EP0451085B1 - Schraubenspindelpumpe - Google Patents
Schraubenspindelpumpe Download PDFInfo
- Publication number
- EP0451085B1 EP0451085B1 EP91710004A EP91710004A EP0451085B1 EP 0451085 B1 EP0451085 B1 EP 0451085B1 EP 91710004 A EP91710004 A EP 91710004A EP 91710004 A EP91710004 A EP 91710004A EP 0451085 B1 EP0451085 B1 EP 0451085B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spindle
- pressure
- screw rotor
- rotor pump
- angle
- 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
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/0042—Systems for the equilibration of forces acting on the machines or pump
- F04C15/0049—Equalization of pressure pulses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
Definitions
- the invention relates to a screw pump with a Drive spindle and at least one spindle according to the preamble of claim 1.
- EP-A-209 984 can be one Screw pump can be removed, the drive spindle with their cantilevered thread in thread formations of some Spindles engages and form several tight chambers should.
- at least one is circumferential Channel provided around the periphery of the spindles so that the last of the tight chambers at an outlet with this - short its release by the chamber - partly via the canal communicates.
- US-A-29 22 377 indicates as an error Screw pumps have a high pressure, temperature and Noise development as a result of the discharge closed pockets. Then one is described Drive spindle with itself at an angle of, for example 30 ° tapering cross-section at the end of the print in the area of a adapted desk surface of the housing. This arrangement is said to those closed pockets by making one Prevent sealing edge over the entire length of the spindle.
- FR-A-799903 describes a liquid pump with a Drive spindle and a spindle, which in one Recess of a surrounding housing between one Pressure chamber and two suction rooms flanking these are.
- the spindle gears are as sliding partitions disclosed, between each of which a pump chamber is formed. These partitions move away Pressure chamber gradually from the surrounding housing wall, so that the tightness of a pump chamber in relation to Pressure space is reduced.
- That outer wall and that inner partitions move away towards the pressure side the pump from each other at individual points or on the entire length, and the tightness of the pump chamber / s decreases towards the pressure chamber gradually in the direction of the latter is the eight-shaped wall at the outer end of one or each individual turn of the spindle gear completely or partly cut out in a funnel shape, or - differently said - the cylindrical interface of one or both Coils have a conical shape.
- a screw pump leads to the solution of this task according to the teaching of patent claim 1;
- the conical surface of the Outer diameter of the pressure side, conically turned Profile outlet of the spindle has one and the Inclination angle below 10 °.
- Of particular importance for the reduction in pulsation is extremely flat Conical surface with an inclination angle of less than 5 °, preferred even below 3 °.
- This bevel on the pressure side causes the appropriate Point in time a gradual and defined opening of the pressure-side chamber takes place; so that through the Closing the suction side resulting volume flow or Pressure increase can be largely compensated.
- the Initial pulsation is significantly reduced.
- this can also be done suction-side profile end with such a flat Be conical surface provided, however, the axial Length of the last-mentioned conical surface should be less than the axial length of the pressure-side cone surface.
- the housing 12 is both on the pressure side and on the suction side Formation of a pressure chamber 20 and a suction chamber 22 each with a pump cover 25 or 24 closed.
- the through the pressure-side pump cover 25 guided drive spindle 14 is in Area of a through hole 26 with an axial thrust compensation piston 28 provided and with a bearing 30 in one Lid attachment 32 additionally supported. In the latter there is also a shaft seal 34.
- the interior 36 of the lid attachment 32 is from the delivery pressure relieved; the liquid entering from the pressure chamber 20 is over discharged a relief channel 38, which via a Connection bore 40 of the housing 12 in the suction chamber 22 flows into.
- Fig. 2 shows that the drive spindle 14 - the profile length - is turned conically at their ends, wherein the length of the pressure-side taper 42 e, the length of the with that end face 44 by an amount i protruding suction cone 42 s with e l , the remaining cylinder length of the drive spindle 14 between the conical surfaces 43, 43 s with q, the pitch angle of the thread 15 of the drive spindle 14 - or the spindle 16 - only partially indicated in FIG. 2 - with t and the pitch with s are.
- the pressure-side cone angle w or the suction-side cone angle w l is preferably 2 °.
- the length adjustment of the entire system is chosen so that during part of the funding period in FIG. 3 reproduced more of sealing lines is generated; this means, an increase from Qvmax to Qvmin.
- the pulsation pattern is thus changed by attaching the described conical surface 43 to the pressure-side spindle end, which leads to a decrease in Qv and -Q kom .
- the extension of the cross-sectionally inclined conical surface 43 has the effect that, on the one hand, the pressure side opens earlier, and on the other hand, the cross-sections become continuously larger during opening. It may be sufficient to provide the pressure side with the cone 42 and to leave the spindle end on the suction side cylindrical.
- the operating system for the three-spindle screw pump 10 shown can be described as follows: On the basis of a certain number of chambers n, which is a measure of the internal pressure build-up in the pump, the ratio of length to slope - ie a / s - represents an analogue quantity for the geometric implementation; the greater this ratio, the smaller the pressure increase per unit length.
- a 1 + (2. N -1).
- the pre-factor x is a measure of the pre-compression, which in the other only depending on the profile for values above 0.1 - 0.15 occurs.
- the pressure-side cone must 42 to that dimension x - that is, to the pre-compression achieved - be coordinated.
- the length e chosen such that for the normal case
- the cone 42 s on the suction side generally allows the closing characteristic to be adapted, as is shown at A 'in FIG. 2.
- This cone 42 s must be precisely matched to the pressure-side cone 42 on the basis of a defined length ratio a / s.
- the length e l of the cone 42 s is expediently chosen to be smaller than the length e of the other cone 42.
- the length e of the pressure-side cone 42 is to be made smaller overall.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Reciprocating Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Supercharger (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
- Fig. 1:
- einen Längsschnitt durch eine Schraubenspindelpumpe;
- Fig. 2:
- einen vergrößerten Teilschnitt durch die Schraubenspindelpumpe;
- Fig. 3:
- ein Diagramm zur Druckpulsation bzw. Volumenstrompulsation der Schraubenspindelpumpe.
- A:
- Ausgangspulsation;
- B:
- Pulsation bei Nutzung des Vorkompressionseffektes;
- Qv:
- Verlustvolumenstrom;
- Qkom:
- Kompressionsvolumenstrom.
Unter Zugrundelegung einer bestimmten Kammerzahl n, welche ein Maß für den pumpeninternen Druckaufbau ist, stellt das Verhältnis von Länge zu Steigung --, d.h. also a/s -- eine analoge Größe für die geometrische Realisierung dar; je größer dieses Verhältnis ist, umso kleiner wird der Druckanstieg je Längeneinheit.
x ein Vorfaktor mit 0,15 < x < 0,4 ist, und
n die Anzahl der im Mittel wirkenden Kammern beschreibt.
Claims (5)
- Schraubenspindelpumpe mit einer Antriebsspindel und wenigstens einer Laufspindel, die in einer Ausnehmung eines sie umgebenden Gehäuses zwischen einem Saugraum und einem Druckraum gelagert sind, wobei der druckseitige Profilauslauf am Außendurchmesser konisch angedreht ist,
dadurch gekennzeichnet,
daß der Neigungswinkel (w) der Konusfläche (43) der Spindel (14, 16) unter 10° liegt. - Schraubenspindelpumpe, nach Anspruch 1, dadurch gekennzeichnet, daß die Spindel (14, 16) an ihrem saugseitigen Ende eine Konusfläche (43s) mit einem Neigunswinkel (wl) aufweist.
- Schraubenspindelpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Neigungswinkel (w, wl) unter 5° liegt.
- Schraubenspindelpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Neigungswinkel (w,wl) unter 3° liegt.
- Schraubenspindelpumpe nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die axiale Länge (e) der druckseitigen Konusfläche (43) größer ist als die axiale Länge (el) der saugseitigen Konusfläche (43s).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96105318A EP0727581B1 (de) | 1990-03-08 | 1991-03-07 | Schraubenspindelpumpe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4007273 | 1990-03-08 | ||
DE4007273 | 1990-03-08 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96105318A Division EP0727581B1 (de) | 1990-03-08 | 1991-03-07 | Schraubenspindelpumpe |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0451085A2 EP0451085A2 (de) | 1991-10-09 |
EP0451085A3 EP0451085A3 (en) | 1992-07-08 |
EP0451085B1 true EP0451085B1 (de) | 1998-08-12 |
Family
ID=6401666
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91710004A Expired - Lifetime EP0451085B1 (de) | 1990-03-08 | 1991-03-07 | Schraubenspindelpumpe |
EP96105318A Expired - Lifetime EP0727581B1 (de) | 1990-03-08 | 1991-03-07 | Schraubenspindelpumpe |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96105318A Expired - Lifetime EP0727581B1 (de) | 1990-03-08 | 1991-03-07 | Schraubenspindelpumpe |
Country Status (6)
Country | Link |
---|---|
US (1) | US5123821A (de) |
EP (2) | EP0451085B1 (de) |
JP (1) | JP3036874B2 (de) |
KR (1) | KR0177815B1 (de) |
AT (2) | ATE169721T1 (de) |
BR (1) | BR9100993A (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI104440B (fi) * | 1995-06-22 | 2000-01-31 | Kone Corp | Ruuvipumppu ja ruuvipumpun ruuvi |
US6623262B1 (en) | 2001-02-09 | 2003-09-23 | Imd Industries, Inc. | Method of reducing system pressure pulsation for positive displacement pumps |
GB0226529D0 (en) * | 2002-11-14 | 2002-12-18 | Dana Automotive Ltd | Pump |
US8096288B2 (en) * | 2008-10-07 | 2012-01-17 | Eaton Corporation | High efficiency supercharger outlet |
DE102017210767B4 (de) * | 2017-06-27 | 2019-10-17 | Continental Automotive Gmbh | Schraubenspindelpumpe, Kraftstoffförderaggregat und Kraftstofffördereinheit |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2652192A (en) * | 1947-06-13 | 1953-09-15 | Curtiss Wright Corp | Compound-lead screw compressor or fluid motor |
US2952216A (en) * | 1956-03-13 | 1960-09-13 | Wildhaber Ernest | Rotary screw unit for displacing fluid |
US2922377A (en) * | 1957-09-26 | 1960-01-26 | Joseph E Whitfield | Multiple arc generated rotors having diagonally directed fluid discharge flow |
CH390690A (de) * | 1959-02-23 | 1965-04-15 | Imo Industri Ab | Schraubenpumpe |
FR1243471A (fr) * | 1959-08-31 | 1960-10-14 | Perfectionnements aux rotors pour pompes, moteurs, compresseurs, ventilateurs, compteurs et autres dispositifs similaires | |
US3103894A (en) * | 1960-02-18 | 1963-09-17 | Laval Turbine | Screw pump |
DE2033201C3 (de) * | 1970-07-04 | 1979-02-01 | Allweiler Ag | Schraubenspindelmotor oder -pumpe |
SE383774B (sv) * | 1975-04-02 | 1976-03-29 | Imo Industri Ab | Skruvpump |
JPS5238615A (en) * | 1975-09-22 | 1977-03-25 | Mayekawa Mfg Co Ltd | Screw compressor |
JPS5936116B2 (ja) * | 1976-08-07 | 1984-09-01 | 株式会社荏原製作所 | 流体機械 |
FR2538463B1 (fr) * | 1982-12-23 | 1985-06-21 | Dba | Machine volumetrique a vis coniques |
JPS61294178A (ja) * | 1985-06-24 | 1986-12-24 | Kawasaki Heavy Ind Ltd | ねじポンプ |
DE3815158A1 (de) * | 1988-05-04 | 1989-11-16 | Allweiler Ag | Verfahren zur verringerung der druckpulsation einer verdraengerpumpe, insbesondere einer schraubenspindelpumpe und eine danach ausgefuehrte schraubenspindelpumpe |
-
1990
- 1990-11-26 US US07/617,678 patent/US5123821A/en not_active Expired - Lifetime
-
1991
- 1991-03-07 AT AT91710004T patent/ATE169721T1/de not_active IP Right Cessation
- 1991-03-07 AT AT96105318T patent/ATE176717T1/de not_active IP Right Cessation
- 1991-03-07 EP EP91710004A patent/EP0451085B1/de not_active Expired - Lifetime
- 1991-03-07 EP EP96105318A patent/EP0727581B1/de not_active Expired - Lifetime
- 1991-03-08 BR BR919100993A patent/BR9100993A/pt not_active IP Right Cessation
- 1991-03-08 KR KR1019910003767A patent/KR0177815B1/ko not_active IP Right Cessation
- 1991-03-08 JP JP3069138A patent/JP3036874B2/ja not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
KR0177815B1 (ko) | 1999-04-15 |
EP0727581A1 (de) | 1996-08-21 |
EP0451085A3 (en) | 1992-07-08 |
ATE176717T1 (de) | 1999-02-15 |
EP0451085A2 (de) | 1991-10-09 |
JPH05231341A (ja) | 1993-09-07 |
US5123821A (en) | 1992-06-23 |
BR9100993A (pt) | 1991-11-05 |
KR910017081A (ko) | 1991-11-05 |
JP3036874B2 (ja) | 2000-04-24 |
EP0727581B1 (de) | 1999-02-10 |
ATE169721T1 (de) | 1998-08-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0301310B1 (de) | Axialkolbenmaschine in Schrägscheiben- oder Schrägachsenbauart mit Schlitzsteuerung und Druckausgleichskanälen | |
DE7625941U1 (de) | Rotorverdraengermaschine mit einer schnecke | |
DE69202399T2 (de) | Strömungsmaschine in Spiralbauweise. | |
DE3875417T2 (de) | Oelpumpe. | |
EP0451085B1 (de) | Schraubenspindelpumpe | |
DE69015795T2 (de) | Flügelzellen-Verdrängungspumpe. | |
DE3429935C2 (de) | Direktbetätigte Flügelzellenpumpe | |
EP0563661A1 (de) | Sichellose Innenzahnradpumpe mit radial beweglichen Dichtelementen zur Radialkompensation | |
DE69928172T2 (de) | Vacuumpumpe | |
DE2923796A1 (de) | Schraubenverdichter | |
EP2136041B1 (de) | Ventil zum Verschwenken einer Nockenwelle | |
EP2657525A2 (de) | Zahnradmaschine mit einer Axialdichtung, die sich in den Bereich der radialen Außenoberfläche des zugeordneten Lagerkörpers erstreckt | |
DE10245306A1 (de) | Extruder/Zahnradpumpen-Kombination | |
DE4107315C2 (de) | ||
EP1219841B1 (de) | Gleitlager, insbesondere für eine Zahnradpumpe | |
DE19519262C2 (de) | Schraubenverdichter mit einstellbarem Fördervolumen | |
DE2737659C2 (de) | Flügelzellen-Vakuumpumpe | |
EP0539673B1 (de) | Innenzahnradpumpe mit zwei Hohlrädern und einem gemeinsamen Ritzel | |
DE69606803T3 (de) | Schraubenpumpe und Schraubenrotor für eine Schraubenpumpe | |
DE2660714C2 (de) | ||
DE19609992A1 (de) | Zahnradmaschine | |
DE8514497U1 (de) | Hochdruckkolbenpumpe | |
DE102004021216A1 (de) | Hochdruck-Innenzahnradmaschine mit mehrfacher hydrostatischer Lagerung pro Hohlrad | |
EP1722104B1 (de) | Rotorpaar für Schraubenverdichter | |
DE9006233U1 (de) | Drehkolbenverdichter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
17P | Request for examination filed |
Effective date: 19920403 |
|
AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
17Q | First examination report despatched |
Effective date: 19930616 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
RBV | Designated contracting states (corrected) | ||
REG | Reference to a national code |
Ref country code: DE Ref legal event code: 8566 |
|
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 DK ES FR GB GR IT LI LU 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: 19980812 Ref country code: GR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19980812 Ref country code: FR 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: 19980812 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19980812 |
|
REF | Corresponds to: |
Ref document number: 169721 Country of ref document: AT Date of ref document: 19980815 Kind code of ref document: T |
|
XX | Miscellaneous (additional remarks) |
Free format text: TEILANMELDUNG 96105318.8 EINGEREICHT AM 03/04/96. |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19981005 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK 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: 19981112 |
|
EN | Fr: translation not filed | ||
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990307 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990331 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990331 Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19990331 |
|
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 | ||
BERE | Be: lapsed |
Owner name: ALLWEILER A.G. Effective date: 19990331 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20000222 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20000320 Year of fee payment: 10 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 20000323 Year of fee payment: 10 |
|
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: 20010307 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010307 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010308 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20010307 |
|
EUG | Se: european patent has lapsed |
Ref document number: 91710004.2 |
|
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: 20050307 |