EP1356185A1 - A method and drill bit for reducing the cuttings size to a predetermined maximum size - Google Patents
A method and drill bit for reducing the cuttings size to a predetermined maximum sizeInfo
- Publication number
- EP1356185A1 EP1356185A1 EP01985461A EP01985461A EP1356185A1 EP 1356185 A1 EP1356185 A1 EP 1356185A1 EP 01985461 A EP01985461 A EP 01985461A EP 01985461 A EP01985461 A EP 01985461A EP 1356185 A1 EP1356185 A1 EP 1356185A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drill bit
- drilling
- drilling fluid
- buttons
- percussive
- 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.)
- Granted
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 41
- 239000012530 fluid Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 6
- 239000010432 diamond Substances 0.000 claims abstract description 6
- 238000009527 percussion Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 10
- 239000011435 rock Substances 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000035515 penetration Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
Classifications
-
- 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
- E21B10/36—Percussion drill bits
- E21B10/38—Percussion drill bits characterised by conduits or nozzles for drilling fluids
-
- 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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
-
- 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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/56—Button-type inserts
- E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
- E21B10/5671—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts with chip breaking arrangements
Definitions
- the present invention relates to a method for drilling deep holes in the ground by means of a drill string, a percussion drilling hammer at the lower end of the drill string, and a percussive drill bit having a diameter of at least 75 mm and being connected to the percussion drilling hammer, where drilling fluid is supplied to the percussion drilling hammer and drill bit through the drill string and is returned at a given velocity through an annular space formed between the drill string and the hole.
- buttons of hard metal When the drill bit impacts against the bottom of the borehole, the buttons knock pieces of varying size loose from the ground material . Some of these may have a size above 10 mm, somewhat dependent on the type of rock to be drilled. Due to the density and viscosity of the drilling fluid, these large particles of the cuttings will nevertheless be carried along by the drilling fluid up to the surface through the annular space between the well wall and drill string, where the flow velocity typically may lie in the range 0.4-2 m/sec.
- the cuttings pass up along the head of the bit through channels in the side surface of the head.
- the drilling fluid is usually supplied through two or more openings in the front face of the bit, which at least partially direct the flow radially outward towards the periphery of the bit in order to flush the cuttings out to said channels.
- the drilling fluid usually has a number of additives which makes it both expensive and harmful to the environment . Consequently, it is necessary to recover the drilling fluid, requiring a cleaning process, which in turn implies space consuming and expensive equipment for sifting and centrifuging the drilling fluid before it can be used over again.
- the purpose of the present invention is therefore to avoid, or at least reduce, the drawbacks and casts connected to the use of common drilling fluids.
- this is obtained by a method of the type mentioned by way of introduction where the characteristic features are that water is used as drilling fluid, and in that cuttings knocked loose by the drill bit are crushed to a predetermined maximum dimension before they are allowed to pass up along the bit to the annular space between the wall of the borehole and the drill string, said maximum dimension giving the cuttings a lower sinking velocity in water than the water velocity in the annular space .
- the cuttings will have a much higher sinking velocity in water than in drilling fluids. This entails that the heavier particles of the cutting will not be carried along by the water in the annular space unless the flow velocity is increased correspondingly. Particularly when drilling at larger depths, e.g. by means of coiled tubing, the flow resistance in the drill string and other pressure losses will make it practically impossible to provide a sufficient flow rate to carry the largest particles up to the surface. As a result, the cuttings will pack in the annular space and make further drilling impossible.
- the invention has solved this problem by ensuring that the cuttings, before being allowed to pass by the bit and up into the annular space, are crushed to such an extent that there do not exist particles of such a size that the water flow in the annular space is not able to carry these to the surface.
- This maximum particle size will vary according to the type of rock to be drilled. In shale rock the large particles will generally take the form of flakes, which should be crushed to a length of maximum 6 mm. If the rock is gneiss or granite, the particles usually have a more rounded form and should in such cases be crushed to a largest dimension of about 4 mm.
- a preferred solution according to the invention is, however, very simple, inexpensive and efficient. It consists of limiting the flow cross-section, particularly the depth, of the return channels in the side surface of the bit. As a result, the cuttings cannot pass by the bit until they have been crushed to a sufficient extent. This maximum depth will of course also be dependant upon the form of the cutting particles, but for bits above a certain size it will usually lie in the range of 1.5-4 mm.
- buttons in the outermost row along the periphery of the bit are increased. Furthermore, it is suggested to provide these 0 outermost buttons with a diamond coating which increases their service life, while in at least the majority of the buttons on the inside are not provided with such a coating. This insures that buttons on the inside are worn out and stop the penetration of the bit before the buttons along s the periphery are worn to such an extent that the diameter of the hole has been reduced to a noticeable degree .
- fig. 1 is a view of the bit seen from the front
- fig. 2. is a partial section along the line II-II in fig. 1.
- the percussive bit 1 according to the invention shown in the drawing comprises a head 2 and a peripheral side surface 4, where hard metal inserts or buttons 5, 6, 7, 8 are inserted in the front face 3 thereof .
- the buttons 5 are arranged in an outer row adjacent the side surface 4 of the o head 2 of the bit.
- the number of buttons 5 is so large that the average distance between the buttons is less than the diameter of the buttons.
- the buttons 5 are also coated with a diamond material, this being indicated in the drawing by a cross-hatching consisting of crossing lines.
- the buttons 6 in the row on the inside have a much larger spacing and are not provided with a diamond coating.
- Inside the buttons 6 is a further row consisting of two diametrally opposite buttons 7, and innermost there is a single button 8, which may have a diamond coating.
- channels 9 in which drilling fluid, in this case water, carrying along cuttings may flow through up along the bit to the annular space between the wall of the hole made by the bit and the drill string (not shown) .
- the channels 9 can have somewhat varying shape and depth, but the depth, measured with respect to an imaginary continuation of the side surface 4, must not supersede a given value determined by i .a . the type of rock to be drilled, the cross-sectional area of the annular space and the flow rate of the drilling water.
- a practical range for this maximum depth is 1.5-4 mm, the upper limit preferably being less than 5 mm, preferably maximum 3.5 mm in order to keep the flow rate of drilling water on a reasonable level.
- the front face 3 of the bit has an outlet opening 10 for drilling water which is so centrally located in the bit that it overlaps with the central axis 11 of the bit. This ascertains effective flushing of the entire bottom area of the borehole .
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Drilling Tools (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20006591A NO316856B1 (en) | 2000-12-21 | 2000-12-21 | Procedure for drilling and percussion drill for performing this |
NO20006591 | 2000-12-21 | ||
PCT/NO2001/000506 WO2002052122A1 (en) | 2000-12-21 | 2001-12-21 | A method and drill bit for reducing the cuttings size to a predetermined maximum size |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1356185A1 true EP1356185A1 (en) | 2003-10-29 |
EP1356185B1 EP1356185B1 (en) | 2006-09-06 |
Family
ID=19911940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01985461A Expired - Lifetime EP1356185B1 (en) | 2000-12-21 | 2001-12-21 | A method and drill bit for reducing the cuttings size to a predetermined maximum size |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1356185B1 (en) |
AT (1) | ATE338877T1 (en) |
DE (1) | DE60122933T2 (en) |
NO (1) | NO316856B1 (en) |
WO (1) | WO2002052122A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3918538A (en) * | 1974-07-01 | 1975-11-11 | Hughes Tool Co | Rotary percussion earth boring bit |
US4373592A (en) * | 1980-11-28 | 1983-02-15 | Mobil Oil Corporation | Rotary drilling drill string stabilizer-cuttings grinder |
NO892223L (en) * | 1988-06-03 | 1989-12-04 | Boart Int Ltd | Bit. |
US5366032A (en) * | 1993-06-09 | 1994-11-22 | Kay Mark A | Rock bit |
-
2000
- 2000-12-21 NO NO20006591A patent/NO316856B1/en not_active IP Right Cessation
-
2001
- 2001-12-21 EP EP01985461A patent/EP1356185B1/en not_active Expired - Lifetime
- 2001-12-21 AT AT01985461T patent/ATE338877T1/en active
- 2001-12-21 DE DE60122933T patent/DE60122933T2/en not_active Expired - Lifetime
- 2001-12-21 WO PCT/NO2001/000506 patent/WO2002052122A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO02052122A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE338877T1 (en) | 2006-09-15 |
NO20006591L (en) | 2002-06-24 |
NO20006591D0 (en) | 2000-12-21 |
DE60122933T2 (en) | 2007-09-06 |
WO2002052122A1 (en) | 2002-07-04 |
DE60122933D1 (en) | 2006-10-19 |
NO316856B1 (en) | 2004-06-01 |
EP1356185B1 (en) | 2006-09-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3924698A (en) | Drill bit and method of drilling | |
US3215215A (en) | Diamond bit | |
US3542142A (en) | Method of drilling and drill bit therefor | |
US5415243A (en) | Rock bit borhole back reaming method | |
US3055443A (en) | Drill bit | |
US2838284A (en) | Rotary drill bit | |
US4445580A (en) | Deep hole rock drill bit | |
US4892159A (en) | Kerf-cutting apparatus and method for improved drilling rates | |
US8113300B2 (en) | Impact excavation system and method using a drill bit with junk slots | |
US3688852A (en) | Spiral coil nozzle holder | |
US7398839B2 (en) | Impact excavation system and method with particle trap | |
GB2227509A (en) | A combination drill bit | |
CA1157009A (en) | Rotary drill bits and method of use | |
US4263936A (en) | Erosion resistant check valve assembly | |
US10519734B2 (en) | Downhole milling tool apparatus | |
US3384192A (en) | Hydraulic jet bit | |
US3175629A (en) | Jet bit | |
US4665999A (en) | Variable length three-cone rock bit nozzles | |
US10557313B1 (en) | Earth-boring bit | |
US4703814A (en) | Earth boring bit having a replaceable, threaded nozzle with wrench socket | |
CA1206144A (en) | Earth-boring drill bit with rectangular nozzles | |
US3548960A (en) | Drill bit having rotating stand-off elements | |
EP1356185A1 (en) | A method and drill bit for reducing the cuttings size to a predetermined maximum size | |
US4363367A (en) | Large diameter drill bit | |
US5881829A (en) | Rolling-cutter mining bit with relatively soft formation cutting structure |
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 |
|
17P | Request for examination filed |
Effective date: 20030718 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
AX | Request for extension of the european patent |
Extension state: AL LT LV MK RO SI |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
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 CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
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 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: 20060906 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: 20060906 Ref country code: FI 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: 20060906 Ref country code: BE 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: 20060906 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REF | Corresponds to: |
Ref document number: 60122933 Country of ref document: DE Date of ref document: 20061019 Kind code of ref document: P |
|
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: 20061206 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES 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: 20061217 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20061221 |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: TRGR |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: MC Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20061231 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT 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: 20070219 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: NV Representative=s name: FREI PATENTANWALTSBUERO AG |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
EN | Fr: translation not 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 |
Effective date: 20070607 |
|
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 FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20070511 Ref country code: GR 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: 20061207 |
|
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: 20061221 Ref country code: TR 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: 20060906 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CY 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: 20060906 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: 20060906 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: HOESSLE PATENTANWAELTE PARTNERSCHAFT, DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: RAIBLE, DEISSLER, LEHMANN PATENTANWAELTE PARTN, DE Effective date: 20120706 Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: HOESSLE PATENTANWAELTE PARTNERSCHAFT, DE Effective date: 20120706 Ref country code: DE Ref legal event code: R081 Ref document number: 60122933 Country of ref document: DE Owner name: GEOVARME AS, NO Free format text: FORMER OWNER: MOE, PER THOMAS, HEIMDAL, NO Effective date: 20120706 Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: GLAWE DELFS MOLL PARTNERSCHAFT MBB VON PATENT-, DE Effective date: 20120706 Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: RAIBLE, DEISSLER, LEHMANN PATENTANWAELTE PARTG, DE Effective date: 20120706 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: RAIBLE, DEISSLER, LEHMANN PATENTANWAELTE PARTN, DE Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: GLAWE DELFS MOLL PARTNERSCHAFT MBB VON PATENT-, DE Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: RAIBLE, DEISSLER, LEHMANN PATENTANWAELTE PARTG, DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: RAIBLE, DEISSLER, LEHMANN PATENTANWAELTE PARTN, DE Ref country code: DE Ref legal event code: R082 Ref document number: 60122933 Country of ref document: DE Representative=s name: RAIBLE, DEISSLER, LEHMANN PATENTANWAELTE PARTG, DE |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PCAR Free format text: NEW ADDRESS: POSTFACH, 8032 ZUERICH (CH) |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20210201 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20210223 Year of fee payment: 20 Ref country code: AT Payment date: 20210128 Year of fee payment: 20 Ref country code: SE Payment date: 20210209 Year of fee payment: 20 Ref country code: GB Payment date: 20210128 Year of fee payment: 20 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 60122933 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20211220 |
|
REG | Reference to a national code |
Ref country code: SE Ref legal event code: EUG |
|
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 EXPIRATION OF PROTECTION Effective date: 20211220 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK07 Ref document number: 338877 Country of ref document: AT Kind code of ref document: T Effective date: 20211221 |