WO1999061840A1 - Chambre de combustion d'une turbine a gaz - Google Patents
Chambre de combustion d'une turbine a gaz Download PDFInfo
- Publication number
- WO1999061840A1 WO1999061840A1 PCT/SE1999/000862 SE9900862W WO9961840A1 WO 1999061840 A1 WO1999061840 A1 WO 1999061840A1 SE 9900862 W SE9900862 W SE 9900862W WO 9961840 A1 WO9961840 A1 WO 9961840A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- combustion chamber
- wall
- inlet end
- end portion
- cooling fluid
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
- F23R3/50—Combustion chambers comprising an annular flame tube within an annular casing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/002—Wall structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2203/00—Non-metallic inorganic materials
- F05C2203/08—Ceramics; Oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2253/00—Other material characteristics; Treatment of material
- F05C2253/12—Coating
Definitions
- the present invention refers to a combustion chamber device for a gas turbine, comprising a wall member which defines a combustion chamber having an inlet end and an outlet end, wherein the wall member comprises an inlet end portion which has at least one opening for receiving a burner member, arranged to generate a flame in the combustion chamber, and means for conveying a cooling fluid outside the combustion chamber to the inlet end portion of the wall member for cooling thereof.
- Conventional gas turbine plants comprises normally a com- pressor arranged to deliver compressor air to a burner which in turn is arranged to generate a flame in the combustion chamber.
- the latter In order to cool a combustion chamber wall, and in particular the inlet end portion thereof, the latter is normally provided with a number of holes in order to supply di- rectly via the holes a part of the compressor air to the combustion chamber in such a manner that a layer of compressor air is formed on the inner side of the inlet end portion, whereby a so-called film cooling is obtained.
- An object of the present invention is to provide a combustion chamber device which enable a combustion with relatively low NO x concentrations and a relatively high efficiency of a gas turbine run by the combustion gases from said combustion.
- the combustion chamber device initially defined, which is characterized in that the inlet end portion is substantially closed and defines a barrier against penetration by the cooling fluid into the combustion chamber except through the burner member. Since the cooling fluid may not be introduced directly into the combustion chamber the maintenance of a relatively uniform flame temperature of the combustion is promoted, which is favourable since relatively high local temperature peaks of the flame leads to high NO x emissions. Thanks to the closed inlet end portion the temperature difference between the flame proper and the combustion gases which reaches a following, first turbine stage or rotor blade wheel of the gas turbine is reduced in comparison with the case when the combustion cham- ber device, according to previous technique, uses film cooling at the inner side of the inlet end portion.
- the combustion chamber has a substantially annular shape and is arranged to extend around a rotary axis of a rotor of said gas turbine.
- one single combustion chamber may replace the plurality of separate combustion chambers which according to the conventional prior art are provided around the rotor axis upstream the first turbine stage.
- the total wall surface of the combustion chamber may be reduced in comparison with the total wall surface given by several separate combustion chambers. This means that the wall surface to be cooled may be reduced substantially. The part of the inlet end portion of the total wall surface will thereby increase, which means that it is even more important to perform a cooling in such a manner that it has no negative influence on the heat conditions within the combustion chamber.
- the wall member comprises a first, inner wall which is arranged to extend around the ro- tary axis, and a second, outer wall portion which is arranged to extend around the rotary axis, wherein the inlet end portion defines an annular wall portion extending around the rotary axis and connecting the first and second wall portions.
- the combustion chamber device comprises a space for collecting gas to be supplied to the burner member, and a channel arranged to convey the cooling fluid to be used for cooling of the inlet end portion to said space.
- the cooling fluid preferably is comprised by compressor air which may and should be used by the burner member for the generation of the flame, this embodiment results in a more efficient utilisation of said compressor air.
- the combustion chamber device comprises a member which together with an outer surface of the inlet end portion defines a gap, into which cooling fluid is conveyed for cooling the inlet end portion and from which the cooling fluid is conveyed via said channel, wherein the member comprises a sheet, provided substantially opposite to and in parallel with the outer surface of the inlet end portion to be cooled by the cooling fluid.
- the sheet has a plurality of holes, arranged to convey the cooling fluid through the sheet, in a direction towards the outer surface of the inlet end portion to be cooled by the cooling fluid. This feature means that so- called impingement cooling may be obtained at the inlet end portion.
- the combustion chamber device comprises a plurality of burner members and the inlet end portion comprises a plurality of openings, which are distributed around the rotary axis and which each is arranged to receive a respective burner member. Due to the fact that the burner members are provided in this manner at a plurality of location in the annular inlet end portion, it is of an evident importance that the inventive provision of the combustion chamber device results in an efficient cooling of the inlet end portion along substantially the whole extension thereof.
- the inlet end portion comprises a metal sheet which is covered by a ceramic layer on the side which faces the combustion chamber.
- a high temperature resistance of the inlet end portion is obtained, whereby the cooling need is somewhat reduced.
- a longer operation lifetime of the inlet end portion may thereby be obtained, and the need for cool-. •' * ing of the side facing the combustion chamber is reduced or eliminated.
- Fig 1 discloses schematically a sectional view through a gas turbine plant having a combustion chamber device according to the invention
- Fig 2 discloses in more detail a cross-sectional view of a part of the combustion chamber device
- Fig 3 discloses a section of an annular sheet provided with holes for directing a cooling medium towards a inlet end portion, which is disclosed in Fig 2 and 4 , and
- Fig 4 discloses an alternative embodiment of a part of the combustion chamber device. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
- a gas turbine arrangement 1 which appears from Fig 1, comprises a compressor 2 and a gas turbine 3, here solely called turbine.
- a combustion chamber device 4 of an annular type i.e. a combustion chamber device, the combustion chamber 5 of which extends as a ring and forms a torus around a rotary axis x of the gas turbine arrangement 1.
- the combustion chamber device 4 comprises a plurality of burner members 6, arranged to provide a combus- tion in the combustion chamber 5 for generating a hot gas therein.
- the burner members 6 thereby project via openings 7 into the combustion chamber 5.
- the hot gas is conveyed further to the turbine 3 and brings a rotor 9 thereof to rotate.
- a compressor 2 is arranged to deliver a compressor medium, in this case compressed air, to the combustion chamber device 4, and more precisely to the burner members 5, which use the compressor air for their combustion function.
- the combustion chamber device 4 thereby comprises a space 10, which receives the compressor medium and surrounds the combustion chamber 5, or more precisely a wall member 11 enclosing and defining the combustion chamber 5.
- the wall member 11 comprises in its turn a radially inner wall portion 12, a radially outer wall portion 13 and an inlet end portion 14, which connects the inner wall portion 12 and the outer wall portion 13 and in which the openings 7 for the burner members 6 are provided.
- the combustion chamber 5 is substantially completely closed, i.e. there are essentially no holes or openings in the different portion 12, 13, 14 of the wall member 11.
- the compressor medium, used for cooling purposes is conveyed into the burner member 6 it is collected in a space 15 en- closing at least a part of the burner member 6 and being connected to the wall member 11.
- the inlet end portion 14 is cooled by means of a cooling fluid which is permitted to flow towards or along at least a part of a surface of the inlet end portion 14 which faces away from the combustion chamber 5.
- the compressor medium defines said cooling fluid.
- the cooling fluid for cooling of the in- let end portion 14 is compressor air which via the space 10 is conveyed to and directed towards the inlet end portion 14 for cooling thereof.
- the combustion chamber device 4 thereby comprises means 16, 17 for conveying the cooling fluid from the space 10 to the inlet end portion 14. It is to be noted here that the inlet end portion 14 is shielded off from the space 10 by a shielding member 18 which encloses and thereby defines the space 15.
- the conveying means 16, 17 comprises openings in the shielding member 18 and conduits via which the cooling fluid is supplied to the surface of the inlet end portion 14 to be cooled.
- the end portion 14 of the wall member 11 has a double wall, i.e. a space 19 is formed between two walls of the end portion 14. Compressor air may be supplied to this space 19 via gap-shaped opening 16 extending through the shielding member 18. From the space 19, cooling fluid is supplied to the collecting space 15 via a channel 20 in order to be supplied finally to the burner member 6. The cooling fluid, i.e. the compressor air flowing through the space 19, will thus contribute to the cooling of the end portion 1 .
- the inlet end portion 14 comprises in this embodiment an inner wall 21 adjacent the combustion chamber and an outer wall 22.
- the inner wall 21 defines together with the inner wall portion 12 and the outer wall portion 13 the combustion chamber 5.
- This inner wall 21 needs cooling. It may, in this case, have an annular shape and comprises the inlet openings 7.
- a sleeve 23 is arranged to receive a respective burner member 6.
- the sleeve 23 is at its outer periphery attached to the inner periphery of the inlet opening 7.
- a ring 24 is provided on the side of the inner wall 21 which faces a way from the combustion chamber 5.
- the ring is provided with radial holes 25 through which the cooling fluid, i.e. the compressor air, may flow in a direction towards the sleeve 23.
- the combustion chamber device comprises a member 26, which together with an outer surface of the inner wall 21 of the inlet end portion 14 defines a gap 27, into which cooling fluid is conveyed in order to cool the inner wall 21 of the inlet end portion 14.
- this gap 27 is a part of the space 19, which is delimited by the delimiting member 26.
- the member 26 comprises a sheet, provided essen- tially opposite to and in parallel with the outer surface of the inner wall 21 of the inlet end portion 14 to be cooled by the cooling fluid.
- the sheet 26 has a plurality of holes 28, which are arranged to convey the cooling fluid through the sheet 26 in a direction towards the outer surface of the inner wall 21 of the inlet end portion 14 to be cooled.
- the sheet 26 is annular and provided with openings 29.
- the sheet 26 is arranged to be supported by the rings 24. At its inner and outer periphery, the sheet 26 abuts projections 30 projecting from the inlet end portion 14. Thanks to the provision of the gap 27 and the holes 28 a so-called impingement cooling of the inner wall 21 is obtained.
- the sleeve 23 extends from the combustion chamber and is at its end directed from the combustion chamber 5 provided with a radially projecting flange 31.
- a plurality of axial holes 32 are provided in the flange 31.
- a ring member 33 forming a part of the outer wall 22, is provided in such a manner that an annular space is formed between the outer wall 22 and the sleeve 23.
- the end portion of the outer wall 22 is provided essentially op- posite to and is supported by the ring member 33.
- the ring member 33 is supported via the sheet 26 by the ring 24.
- said space defines the channels 20, via which the cooling fluid/compressor air may be conveyed to the gas collecting space 15.
- the cooling fluid from the space 10 flows via the openings 16 and the space 19 through the holes 28 in the sheet 26 to the gap 27 in such a manner that the inner wall 21 is cooled.
- the cooling fluid flows through the holes 25 in the ring 26 and the annular gap between the sleeve 23 and the ring member 33 through the channels 20 out into the collecting chamber 15, where it is mixed with cooling air from the wall portion 12 and 13 before it flows into the combustion chamber 5 via the burner 6.
- the inner wall 21 of the inlet end portion 14 is formed by a metal sheet of a temperature resistant type. Furthermore, the metal sheet is covered by a heat resistant material, preferably a ceramic layer, on the inner side, i.e. the side facing the combustion chamber 5. The ceramic layer covers substantially the whole inner side of the inner wall 21.
- the inlet end portion 14 comprises in this case a simple wall 34 which extends between the inner wall portion 12 and the outer wall portion 13 of the combustion chamber.
- the inlet end portion 14 is also in this case annular and comprises a number of openings 7 for receiving a plurality of burner members 6.
- the inlet end portion is essentially free from openings and thereby arranged not to convey any cooling fluid directly into the combustion chamber 5 but only permit air used for cooling of the inlet end portion 14 to be con- veyed into the combustion chamber 5 via the burner members 6.
- a sheet 35 is provided opposite to and in parallel with a portion of the wall 34.
- the sheet 35 forms together with a number of further sheets 36 - 38 an annular space into which a cooling medium, in this case cooling air, is conveyed via a conduit means 17, 39 comprising one or several pipes 39 extending from the space 10 to an area of said sheet 35.
- the sheet 35 is as well as the sheet 26 provided with a plurality of smaller holes 28 at an area thereof facing the wall 34. Via these holes 28 impingement cooling of the wall 34 is obtained.
- the embodiment is arranged to ensure that only direct high pressure air from the compressor 2 is used for said cooling, i.e. air which has not been previously used for any other cooling purpose.
- the wall 34 In the area around each burner member 6, the wall 34 is engaging said burner member 6.
- the sheet 35 is provided at a distance from the wall 34 in such a manner that a gap 27 is formed therebetween, and the air used for cooling of the wall may flow via the gap 27 and a channel 40 between the annular space and the sheet 35 into the collecting space 15.
- the sheet 35 or a portion 41 connected thereto is arranged to abut the wall 34 in a supporting and possibly sealing manner.
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU46620/99A AU4662099A (en) | 1998-05-25 | 1999-05-20 | Combustion chamber for gas turbine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9801818A SE9801818L (sv) | 1998-05-25 | 1998-05-25 | Brännkammaranordning |
SE9801818-7 | 1998-05-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999061840A1 true WO1999061840A1 (fr) | 1999-12-02 |
Family
ID=20411421
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1999/000862 WO1999061840A1 (fr) | 1998-05-25 | 1999-05-20 | Chambre de combustion d'une turbine a gaz |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU4662099A (fr) |
SE (1) | SE9801818L (fr) |
WO (1) | WO1999061840A1 (fr) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7914553B2 (en) | 1999-08-13 | 2011-03-29 | Anova Corporation | Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft |
EP2463583A1 (fr) * | 2010-12-06 | 2012-06-13 | Alstom Technology Ltd | Turbine à gaz et procédé de reconditionnement d'une telle turbine à gaz |
US8834496B2 (en) | 2006-06-13 | 2014-09-16 | Bret A. Ferree | Soft tissue repair methods and apparatus |
US8936642B2 (en) | 1999-05-28 | 2015-01-20 | Anova Corporation | Methods for treating a defect in the annulus fibrosis |
US9232938B2 (en) | 2006-06-13 | 2016-01-12 | Anova Corp. | Method and apparatus for closing fissures in the annulus fibrosus |
US9592062B2 (en) | 1999-05-28 | 2017-03-14 | Anova Corp. | Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4843825A (en) * | 1988-05-16 | 1989-07-04 | United Technologies Corporation | Combustor dome heat shield |
US5209066A (en) * | 1990-12-19 | 1993-05-11 | Societe Nationale D'etude Et De Construction De Moteurs | Counter flow combustion chamber for a gas turbine engine |
DE4444961A1 (de) * | 1994-12-16 | 1996-06-20 | Mtu Muenchen Gmbh | Einrichtung zur Kühlung insbesondere der Rückwand des Flammrohrs einer Brennkammer für Gasturbinentriebwerke |
EP0780638A2 (fr) * | 1995-12-20 | 1997-06-25 | Mtu Motoren- Und Turbinen-Union MàNchen Gmbh | Chambre de combustion pour turbine à gaz |
-
1998
- 1998-05-25 SE SE9801818A patent/SE9801818L/ not_active Application Discontinuation
-
1999
- 1999-05-20 AU AU46620/99A patent/AU4662099A/en not_active Abandoned
- 1999-05-20 WO PCT/SE1999/000862 patent/WO1999061840A1/fr active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4843825A (en) * | 1988-05-16 | 1989-07-04 | United Technologies Corporation | Combustor dome heat shield |
US5209066A (en) * | 1990-12-19 | 1993-05-11 | Societe Nationale D'etude Et De Construction De Moteurs | Counter flow combustion chamber for a gas turbine engine |
DE4444961A1 (de) * | 1994-12-16 | 1996-06-20 | Mtu Muenchen Gmbh | Einrichtung zur Kühlung insbesondere der Rückwand des Flammrohrs einer Brennkammer für Gasturbinentriebwerke |
EP0780638A2 (fr) * | 1995-12-20 | 1997-06-25 | Mtu Motoren- Und Turbinen-Union MàNchen Gmbh | Chambre de combustion pour turbine à gaz |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8936642B2 (en) | 1999-05-28 | 2015-01-20 | Anova Corporation | Methods for treating a defect in the annulus fibrosis |
US9084616B2 (en) | 1999-05-28 | 2015-07-21 | Anova Corporation | Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft |
US9241796B2 (en) | 1999-05-28 | 2016-01-26 | Bret A. Ferree | Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft |
US9592062B2 (en) | 1999-05-28 | 2017-03-14 | Anova Corp. | Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft |
US10327907B2 (en) | 1999-05-28 | 2019-06-25 | Suture Concepts Inc. | Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft |
US7914553B2 (en) | 1999-08-13 | 2011-03-29 | Anova Corporation | Methods and apparatus for treating disc herniation and preventing the extrusion of interbody bone graft |
US8834496B2 (en) | 2006-06-13 | 2014-09-16 | Bret A. Ferree | Soft tissue repair methods and apparatus |
US9232938B2 (en) | 2006-06-13 | 2016-01-12 | Anova Corp. | Method and apparatus for closing fissures in the annulus fibrosus |
US10245018B2 (en) | 2006-06-13 | 2019-04-02 | Suture Concepts Inc. | Method and apparatus for closing fissures in the annulus fibrosus |
EP2463583A1 (fr) * | 2010-12-06 | 2012-06-13 | Alstom Technology Ltd | Turbine à gaz et procédé de reconditionnement d'une telle turbine à gaz |
CH704185A1 (de) * | 2010-12-06 | 2012-06-15 | Alstom Technology Ltd | Gasturbine sowie verfahren zum rekonditionieren einer solchen gasturbine. |
AU2011253595B2 (en) * | 2010-12-06 | 2015-07-16 | General Electric Technology Gmbh | Gas turbine and method for reconditioning such a gas turbine |
Also Published As
Publication number | Publication date |
---|---|
SE9801818D0 (sv) | 1998-05-25 |
AU4662099A (en) | 1999-12-13 |
SE9801818L (sv) | 1999-11-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1556596B8 (fr) | Conduit de transition refroidi par effusion avec trous de refroidissement formes | |
US6293089B1 (en) | Gas turbine | |
US7441409B2 (en) | Combustor liner v-band design | |
US9464538B2 (en) | Shroud block segment for a gas turbine | |
CN110030045B (zh) | 具有环形腔的涡轮发动机 | |
US7029236B2 (en) | Closed circuit blade-cooled turbine | |
US6261054B1 (en) | Coolable airfoil assembly | |
US4926630A (en) | Jet air cooled turbine shroud for improved swirl cooling and mixing | |
EP3470628B1 (fr) | Ensemble de cadre arrière pour pièce de transition d'une turbine à gaz | |
US4944152A (en) | Augmented turbine combustor cooling | |
US4203283A (en) | Combustion chamber, especially annular reverse-flow combustion chamber for gas turbine engines | |
KR20060046516A (ko) | 성곽 형상을 가지는 단부를 구비한 에어포일 삽입체 | |
JP2005037122A (ja) | ガスタービンエンジンの燃焼器を冷却するための方法及び装置 | |
WO1999061840A1 (fr) | Chambre de combustion d'une turbine a gaz | |
US10718224B2 (en) | AFT frame assembly for gas turbine transition piece | |
US5129224A (en) | Cooling of turbine nozzle containment ring | |
US6676370B2 (en) | Shaped part for forming a guide ring | |
CA1183695A (fr) | Gaine de transition a refroidissement efficace pour turbines a gaz de grande puissance | |
JP6142092B2 (ja) | 炎管終端領域を有する管状燃焼チャンバ及びガスタービン | |
US6968672B2 (en) | Collar for a combustion chamber of a gas turbine engine | |
US6996992B2 (en) | Gas collection pipe carrying hot gas | |
US11821365B2 (en) | Inducer seal with integrated inducer slots |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AL AM AT AT AU AZ BA BB BG BR BY CA CH CN CU CZ CZ DE DE DK DK EE EE ES FI FI GB GE GH GM HR HU ID IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SK SL TJ TM TR TT UA UG US UZ VN YU ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW SD SL SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
NENP | Non-entry into the national phase |
Ref country code: KR |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
122 | Ep: pct application non-entry in european phase |