EP0072275B1 - Pompe à vide sèche à membrane - Google Patents

Pompe à vide sèche à membrane Download PDF

Info

Publication number
EP0072275B1
EP0072275B1 EP82401332A EP82401332A EP0072275B1 EP 0072275 B1 EP0072275 B1 EP 0072275B1 EP 82401332 A EP82401332 A EP 82401332A EP 82401332 A EP82401332 A EP 82401332A EP 0072275 B1 EP0072275 B1 EP 0072275B1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
pump
exhaust
control chamber
chamber
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
Application number
EP82401332A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0072275A1 (fr
Inventor
Robert Evrard
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT82401332T priority Critical patent/ATE26870T1/de
Publication of EP0072275A1 publication Critical patent/EP0072275A1/fr
Application granted granted Critical
Publication of EP0072275B1 publication Critical patent/EP0072275B1/fr
Expired 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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/06—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having tubular flexible members
    • F04B45/073—Pumps having fluid drive
    • F04B45/0736—Pumps having fluid drive the actuating fluid being controlled by one or more valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/14—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high vacuum

Definitions

  • the present invention relates to a dry membrane vacuum pump, more particularly intended to constitute at least one stage of a vacuum pump for obtaining a vacuum free of oil contamination.
  • Oil diffusion pumps are therefore more and more often replaced by ionic, cryogenic, etc. pumps.
  • a diaphragm pump whether used as a vacuum pump or as a compressor, has a tight elastic membrane stretched between two rigid bodies. There is thus formed, on either side of the membrane, on the one hand a pumping chamber into which open orifices provided with valves for suction and discharge, and on the other hand a control chamber where the the pressure is varied cyclically to generate the pumping movement of the membrane.
  • French patent 581223 for example describes such a pump.
  • the limit vacuum obtained by such pumps in single-stage systems is of the order of at least 10 4 Pascals. This relatively high limit is due, among other things, to the use of valves. In particular, the conductance of an intake valve decreases with the pressure of the vacuum system and tends towards zero.
  • the valves are also generating what is called a "dead volume"; at the end of each cycle, a small volume of pumped gas is trapped at the discharge pressure and returns to the emptied enclosure. Finally, the movement of the membrane is obtained by rigid coupling with a mechanical device. The flexibility of the membrane is thus considerably reduced, which further increases the dead volume. But above all the discharge conductance for the parts remote from the discharge valve becomes very low. A certain quantity of gas is then trapped at high pressure, deforming the membrane and considerably increasing the dead volume.
  • the subject of the present invention is a means of obtaining a "clean" primary vacuum with a diaphragm pump, corresponding to a much lower limit pressure than that obtained with existing devices.
  • the discharge orifices communicate via valves with a capacity maintained at a pressure below atmospheric pressure by an auxiliary vacuum pump; on the other hand it includes a distribution mechanism for alternately communicating the control chamber with the atmosphere and with the suction of an auxiliary vacuum pump.
  • the same auxiliary vacuum pump is used both to maintain a vacuum downstream of the discharge valve, and to create the vacuum applied cyclically to the control chamber.
  • the auxiliary pump intended to create a vacuum in the control chamber, is integrated into the main pump. It is essentially constituted by a second thick elastic membrane, stretched between the second rigid body and the first membrane.
  • a distribution mechanism allows on the one hand to communicate alternately the space between the second rigid body and the second membrane with a source of compressed air and the atmosphere, and on the other hand, to put the control chamber , that is to say here the space between the two menbranes, at the atmospheric pressure or isolate it.
  • the admission of atmospheric air into the control chamber coincides with the admission of compressed air under the second membrane: during this simultaneous admission, the first membrane is pressed against the first rigid body: the main pump delivers. At the same time, the second membrane is pressed against the first.
  • the control chamber is isolated while the compressed air under the second membrane escapes, the second membrane retracts, creating a vacuum under the first which also retracts: the main pump sucks.
  • Figures 1 and 2 show in simplified manner, and in longitudinal section, a pump produced according to the invention provided with an external auxiliary vacuum pump.
  • Figure 1 shows the pump at the end of the suction phase;
  • Figure 2 at the end of the delivery phase.
  • Figures 3 and 4 show an alternative embodiment of the dispensing mechanism, applied to the pump of Figures 1 and 2, respectively in the suction and discharge control position.
  • Figures 5 and 8 show in the same conditions as in Figures 1 and 2, respectively at the end of suction and at the end of delivery, an alternative embodiment with an auxiliary control pump integrated.
  • the pump is constituted by a first hollow rigid body 1 whose inner wall is in the form of two trunks of cones joined by their bases.
  • the body 1 has a suction orifice 2 in an end region with a small internal diameter, while the discharge orifice 3 is located in the central part with a large internal diameter.
  • the suction port 2 is connected by a tube 4 to the enclosure 5 in which we want to create a vacuum.
  • the discharge orifice 3 is provided with a valve 7 constituted by a simple elastic sheet, one end of which is fixed at 8 to the body 1, while its other end is free to press against the body or to move away from it according to pressure variations on either side of the body.
  • the valve 7 is inside a small delivery chamber 9 provided with a nozzle 10.
  • the center of the hollow body 1 is occupied by a cylindrical body 11 covered with a waterproof tubular elastic membrane 12, for example in a product sold under the trademark "NEOPRENE".
  • the natural internal diameter of the membrane 12 is less than the external diameter of the body 11, so that it is applied under tension against the body 11.
  • the membrane 12 is distended at each end to enclose an outer flange 13; each flange 13, by tightening the screws 14 engaged on the body 11, tightly blocks each end of the membrane 12 on the end faces of the body 1.
  • the chamber 15 between the membrane 12 and the body 1 constitutes the actual pumping chamber, where both the suction and discharge orifices 2 and 3 open.
  • the chamber 16 between the membrane 12 and the body 11 constitutes the control chamber under the action of a distribution system to which it is connected by the conduit 17.
  • the chamber 16 is in fact cut into two parts , each at one end of the body 11, but connected by the balancing duct 18.
  • the conduit 17, via the T-conduit 19, is connected to two two-way solenoid valves 20 and 21.
  • the other path of the solenoid valve 20 communicates directly with the atmosphere.
  • the other path of the solenoid valve 21 is connected by the conduit 22 to an auxiliary vacuum pump 23.
  • a tube 24 connects the nozzle 10 of the discharge chamber 9 to a nozzle 25 on the conduit 22, in the vicinity of the solenoid valve 21.
  • the type and connection of electrical supply to the coils of the solenoid valves 20 and 21 are such that they operate in opposition, that is to say that one is necessarily open while the other is closed, and vice versa.
  • the solenoid valve 20 is normally closed and the solenoid valve 21 normally open, and the two coils are supplied in parallel from a line 26, by means of an oscillating relay 27 which cyclically energizes and cuts power to both coils.
  • the first phase of evacuating the enclosure 5 can be ensured by the conventional auxiliary pump 23.
  • the solenoid valves 20 and 21 are de-energized with the oscillating relay 27 in the rest position as shown in FIG. 1.
  • the pump 23 sucks then directly into the enclosure 5 through the tube 4, the orifice 2, the chamber 15, the orifice 3, the valve 7 open, and the tube 24; at the same time it maintains the chamber 18 in depression, which allows the membrane 12 to remain pressed against the body 11 by its own elasticity.
  • the pump according to the invention is actuated by activating the relay 27.
  • the relay switches to take the position shown in FIG. 2 the coils of the solenoid valves 20 and 21 are powered; 21 is closed and 20 open.
  • the atmospheric pressure is then established in the chamber 16 and the membrane 12 is inflated from the inside to come to be pressed against the internal biconical face of the body 1.
  • the membrane firstly closes the suction orifice 2 , then the progressive reduction in volume of the chamber 18 flushes out by compressing the gas it contained towards the discharge orifice 3.
  • the combined action of the compression upstream of the valve 7 and of the vacuum maintained continuously in downstream by the auxiliary pump 23 is sufficient to lift the valve and expel the gas towards the pipe 24.
  • the valve 7 although constituted by a simple elastic sheet, functions in fact like a complex valve with pneumatic control: at the start of the intake phase the solenoid valve 21 opens and the air return solenoid valve 20 closes. The air accumulated in the chamber 18 under the membrane 12 spreads in the auxiliary circuit 22-24 and the pressure downstream of the discharge valve 7 rises suddenly. This valve is thus pressed energetically on its seat and the "return flow" is practically canceled in the critical intake phase. The downstream pressure, continuously pumped by the auxiliary pump 23 will then decrease continuously. At the start of the compression phase, the air re-entry valve 20 opens while the valve 21 closes to isolate the auxiliary pumping circuit downstream from the valve.
  • the pressure in the discharge chamber 9 therefore continues to decrease during compression in the chamber 15 and the gas can be easily evacuated through the valve 7 made soft by a minimum plating force.
  • This optimization of the operation of the discharge valve eliminates the drawbacks of "stiff" discharge valves as they exist in conventional devices.
  • the membrane 12 may have a smaller thickness at the ends.
  • the inlet 2 is closed off at an earlier point in the compression phase.
  • the tubular membrane 12 with a diameter less than the outside diameter of the cylinder 11 is here still taut. It therefore retracts for a reasonable vacuum between it and the cylinder 11, even if the vacuum between it and the body 1 is already very high.
  • the symmetrical shape of 1, with the delivery port in the center ensures that at the end of compression the residual delivery cavity is exactly opposite the corresponding port 3. The real "dead volume" is thus reduced to a minimum.
  • the rate of pressure increase in the chamber 15, between the suction position of Figure 1 and the discharge position of Figure 2 is of the order of at least 500.
  • the new pump could thus play the role of a "boost pump”. Its coupling with existing coarse vacuum dry pumps transforms them into high performance pumps and divides the limit vacuum by a factor of at least 500.
  • the pumping speed depends essentially on the frequency of the intake cycle, that is to say on the pumping speed of the auxiliary pump.
  • the vacuum required for operation is of the order of 2.10 4 Pascals or more, and corresponds to a pressure range where the pumping speed of conventional diaphragm pumps is high.
  • the "boost pump” not only considerably improves the limit pressure, but allows the conventional pump to be used under optimum pressure conditions for pumping speed.
  • FIGS. 3 and 4 show in a simplified manner another device operating purely pneumatically and performing the same functions as the combination of two solenoid valves 20 and 21.
  • the device which constitutes a vacuum dynamometer with piston and return spring, comprises a tubular body in bronze 30, closed by two bottoms 31 and 32.
  • a piston 33 slides freely in the bore of the body 30, which it seals in two chambers 34 and 35.
  • the piston 33 is returned by a tension spring 36 until 'in a position in abutment on a shoulder 37.
  • the conduit 17 of the chamber 16 is connected by a U-shaped conduit 39 to the inner chamber 34 of the body 30.
  • a conduit 40 connected to the conduit 22 for connection with the auxiliary pump 23.
  • An orifice 41 also opens facing the other branch of the conduit 39 to communicate the chamber 34 with the outside.
  • the bottom 31 has an exhaust valve 43 and a calibrated orifice 44 between the chamber 35 and the outside.
  • the internal bent conduit 45 opens onto the lateral face of the piston 33, a usual guide not shown being provided to prevent the latter from rotating during its longitudinal stroke, so that the lateral outlet of the conduit 45 passes in front of the branches of the conduit 39.
  • the device is equivalent to the two solenoid valves 20 and 21 in their positions in FIG. 1.
  • the chamber 16 communicates with the auxiliary pump via 17, 39, 34 40 and 22, while the communication with the atmosphere is cut off by the piston 33 which closes the orifice 41.
  • the vacuum generated in the chamber 34 causes the suction of the piston 33 to the left, against the return action of the spring 36. But this movement is slowed down by the calibrated orifice 44 which does not lets air in very gradually into chamber 35.
  • the piston cuts the communication with the atmosphere of the chamber 16 and re-establishes the vacuum therein of the pump 23, which corresponds to a new suction cycle.
  • FIGS. 5 and 6 for an alternative embodiment with an integrated control auxiliary pump.
  • the general geometry is the same, but the central cylindrical body 11 is surrounded by another thick waterproof elastic membrane 50, of tubular shape and hermetically tightened by its ends on the body 11 by means of collars 51.
  • the conduit 54 At rest when the solenoid valve coil is not supplied, as shown in Figure 5, the conduit 54 is in communication with the atmosphere. When the coil is energized, the solenoid valve communicates the conduit 54 with the conduit 57 connected to a compressed air distribution 58, autonomous compressor or distribution network.
  • the electrical supply connection of the solenoid valves 20 and 55 is such that when the valve 20 is closed the valve 55 puts the conduit 54 into the atmosphere, and when the valve 20 is open the valve 55 supplies the conduit 54 and the chamber 52 in compressed air.
  • the coils of the solenoid valves 20 and 55 are supplied in parallel from a line 26, by means of an oscillating relay 27 which cyclically energizes and cuts the supply of the two coils.
  • the delivery chamber 9 downstream from the valve 7 is maintained in permanent vacuum; this is achieved here by connecting its nozzle 10 to a compressed air ejector 60.
  • the atmospheric pressure established by the opening of the valve 20 in the chamber-16 drives the membrane 12 on the internal face of the body 1.
  • the compressed air brought into the chamber 52 by the valve 55 inflates the membrane 50 which comes into contact with the membrane 12 and minimizes the volume of the chamber 16.
  • the switching of the relay 27 then cuts the supply of the coils of the two solenoid valves 20 and 55 which take the positions represented in FIG. 5.
  • the setting in the atmosphere of the chamber 52 lets the membrane 50 return to its normal position to come to be pressed against the body 11. By its removal the membrane 50 creates a strong vacuum in the chamber 16 under the membrane 12 because the closed valve 20 prevents air from entering it.
  • the depression in the chamber 16 in turn allows the membrane 12 to retract towards the membrane 50 and the body 11, which causes a strong depression in the pumping chamber 15 and the suction as soon as the orifice 2 is uncovered .
  • the internal membrane 50 and its inflating operation with compressed air or deflating plays the same role as the auxiliary pump 23 of the first variant to create the vacuum under the main membrane 12 during the suction phase.
  • the vacuum chamber 9 is kept under vacuum by the independent ejector 60.
  • the pumping speed depends essentially on the flow rate of the supply circuit used.
  • the intake volume is much larger than in mechanically coupled diaphragm pumps and the pumping speed may be increased by death.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP82401332A 1981-07-24 1982-07-16 Pompe à vide sèche à membrane Expired EP0072275B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401332T ATE26870T1 (de) 1981-07-24 1982-07-16 Membranpumpe fuer oelfreies vakuum.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114489 1981-07-24
FR8114489A FR2510203A1 (fr) 1981-07-24 1981-07-24 Pompe primaire seche a membrane

Publications (2)

Publication Number Publication Date
EP0072275A1 EP0072275A1 (fr) 1983-02-16
EP0072275B1 true EP0072275B1 (fr) 1987-04-29

Family

ID=9260865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401332A Expired EP0072275B1 (fr) 1981-07-24 1982-07-16 Pompe à vide sèche à membrane

Country Status (5)

Country Link
US (1) US4452572A (enrdf_load_stackoverflow)
EP (1) EP0072275B1 (enrdf_load_stackoverflow)
AT (1) ATE26870T1 (enrdf_load_stackoverflow)
DE (1) DE3276188D1 (enrdf_load_stackoverflow)
FR (1) FR2510203A1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4789016A (en) * 1985-10-25 1988-12-06 Promation Incorporated Container filling apparatus
US5273406A (en) * 1991-09-12 1993-12-28 American Dengi Co., Inc. Pressure actuated peristaltic pump
US5876190A (en) 1996-01-03 1999-03-02 Buchi Labortechnik Ag Vacuum membrane pump and a head portion for a vacuum membrane pump
GB2314591B (en) * 1996-06-26 1999-10-27 Poss Limited Flexible tube pump
ATE468054T1 (de) 2000-12-22 2010-06-15 Draeger Medical Systems Inc Schaukelgerät für kleinkinder
US6572259B2 (en) * 2001-04-20 2003-06-03 Burnett Lime Co., Inc. Apparatus and method to dispense a slurry
EP2379699B1 (en) * 2008-12-19 2017-12-13 Stobbe Tech A/S Device for industrial biolayer cultivation
NL1038329C2 (en) * 2010-10-25 2012-04-26 Lely Patent Nv Milking installation with milk pump.
US8951419B2 (en) 2010-12-17 2015-02-10 Burnett Lime Company, Inc. Method and apparatus for water treatment
CA2869094C (en) * 2012-01-10 2020-06-02 Kci Licensing, Inc. Systems and methods for delivering fluid to a wound therapy dressing
CN103075328A (zh) * 2013-01-25 2013-05-01 沈阳大学 水动隔膜泵
EP4039288A1 (en) * 2016-03-18 2022-08-10 DEKA Products Limited Partnership Pressure control gaskets for operating pump cassette membranes
CN115820389A (zh) * 2022-12-02 2023-03-21 上海东富龙医疗装备有限公司 交替切向流过滤装置和灌流培养系统

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE203854C (enrdf_load_stackoverflow) *
FR581223A (fr) * 1924-04-19 1924-11-25 Pompe à diaphragme élastique
FR689893A (fr) * 1929-04-19 1930-09-12 Compresseur à membrane
US2494529A (en) * 1945-02-23 1950-01-10 Axel M Wirtanen Vacuum rupture operated pump
CH284883A (de) * 1950-11-29 1952-08-15 Oerlikon Maschf Vakuumpumpe.
US2970546A (en) * 1958-04-23 1961-02-07 Howard T White Fluid pressure systems
US3824792A (en) * 1971-05-14 1974-07-23 Bendix Corp Vacuum intensified brake booster system
IN150056B (enrdf_load_stackoverflow) * 1977-09-12 1982-07-10 Tudor Ab
IT1117080B (it) * 1977-09-21 1986-02-10 Bosio Roberto Pompa atta a realizzare una circolazione sanguigna artificiale

Also Published As

Publication number Publication date
FR2510203A1 (fr) 1983-01-28
US4452572A (en) 1984-06-05
DE3276188D1 (en) 1987-06-04
FR2510203B1 (enrdf_load_stackoverflow) 1984-01-06
ATE26870T1 (de) 1987-05-15
EP0072275A1 (fr) 1983-02-16

Similar Documents

Publication Publication Date Title
EP0072275B1 (fr) Pompe à vide sèche à membrane
EP0148480B1 (fr) Vanne dont l'ouverture fonctionne a la depression
FR2591287A1 (fr) Groupe compresseur a vis et appareil integre a separateur d'huile et valve a tiroir.
FR2882041A1 (fr) Dispositif pour le transport de poudre de revetement et methode pour le transport de poudre avec le dispositif de transport.
CH664195A5 (fr) Pompe a jet.
CA2042567C (fr) Dispositif de compression, en particulier pour le remplissage sous pression d'un reservoir
CH639004A5 (fr) Dispositif de commande d'un sechoir d'air comprime.
CA2030982A1 (fr) Dispositif de compression et d'accumulation d'air
FR2713960A1 (fr) Système d'isolation séquentielle d'une haute tension au moyen de joints dynamiques.
FR2656460A1 (fr) Dispositif d'isolation electrique formant element de conduit et installation comportant un tel dispositif.
FR2652426A1 (fr) Detendeur de bouteille de gaz.
FR2539822A1 (en) Dry primary piston pump
FR2573960A1 (fr) Dispositif homogeneiseur equipe d'un groupe obturateur perfectionne de commande de la distribution du produit, pour machines de fabrication de creme fouettee
EP0015180A1 (fr) Pompe et procédé de pompage d'un fluide
FR2564525A1 (fr) Pompe doseuse pour produits pateux ou charges de substances fragiles
EP1236869A1 (fr) Dispositif pour introduire un mélange carbure dans une chambre de combustion d'un moteur - combustion interne, notamment d'un moteur - deux temps
FR2733406A1 (fr) Perfectionnement pour installation d'aspiration
FR2800721A1 (fr) Dispositif de prehension et de deplacement d'un objet presentant une face partiellement plane
CA2520806C (fr) Dispositif d'aspiration pneumatique
FR2621390A1 (fr) Dispositif de transfert d'une quantite determinee de fluide entre une conduite et une derivation
FR2969937A1 (fr) Aspirateur de gaz d'echappement de vehicule a moteur
FR2487923A1 (fr) Pompe de circulation electromagnetique
FR2478220A1 (fr) Pompe et procede de pompage d'un fluide
EP0165282B1 (fr) capteur pneumatique pour la commande de cycles pneumatiques
EP2112899A2 (fr) Dispositif d aspiration a plusieurs pompes

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

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

17P Request for examination filed

Effective date: 19830729

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

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

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

Ref country code: NL

Effective date: 19870429

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;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: 19870429

Ref country code: AT

Effective date: 19870429

REF Corresponds to:

Ref document number: 26870

Country of ref document: AT

Date of ref document: 19870515

Kind code of ref document: T

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

Ref country code: SE

Effective date: 19870430

REF Corresponds to:

Ref document number: 3276188

Country of ref document: DE

Date of ref document: 19870604

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: 19870731

Ref country code: LI

Effective date: 19870731

Ref country code: CH

Effective date: 19870731

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
BERE Be: lapsed

Owner name: EVRARD ROBERT

Effective date: 19870731

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

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: 19880331

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee
26N No opposition filed
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: GB

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

Effective date: 19881121

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

Ref country code: DE

Payment date: 19890217

Year of fee payment: 7

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

Ref country code: BE

Effective date: 19890731

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

Ref country code: DE

Effective date: 19900403