing (1) extending under the blade ring (7) there is arranged at least one stripper (11) projecting radially into the gap (10) and extending at least approximately over the entire width of the said underextending portion (9) of the housing (1).
2. Side-channel compressor according to claim 1, characterised in that between the stripper (11) and the laterally projecting section (8) of the blade ring (7) there is produced a radial residual gap (12).
3. Side-channel compressor according to claim 1 or 2, characterised in that the stripper (11) is arranged, in the circumferential direction of the housing (1), in the region between the centre of the housing (10), with respect to the inlet and outlet aperture, and the inlet aperture.
4. Side-channel compressor according to claim 3, characterised in that the stripper (11) is arranged closer to the inlet aperture.
EP88103526A 1987-03-18 1988-03-07 Regenerative compressor Expired - Lifetime EP0286824B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8704066U 1987-03-18
DE8704066U DE8704066U1 (en) 1987-03-18 1987-03-18 Side channel blower

Publications (2)

Publication Number Publication Date
EP0286824A1 EP0286824A1 (en) 1988-10-19
EP0286824B1 true EP0286824B1 (en) 1990-09-19

Family

ID=6806022

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103526A Expired - Lifetime EP0286824B1 (en) 1987-03-18 1988-03-07 Regenerative compressor

Country Status (3)

Country Link
US (1) US4806073A (en)
EP (1) EP0286824B1 (en)
DE (2) DE8704066U1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3863775D1 (en) * 1988-12-05 1991-08-22 Siemens Ag SIDE CHANNEL COMPRESSORS.
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
US5658126A (en) * 1994-10-20 1997-08-19 Siemens Aktiengesellschaft Side channel compressor
EP0850361B1 (en) * 1995-09-13 2001-03-21 Siemens Aktiengesellschaft Side channel compressor
CN1147601A (en) * 1995-09-15 1997-04-16 西门子公司 side channel compressor
US6174128B1 (en) 1999-02-08 2001-01-16 Ford Global Technologies, Inc. Impeller for electric automotive fuel pump
DE202004019366U1 (en) * 2004-12-15 2006-04-20 Nash_Elmo Industries Gmbh Compressor, in particular side channel compressor
DE202005001604U1 (en) * 2005-02-02 2006-06-08 Nash_Elmo Industries Gmbh Side Channel Blowers
EP1729010A1 (en) * 2005-05-31 2006-12-06 ESAM S.p.A. Vacuum blower
US20070297894A1 (en) * 2006-06-12 2007-12-27 Sasikanth Dandasi Regenerative Vacuum Generator for Aircraft and Other Vehicles
JP4889419B2 (en) * 2006-09-15 2012-03-07 愛三工業株式会社 Wesco pump
EP2222725B1 (en) * 2007-12-27 2019-06-19 Univation Technologies, LLC Systems and methods for removing entrained particulates from gas streams
US9249806B2 (en) 2011-02-04 2016-02-02 Ti Group Automotive Systems, L.L.C. Impeller and fluid pump

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468246A (en) * 1947-01-09 1949-04-26 Linde Air Prod Co Rotary pump for liquefied gases
US3095820A (en) * 1960-02-29 1963-07-02 Mcculloch Corp Reentry rotary fluid pump
DE1403579A1 (en) * 1961-03-04 1969-07-17 Obermaier & Cie Turbo blower
US3592566A (en) * 1969-07-17 1971-07-13 Gen Electric Electric vacuum cleaner with turbine-type suction pump
DE2135093B2 (en) * 1971-07-14 1974-06-06 Fa. J. Eberspaecher, 7300 Esslingen Side channel blowers, in particular for fuel-operated heating devices
IT948077B (en) * 1972-01-03 1973-05-30 Pumpen & Verdichter Veb K LATERAL CHANNEL BLOWER
DE2334478A1 (en) * 1973-07-06 1975-01-23 Siemens Ag Rotor seal for rotary lateral duct compressor - has lip-shaped annulus on housing wall axially extending into rotor ring groove
DE2244933A1 (en) * 1972-09-13 1974-03-21 Siemens Ag FLOW MACHINE, IN PARTICULAR SIDE CHANNEL COMPRESSORS
DE2405112A1 (en) * 1974-02-02 1975-08-07 Wilhelm Dickow Pumpenfabrik Oh Guard for pump with running wheel - consists of plastic rings between wheel and discs
DE2713091C3 (en) * 1977-03-24 1979-12-13 Siemens Ag, 1000 Berlin Und 8000 Muenchen Side channel compressor with at least one ball bearing arranged on the housing cover of the side channel compressor
DE2738208B1 (en) * 1977-08-24 1978-05-11 Siemens Ag Side channel blower
SU724800A1 (en) * 1978-05-19 1980-03-30 Самостоятельное Конструкторско- Технологическое Бюро По Проектированию Приборов И Аппаратов Из Стекла Vortex-type machine
SU1262117A2 (en) * 1985-03-14 1986-10-07 Войсковая Часть 74242 Impeller pump

Also Published As

Publication number Publication date
DE8704066U1 (en) 1988-07-14
EP0286824A1 (en) 1988-10-19
DE3860630D1 (en) 1990-10-25
US4806073A (en) 1989-02-21

Similar Documents

Publication Publication Date Title
EP0286824B1 (en) Regenerative compressor
DE3021349A1 (en) OIL SEAL ARRANGEMENT FOR A TURBOCHARGER
DE3704755A1 (en) Combine harvester with a device for distributing the GRAIN-SPREAD MIXTURE
DE4105336A1 (en) SUCTION CLEANING TOOL
DE599519C (en) Centrifugal friction fan, the rotor of which consists of adjacent discs
DE6918918U (en) CROSS-FLOW FAN FOR THE CLEANING DEVICE OF A COMBINE.
DE2833220A1 (en) DEVICE FOR COOLING GAS TURBINES
DE2717610C3 (en) Device for separating dust-like parts from an air stream
DE3622056C2 (en)
DE2748944A1 (en) METHOD AND DEVICE FOR CLEANING FILTERS
DE1274404B (en) Separator for cleaning intake air
DE3330199A1 (en) FEDER BLOWER FOR TEXTILE FIBER GOODS
DE1507829A1 (en) Rotatable air purifier
DE2363190A1 (en) AIR CLEANER
AT403013B (en) ROTOR FOR A DYNAMIC FILTER SYSTEM
DE102020119368A1 (en) cutting device
DE541445C (en) Separation and dedusting device for pneumatic conveyor systems, especially for fibrous material
DE970265C (en) Centrifugal pump for conveying thick matter, especially mortar, concrete, sandy water and the like. like
DE2809597A1 (en) Radial air circulation fan for room - has central straight radial fixed blades and curved enclosing rotor blades
DE959583C (en) Changeable impeller for radial blower
LU102841B1 (en) Arrangement comprising an impeller and a cutting head for solid-loaded liquid of a pump
DE69312409T2 (en) Device for dedusting a gas stream
DE505889C (en) Device for removing dust and material particles from air, furnace duct gases and other gases, in which the gases are guided through curved ducts
DE1428028C3 (en) Separator fan
EP4108935A1 (en) Cutting ring for a pump for a liquid containing solids

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: 19881108

17Q First examination report despatched

Effective date: 19900312

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: 3860630

Country of ref document: DE

Date of ref document: 19901025

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

Ref country code: DE

Payment date: 19930618

Year of fee payment: 6

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

Ref country code: GB

Payment date: 19940218

Year of fee payment: 7

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

Ref country code: FR

Payment date: 19940317

Year of fee payment: 7

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

Ref country code: DE

Effective date: 19941201

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

Ref country code: GB

Effective date: 19950307

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

Effective date: 19950307

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: 19951130

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

Effective date: 20050307