EP0352215B1 - Outil de forage - Google Patents

Outil de forage Download PDF

Info

Publication number
EP0352215B1
EP0352215B1 EP89710056A EP89710056A EP0352215B1 EP 0352215 B1 EP0352215 B1 EP 0352215B1 EP 89710056 A EP89710056 A EP 89710056A EP 89710056 A EP89710056 A EP 89710056A EP 0352215 B1 EP0352215 B1 EP 0352215B1
Authority
EP
European Patent Office
Prior art keywords
spiral
drilling tool
tool according
transport spiral
grooves
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
EP89710056A
Other languages
German (de)
English (en)
Other versions
EP0352215A2 (fr
EP0352215A3 (en
Inventor
August Haussmann
Wolfgang Dipl.-Ing. Peetz
Bernhard Moser
Bernd Wessbecher
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.)
Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Robert Bosch Power Tools GmbH
Original Assignee
Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Hawera Probst GmbH
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 Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG, Hawera Probst GmbH filed Critical Hawera Probst Hartmetall Werk Zeugfabrik Ravensburgh KG
Publication of EP0352215A2 publication Critical patent/EP0352215A2/fr
Publication of EP0352215A3 publication Critical patent/EP0352215A3/de
Application granted granted Critical
Publication of EP0352215B1 publication Critical patent/EP0352215B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/44—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts
    • E21B10/445—Bits with helical conveying portion, e.g. screw type bits; Augers with leading portion or with detachable parts percussion type, e.g. for masonry
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E21B37/02—Scrapers specially adapted therefor

Definitions

  • the invention relates to a drilling tool according to the preamble of claim 1.
  • the outside diameter of the spiral shank of a conventional rock drill is always below the nominal diameter of the drilling tool, which is formed by the outside diameter of the hard metal cutting edge. As a result, the spiral shaft cannot completely ensure that the drilling dust is properly scraped off the inner wall of the borehole.
  • a drilling tool which has become known which has a slide-on conveying helix which consists of a screw-shaped wire part made of rubber, synthetic rubber, pressed material or is provided with bristles, the outer edge the helix is narrow and flexible, so that a certain brush effect and thus cleaning of the borehole is to be achieved through these areas.
  • a disadvantage of this known drilling tool is the structure of these brushing elements, which is to be formed by simply reducing the wall thickness of an otherwise conventional conveying spiral or by gluing the brushing elements. In practice, this should lead to rapid wear of these areas in the first-mentioned training, since these are not actual brush-like organs, but rather means which at most exert a certain scraping effect.
  • a rotating and brushing tool for use in a pipe cleaning machine has also become known.
  • a front, rotating plate is used for material removal, similar to a drilling tool within a pipe to be cleaned.
  • bristle bundles leading radially outwards are arranged on the shaft and have a cleaning effect on the pipe to be cleaned.
  • This tool is not a drilling tool to be used specifically for the use of stone work, in which the transport of drilling dust plays an essential role.
  • the invention is based on the object of proposing a drilling tool, in particular a rock drill, which ensures problem-free discharge of the drilling dust from the borehole during the manufacturing process and has a high durability or resistance.
  • the invention is based on the knowledge that only one Wholesome brush element made of bristles can bring about a satisfactory and absolutely safe cleaning of a borehole, ie the arrangement according to the prior art is not very suitable for reliable removal of the drilling dust, in particular under difficult conditions.
  • the invention provides full-fledged brush elements with a large number of individual bristles, which process every area of the borehole with a large effective brushing surface. This ensures an absolutely safe removal of the drilling dust from the borehole.
  • the invention further provides that, in addition to the function of cleaning the inner wall of the borehole, the brush elements also serve as a conveyor helix due to a corresponding helical arrangement of these brush elements.
  • Either individual bristle bundles or elongated strip brushes are used as brush elements, as are known per se from other fields of application.
  • the basic idea according to the invention is realized particularly advantageously on a one-piece drilling tool or on a drilling tool provided with a plug-on helix.
  • the brush elements can either be inserted directly into the existing grooves of a conventional drilling tool or into grooves or recesses in a cylindrical shaft. In the latter case, the brush elements alone form the spiral gear. The same applies if you make this arrangement on a plug-on conveyor spiral.
  • the brush elements in bores or in grooves glued in or, if necessary, fastened in a form-fitting manner by means of a snap connection.
  • the brush elements can also be soldered in or screwed in with a cylindrical brush foot.
  • the brush elements can be designed as replaceable elements.
  • the bristle or brush elements can also be fixed by means of material flanging.
  • the bristle bundles are arranged in the groove base of the spiral shaft in such a way that they overlap in the axial direction or that they are also arranged spirally in the groove base.
  • the axial overlap ensures that every inner surface area of the borehole is covered.
  • strip brushes are arranged on a flexible carrier tape made of plastic or metal, this tape in turn being spirally wound up in grooves. It is advantageous if the carrier tape is completely embedded in a groove so that the brushes cannot be sheared off.
  • strip brushes are arranged asymmetrically in the grooves in such a way that an additional drilling dust space results from the groove.
  • the brushes are welded onto the plastic carrier tape or directly onto a tubular slip-on helix, the individual brushes penetrating approximately 5/10 mm into the base material.
  • strip brushes When using strip brushes, it is also advantageous if they are arranged spirally in segment sections, wherein metal webs can preferably be provided as supporting conveyor spiral sections between the segment sections.
  • a conveying helix in a preferred embodiment of the invention, can be formed in a conventional manner with a metal web or, in the case of an attachable helix, also with a plastic web and the second conveying helix can be formed by brush elements.
  • the spiral shaft or the conveying helix can be produced from a twisted or twisted base material, the base material having axial longitudinal grooves or axially arranged bores for receiving the brush elements before the twist, which form a spiral after the twist.
  • the brush elements are only arranged in the upper third of the spiral shaft, since this can be sufficient for cleaning the borehole. In principle, however, it is possible to equip the spiral shaft with brush elements.
  • the brush elements themselves are designed as conveying coils or sections of conveying coils, the task of conveying the drilling dust is carried out by the brush elements themselves and possibly by the additional grooves for the strip brushes.
  • the individual bristle bundles or the strip-shaped strip brushes are suitable.
  • the rock drill 1 shown in FIG. 1 consists of a drill head 2, a clamping shaft 3 and a spiral shaft or a conveying helix 4 located in between.
  • a drill head 2 a clamping shaft 3 and a spiral shaft or a conveying helix 4 located in between.
  • the embodiment according to FIG serve to clean the borehole of drilling dust.
  • the Individual bundles of bristles are attached in the groove base of the spiral shaft in such a way that they do not or only insignificantly impair the conveying of drilling dust from the helix.
  • the individual bristle bundles are introduced into bores 7 in the groove base 5 of the spiral shaft 4, the upper bristle bundle 6 in Fig. 3 glued into the bore 7 and the lower bristle bundle 6 'by means of a snap connection 8 in the bore 7th is introduced.
  • a threaded connection can also be provided.
  • the bristle bundle 6 consists of a one-piece, brush-like round or conical bristle element made of a plastic or metal with an optionally molded foot as a fastening element, such as. B. screw head or snap connection 8 or soldering or adhesive sleeve 12.
  • a fastening element such as. B. screw head or snap connection 8 or soldering or adhesive sleeve 12.
  • Such elements are shown for example in the brochure of Pedex & Co. GmbH in 6948 Wald-Michelbach.
  • the bristle bundles 6 can be arranged off-center in the drilling dust groove or the groove base 5 of a conventional drilling tool.
  • the distance a pointing towards the drill head in the groove base is made larger than the remaining distance b, since this area serves to hold the drilling dust.
  • the individual bristle bundles 6 are arranged spirally on a smooth cylindrical conveyor helix shaft 9, so that they are arranged in the manner of a separate conveyor helix 10 with the pitch angle ⁇ .
  • the outer effective The diameter (d) of the conveying helix 10 formed by the bristle bundles 6 is the same size or slightly larger than the nominal diameter (D) of the drilling tool, the nominal diameter being formed by the hard metal cutting element 11 on the drill head 2. This ensures that the inner wall of the borehole is always reached by the brushes of the individual bristle bundles. This also applies to the exemplary embodiment according to FIG. 1.
  • the bristle bundles 6 are introduced into bores in the wall 14 of a hollow helix 15 which is hollow in the inner region.
  • the bristle bundles 6 are in turn arranged spirally to form a conveyor helix 10 with the pitch angle ⁇ .
  • This plug-on helix 15 can then be pushed onto a cylindrical drill shaft in a conventional manner.
  • continuous grooves 18 are made in the wall 14 of the plug-on helix 15 (FIG. 4), as is also shown in the exemplary embodiment according to FIG. 5 for a solid material for a drill spiral shaft 9.
  • the strip brushes thus form a separate conveyor helix 19, similar to the conveyor helix 10 in FIG. 2, formed from the individual bristle bundles 6. This conveyor helix then also has the task of transporting the drilling dust out of the borehole and cleaning the borehole wall of drilling dust.
  • the cylindrical drill shaft is also provided with grooves 18 for receiving the strip brushes 17, possibly with additional gaps 20 'or webs 21'.
  • the outer diameter (d) of the strip brushes 17 is, as in the examples described above, of the same size or slightly larger than the nominal diameter (D) of the drilling tool.
  • FIGS. 6a to c show a horizontal section through the spiral shaft according to FIG. 3 or 5 with different types of fastening of the bristle bundles or the strip brushes. It must be ensured here that the individual bristles are firmly clamped to the conveyor helix shaft or are otherwise fastened. 6a to c, undercuts 22 are provided for this purpose, which allow the rear part of the bristles to expand and thus to strengthen the connection. Furthermore, edging 23 or other form-fitting connections can be provided.
  • the initially axially extending longitudinal grooves for receiving the strip brushes can also be produced with an undercut 22 according to FIG. 6 and the receiving base of the strip brushes can be shaped accordingly.
  • the strip brush can then be inserted into this guide groove in an axial feed movement before or after the drill shaft is twisted.
  • the conveyor helix 10 formed from the bristle bundles 6 or the conveyor helix 19 formed from the strip brushes 17 can form one of the two conveyor helices, while the second conveyor helix is retained as a conventional metal web.
  • the strip brush 17 has a carrier tape 24 made of plastic or metal, in which the bristles 25 are anchored.
  • the strip brush 17 has a carrier tape 24 made of plastic or metal, in which the bristles 25 are anchored.
  • deep puncture grooves 18 are provided, into which the carrier tape 24 is completely sunk.
  • the depth t of the sinking of the carrier tape 24 into the groove 18 should be approximately two times b (t ⁇ 2 xb) , where b is the width of the bristles 25.
  • the bristles 25 can be arranged asymmetrically in the groove 18, ie the upper region x 1 is larger than the lower region x 2, whereby an additional drilling dust space 27 is created above the bristles 25. This arrangement can also be transferred to FIG. 7.
  • FIG. 8 shows a strip brush 17 in the upper area corresponding to the description in FIG. 7, but without carrier tape 24.
  • an arrangement of bristle bundles 28 in a groove 18 is shown.
  • These bristle bundles can, however, also be welded onto a carrier tape 24 ', similar to the carrier tape 24 according to FIG. 7, and thus form a strip brush with individual bristle bundles 6 that can be wound up.
  • both a strip brush 17 and a bristle bundle strip 28 are applied to a conveyor spiral in corresponding grooves 18 or directly on the conveyor spiral shaft without grooves, the arrangement being able to be carried out one after the other in the axial direction or - in the case of a two-start spiral - the one spiral path consists of a strip brush 17 and the other spiral path consists of a strip-shaped bristle bundle 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Brushes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (10)

  1. Outil de forage pour des foreuses à marteau ou des marteaux perforateurs pour des travaux d'exploitation de la roche, comportant une tête de fleuret (2), un arbre de fleuret (3) et un arbre d'hélice de transport (9,14) agencé entre eux, comportant une hélice de transport à filet unique ou à filet double, des organes de brossage (6,17) pour nettoyer le trou de forage étant prévus, en forme d'hélice ou de spirale, sur un outil de forage (1) en une seule pièce ou sur une hélice d'enfichage (15) pour un outil de forage, dont le diamètre externe efficace (d) s'étend au moins jusqu'au diamètre nominal (D) du fleuret,
    caractérisé en ce que les organes de brossage (6,7) sont réalisés en tant que paquets de poils (6) cylindriques ou polygonaux, ou en tant que brosses allongées (17), les paquets de poils (6) étant logés dans des évidements (7) de l'arbre (5,9) de l'hélice de transport ou de l'hélice d'enfichage (15), et les brosses allongées (17) étant logées dans des gorges (18) de l'arbre (5,9) de l'hélice de transport ou de l'hélice d'enfichage.
  2. Outil de forage selon la revendication 1,
    caractérisé en ce que les organes de brossage (6,17) sont collés dans les évidements (7) ou dans les gorges (18).
  3. Outil de forage selon une des revendications 1 ou 2,
    caractérisé en ce que les paquets de poils individuels (6) sont agencés dans le fond (5) de la gorge d'une hélice de transport (4) en matière synthétique ou en métal usuelle en se chevauchant axialement en forme de spirale.
  4. Outil de forage selon la revendication 1,
    caractérisé en ce que les organes de brossage sont réalisés en tant que brosses allongées (17) ou en tant que bandes de paquets de poils (28), qui sont agencées sur une bande de support souple (24,24'), pouvant être collée ou brasée, en matière synthétique ou en métal, laquelle est logée dans des gorges (18) du tronçon de l'hélice de transport.
  5. Outil de forage selon la revendication 4,
    caractérisé en ce que la bande de support (24,24') pour les brosses allongées (17,28) est enchâssée dans l'âme (14) de l'hélice de transport sur toute sa largeur radiale (s).
  6. Outil de forage selon une des revendications 4 ou 5,
    caractérisé en ce que la bande de support (24) avec les brosses allongées (17) est agencée dans les gorges (18) de façon asymétrique, de sorte que la gorge forme un espace supérieur supplémentaire (27) pour la poussière de forage.
  7. Outil de forage selon une des revendications 4 à 6,
    caractérisé en ce que les brosses allongées (17) sont agencées en tronçons de segment (17',17'') en forme de spirale, des nervures métalliques (21) étant avantageusement prévues dans l'espace intermédiaire (20) entre les tronçons (17', 17'') des brosses allongées, en tant que tronçons de l'hélice de transport.
  8. Outil de forage selon une des revendications 1 à 7,
    caractérisé en ce que, pour une hélice de transport (4) à filet double, une première hélice de transport est formée par une nervure en matière synthétique ou en métal usuelle et la seconde hélice de transport (10,19) est formée par les organes de brossage (6,17).
  9. Outil de forage selon une des revendications 1 à 8,
    caractérisé en ce que l'hélice de transport (4) est constituée d'une matière de base ayant subi une torsion, laquelle, avant la torsion, présente au moins une gorge longitudinale axiale ou des perçages agencés axialement pour la réception des organes de brossage (6,17).
  10. Outil de forage selon une des revendications précédentes,
    caractérisé en ce que les organes de brossage ( 6,17) sont agencés dans le tiers supérieur, en regard de la tête (2) du fleuret, de l'hélice de transport (4).
EP89710056A 1988-07-16 1989-06-10 Outil de forage Expired - Lifetime EP0352215B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3824170 1988-07-16
DE3824170 1988-07-16

Publications (3)

Publication Number Publication Date
EP0352215A2 EP0352215A2 (fr) 1990-01-24
EP0352215A3 EP0352215A3 (en) 1990-12-05
EP0352215B1 true EP0352215B1 (fr) 1994-03-30

Family

ID=6358830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89710056A Expired - Lifetime EP0352215B1 (fr) 1988-07-16 1989-06-10 Outil de forage

Country Status (2)

Country Link
EP (1) EP0352215B1 (fr)
DE (1) DE58907334D1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001233611A1 (en) * 2000-03-10 2001-09-17 American Tool Companies A/S Drill bit
DE10015203A1 (de) 2000-03-27 2001-10-04 Hilti Ag Wendelbohrer
CN102330544A (zh) * 2011-10-13 2012-01-25 中国石油集团西部钻探工程有限公司 螺旋式套管刮削器
US10532412B2 (en) 2016-09-23 2020-01-14 Milwaukee Electric Tool Corporation Hole saw arbor assembly
US10730119B2 (en) 2017-01-06 2020-08-04 Milwaukee Electric Tool Corporation Hole saw
USD973733S1 (en) 2017-08-15 2022-12-27 Milwaukee Electric Tool Corporation Hole saw
CN112832773A (zh) * 2020-12-30 2021-05-25 重庆交通大学 一种用于隧道撑子面爆破开挖的变形钻头
CN118024394B (zh) * 2022-11-15 2024-10-11 长兴奥宇塑业有限公司 蒸压加气混凝土板网笼的连接组件、组网结构和使用方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1380517A (en) * 1920-06-28 1921-06-07 Samuel F Bashara Well-screen cleaner
US2693611A (en) * 1953-03-25 1954-11-09 William A Lombardi Flexible rotary cylindrical brush
GB836034A (en) * 1956-09-19 1960-06-01 Albico Prec Engineering Ltd An improved masonry or like drill bit
US3824646A (en) * 1972-11-17 1974-07-23 M Jai Combination drilling and brushing tool in a pipe cleaning machine
NL7401084A (fr) * 1973-01-27 1974-07-30

Also Published As

Publication number Publication date
EP0352215A2 (fr) 1990-01-24
EP0352215A3 (en) 1990-12-05
DE58907334D1 (de) 1994-05-05

Similar Documents

Publication Publication Date Title
DE3919095A1 (de) Bohrwerkzeug
DE69817485T2 (de) Eine Reibahle zum Ausräumen von Knochenkanälen
EP2468427B1 (fr) Outil et procédé destinés au nettoyage d'un trou de forage
EP0378964A2 (fr) Outil à trépaner
EP1301103B1 (fr) Element de traitement destine a un appareil pour le nettoyage des interstices entre les dents, ainsi que procede et dispositif pour sa production
DE2521555A1 (de) Mauerwerk-ankervorrichtung
EP0126409A2 (fr) Outil de forage
EP0707129B1 (fr) Outil de forage avec support et éléments de coupe
EP1162343B1 (fr) Outil de forage pour roche
EP0352215B1 (fr) Outil de forage
DE2735368C2 (de) Gesteinsbohrkrone mit einem Hartmetall-Bohrkopf
EP2801460B1 (fr) Trépan doté d'éléments de nettoyage de trou de forage pour forer et nettoyer un trou de forage
EP0351493B1 (fr) Foret pour la pierre
EP1860274B1 (fr) Pointe de forage
EP1083295A1 (fr) Outil de forage
DE1927754C3 (de) Gesteinsbohrer
EP2148100B1 (fr) Elément d'ancrage
EP0614020B1 (fr) Dispositif pour tenir flexiblement des outils rotatifs
EP0795677B1 (fr) Outil de forage
DE19545646A1 (de) Drehschlag-Wendelbohrer
DE699027C (de) Reinigungsvorrichtung fuer zylindrische Schaefte oder Zapfen von Bohrereinsteckenden
DE202008004581U1 (de) Entgratstab
DE1143484B (de) Buerstenelement und seine Verwendung
DE102005011120B4 (de) Schneckenbohrer
DE102005050974B4 (de) Verfahren zur Herstellung eines rotierenden Werkzeugs

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): CH DE FR GB IT LI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): CH DE FR GB IT LI

RHK1 Main classification (correction)

Ipc: B23Q 11/00

17P Request for examination filed

Effective date: 19901221

17Q First examination report despatched

Effective date: 19920211

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

REF Corresponds to:

Ref document number: 58907334

Country of ref document: DE

Date of ref document: 19940505

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

Effective date: 19940415

ET Fr: translation filed
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: 19950601

Year of fee payment: 7

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

Ref country code: CH

Payment date: 19950622

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: 19950628

Year of fee payment: 7

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

Ref country code: DE

Payment date: 19950719

Year of fee payment: 7

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

Ref country code: GB

Effective date: 19960610

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

Ref country code: LI

Effective date: 19960630

Ref country code: CH

Effective date: 19960630

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

Effective date: 19960610

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: FR

Effective date: 19970228

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

Ref country code: DE

Effective date: 19970301

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: 20050610