WO1999032210A1 - Ensemble pour l'epuration automatique d'un fluide pollue et procede de mise en oeuvre - Google Patents
Ensemble pour l'epuration automatique d'un fluide pollue et procede de mise en oeuvre Download PDFInfo
- Publication number
- WO1999032210A1 WO1999032210A1 PCT/FR1998/002760 FR9802760W WO9932210A1 WO 1999032210 A1 WO1999032210 A1 WO 1999032210A1 FR 9802760 W FR9802760 W FR 9802760W WO 9932210 A1 WO9932210 A1 WO 9932210A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- impurities
- separator
- fraction
- fluid
- secondary separator
- Prior art date
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 38
- 238000000746 purification Methods 0.000 title abstract description 13
- 238000000034 method Methods 0.000 title description 6
- 239000012535 impurity Substances 0.000 claims abstract description 28
- 238000004140 cleaning Methods 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000005119 centrifugation Methods 0.000 claims description 9
- 238000011282 treatment Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000295 complement effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- SGPGESCZOCHFCL-UHFFFAOYSA-N Tilisolol hydrochloride Chemical compound [Cl-].C1=CC=C2C(=O)N(C)C=C(OCC(O)C[NH2+]C(C)(C)C)C2=C1 SGPGESCZOCHFCL-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/23—Supported filter elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/39—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type
- B01D29/41—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type mounted transversely on the tube
- B01D29/413—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with hollow discs side by side on, or around, one or more tubes, e.g. of the leaf type mounted transversely on the tube divided in sectors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
- B01D29/682—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with a rotary movement with respect to the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
- B01D29/688—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles with backwash arms or shoes acting on the cake side
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/02—Combinations of filters of different kinds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
- F01M2001/1028—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the type of purification
- F01M2001/1035—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the type of purification comprising centrifugal filters
Definitions
- IPC International Patent Classification
- the present invention relates to an assembly for the automatic purification of a polluted fluid as well as to a method of implementing said assembly.
- the invention relates more particularly to the treatment of oils and gas oils for internal combustion engines.
- Patent FR 2 725 917 describes a fluid treatment assembly comprising a main separator provided with a cleaning device supplied against the current by a fraction of the purified fluid, and a secondary separator supplied via the outlet pipe of said device cleaning by said fraction loaded with impurities.
- the secondary separator consists of only one centrifuge with a constant processing capacity. This capacity is fixed once and for all to the construction, and is adapted to the average flow rate of the fraction of fluid loaded with impurities to be treated which comes from the outlet pipe of the cleaning device.
- This flow rate is itself dependent on the total flow rate of polluted fluid coming from the engine.
- the polluted fluid flow rate can vary in significant proportions, in particular as a function of the engine load and exceed the expected values.
- a non-negligible fraction of highly polluted fluid then returns to the tank, which can ultimately lead to fouling of the engine fluid circuits and, consequently, to mechanical or hydraulic failures.
- the centrifuge can only separate impurities with a specific density which generally corresponds to precise values of the pressure and speed parameters.
- the impurities are not systematically separated.
- the efficiency of the secondary separator is thus significantly reduced. This again results in fouling problems and the risk of premature wear or breakdowns.
- the present invention aims to satisfactorily solve the technical problems stated above, by adjusting the capacity and the selectivity of the secondary separator respectively to the flow rates to be treated and to the density of the impurities.
- an assembly for the automatic and continuous purification of a polluted fluid comprising a main separator provided with a cleaning device supplied against the current by a fraction of the purified fluid and a secondary separator supplied via the outlet pipe of said cleaning device by said fraction of fluid loaded with impurities, characterized in that said secondary separator comprises the combination of a centrifugation device and a filtration device, the capacity and selectivity of which are variable as a function, on the one hand, the flow rate of said fraction of fluid loaded with impurities and, on the other hand, the range of densities of said impurities.
- said centrifuge device and said filtration device are mounted in parallel on the outlet pipe of the cleaning device.
- said centrifugation device comprises at least one and preferably two centrifuges in parallel.
- said filtration device comprises at least one filter with filtering walls.
- the outlet pipe of the cleaning device is equipped with a multi-way valve making it possible to isolate at least part of the centrifugation device and / or of the filtration device.
- the secondary separator and said main separator are enclosed inside a single casing.
- the outlet pipe of the cleaning device has a straight upstream section which extends coaxial with the longitudinal axis of the main separator and which divides into two divergent or opposite downstream branches, each supplying part of the secondary separator.
- said secondary separator is arranged transversely to the main separator.
- said secondary separator and said main separator are arranged side by side.
- Another object of the invention is a process for the automatic and continuous purification of a polluted fluid comprising the retention of impurities in a main separator, the cleaning of the main separator against the current by a fraction of the purified fluid and the entrainment of said fraction of the fluid charged with impurities towards a secondary separator where the impurities are extracted, characterized in that the centrifuge and filtration of said fraction charged with impurities are carried out in the secondary separator, and in that the capacity is adjusted and the selectivity of the secondary separator as a function respectively of the flow rate of said fraction charged with impurities and the density of said impurities.
- the capacity and the selectivity of the secondary separator are regulated by feeding it or isolating it automatically, in whole or in part.
- the purification assembly as well as the method of the invention make it possible to obtain a thorough separation of the impurities with a wide spectrum of densities whatever the flow of polluted fluid to be treated.
- the regulation and adaptation of the operating regime of the secondary separator to the characteristics of the polluted fluid to be purged are carried out automatically.
- the combination within the secondary separator of a filter and a centrifuge guarantees a high rate of clarification of the fluid.
- all the components of the purification unit are enclosed in a single casing according to ergonomic arrangements which offer a minimum bulk.
- FIG. 3 shows a partial sectional view of an alternative embodiment of the secondary separator of the invention.
- the treatment assembly shown in the figures is intended for the automatic and continuous purification of a polluted fluid P (such as a lubricating agent, oil, etc.) derived, for example, from an internal combustion engine.
- a polluted fluid P such as a lubricating agent, oil, etc.
- This fluid once rid of the impurities which it has taken care of during use, must be recovered and possibly recycled in the form of a purified fluid E.
- the purification assembly comprises a main separator 1 enclosed in a casing C, and consisting, for example, of a series of filter elements 10 joined in the form of a stack.
- the filter elements 10 are shaped here as discs, the two faces 10a, 10b of which include screens.
- the main separator 1 is provided with a cleaning device
- the cleaning device 11 is supplied against the current by a fraction of the purified fluid E ⁇ , making it possible to unclog the filter elements and to entrain the impurities which were retained therein in a fraction F of said fluid.
- the purification assembly also includes a secondary separator 2 supplied via the outlet pipe 12 of the cleaning device 11 by the fraction F of fluid loaded with impurities.
- the main separator 1 and the secondary separator 2 are enclosed in a single casing C.
- the secondary separator has the function of extracting the greatest possible amount of impurities present in fraction F so as to restore a minority fraction E2 of purified fluid, suitable for joining the fluid reservoir or for being directly recycled in the engine with the majority fraction E of fluid purified by the main separator 1.
- the flow of polluted fluid P to be treated in the main separator 1 may vary. This variation leads to differences in flow rates for fraction F. When these differences result in a significant increase in the flow rate for fraction F, the secondary separator
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Centrifugal Separators (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU17651/99A AU1765199A (en) | 1997-12-19 | 1998-12-17 | Assembly for automatic purification of a polluted fluid and implementing method |
US09/581,805 US6368513B1 (en) | 1997-12-19 | 1999-12-17 | Filtering assembly and method including removal of impurities from a backwash fluid |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR97/16148 | 1997-12-19 | ||
FR9716148A FR2772636B1 (fr) | 1997-12-19 | 1997-12-19 | Ensemble pour l'epuration automatique d'un fluide pollue et procede de mise en oeuvre |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999032210A1 true WO1999032210A1 (fr) | 1999-07-01 |
Family
ID=9514837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1998/002760 WO1999032210A1 (fr) | 1997-12-19 | 1998-12-17 | Ensemble pour l'epuration automatique d'un fluide pollue et procede de mise en oeuvre |
Country Status (4)
Country | Link |
---|---|
US (1) | US6368513B1 (fr) |
AU (1) | AU1765199A (fr) |
FR (1) | FR2772636B1 (fr) |
WO (1) | WO1999032210A1 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6884348B2 (en) * | 2000-10-25 | 2005-04-26 | Hengst Gmbh & Co. Kg | Module of units for an internal combustion engine |
CN102350402A (zh) * | 2011-06-02 | 2012-02-15 | 江苏巴威工程技术股份有限公司 | 一种离心式油净化装置的控制系统 |
CN110404327A (zh) * | 2018-04-27 | 2019-11-05 | 芜湖美的厨卫电器制造有限公司 | 复合滤芯以及净水设备 |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2348830A (en) * | 1999-04-12 | 2000-10-18 | Federal Mogul Eng Ltd | Liquid cleaning arrangement including duplex filter and centrifugal separator therefor |
US20040104159A1 (en) * | 2000-06-13 | 2004-06-03 | Julian Terrazas Benavides | Washable, non-disposable ecological filter for lubricant and fuels |
US7081206B2 (en) * | 2002-07-31 | 2006-07-25 | Investors Precision Manufacturing, Inc. | Filter apparatus and method with centrifugal separator for removing contaminants from a fluid |
CN100409794C (zh) * | 2006-04-22 | 2008-08-13 | 隆全明 | 一种冲浪按摩浴缸 |
US8512555B1 (en) | 2006-08-23 | 2013-08-20 | Contech Engineered Solutions LLC | Filter assembly, system and method |
KR20120081116A (ko) * | 2009-09-09 | 2012-07-18 | 콘텍 엔지니어드 솔루션스 엘엘씨 | 우수 여과 장치, 시스템 및 방법 |
WO2012030423A1 (fr) * | 2010-09-02 | 2012-03-08 | Fujifilm Planar Solutions, LLC | Procédé et système de nettoyage |
CN103370117A (zh) * | 2010-12-16 | 2013-10-23 | 阿米亚德过滤系统公司 | 过滤系统以及用于其的部件 |
CN102974161A (zh) * | 2011-09-05 | 2013-03-20 | 田菱精细化工(昆山)有限公司 | 过滤装置的改良结构 |
DE102011086670A1 (de) * | 2011-11-18 | 2013-05-23 | Man Diesel & Turbo Se | Schmierölnebenstromreinigungsvorrichtung |
US9839864B2 (en) | 2015-10-27 | 2017-12-12 | Jeff Mason | Enclosed media fluid filtration device |
KR101876129B1 (ko) * | 2017-06-15 | 2018-07-06 | 두산중공업 주식회사 | 필터 자동 세척 장치 및 이를 이용한 필터 자동 세척 방법 및 이를 포함하는 초임계 유체 발전 시스템 |
CN112554992A (zh) * | 2020-11-04 | 2021-03-26 | 李冬菊 | 一种汽车机油净化用滤清器 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2725917A1 (fr) * | 1994-10-19 | 1996-04-26 | Moatti Filtration | Ensemble de traitement d'un fluide par filtration et centrifugation |
GB2297499A (en) * | 1995-02-02 | 1996-08-07 | Glacier Metal Co Ltd | Liquid cleaning system including back-flushing filter and centrifugal cleaner therefor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3241676A (en) * | 1962-08-09 | 1966-03-22 | Kimberly Clark Co | Dewatering method and apparatus |
US5296137A (en) * | 1992-03-12 | 1994-03-22 | Oil-Dri Corporation Of America | Filtration system with axial flow cartridge |
DE19606182A1 (de) * | 1996-02-20 | 1997-08-21 | Mann & Hummel Filter | Abtrennvorrichtung |
-
1997
- 1997-12-19 FR FR9716148A patent/FR2772636B1/fr not_active Expired - Fee Related
-
1998
- 1998-12-17 WO PCT/FR1998/002760 patent/WO1999032210A1/fr active Search and Examination
- 1998-12-17 AU AU17651/99A patent/AU1765199A/en not_active Abandoned
-
1999
- 1999-12-17 US US09/581,805 patent/US6368513B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2725917A1 (fr) * | 1994-10-19 | 1996-04-26 | Moatti Filtration | Ensemble de traitement d'un fluide par filtration et centrifugation |
US5674392A (en) * | 1994-10-19 | 1997-10-07 | Moatti Filtration S.A. | Treatment assembly for treating a fluid by filtering and centrifuging |
GB2297499A (en) * | 1995-02-02 | 1996-08-07 | Glacier Metal Co Ltd | Liquid cleaning system including back-flushing filter and centrifugal cleaner therefor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6884348B2 (en) * | 2000-10-25 | 2005-04-26 | Hengst Gmbh & Co. Kg | Module of units for an internal combustion engine |
CN102350402A (zh) * | 2011-06-02 | 2012-02-15 | 江苏巴威工程技术股份有限公司 | 一种离心式油净化装置的控制系统 |
CN110404327A (zh) * | 2018-04-27 | 2019-11-05 | 芜湖美的厨卫电器制造有限公司 | 复合滤芯以及净水设备 |
CN110404327B (zh) * | 2018-04-27 | 2023-09-01 | 芜湖美的厨卫电器制造有限公司 | 复合滤芯以及净水设备 |
Also Published As
Publication number | Publication date |
---|---|
FR2772636A1 (fr) | 1999-06-25 |
AU1765199A (en) | 1999-07-12 |
US6368513B1 (en) | 2002-04-09 |
FR2772636B1 (fr) | 2000-07-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO1999032210A1 (fr) | Ensemble pour l'epuration automatique d'un fluide pollue et procede de mise en oeuvre | |
US4698156A (en) | Rotating filter apparatus for separating fine particles of solids from a liquid | |
FR2835764A1 (fr) | Installation de cyclones commutable pour separer des particules ou des gouttelettes d'une veine de fluide, notamment pour un vehicule automobile | |
EP0712654B1 (fr) | Dispositif de séparation et de filtrage de particules dans un débit de fluide | |
FR2484859A1 (fr) | Dispositif pour eliminer des impuretes d'un fluide, ensemble a filtre et separateur pour combustible et cartouche amovible destinee a un tel ensemble | |
FR2933626A1 (fr) | Dispositif avec rotor a media coalesceur pour separer l'huile des gaz de carter d'un moteur a combustion interne. | |
FR2491512A1 (fr) | Procede pour le fractionnement de matiere fibreuse produite a partir de vieux papiers et installation pour la mise en oeuvre dudit procede | |
CA1331956C (fr) | Dispositif pour la separation selective de particules dans un liquide, notamment pour l'epuration de suspensions papetieres | |
FR2617516A1 (fr) | Appareil de repartition d'une pate cellulosique fibreuse | |
EP0104966B1 (fr) | Centrifugeuse à récupération d'énergie | |
FR2460701A1 (fr) | Dispositif de separation de matieres solides dans un courant de liquide | |
US6090276A (en) | Integrated closed loop centrifugal separator and filter to remove solids from a liquid stream | |
EP2010304A2 (fr) | Dispositif de filtration d'huile pour un moteur a combustion interne et moteur comportant un tel dispositif | |
EP0246943B1 (fr) | Procédé et installation pour faire circuler des fluides par pompage | |
FR2640161A1 (fr) | Filtre a cyclone | |
FR2866527A1 (fr) | Table de tri pour la vendange | |
EP0108684B2 (fr) | Installation et procédé de séparation des constituants d'une suspension | |
FR2514411A1 (fr) | Procede et equipement pour regenerer en fonctionnement les huiles de graissage | |
EP0097548A1 (fr) | Groupe motopompe pour puits de forage et procédé de protection s'y rapportant | |
FR2929985A1 (fr) | Dispositif separateur dote d'un media filtrant, destine a separer l'huile des gaz de carter d'un moteur a combustion interne | |
FR2626197A1 (fr) | Centrifugeuse pour la separation de melanges de liquides | |
FR2831076A1 (fr) | Installation pour filtrer des liquides souilles | |
FR2783722A1 (fr) | Ensemble de traitement d'un fluide avec controle de la temperature du fluide pollue au niveau de l'element filtrant | |
SU1194460A1 (ru) | Способ центробежного фильтровани | |
JPS6150003B2 (fr) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GD GE GH GM HR HU ID IL IN 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 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 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) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 09581805 Country of ref document: US |
|
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 | ||
NENP | Non-entry into the national phase |
Ref country code: CA |
|
DPE2 | Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101) |