WO2000015733A1 - Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly - Google Patents
Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly Download PDFInfo
- Publication number
- WO2000015733A1 WO2000015733A1 PCT/GB1999/002921 GB9902921W WO0015733A1 WO 2000015733 A1 WO2000015733 A1 WO 2000015733A1 GB 9902921 W GB9902921 W GB 9902921W WO 0015733 A1 WO0015733 A1 WO 0015733A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shell
- cooling
- tube
- vent pipe
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/10—Cooling or quenching coke combined with agitating means, e.g. rotating tables or drums
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B39/00—Cooling or quenching coke
- C10B39/02—Dry cooling outside the oven
Definitions
- the present invention relates to a rotary drum cooler for cooling particulate or granular material and in one aspect relates to a rotary drum cooler for cooling particulate material such as petroleum coke wherein the shell of the cooler has at least one improved cooling pocket which, in turn, includes a vent tube which is free to expand and contract with respect to the shell in response to changes in temperatures during cooling operations to thereby prevent damage (e.g. cracking) to the pocket-to-shell weld ents due to thermal and fatigue stresses.
- damage e.g. cracking
- particulate or granular material is treated at high-temperatures in a retort or the like to produce a desired end product.
- petroleum coke is typically treated by heating crushed "green coke” in a calciner (e.g. rotary kiln or oven) to remove substantially all of the residual hydrocarbons from the coke thereby producing "calcined coke” (i.e. substantially pure carbon) . Since the temperatures in these calciners reach extremely, high- temperatures (e.g. 2000 c F. or greater), the particles of the calcined coke are usually white-hot and glowing as they exit from the calciner. The calcined coke must then be cooled before it undergoes further handling..
- a calciner e.g. rotary kiln or oven
- rotary drum coolers (often referred to as “coke cooling rotors", these terms used interchangeably herein) are commonly used for this purpose.
- a rotary drum cooler or coke cooling rotor is comprised of a shell (also sometimes referred to as the "drum” or “rotor”; also used interchangeably herein) which rotates within a housing which, in turn, has a water-bath in the bottom thereof.
- the hot coke enters one end of the drum or shell and the rotation of the shell causes the coke to move towards the other end where lifters pick up and carry the coke out of the drum.
- the cooling pockets are individual units which are positioned and temporarily secured (e.g. fillet welded) within respective slots along the drum.
- Each substantially trapezoidal-shaped pocket has an opening at one end through which the pocket fills with cooling water as the drum rotates through the water bath in the housing.
- the pocket has a vent pipe or tube (sometimes also called “drain pipe”) at its other end which vents the pocket during filling.
- the open end of the pocket is secured in its slot by a plate which is welded to both the pocket and the wall of the shell.
- the vent pipe at the other end of the pocket passes through an opening in the wall of the shell and is rigidly secured thereto by spot welding a flange or the like around the outer end of the vent pipe and to the surface of the shell.
- the present invention provides a rotary drum cooler for cooling particulate material (e.g. coke particles) having at least one cooling pocket which, in turn, has a flexible vent pipe which can slide in relation to the shell of the cooler. By making the vent pipe slidable, it can move in response to the expansion and contraction experienced by the pocket within the shell due to changes in temperature during a cooling operation.
- particulate material e.g. coke particles
- the present invention provides a rotary drum cooler which is comprised of a housing adapted to have a bath of cooling liquid (e.g. water) in the lower portion thereof.
- An elongated shell is rotatably mounted in the housing and has an inlet at one end for receiving the particulate material to be cooled.
- the shell has an outlet at its other end through which the particulate material is removed after it has passed through the shell.
- At least one cooling pocket (preferably a plurality) is positioned within openings or slots along the length of the shell whereby the sides of each cooling pocket will be in direct contact with the hot, particulate material as it moves through the shell.
- Each pocket is open at one end whereby the pocket can be filled with cooling liquid as each pocket in the shell is rotated through the cooling bath.
- a flexible, vent pipe assembly is provided on the other end of each pocket through which the cooling liquid can vent from the pocket after the cooling liquid has been heat-exchanged with the hot particulate material within the shell during the rotation of the shell. This vent pipe assembly also allow air to escape from the pocket as the pocket is being filled with cooling liquid.
- a baffle can be provided within the pocket near the open end thereof to retard the flow of cooling liquid back out the open end during rotation.
- the flexible vent pipe assembly is comprised of a tube which is slidably positioned through an aperture in the shell.
- the tube has an inner end which is affixed to and is in fluid communication with the other end of the pocket.
- the vent pipe assembly includes a flexible means for sealingly connecting the outer end of the tube to the shell so that the tube can slide within the aperture in the shell as the pocket expands/contracts within the shell due to changes in temperature during a cooling operation.
- the flexible means is comprised of a flange affixed to the shell around the aperture and a retainer which is threaded or welded onto the outer end of the tube with a seal (e.g. an O- ring) positioned between the flange and the retainer.
- the seal is comprised of a bellows which is connected between the flange and the retainer while in another embodiment, the seal is comprised of a flexible sleeve (e.g. rubber sleeve ) which is connected between the flange and the retainer.
- a flexible sleeve e.g. rubber sleeve
- FIG. 1 is an elevational view, partly in section, of a typical drum cooler in accordance with the present invention
- FIG. 2 is an end view, partly in section of the drum cooler of FIG. 1;
- FIG. 3 is an enlarged, plan view of a section of the wall of the drum cooler of FIG. 1;
- FIG. 4 is a sectional view taken along line 4-4 of FIG. 1;
- FIG. 5 is a sectional view taken along line 5-5 of FIG. 4;
- FIG. 5A is a sectional view taken along line 5A-5A of FIG.
- FIG. 6 is an enlarged, sectional view of the flexible vent pipe assembly of the cooling pocket of FIG. 5;
- FIG. 7 is an exploded, sectional view of the components of the flexible vent pipe assembly of FIG. 6;
- FIGS. 8, 9, and 10 are all sectional views of further embodiments of the flexible vent pipe assembly for a cooling pocket in accordance with the present invention.
- Rotary cooler 16 is comprised of an elongated drum or shell 20 which is rotatably mounted within a housing 18.
- Shell 20 is preferably octagonal in cross-section and is closed at either end by frusto-conical end caps 22a, 22b.
- An ir.let duct 24 is connected to end cap 22b through which hot granulated or crushed material (e.g.. coke particles, not shown) is passed from an inlet chute, also not shown, into drum 20.
- An outlet duct 26 having auger flights 28 secured therein passes through the other end cap 22a and provides an outlet for the
- the shell 20 is mounted for rotation about a central longitudinal axis 19
- Housing 18 has a bath of cooling liquid (e.g. water) 40 in the bottom or lower portion thereof .
- Housing may also include a suitable nozzle array (not shown) for spraying cooling fluid
- the cooling pockets 42, 44, 46, and 48, as well as the components of the shell 20 which support these pockets, are all of similar construction except for the relative size of the respective pockets. That is, the pockets 44, 46, and 48 are of somewhat narrower and deeper configuration in varying degrees than are pockets 42 to thereby maximize the heat transfer surfaces on the respective pockets. Otherwise, the construction of all of the plates which make up shell 20 and which support the cooling pockets is basically the same as will now be described.
- shell 20 is made up of opposed pairs of metal plates 21, 23, 25, and 27 (e.g.. carbon steel and/or stainless-clad steel plates) which are bent along respective fold lines (e.g. 21a-21d in FIG. 3) so that when the plates are welded together along their opposed parallel edges (e.g. 21e, 21f in FIG. 3), they form the desired octagonal cross-section of shell 20.
- metal plates 21, 23, 25, and 27 e.g.. carbon steel and/or stainless-clad steel plates
- each plate Prior to the bending and welding of the respective plates, specially-designed openings are formed in each plate for receiving the respective cooling pockets. As shown in FIG. 3, an elongated slot 50 for a particular pocket is formed in one plate while an aligned, smaller aperture 52 for the same pocket is formed in the opposed plate so that when a pocket (to be described below) is inserted through its slot 50, the vent pipe of that pocket will pass through its respective, aligned aperture 52 in the opposed plate, i.e. on the other side of the shell.
- Each of the cooling pockets 42, 44, 46, and 48 are of the basically the same construction and vary primarily only in size.
- a typical pocket 42 is made up of a pair of trapezoidal-shaped steel plates 74 which are bent and welded together to form the oval-shaped tubular space 62
- FIG. 5 this being the space which will hold the cooling water when in operation.
- Supports or webs B4 or the like may be positioned and welded between the plates to add rigidity to the pocket 42 where needed.
- the pocket is open at one end (e.g. opening 60) to receive a cooling liquid (e.g. water) from bath
- a cooling liquid e.g. water
- vent pipe 18 is closed at the other end 86, which, in turn, has an opening adapted to receive the vent pipe.
- the vent pipe When pocket 42 is in its operable position within shell 20, the vent pipe will extend through its respective aperture 52 in the wall of shell 20.
- vent pipe for each pocket is sized so that the air in each pocket is allowed to escape while the pocket is filling.
- the vent pipe is located at the upper corner of the pocket so that it serves as a high point vent. This allows the cooling water to readily flow into space 62 within the pocket since the vent pipe also provides a vent for the otherwise trapped air and water vapor in the "empty" pocket.
- shell 20 is constructed with slots 50 and vent apertures 52 properly aligned in opposed plates.
- the cooling pockets 42, 44, 46, and 48 are then inserted through their respective slots 50 until the vent pipe on each pocket extends through its respective aligned aperture 52 on the other side of shell 20.
- the vent pipe of each pocket passes through its aperture 52, the front edge of the pocket moves in between a respective pair of locator plates 70, which, in turn, are welded to the inside of shell 20. Plates 70 helps to align the pocket and aids in maintaining the pocket in its operational position within shell 20 during cooling operations.
- plates 70 may be replaced by a plug weld or the like.
- the vent pipe is firmly affixed directly to the wall of the shell by a flange which is welded to both the ver.t pipe and to the wall of the shell.
- the vent pipe is not free to expand and/or contract in response to the temperature changes normally experienced during the cooling operation. Since the vent tube can not expand and contract (i.e. lengthen and shorten) as the pocket expands and contracts, thermally induced stress cracks and fractures are likely to occur in the pocket to shell weldment. It and when this happens, water can leak into the shell and, as will be understood in the art, this usually results in considerable downtime and substantial increases in the maintenance costs of the cooling operation.
- the vent pipe assembly 64 for each cooling pocket is comprised of a flexible, vent pipe assembly 64 which allows the cooling pocket to freely expand and contract in response to temperature changes encountered during the cooling operation.
- flexible vent pipe assembly 64 is comprised of a conduit or tube 70 having its inner end firmly affixed and secured within an opening in the upper corner of a cooling pocket 42 by welds 71 or the like (FIG. 6) to thereby provide a vent outlet for the pocket.
- the outer end of tube 70 slidably extends through aperture 52 in shell 20 and through a smooth- bored, circular flange 72, which, in turn, is secured directly to the wall of shell 20 around aperture 52 by welds 73 or the like.
- conduit 70 The outer length 78 of conduit 70 is threaded to receive internally-threaded, retainer or retainer 75.
- An O-ring seal 76 or the like is positioned in a groove formed by recesses 77a in flange 72 and 77b in retainer 75 (FIG. 7) to prevent leakage of water into shell 20 between the flange 72 and collar 75 when the vent pipe assembly 64 is in its assembled position on shell 20.
- tube 70 provides fluid communication between the space 62 and the exterior of the pocket.
- the threaded end of tube 70 will pass through its respective aperture 52 on the other side of shell 20 and will extend through both the aperture 52 and flange 72 which, in turn, has been secured to the shell around opening 52.
- Retainer 75 is then threaded onto tube 70 (with O-ring 76 in place) to snugly secure the vent pipe assembly 64 to shell 20.
- FIGS. 8, 9, and 10 all disclose further embodiments of the flexible, vent pipe assembly of the present invention.
- flexible, vent pipe assembly 64a is comprised of a conduit 70a which has its inner end secured within an opening in cooling pocket 42a by welds 71a or the like.
- the outer end of conduit 70a extends through aperture 52a in the wall of shell 20a and through flange 72a which, in turn, is affixed to the wall of shell 20a by welding or the like.
- a retainer 75a is fixed to the outer end of conduit 70a by welds 80 or other means (e.g. threads, not shown) and is slidably positioned over retainer 70a with an O-ring seal 76a or the like therebetween. It can be seen that since conduit 70a is free to slide within both the aperture 52a and the flange 75a and since retainer 75a is free to slide relative to flange 72a, the conduit can readily expand and contract in response to changes in temperature without inducing any substantial stresses in the vent pipe.
- the embodiment 64b of FIG. 8 is basically the same as that shown in FIG. 9 except a flexible sealing sleeve 81 (e.g. rubber) is secured at one end to flange 72a by a band 82 or the like and at its other end to retainer 75b by band 83 or the like to further guard against leakage of water between the flange and the retainer from the pocket into the shell.
- a flexible sealing sleeve 81 e.g. rubber
- flexible vent pipe assembly 64c is comprised of a conduit 70c which has one end secured within an opening in cooling pocket 42c by welds 71c or the like.
- the other end of conduit 70c extends through aperture 52c in shell 20c and through flange 72c which, in turn, is secured to the wall of shell 20c by welds or the like.
- a retainer 75c is secured to the outer end of conduit 75c by penetration welds 84 or the like or by some other means (e.g. threads, not shown).
- An expandable seal (e.g....
- bellows 88 is connected to the inner surfaces of flange 72c and retainer 75c so that conduit 70c is free to expand and contract through aperture 52c in shell 20c in response to changes in temperature of the cooling pocket within shell 20.
- a cover sleeve 89 which protects bellows 88, is positioned between flange 72c and retainer 75c but is affixed at only one end (shown welded to flange 72c in FIG. 10) so that sleeve 89 is free to move as vent pipe 70c expands or contracts with the pocket during the cooling operation.
- the flexible, vent pipe assembly of the present invention allows the vent pipe to slide with respect to the shell as its respective cooling pocket undergoes expansion and contraction (i.e. filling and emptying of the pocket with water) during the rotation of the cooler shell. This relieves any thermally-induced stresses within the cooling pocket which otherwise might cause cracks in the pocket- to shell weldments and the problems normally related thereto and reduces the probability one or more welds may fail during the cooling operations; thereby substantially reducing downtime normally encountered in coolers of this type and the maintenance costs involved therewith. Also, in the present invention, one or more baffles 90
- each pocket 42-48 may be affixed to the bottom, inside of each pocket 42-48 as viewed in FIGS. 4 and 5A) at open end 60 to retard the flow of cooling liquid back through the filling opening 60 after a pocket has been filled and is rotated from the water bath through the upper portion of housing 18.
- vent pipes may be provided for some of the pockets to allow quicker and more complete venting of the pockets, if needed.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Details Of Garments (AREA)
- Coke Industry (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99943121A EP1114121A1 (en) | 1998-09-11 | 1999-09-03 | Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly |
CA002343224A CA2343224C (en) | 1998-09-11 | 1999-09-03 | Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly |
NO20011223A NO329418B1 (en) | 1998-09-11 | 2001-03-09 | Dress pocket for a rotating drum dress that has a flexible ventilation pipe arrangement |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/152,093 | 1998-09-11 | ||
US09/152,093 US6143137A (en) | 1998-09-11 | 1998-09-11 | Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000015733A1 true WO2000015733A1 (en) | 2000-03-23 |
Family
ID=22541485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/002921 WO2000015733A1 (en) | 1998-09-11 | 1999-09-03 | Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly |
Country Status (5)
Country | Link |
---|---|
US (1) | US6143137A (en) |
EP (1) | EP1114121A1 (en) |
CA (1) | CA2343224C (en) |
NO (1) | NO329418B1 (en) |
WO (1) | WO2000015733A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2448143C2 (en) * | 2009-12-02 | 2012-04-20 | Закрытое акционерное общество "Научно-производственное объединение "Восточный научно-исследовательский углехимический институт" (ЗАО "НПО "ВУХИН") | Method of cooling coke while sorting said coke according to grain-size category and apparatus for realising said method |
CN106595279A (en) * | 2016-11-29 | 2017-04-26 | 天华化工机械及自动化研究设计院有限公司 | Semicoke heat recovery method for rotary residue heat boiler |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2608561T3 (en) * | 2014-05-19 | 2017-04-12 | Kima Echtzeitsysteme Gmbh | Cooling system for rotary ovens |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0149798A2 (en) * | 1983-12-22 | 1985-07-31 | PKA Pyrolyse Kraftanlagen GmbH | Rotary kiln for the pyrolysis of wastes |
DE4326678A1 (en) * | 1993-08-09 | 1995-02-16 | Siemens Ag | Heating chamber with internal heating pipes |
US5622604A (en) * | 1995-02-27 | 1997-04-22 | Atlantic Richfield Company | Coke cooling apparatus |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2899176A (en) * | 1959-08-11 | Heat exchanger | ||
DE2315024C3 (en) * | 1973-03-26 | 1979-09-20 | Linde Ag, 6200 Wiesbaden | Coke cooler |
US4044824A (en) * | 1974-12-30 | 1977-08-30 | Michael Eskeli | Heat exchanger |
US4597773A (en) * | 1983-01-24 | 1986-07-01 | Texaco Development Corporation | Process for partial oxidation of hydrocarbonaceous fuel and recovery of water from dispersions of soot and water |
US4557804A (en) * | 1984-05-18 | 1985-12-10 | Triten Corporation | Coke cooler |
US4667731A (en) * | 1985-09-13 | 1987-05-26 | Triten Corporation | Coke cooler |
GB2195424B (en) * | 1986-09-29 | 1990-04-25 | Triten Corp | Coke cooler |
US4747913A (en) * | 1986-10-31 | 1988-05-31 | Atlantic Richfield Company | Cooling apparatus for granular coke material |
SE500956C2 (en) * | 1991-01-17 | 1994-10-10 | Ssab Tunnplaat Ab | Blast position with carbon injection lance |
US5927970A (en) * | 1996-10-02 | 1999-07-27 | Onsite Technology, L.L.C. | Apparatus for recovering hydrocarbons from solids |
-
1998
- 1998-09-11 US US09/152,093 patent/US6143137A/en not_active Expired - Lifetime
-
1999
- 1999-09-03 WO PCT/GB1999/002921 patent/WO2000015733A1/en not_active Application Discontinuation
- 1999-09-03 CA CA002343224A patent/CA2343224C/en not_active Expired - Fee Related
- 1999-09-03 EP EP99943121A patent/EP1114121A1/en not_active Withdrawn
-
2001
- 2001-03-09 NO NO20011223A patent/NO329418B1/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0149798A2 (en) * | 1983-12-22 | 1985-07-31 | PKA Pyrolyse Kraftanlagen GmbH | Rotary kiln for the pyrolysis of wastes |
DE4326678A1 (en) * | 1993-08-09 | 1995-02-16 | Siemens Ag | Heating chamber with internal heating pipes |
US5622604A (en) * | 1995-02-27 | 1997-04-22 | Atlantic Richfield Company | Coke cooling apparatus |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2448143C2 (en) * | 2009-12-02 | 2012-04-20 | Закрытое акционерное общество "Научно-производственное объединение "Восточный научно-исследовательский углехимический институт" (ЗАО "НПО "ВУХИН") | Method of cooling coke while sorting said coke according to grain-size category and apparatus for realising said method |
CN106595279A (en) * | 2016-11-29 | 2017-04-26 | 天华化工机械及自动化研究设计院有限公司 | Semicoke heat recovery method for rotary residue heat boiler |
CN106595279B (en) * | 2016-11-29 | 2019-05-31 | 天华化工机械及自动化研究设计院有限公司 | Rotary waste heat boiler semicoke heat recovery method |
Also Published As
Publication number | Publication date |
---|---|
NO20011223L (en) | 2001-05-10 |
US6143137A (en) | 2000-11-07 |
NO20011223D0 (en) | 2001-03-09 |
CA2343224A1 (en) | 2000-03-23 |
NO329418B1 (en) | 2010-10-18 |
CA2343224C (en) | 2009-04-07 |
EP1114121A1 (en) | 2001-07-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0506151B1 (en) | Cooling system for furnace roof having a removable inner part | |
US6802671B1 (en) | Installation for very long term storage of heat-generating products such as nuclear waste | |
US8602089B2 (en) | Heat exchanger apparatus for accommodating thermal and/or pressure transients | |
US7575043B2 (en) | Cooling arrangement for conveyors and other applications | |
CA2485686C (en) | Conveyor with heat transfer arrangement | |
US5327453A (en) | Device for relief of thermal stress in spray cooled furnace elements | |
US3917516A (en) | Coke-cooling apparatus | |
JPH05179327A (en) | Apparatus for cooling distribution shoot of feeding apparatus for blast furnace | |
US6143137A (en) | Cooling pocket for a rotary drum cooler having a flexible vent pipe assembly | |
BR9807956B1 (en) | delayed coking process, and method for reducing matte stresses in a coke drum. | |
US5350011A (en) | Device and method for thermally insulating a structure to prevent thermal shock therein | |
JP5934569B2 (en) | Heat exchanger with protective member | |
EP2577208B1 (en) | A flue gas air preheater, and a method for installation, as well as an air pipe component for a flue gas air preheater | |
US4969937A (en) | Vertically tiered particle filtering apparatus | |
US4102652A (en) | Modular construction for a large catalytic reaction apparatus | |
US5313914A (en) | Potable hot water storage vessel and direct-fired heat exchanger | |
US3903963A (en) | Heat exchanger | |
US5622604A (en) | Coke cooling apparatus | |
US4279296A (en) | Segmented ring header | |
US2936159A (en) | Compartmentized heat exchanger construction | |
NO334921B1 (en) | Pipe plate and pipe protection device | |
CA1115953A (en) | Chute for charging vessels | |
US6638471B1 (en) | Water cooled vessel for vacuum processing liquid steel | |
JPS6349591B2 (en) | ||
JPH05141881A (en) | Structure of jacket |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CA MW NO |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
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: 1999943121 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2343224 Country of ref document: CA Ref country code: CA Ref document number: 2343224 Kind code of ref document: A Format of ref document f/p: F |
|
WWP | Wipo information: published in national office |
Ref document number: 1999943121 Country of ref document: EP |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1999943121 Country of ref document: EP |