WO1999061373A1 - Produit d'extrusion a base de chaux hydratee - Google Patents
Produit d'extrusion a base de chaux hydratee Download PDFInfo
- Publication number
- WO1999061373A1 WO1999061373A1 PCT/BE1999/000063 BE9900063W WO9961373A1 WO 1999061373 A1 WO1999061373 A1 WO 1999061373A1 BE 9900063 W BE9900063 W BE 9900063W WO 9961373 A1 WO9961373 A1 WO 9961373A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- extrusion product
- hydrated lime
- extrusion
- product according
- mixture
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/02—Oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
- B01D53/685—Halogens or halogen compounds by treating the gases with solids
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
Definitions
- the present invention relates to an extrusion product containing hydrated lime.
- Such products are already known which are obtained by extrusion of a slaked lime paste with an organic compound, such as an alcohol, of the methyl alcohol type, or an alcoholic fermentation solution or also a ligninsulfonate solution.
- the extrudates obtained are then dried in air or in a dryer to allow the organic compound to evaporate, then they are optionally sorted (see the abstract of JP-A-60081021 from Derwent, access no. 85-149035, and the abstract of JP-A-59152219 from Derwent, access no. 84-252992).
- These products, intended for soil improvement in agriculture are intended to disintegrate in the presence of moisture and thus to disperse in the best possible way in the soils to be treated. They therefore do not have significant structural mechanical strength and their resistance to water is as low as possible.
- Dumplings agglomerated from lignite ash and calcium hydroxide have already been provided for the same purpose (EP-A-0307928).
- these products are intended to be introduced directly into the combustion chamber, mainly for the desulfurization of sulfur fuels.
- According to a technique, called dry cleaning it has already been proposed to treat gases containing acids with the aid of calcium hydroxide agglomerated in grains of any shape.
- the combustion gases are passed through a fixed or fluidized bed of these grains (BE-A-1000726). This treatment requires gas to pass through the bed of calcium hydroxide grains at a high temperature, in particular between 150 and 350 ° C.
- the object of the present invention is to solve the problems posed by the purification of gases, in particular waste gases, while avoiding those posed by the use of lime powders or lime agglomerates hitherto used.
- the invention provides to solve these problems an extrusion product containing hydrated lime, which is in the form of a calcined extrudate which contains at least one binder capable of withstanding a calcination temperature of the extrusion product.
- calcined extruded is meant according to the invention a product which, after extrusion, has reached a calcination temperature.
- calcination temperature it is necessary to understand a temperature higher than a simple drying temperature, the latter corresponding to that where the humidity of the product is eliminated.
- at the calcination temperature at least one chemical component contained in the starting material is broken down, for example a plasticizer which was intended to facilitate extrusion, and the calcined extrudate according to the invention therefore does not contain plus this component.
- Such an extruded offers the advantage of forming, in the calcined state, a product where the lime and the binder together form a structure mechanically robust, porous which, on the one hand, will resist crushing and attrition and which, on the other hand, will not decompose in the presence of water.
- the use of absorbent in the form of extrudates also allows total exhaustion of the absorbent before its replacement.
- the calcined extrusion product contains at least 50% by weight, preferably at least 80%, advantageously 85% or even 90%, and more, hydrated lime. The lime content of the product is then optimal, while retaining an excellent lime reactivity and a long service life of the absorbent product.
- the invention is in the form of cylinders with a length equal to 1 to 6 times their diameter, preferably 2 to 4 times, and the cylinders have a base diameter of in the range of 1 mm to 30 mm.
- This shaping allows a fixed or mobile bed an excellent yield by gas flow to be purified.
- the product in a gaseous medium, has a rate of capture in SO 2 , in HCI and in HF close to that of hydrated lime, in the powder state, under conditions identical in implementation. So while solving the problems posed by the powders, the power purification of the powder forming the extruded product is not or almost not altered in the extruded, calcined product.
- the invention also relates to a process for preparing an extrusion product according to the invention.
- a preparation process comprising a dry mixture of hydrated lime, said binder and a plasticizing agent, a progressive incorporation of water in this mixture so as to obtain an extrudable paste, an extrusion of this paste in said extruded product, drying and calcination of the dried extruded product at a calcination temperature above the degradation temperature of the plasticizing agent and below the decomposition temperature of hydrated lime.
- a plasticizing agent which facilitates the extrusion of the mixture formed, while allowing disappearance of any trace of this agent, as indeed any trace of water, in the product. final.
- the calcination temperature may advantageously be of the order of 150 to 350 ° C, preferably from 200 to 300 ° C, in particular about 250 ° C.
- an additive chosen from the group comprising polysaccharides, natural or synthetic cellulose, cellulose derivatives, polyvinylpyrrolidone, a polyethylene or polyvinyl derivative, is used, or a mixture of these materials.
- the method comprises adding to the dry mixture of activated carbon, lignite coke, zeolite or a mixture of these materials.
- the product extrusion then purifies the flue gases with regard to dioxins, furans and other usual impurities in trace amounts.
- the starting hydrated lime itself exhibits exceptional qualities of absorption of SO 2 , HCI and HF, such as those described in particular in WO-A-97/14650.
- the invention also relates to the use of an extrusion product for the treatment of gases and fumes.
- a fixed bed can be provided which is located downstream of the combustion chamber and which contains a predetermined quantity of extrusion product according to the invention.
- Such an arrangement can be provided after normal treatment of the gases with a powder, followed by filtration, the fixed bed serving for the purification of the peaks of SO 2 , HCI or HF presented by the gases to be treated.
- the result is a consumption which is clearly better managed than the consumption of lime powder which can be determined in accordance with the usual average of SO 2 , HCI or HF in the gases to be treated.
- the gases to be purified pass against the current of the bed and regularly the base of the bed is evacuated after exhaustion of its absorbing power. In this case you can do without a powder treatment and an expensive filtering device, since it has to be replaced frequently.
- the hydrated lime mentioned in the examples below is a hydrated lime with a large specific surface (> 40 m / g) and a large total pore volume of nitrogen desorption (> 0.2 cm 3 / g ).
- the extrusion products obtained will be subjected to tests. The conditions of the measurements and tests which will be used are specified below.
- the extrusion product has a crush resistance of at least 0.8 kg / mm. Measuring the attrition resistance 100 g of extruded cylinders are rotated in a cylindrical drum 305 mm in diameter and 260 mm in length; the drum rotates around its axis at a rate of 55 revolutions / min.
- the percentage of fines less than 850 micrometers is determined.
- the attrition resistance is less than
- a boiling water test resistance of at least 85% is provided.
- a pore volume calculated by carbon tetrachloride greater than 0.2 cm 3 / g is provided.
- the specific surface is determined from the nitrogen absorption isotherm (BET multipoint method); the pore volume is calculated by the BJH method during the nitrogen desorption from a relative pressure of 0.95 (pore size dimensions between 20 and + 1000 ⁇ ). These measurements are carried out with Micromeretics ASAP 2010 equipment.
- a pore volume BJH greater than 0.01 cm 3 / g and a specific surface greater than 15 m 2 / g are provided.
- Example 1 13.3 kg of hydrated lime, 0.7 kg of bentonite (Bentonil
- the extruded cylinders are dried for 3 hours at 110 ° C and calcined for 3 hours at 250 ° C.
- a sample weight equivalent to 4.5 g of Ca (OH) 2 is placed in a cylindrical reactor 35 mm in diameter. Then passed through the absorbent bed, for 6 hours, a gas containing 3000 Vpm of SO 2 , with a humidity of 8% and a temperature of 300 ° C. The gas flow rate is 90 l / h so that the quantity of SO 2 which crosses the bed is that stoichiometrically necessary to transform all the calcium hydroxide into calcium sulphate.
- the SO2 concentration at the inlet and the outlet of the reactor is measured by an infrared cell.
- the uptake rate is determined by the following relationship: (A-B) x 100 / A where:
- A the total amount of SO 2 entering during a 6 hour period
- B the total amount of SO 2 leaving during this 6 hour period
- extruded cylinders matured for 24 hours at room temperature, are then dried for 3 hours at 110 ° C and calcined for 3 hours at 250 ° C.
- the extruded cylinders are matured for 72 hours at room temperature and at 80 ° C for 24 hours in a closed container; they are then dried for 3 hours at 110 ° C and calcined for 3 hours at 250 ° C.
- the extruded cylinders are brought to 80 ° C for one hour; they are then dried for 3 hours at 110 ° C and calcined for 3 hours at 250 ° C.
- the SO 2 uptake rate of the extruded cylinders is 50%.
- the capture capacity of the HCI was also measured in the laboratory by proceeding as follows: A sample weight equivalent to 3.4 g of liquid is placed
- the uptake rate is determined by the following relationship:
- A the total amount of HCI entering during a 6 hour period.
- B the total amount of HCI exiting during this 6 hour period.
- This installation consists of a box which has four trays with a diameter of 35 cm on which is placed a layer of absorbent at a rate of five kg per tray for the extruded cylinders and 10 kg per tray for the limestone grains.
- This box is connected to an industrial gas bypass which contains around 800 mg / Nm 3 of SO 2 (oxygen content of 18%).
- the gas temperature is 65 ° C. Gas, at the rate of 18
- the extrusion product is present, not only in a cylindrical form, but also in any extrudable form, for example of hollow cylinder, grooved cylinder, prism with any base, etc.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Treating Waste Gases (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU40249/99A AU4024999A (en) | 1998-05-26 | 1999-05-19 | Extrusion product based on hydrated lime |
CA002333778A CA2333778A1 (fr) | 1998-05-26 | 1999-05-19 | Produit d'extrusion a base de chaux hydratee |
IL13971799A IL139717A0 (en) | 1998-05-26 | 1999-05-19 | Extrusion product based on hydrated lime |
EP99923323A EP1100753A1 (fr) | 1998-05-26 | 1999-05-19 | Produit d'extrusion a base de chaux hydratee |
PL99344484A PL344484A1 (en) | 1998-05-26 | 1999-05-19 | Extrusion product based on hydrated lime |
BR9910700-7A BR9910700A (pt) | 1998-05-26 | 1999-05-19 | Produto de extrusão à base de cal hidratada |
JP2000550787A JP2002516247A (ja) | 1998-05-26 | 1999-05-19 | 消石灰にもとづく押出し生成物 |
NO20005956A NO20005956D0 (no) | 1998-05-26 | 2000-11-24 | Ekstruderingsprodukt basert på lesket kalk |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE9800401 | 1998-05-26 | ||
BE9800401A BE1011935A3 (fr) | 1998-05-26 | 1998-05-26 | Produit d'extrusion a base de chaux hydratee. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999061373A1 true WO1999061373A1 (fr) | 1999-12-02 |
Family
ID=3891269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BE1999/000063 WO1999061373A1 (fr) | 1998-05-26 | 1999-05-19 | Produit d'extrusion a base de chaux hydratee |
Country Status (13)
Country | Link |
---|---|
EP (1) | EP1100753A1 (fr) |
JP (1) | JP2002516247A (fr) |
CN (1) | CN1307541A (fr) |
AU (1) | AU4024999A (fr) |
BE (1) | BE1011935A3 (fr) |
BR (1) | BR9910700A (fr) |
CA (1) | CA2333778A1 (fr) |
ID (1) | ID27297A (fr) |
IL (1) | IL139717A0 (fr) |
NO (1) | NO20005956D0 (fr) |
PL (1) | PL344484A1 (fr) |
TR (1) | TR200003476T2 (fr) |
WO (1) | WO1999061373A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004022641A2 (fr) | 2002-09-09 | 2004-03-18 | W.R. Grace & Co.-Conn | Absorbant d'hydroxyde de calcium a modificateur rheologique et procede impliquant un tel absorbant |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007142192A1 (fr) | 2006-06-02 | 2007-12-13 | National University Corporation Tohoku University | Particule poreuse d'oxyde de calcium et particule poreuse d'hydroxyde de calcium |
CN101773768A (zh) * | 2010-03-16 | 2010-07-14 | 长春惠工净化工业有限公司 | 从气体中脱除HCl的干法脱氯剂及其制备方法 |
JP6031645B2 (ja) * | 2012-03-30 | 2016-11-24 | 国立研究開発法人 海上・港湾・航空技術研究所 | 脱硫剤、脱硫方法及び脱硫剤の製造方法 |
CN113499674B (zh) * | 2021-08-27 | 2022-10-14 | 中晶环境科技股份有限公司 | 用于烟气脱硫的吸收剂及其制备方法和组合物的用途 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0134277A1 (fr) * | 1983-08-26 | 1985-03-20 | Hoechst CeramTec Aktiengesellschaft | Procédé et dispositif de fabrication des tubes frittés polycristallins translucides |
JPS61293546A (ja) * | 1985-06-21 | 1986-12-24 | Nippon Chem Ind Co Ltd:The | 酸性ガス除去剤 |
JPS6271534A (ja) * | 1985-09-25 | 1987-04-02 | Nippon Chem Ind Co Ltd:The | 酸性ガス除去剤 |
WO1997014650A1 (fr) * | 1995-10-19 | 1997-04-24 | Lhoist Recherche Et Developpement S.A. | PARTICULES DE Ca(OH)¿2? |
-
1998
- 1998-05-26 BE BE9800401A patent/BE1011935A3/fr not_active IP Right Cessation
-
1999
- 1999-05-19 BR BR9910700-7A patent/BR9910700A/pt not_active Application Discontinuation
- 1999-05-19 IL IL13971799A patent/IL139717A0/xx unknown
- 1999-05-19 WO PCT/BE1999/000063 patent/WO1999061373A1/fr not_active Application Discontinuation
- 1999-05-19 AU AU40249/99A patent/AU4024999A/en not_active Abandoned
- 1999-05-19 PL PL99344484A patent/PL344484A1/xx unknown
- 1999-05-19 CN CN99807896.4A patent/CN1307541A/zh active Pending
- 1999-05-19 ID IDW20002710A patent/ID27297A/id unknown
- 1999-05-19 TR TR2000/03476T patent/TR200003476T2/xx unknown
- 1999-05-19 JP JP2000550787A patent/JP2002516247A/ja active Pending
- 1999-05-19 CA CA002333778A patent/CA2333778A1/fr not_active Abandoned
- 1999-05-19 EP EP99923323A patent/EP1100753A1/fr not_active Withdrawn
-
2000
- 2000-11-24 NO NO20005956A patent/NO20005956D0/no not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0134277A1 (fr) * | 1983-08-26 | 1985-03-20 | Hoechst CeramTec Aktiengesellschaft | Procédé et dispositif de fabrication des tubes frittés polycristallins translucides |
JPS61293546A (ja) * | 1985-06-21 | 1986-12-24 | Nippon Chem Ind Co Ltd:The | 酸性ガス除去剤 |
JPS6271534A (ja) * | 1985-09-25 | 1987-04-02 | Nippon Chem Ind Co Ltd:The | 酸性ガス除去剤 |
WO1997014650A1 (fr) * | 1995-10-19 | 1997-04-24 | Lhoist Recherche Et Developpement S.A. | PARTICULES DE Ca(OH)¿2? |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section Ch Week 8706, Derwent World Patents Index; Class E36, AN 87-039068, XP002090014 * |
DATABASE WPI Section Ch Week 8719, Derwent World Patents Index; Class E36, AN 87-132012, XP002090013 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004022641A2 (fr) | 2002-09-09 | 2004-03-18 | W.R. Grace & Co.-Conn | Absorbant d'hydroxyde de calcium a modificateur rheologique et procede impliquant un tel absorbant |
EP1539345A2 (fr) * | 2002-09-09 | 2005-06-15 | W.R. Grace & Co. | Absorbant d'hydroxyde de calcium a modificateur rheologique et procede impliquant un tel absorbant |
EP1539345A4 (fr) * | 2002-09-09 | 2009-01-28 | Grace W R & Co | Absorbant d'hydroxyde de calcium a modificateur rheologique et procede impliquant un tel absorbant |
Also Published As
Publication number | Publication date |
---|---|
PL344484A1 (en) | 2001-11-05 |
ID27297A (id) | 2001-03-22 |
BE1011935A3 (fr) | 2000-03-07 |
AU4024999A (en) | 1999-12-13 |
JP2002516247A (ja) | 2002-06-04 |
CA2333778A1 (fr) | 1999-12-02 |
NO20005956L (no) | 2000-11-24 |
BR9910700A (pt) | 2001-01-30 |
CN1307541A (zh) | 2001-08-08 |
EP1100753A1 (fr) | 2001-05-23 |
IL139717A0 (en) | 2002-02-10 |
NO20005956D0 (no) | 2000-11-24 |
TR200003476T2 (tr) | 2001-04-20 |
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