WO1989012506A1 - A decanter centrifuge - Google Patents

A decanter centrifuge Download PDF

Info

Publication number
WO1989012506A1
WO1989012506A1 PCT/DK1989/000151 DK8900151W WO8912506A1 WO 1989012506 A1 WO1989012506 A1 WO 1989012506A1 DK 8900151 W DK8900151 W DK 8900151W WO 8912506 A1 WO8912506 A1 WO 8912506A1
Authority
WO
WIPO (PCT)
Prior art keywords
bowl
gear
revolutions
conveyor
centrifuge
Prior art date
Application number
PCT/DK1989/000151
Other languages
English (en)
French (fr)
Inventor
Jan Cederkvist
Bjarne Goddik
Original Assignee
Alfa-Laval Separation A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8122268&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO1989012506(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Alfa-Laval Separation A/S filed Critical Alfa-Laval Separation A/S
Priority to DE1989604197 priority Critical patent/DE68904197T2/de
Publication of WO1989012506A1 publication Critical patent/WO1989012506A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
    • B04B9/08—Arrangement or disposition of transmission gearing ; Couplings; Brakes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing

Definitions

  • This invention relates to a decanter centrifuge comprising a rotatably journalled bowl and a rotatable screw conveyor journalled in the bowl and of the type in which the conveyor is connected with the bowl through a reduction gear provided with a housing corotating with the bowl, a driven shaft connected with the conveyor, and a drive shaft whose number of revolutions determines the relative number of revolutions of the conveyor relative to the bowl.
  • Such decanter centrifuges are used for separating a liquid/solids mixture supplied to the interior of the bowl into a solids phase and one or more liquid phases.
  • the separating effect of the centrifuge and its capacity depend on the number of revolutions and the inner diameter of the bowl and on the length of the separating space in such a manner that an increase of each of said parameters, other things being equal, will cause an increase of the separating effect and/or the capacity.
  • the separating effect and the capacity of the centrifuge are, however, restricted by the critical number of revolutions of the rotating system and is further limited in practice in that an allowable maximum number of revolutions which is somewhat lower than the critical number of revolutions is stipulated con sidering the stresses occurring in the rotating parts and the working conditions of the centrifuge, such as expected wear, vibration of the decanter as a whole, and so on.
  • the critical number of revolutions depends inter alia on the mass of the rotating parts, and by reducing said mass the critical number of revolutions may be increased.
  • the decanter centrifuge according to the invention is characterized in that the reduction gear is rotatably journalled in separate bearings, in that its housing is connected with the bowl through a flexural but torsionally stiff coupling, and in that the driven shaft of the reduction gear and the conveyor are likewise connected through a flexural but torsionally stiff coupling.
  • a decanter In use, a decanter is frequently subjected to a substantial wear, particularly of the conveyor. Such wear may change the equilibrium of the decanter to such a degree that even in normal operation undesired vibrations occur which, moreover, often grow worse due to the presence of the relatively heavy gear. Decanter centrifuges with the gear positioned directly on the bowl are, moreover, sensitive to unbalances in the gear itself. As regards balancing it is therefore also a considerable advantage that the gear is a separate dynamic unit that does not influence the vibration conditions of the bowl.
  • a decanter centrifuge 1 substantially consisting of a horizontal, axially symmetrical bowl 2 including a cylindrical section 3 and a conical section 4 and which is rotatably supported in stationary bearings 5 and 6.
  • the bowl 2 includes an elongated screw conveyor 7 which by means of bearings 12 and 14 is rotatably journalled in relation to the bowl and consists of a central body portion 9 surrounded by a continuous screw flight 11.
  • the suspension to be separated in centrifuge 1 is supplied through an inlet 15 of an inlet tube 16 extending coaxially with the axis of rotation of the centrifuge through a central passage 17 provided in conveyor body 9.
  • the tube 16 ends in a transverse, radial passage 19 opening out into the separating space 20 of the centrifuge. After separation in this space the solids are discharged through radial apertures 21, while the liquid is discharged through one or more outlets, not shown, at the opposite end of the bowl.
  • the relative rotation of the screw conveyor in relation to the bowl is provided by means of a gear 22 - e.g. an epicyclic gear - positioned on a separate shaft 24 rotatably journalled in stationary bearings 25 and 26.
  • the housing and the driven shaft of the gear are via two co-axial flexural but torsionally stiff couplings 28 and 29 connected with the bowl 2 and the screw conveyor 7, respectively.
  • this permits the maximum allowable number of revolutions of the bowl and thus also of the centrifuge to be increased, resulting in a substantially improved separating capability and capacity.
  • This invention relates to a decanter centrifuge comprising a rotatably journalled bowl and a rotatable screw conveyor journalled in the bowl and of the type in which the conveyor is connected with the bowl through a reduction gear provided with a housing corotating with the bowl, a driven shaft connected with the conveyor, and a drive shaft whose number of revolutions determines the relative number of revolutions of the conveyor relative to the bowl.
  • Such decanter centrifuges are used for separating a liquid/solids mixture supplied to the interior of the bowl into a solids phase and one or more liquid phases.
  • the separating effect of the centrifuge and its capacity depend on the number of revolutions and the inner diameter of the bowl and on the length of the separating space in such a manner that an increase of each of said parameters, other things being equal, ' will cause an increase of the separating effect and/or the capacity.
  • the separating effect and the capacity of the centrifuge are, however, restricted by the critical number of revolutions of the rotating system and is further limited in practice in that an allowable maximum number of revolutions which is somewhat lower than the critical number of revolutions is stipulated con sidering the stresses occurring in the rotating parts and the working conditions of the centrifuge, such as expected wear, vibration of the decanter as a whole, and so on.
  • the critical number of revolutions depends inter alia on the mass of the rotating parts, and by reducing said mass the critical number of revolutions may be increased.
  • the decanter centrifuge according to the invention is characterized in that the reduction gear is rotatably journalled in separate bearings, in that its housing is connected with the bowl through a flexural but torsionally stiff coupling, and in that the driven shaft of the reduction gear and the conveyor are likewise connected through a flexural but torsionally stiff coupling.
  • a decanter In use, a decanter is frequently subjected to a substantial wear, particularly of the conveyor. Such wear may change the equilibrium of the decanter to such a degree that even in normal operation undesired vibrations occur which, moreover, often grow worse due to the presence of the relatively heavy gear. Decanter centrifuges with the gear positioned directly on the bowl are, moreover, sensitive to unbalances in the gear itself. As regards balancing it is therefore also a considerable advantage that the gear is a separate dynamic unit that does not influence the vibration conditions of the bowl.
  • a decanter centrifuge 1 substantially consisting of a horizontal, axially symmetrical bowl 2 including a cylindrical section 3 and a conical section 4 and which is rotatably supported in stationary bearings 5 and 6.
  • the bowl 2 includes an elongated screw conveyor 7 which by means of bearings 12 and 14 is rotatably journalled in relation to the bowl and consists of a central body portion 9 surrounded by a continuous screw flight 11.
  • the suspension to be separated in centrifuge 1 is supplied through, an inlet 15 of an inlet tube 16 extending coaxially with the axis of rotation of the centrifuge through a central passage 17 provided in conveyor body 9.
  • the tube 16 ends in a transverse, radial passage 19 opening out into the separating space 20 of the centrifuge. After separation in this space the solids are discharged through radial apertures 21, while the liquid is discharged through one or more outlets, not shown, at the opposite end of the bowl.
  • the relative rotation of the screw conveyor in relation to the bowl is provided by means of a gear 22 - e.g. an epicyclic gear - positioned on a separate shaft 24 rotatably journalled in stationary bearings 25 and 26.
  • the housing and the driven shaft of the gear are via two co-axial flexural but torsionally stiff couplings 28 and 29 connected with the bowl 2 and the screw conveyor 7, respectively.
  • this permits the maximum allowable number of revolutions of the bowl and thus also of the centrifuge to be increased, resulting in a substantially improved separating capability and capacity.
  • PCT/DK89/00151 (1) International Application Number : PCT/DK89/00151 (81) Designated States: AT (European patent), BE (Eur patent), CH (European patent), DE (European pa
  • the decanter centrifuge (1) comprises a bowl (2) and a conveyor screw (7) rotatably journalled in the bowl (2) and a re tion gear (22) providing a relative rotation of the screw relative to the bowl.
  • the gear (22) is journalled separately relative to bowl in separate bearings (25, 26).
  • the housing and the driven shaft of the gear (22) are by means of flexural but torsionally s couplings (28, 29) connected with the bowl (2) and the conveyor (7), resp. Said flexural couplings result in that the gear (22) is namically insulated from the bowl (2) and does not influence the critical number of revolutions thereof.
  • This invention relates to a decanter centrifuge comprising a rotatably journalled bowl and a rotatable screw conveyor journalled in the bowl and of the type in which the conveyor is connected with the bowl through a reduction gear provided with a housing corotating with the bowl, a driven shaft connected with the conveyor, and a drive shaft whose number of revolutions determines the relative number of revolutions of the conveyor relative to the bowl.
  • Such decanter centrifuges are used for separating a liquid/solids mixture supplied to the interior of the bowl into a solids phase and one or more liquid phases.
  • the separating effect of the centrifuge and its capacity depend on the number of revolutions and the inner diameter of the bowl and on the length of the separating space in such a manner that an increase of each of said parameters, other things being equal, will, cause an increase of the separating effect and/or the capacity.
  • the separating effect and the capacity of the centrifuge are, however, restricted by the critical number of revolutions of the rotating system and is further limited in practice in that an allowable maximum number of revolutions which is somewhat lower than the critical number of revolutions is stipulated con sidering the stresses occurring in the rotating parts and the working conditions of the centrifuge, such as expected wear, vibration of the decanter as a whole, and so on.
  • the critical number of revolutions depends inter alia on the mass of the rotating parts, and by reducing said mass the critical number of revolutions may be increased.
  • the decanter centrifuge according to the invention is characterized in that the reduction gear is rotatably journalled in separate bearings, in that its housing is connected with the bowl through a flexural but torsionally stiff coupling, and in that the driven shaft of the reduction gear and the conveyor are likewise connected through a flexural but torsionally stiff coupling.
  • a decanter In use, a decanter is frequently subjected to a substantial wear, particularly of the conveyor. Such wear may change the equilibrium of the decanter to such a degree that even in normal operation undesired vibrations occur which, moreover, often grow worse due to the presence of the relatively heavy gear. Decanter centrifuges with the gear positioned directly on the bowl are,, moreover, sensitive to unbalances in the gear itself. As regards balancing it is therefore also a considerable advantage that the gear is a separate dynamic unit that does not influence the vibration conditions of the bowl.
  • a decanter centrifuge 1 substantially consisting of a horizontal, axially symmetrical bowl 2 including a cylindrical section 3 and a conical section 4 and which is rotatably supported in stationary bearings 5 and 6.
  • the bowl 2 includes an elongated screw conveyor 7 which by means of bearings 12 and 14 is rotatably journalled in relation to the bowl and consists of a central body portion 9 surrounded by a continuous screw flight 11.
  • the suspension to be separated in centrifuge 1 is supplied through an inlet 15 of an inlet tube 16 extending coaxially with the axis of rotation of the centrifuge through a central passage 17 provided in conveyor body 9.
  • the tube 16 ends in a transverse, radial passage 19 opening out into the separating space 20 of the centrifuge. After separation in this space the solids are discharged through radial apertures 21, while the liquid is discharged through one or more outlets, not shown, at the opposite end of the bowl.
  • the relative rotation of the screw conveyor in relation to the bowl is provided by means of a gear 22 - e.g. an epicyclic gear - positioned on a separate shaft 24 rotatably journalled in stationary bearings 25 and 26.
  • the housing and the driven shaft of the gear are via two co-axial flexural but torsionally stiff couplings 28 and 29 connected with the bowl 2 and the screw conveyor 7, respectively.
  • this permits the maximum allowable number of revolutions of the bowl and thus also of the centrifuge to be increased, resulting in a substantially improved separating capability and capacity.

Landscapes

  • Centrifugal Separators (AREA)
PCT/DK1989/000151 1988-06-21 1989-06-19 A decanter centrifuge WO1989012506A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1989604197 DE68904197T2 (de) 1988-06-21 1989-06-19 Dekantierzentrifuge.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK3384/88 1988-06-21
DK338488A DK166996B1 (da) 1988-06-21 1988-06-21 Dekantercentrifuge

Publications (1)

Publication Number Publication Date
WO1989012506A1 true WO1989012506A1 (en) 1989-12-28

Family

ID=8122268

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1989/000151 WO1989012506A1 (en) 1988-06-21 1989-06-19 A decanter centrifuge

Country Status (5)

Country Link
US (1) US5197939A (da)
EP (1) EP0420918B1 (da)
JP (1) JP3009415B2 (da)
DK (1) DK166996B1 (da)
WO (1) WO1989012506A1 (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387175A (en) * 1989-12-29 1995-02-07 Alfa Laval Separation A/S Decanter centrifuge with improved conveyer bearing support
EP0711608A1 (en) * 1994-11-10 1996-05-15 Nkk Corporation Screw decanter centrifuge
WO2012034722A3 (de) * 2010-09-13 2012-05-18 Hiller Gmbh Antriebsvorrichtung in einer schneckenzentrifuge

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE38494E1 (en) 1998-07-13 2004-04-13 Phase Inc. Method of construction for density screening outer transport walls
US6312610B1 (en) 1998-07-13 2001-11-06 Phase Inc. Density screening outer wall transport method for fluid separation devices
US6755969B2 (en) 2001-04-25 2004-06-29 Phase Inc. Centrifuge
US6500107B2 (en) 2001-06-05 2002-12-31 Baxter International, Inc. Method for the concentration of fluid-borne pathogens
US6805805B2 (en) * 2001-08-13 2004-10-19 Phase Inc. System and method for receptacle wall vibration in a centrifuge
US6706180B2 (en) * 2001-08-13 2004-03-16 Phase Inc. System for vibration in a centrifuge
US7320750B2 (en) * 2003-03-11 2008-01-22 Phase Inc. Centrifuge with controlled discharge of dense material
US6971525B2 (en) * 2003-06-25 2005-12-06 Phase Inc. Centrifuge with combinations of multiple features
US7371322B2 (en) * 2003-07-30 2008-05-13 Phase Inc. Filtration system and dynamic fluid separation method
US7294274B2 (en) * 2003-07-30 2007-11-13 Phase Inc. Filtration system with enhanced cleaning and dynamic fluid separation
US7282147B2 (en) * 2003-10-07 2007-10-16 Phase Inc. Cleaning hollow core membrane fibers using vibration
CN101247893B (zh) * 2005-08-26 2010-12-08 巴工业株式会社 滗析器型离心分离机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2070485A5 (en) * 1969-12-05 1971-09-10 Defontenay Paul Control system for centrifuge - to produce differential rotation
US3685722A (en) * 1969-05-22 1972-08-22 Bird Machine Co Solids-liquid separating centrifuge
US4069967A (en) * 1976-10-14 1978-01-24 Bird Machine Company, Inc. Centrifuge with chatter suppression
US4303192A (en) * 1979-07-05 1981-12-01 Hide Katsume Full jacket-worm centrifuge
US4327862A (en) * 1978-11-15 1982-05-04 Klockner-Humboldt-Deutz Ag Worm centrifuge
EP0107470A2 (en) * 1982-10-21 1984-05-02 Alfa-Laval Separation A/S A decanter centrifuge
WO1987006856A1 (en) * 1986-05-06 1987-11-19 Alfa-Laval Separation A/S Decanter centrifuge

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1188113A (en) * 1916-02-19 1916-06-20 Millward Tremain Thomas Flexible shaft-coupling.
US2614748A (en) * 1947-07-29 1952-10-21 Howard P Ritsch Centrifuge for separating solids
US2715822A (en) * 1952-01-08 1955-08-23 Preco Inc Drive coupling and assembly
DE1049787B (de) * 1957-02-20 1959-01-29 Aachen Dr.-Ing. Konrad Beyerle Dämpflager für die Wellen einer Gaszentrifuge
US3187997A (en) * 1962-02-12 1965-06-08 Ametek Inc Horizontal type centrifugal separator
US3428246A (en) * 1967-12-21 1969-02-18 Pennsalt Chemicals Corp Centrifuge apparatus
US3734399A (en) * 1971-05-28 1973-05-22 Beloit Corp Differential scroll drive
US3779451A (en) * 1971-11-22 1973-12-18 Int Equipment Co Flexible shaft stabilizer
US3938354A (en) * 1971-11-22 1976-02-17 Damon Corporation Apparatus for transmitting rotational energy from a motor to the rotor of a centrifuge
US4141488A (en) * 1977-08-18 1979-02-27 Koninklijke Nederlandse Papierfabrieken N.W. Centrifuge
US4190194A (en) * 1978-07-28 1980-02-26 Bird Machine Company, Inc. Solids liquid separating centrifuge with solids classification
US4186096A (en) * 1978-10-30 1980-01-29 Reclamet, Inc. Shiftable bottom wall for separator bowl and blade construction therefor
JPS55149437A (en) * 1979-05-10 1980-11-20 Ciba Geigy Ag Transmission shaft
AU538688B2 (en) * 1979-10-20 1984-08-23 Klockner-Humboldt-Deutz Aktiengesellschaft Discharge control device for centrifuge
FR2477247A1 (fr) * 1980-02-28 1981-09-04 Nadella Accouplement elastique muni d'une securite d'entrainement
US4391594A (en) * 1980-08-25 1983-07-05 Lord Corporation Flexible coupling
CS238202B1 (en) * 1982-05-31 1985-11-13 Zdenek Rajsigl High-speed rotor resilient mounting
DE3239075A1 (de) * 1982-10-22 1984-05-03 Uni-Cardan Ag, 5200 Siegburg Gelenkwelle, insbesondere zum antrieb der raeder eines kraftfahrzeuges
US4861313A (en) * 1987-07-09 1989-08-29 Sundstrand Corporation Elastomeric shaft coupling for concentric shafts

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3685722A (en) * 1969-05-22 1972-08-22 Bird Machine Co Solids-liquid separating centrifuge
FR2070485A5 (en) * 1969-12-05 1971-09-10 Defontenay Paul Control system for centrifuge - to produce differential rotation
US4069967A (en) * 1976-10-14 1978-01-24 Bird Machine Company, Inc. Centrifuge with chatter suppression
US4327862A (en) * 1978-11-15 1982-05-04 Klockner-Humboldt-Deutz Ag Worm centrifuge
US4303192A (en) * 1979-07-05 1981-12-01 Hide Katsume Full jacket-worm centrifuge
EP0107470A2 (en) * 1982-10-21 1984-05-02 Alfa-Laval Separation A/S A decanter centrifuge
WO1987006856A1 (en) * 1986-05-06 1987-11-19 Alfa-Laval Separation A/S Decanter centrifuge

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5387175A (en) * 1989-12-29 1995-02-07 Alfa Laval Separation A/S Decanter centrifuge with improved conveyer bearing support
EP0711608A1 (en) * 1994-11-10 1996-05-15 Nkk Corporation Screw decanter centrifuge
US5681256A (en) * 1994-11-10 1997-10-28 Nkk Corporation Screw decanter centrifuge having a speed-torque controller
WO2012034722A3 (de) * 2010-09-13 2012-05-18 Hiller Gmbh Antriebsvorrichtung in einer schneckenzentrifuge
CN103221140A (zh) * 2010-09-13 2013-07-24 希勒有限责任公司 螺旋运输离心式分离器中的驱动装置
US8808154B2 (en) 2010-09-13 2014-08-19 Hiller Gmbh Drive apparatus in a scroll centrifuge having a gearbox with a housing nonrotatably connected to a drive shaft

Also Published As

Publication number Publication date
JP3009415B2 (ja) 2000-02-14
EP0420918A1 (en) 1991-04-10
EP0420918B1 (en) 1992-12-30
DK338488D0 (da) 1988-06-21
DK338488A (da) 1989-12-22
DK166996C (da) 1993-08-16
DK166996B1 (da) 1993-08-16
JPH03505698A (ja) 1991-12-12
US5197939A (en) 1993-03-30

Similar Documents

Publication Publication Date Title
WO1989012506A1 (en) A decanter centrifuge
US8444541B2 (en) Solid-bowl centrifuge having a liquid discharge sealed such that a pond level in a separation space remains unchanged when pressurization occurs
US9561513B2 (en) Method for discharging a heavier liquid phase by adjusting a discharge radius based on a viscosity of the heavier liquid phase
AU2006257485A1 (en) Three-phase solid bowl screw centrifuge and method of controlling the separating process
AU2004265085B2 (en) Solid bowl screw centrifuge comprising a scraping blade
CN113164979A (zh) 离心分离器
US4202773A (en) Apparatus for the dewatering of sludge
CN103153474B (zh) 用于借助离心分离机对产品进行相分离的方法
GB2064997A (en) Screen bowl decanter centrifuges
US5800332A (en) Decanting centrifuge employing elements with differing rates of rotation
US4129249A (en) Centrifuge for separating solids and liquids
EP2262588A1 (en) Screen bowl centrifuge
EP0270579A1 (en) DECANTER CENTRIFUGE.
US3924804A (en) Centrifuge for the separation of mixtures of liquids
US20060089247A1 (en) Solid bowl helical conveyor centrifuge comprising an adjustable outlet for solids
US20220143625A1 (en) Integrated decanter and centrifuge separator for three-phase separation
CA1063991A (en) Centrifuge with chatter suppression
CN106163668B (zh) 沉降式离心机
US4085887A (en) Centrifuge for draining off sewage sludge
GB2083381A (en) Uniflow decanter centrifuge
EP0127065B1 (en) A comminuting machine, especially for emulsifying or fine comminuting of meat products
JP2980676B2 (ja) 遠心傾瀉装置
JPH11207211A (ja) スクリューデカンタ型遠心分離機
US3700704A (en) Triglyceride refining
SU1009515A2 (ru) Центробежное устройство дл фильтровани суспензий

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LU NL SE

COP Corrected version of pamphlet

Free format text: PAGE 1/1,DRAWING,ADDED

WWE Wipo information: entry into national phase

Ref document number: 1989907684

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1989907684

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1989907684

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1989907684

Country of ref document: EP