EP0120953A1 - Coal-water dispersion - Google Patents
Coal-water dispersionInfo
- Publication number
- EP0120953A1 EP0120953A1 EP83903623A EP83903623A EP0120953A1 EP 0120953 A1 EP0120953 A1 EP 0120953A1 EP 83903623 A EP83903623 A EP 83903623A EP 83903623 A EP83903623 A EP 83903623A EP 0120953 A1 EP0120953 A1 EP 0120953A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dispersion
- coal
- additives
- anionic
- water
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 239000006185 dispersion Substances 0.000 title claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 43
- 239000000654 additive Substances 0.000 claims abstract description 10
- 125000000129 anionic group Chemical group 0.000 claims abstract description 9
- 125000003118 aryl group Chemical group 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229920001477 hydrophilic polymer Polymers 0.000 claims abstract description 5
- 229920001400 block copolymer Polymers 0.000 claims abstract description 3
- 239000003921 oil Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 230000002209 hydrophobic effect Effects 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 claims 1
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims 1
- 125000001931 aliphatic group Chemical group 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 claims 1
- 239000000446 fuel Substances 0.000 abstract description 13
- 239000007788 liquid Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 229920000642 polymer Polymers 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 11
- 239000002245 particle Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000006641 stabilisation Effects 0.000 description 6
- 238000011105 stabilization Methods 0.000 description 6
- 238000005188 flotation Methods 0.000 description 5
- 238000001879 gelation Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000004094 surface-active agent Substances 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- -1 aliphatic alcohols Chemical class 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000002888 zwitterionic surfactant Substances 0.000 description 3
- IIZPXYDJLKNOIY-JXPKJXOSSA-N 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCC\C=C/C\C=C/C\C=C/C\C=C/CCCCC IIZPXYDJLKNOIY-JXPKJXOSSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 229920000578 graft copolymer Polymers 0.000 description 2
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical compound CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 235000010445 lecithin Nutrition 0.000 description 2
- 239000000787 lecithin Substances 0.000 description 2
- 229940067606 lecithin Drugs 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000003784 tall oil Substances 0.000 description 2
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 2
- FHVDTGUDJYJELY-UHFFFAOYSA-N 6-{[2-carboxy-4,5-dihydroxy-6-(phosphanyloxy)oxan-3-yl]oxy}-4,5-dihydroxy-3-phosphanyloxane-2-carboxylic acid Chemical compound O1C(C(O)=O)C(P)C(O)C(O)C1OC1C(C(O)=O)OC(OP)C(O)C1O FHVDTGUDJYJELY-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229920002907 Guar gum Polymers 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- RVGRUAULSDPKGF-UHFFFAOYSA-N Poloxamer Chemical class C1CO1.CC1CO1 RVGRUAULSDPKGF-UHFFFAOYSA-N 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 229940072056 alginate Drugs 0.000 description 1
- 235000010443 alginic acid Nutrition 0.000 description 1
- 229920000615 alginic acid Polymers 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 235000010417 guar gum Nutrition 0.000 description 1
- 239000000665 guar gum Substances 0.000 description 1
- 229960002154 guar gum Drugs 0.000 description 1
- 229920000591 gum Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000008040 ionic compounds Chemical class 0.000 description 1
- 229920000831 ionic polymer Polymers 0.000 description 1
- 239000012263 liquid product Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 239000006259 organic additive Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011020 pilot scale process Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/324—Dispersions containing coal, oil and water
Definitions
- the present invention relates to a liquid fuel comprising pulverized coal dispersed in a liquid, which has a ve ry long storage life and is suitable for transport and energy production. More particularly, the invention relates to a dispersion comprising a liquid which at least partially consists of water, pulverized coal and additives, the coal content being at least 60 % by weight.
- a dispersion of coal is considerably less polluting and can be more easily handled than solid coal and also eliminates some risks involved in transport and storage. Such a dispersion is also preferred from an economical point of view.
- Physical conversion is another method of transforming the coal into liquid form, and the invention relates to this method. It is practised by dispersion in a liquid which may consist of water only or water in combination with some organic fuel such as heating oil, methanol, etc.
- the present invention principally relates to a dispersion of pulverized coal in water.
- One of the problems in producing a coal-water fuel is that the surface structure of the coal is modified in removing impurities, often by means of chemical additives, and that the dispersion of the coal particles in a later processing stage will be more difficult as a consequence thereof.
- the process of manufacturing a coal-water fuel often includes removal of inorganic constituents in one way or the other.
- the coal is ground in one or more mills to a polydisperse particle size distribution. All particles are smaller than about 300 microns and about 35 % of the total amount are smaller than 40 microns.
- a main process step included therein is a flotation enrichment of the coal, which by selective hydrophobization and charging separates coal and contaminants.
- different types of reagents are used which generally comprise mixtures of aliphatic alcohols together with a frothing agent.
- Other reagents which are suitable in the flotation of coal are mixtures of zwitterionic surfactants and oils insoluble in water together with a frothing agent and trace amounts of al kylsulpho-succinates.
- surfactants of the first main type anionic surfactants have shown to be the most suitable.
- surfactants which can be used are al kylaryl-sulphonates and alkylsulpho-succinates.
- dispersion agent In the final processing stage in manufacturing the coal-water fuel a dispersion agent and possibly a stabilizer are added.
- dispersion agents already known for pulverized coal in water or oil are e.g. anionic polynaphtalen sulphonates, polycarboxylic acids and non-ionic ethylene oxide derivatives.
- the total amount of dispersion agent calculated as a weight percentage of the total dispersion is completely decisive for the physical properties of the dispersion.
- the dispersion agent is one of the significant items of expenditure in the manufacture of the dispersion.
- amphifilic non-ionic and slightly anionic graft and block copolymers added to aromatic compounds having at least two aromatic groups have a heavily increased dispersion effect (2a).
- the effect increases as the aromatic content of the hydrophobic part increases to an upper limit at mole weights about 2,000 of the aromatic fraction.
- Ethoxylated and propoxylated naphta are particularly effective from a technical and economical point of view as dispersion agents.
- the mole weight of the dispersion agent can vary within a wide range (2,000 - 15,000) but technically and economically is optimal at about 5,000.
- double the amount of dispersion agent for equivalent rheological properties of the dispersion is required.
- slightly ionic compounds can be used, e.g. between a slightly anionic aromatic compound or another compound with high affinity to the coal surface and one or more slightly anionic or non-ionic polymer chains with high solubility in the water phase (2b).
- This type of compounds also has excellent dispersion properties for coal particles with zwitterionic surfactants or other hydrophobi zing substances already adsorbed on the coal surface.
- Particularly favourable compounds which can be used, having high affinity to the coal surface are e.g. aromatic residues of tall-oil distillation.
- Particularly favourable compounds having low affinity to the coal surface and high solubility in the water phase are polyalcohols, polyamides, certain polyacrylates and polyethylene oxide derivatives.
- the hydrophilic chains possibly also can be sulphated to obtain a negative charge. In this way, more significant hydrophilic properties of the copolymer are obtained.
- the mole weight of the dispersion agent can vary between 1,500 and 20,000.
- the emulsion (0.03 % by weight of the coal) is supplied to the grinding step of the fuel preparation process.
- a preparation consisting of lecithin, hexadecane and methyl isobutyl ketpne is added in the ratio 1/5/2.
- the total additive amount and the composition can be varied for different coal qualities (0.01 - 0.05 % by weight of the coal).
- al kylsulpho-succinate 10 - 50 g/ton coal
- the filter cake contains between 15 and 22 % moisture. 2a/ Totally, 90 grammes of the moist purified coal product (22.2 % ) is homogenized and mixed with 0.25 grammes dispersion agent based on ethoxy lated and propoxylated naphta (mole weight 5,500) dissolved in water (2.5 % sol.).
- the resulting coal content of the dispersion is chosen to be 70 % by adjusting the concentration of the dispersion agent in the water solution.
- the resulting dispersion has very good rheological properties and is well suited for direct transport in pipelines.
- the dewatered purified coal product is supplied to a mixer step wherein a dispersing agent dissolved in water is added.
- the dispersion agent comprises 0.5 % by weight of the dispersion and comprises a slightly anionic graft copolymer based on an ethoxylated residue of a tall-oil distillation.
- the mole weight of the dispersion agent can be varied between 1,500 and 20,000 but preferably is about 3,000.
- a fuel product having a low viscosity ( ⁇ 1,000 cP Br) is obtained containing more than 65 % solid substance, ready for delivery to consumers.
- a gelation agent can be added to the dispersion.
- the gelation can be reversible as well as irreversible.
- Reversible gelation can be attained with small amounts of polysaccharide, xantan gum, guar-gum, alginate or a modified starch in combination with a metal ion, e.g. aluminium or boron.
- the reversible gelation process can be controlled by changing the temperature or the pH.
- Irreversible gelation of the coal-water dispersion can be effected e.g. by means of different clays, bentonite, Chinese clay, etc.
- the fuel product obtained has now a clearly pseudopl astic rheology.
- the coal-water fuel has been found to be a very good oil substitute for heat as well as steam production.
- the fuel is purified from a lot of inorganic contaminants and is preferred from an environmental and handling point of view to conventional coal technology.
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Liquid Carbonaceous Fuels (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
Combustible liquide à base de charbon pulvérisé, d'eau et d'additifs, la teneur en charbon étant au moins égale à 55 %. Ce combustible est indiqué pour le transport dans des pipelines ou pour la combustion directe. On obtient un effet de dispersion fortement accru par rapport aux additifs de l'art antérieur par addition chimique ou liaison de plusieurs cycles aromatiques à une chaîne de polymères hydrophiles. La chaîne de polymères comprend de préférence un copolymérisat bloc à greffe anionique ou non-ionique.Liquid fuel based on pulverized coal, water and additives, the carbon content being at least 55%. This fuel is suitable for transport in pipelines or for direct combustion. A greatly increased dispersion effect is obtained compared to additives of the prior art by chemical addition or bonding of several aromatic rings to a chain of hydrophilic polymers. The polymer chain preferably comprises an anionic or non-ionic graft block copolymer.
Description
Claims
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1982/000244 WO1983003617A1 (en) | 1982-04-05 | 1982-11-12 | Coal-water dispersion and method of the manufacture thereof |
WOPCT/EP82/00244 | 1982-11-12 | ||
PCT/SE1983/000039 WO1983003618A1 (en) | 1982-04-05 | 1983-02-04 | Coal-water dispersion and method of the manufacture thereof |
WOPCT/SE83/00039 | 1983-02-04 | ||
SE8302149 | 1983-04-18 | ||
SE8302149A SE8302149L (en) | 1983-05-04 | 1983-04-18 | KOLVATTENDISPERSION |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0120953A1 true EP0120953A1 (en) | 1984-10-10 |
Family
ID=26069305
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP83903623A Withdrawn EP0120953A1 (en) | 1982-11-12 | 1983-11-14 | Coal-water dispersion |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0120953A1 (en) |
KR (1) | KR840008681A (en) |
AU (2) | AU9059782A (en) |
ES (1) | ES8501793A1 (en) |
SE (1) | SE451198B (en) |
WO (1) | WO1984001958A1 (en) |
ZA (2) | ZA84859B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3621319A1 (en) * | 1986-06-26 | 1988-01-14 | Bayer Ag | Coal/water slurries having improved behaviour under shear stress |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4358293A (en) * | 1981-01-29 | 1982-11-09 | Gulf & Western Manufacturing Co. | Coal-aqueous mixtures |
SE436891B (en) * | 1981-09-22 | 1985-01-28 | Carbogel Ab | COMPOSITION INCLUDING FINE DISTRIBUTED COAL, WATER AND AT LEAST ONE POLYELECTROLYT |
-
1982
- 1982-11-12 AU AU90597/82A patent/AU9059782A/en not_active Abandoned
-
1983
- 1983-06-14 SE SE8303364A patent/SE451198B/en not_active IP Right Cessation
- 1983-11-14 AU AU22622/83A patent/AU2262283A/en not_active Abandoned
- 1983-11-14 EP EP83903623A patent/EP0120953A1/en not_active Withdrawn
- 1983-11-14 WO PCT/SE1983/000397 patent/WO1984001958A1/en unknown
-
1984
- 1984-02-03 ES ES529456A patent/ES8501793A1/en not_active Expired
- 1984-02-06 ZA ZA84859A patent/ZA84859B/en unknown
- 1984-02-06 ZA ZA84860A patent/ZA84860B/en unknown
- 1984-04-17 KR KR1019840002016A patent/KR840008681A/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO8401958A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3621319A1 (en) * | 1986-06-26 | 1988-01-14 | Bayer Ag | Coal/water slurries having improved behaviour under shear stress |
Also Published As
Publication number | Publication date |
---|---|
ES529456A0 (en) | 1984-12-01 |
ES8501793A1 (en) | 1984-12-01 |
SE8303364L (en) | 1984-05-13 |
WO1984001958A1 (en) | 1984-05-24 |
SE8303364D0 (en) | 1983-06-14 |
ZA84859B (en) | 1985-02-27 |
SE451198B (en) | 1987-09-14 |
ZA84860B (en) | 1984-12-24 |
AU9059782A (en) | 1983-11-04 |
KR840008681A (en) | 1984-12-17 |
AU2262283A (en) | 1984-06-04 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB LI LU NL SE |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19850213 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: STIGSSON, LARS, LENNART |