EP0160648A1 - Means and procedure for removal of carbon dioxide - Google Patents
Means and procedure for removal of carbon dioxideInfo
- Publication number
- EP0160648A1 EP0160648A1 EP84900134A EP84900134A EP0160648A1 EP 0160648 A1 EP0160648 A1 EP 0160648A1 EP 84900134 A EP84900134 A EP 84900134A EP 84900134 A EP84900134 A EP 84900134A EP 0160648 A1 EP0160648 A1 EP 0160648A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- air
- carbon dioxide
- carbonate
- aluminum oxide
- alkali metal
- 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- Withdrawn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
Classifications
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M12/00—Hybrid cells; Manufacture thereof
- H01M12/04—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type
- H01M12/06—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type with one metallic and one gaseous electrode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- Air contains a little above 300 ppm carbon dioxide.
- the metal air batteries mainly the iron- and zink/air batteries, have a very high energy density but have in spite of this not yet found practical application as batteries for electric cars.
- One reason for this is that the alkaline electrolyte picks up carbon dioxide from the reaction air.
- the electrolyte has to be changed after a small number of cycles.
- One possi- bility to go around this problem is to clean the electrolyte by electro-dialysis in a continuous or discontinuous process.
- the carbon dioxide of the air is, owever, the cause of other problems in this application which cannot be sol- ved by electrolyte change or electrolyte purification. Carbonates are precipitated in channels and air cham ⁇ bers which is connected with the "creeping" property of the alkaline electrolyte. Such a “carbonate beard” can in its turn cause secondary effects with serious battery damage as a consequence.
- the present invention is an efficient and surprisingly simple solution to this problem which meets all require ⁇ ments put up, in particular the requirements on simplicity, reliability and small size.
- the invention can also be used in an analogous manner for elimination of carbon dioxide from air and fuel gas for fuel cell generators with alkaline electro ⁇ lyte. Another related application is elimination of carbon dioxide from reaction air for chlor alkali cells with air cathodes, electro-chemical so-called oxygen generators with air cathodes etc. There are also many applications outside the proper electro-chemical energy technology, e.g. removal of carbon dioxide from the atmosphere aboard submarines, space vehicles etc.
- the invention is concerned with an apparatus and a pro ⁇ cedure for removal of carbon dioxide from gas mixtures characterized in that it comprises a fixed bed absorp ⁇ tion reactor containing one body or a multitude of bodies of a supporting material, the surface of which at least consists of porous aluminum oxide or aluminate impregnated with a carbonate of an alkali metal.
- Figure 1 shows in principal a metal/air battery with an absorption reactor for air purificatio .
- the basic process for the invention is the reaction between sodium carbonate and carbon dioxide at a tem ⁇ perature below - 100 C preferably ⁇ 50 C.
- the sodium carbonate is regenerated by heat treatment at a temperature above 100°C, preferably 150-200°C.
- the carrier material consists of aluminum oxide,Al-O-, > or is a mixture of aluminum oxide or aluminate with other resistant oxides like magnesium oxide, zirconium oxide, heat stabilized silicon dioxide, silicates etc.
- the absorption reactor is designed in the same way as a catalytic reactor e.g. of the type which is used for exhaust gas cleaning in cars i.e. a pellet bed or mono ⁇ lith structure.
- the absorption reactor is dimensioned preferably for one battery cycle. The height should be 0,2 meter or somewhat above.
- Regeneration can take place by means of electrical heat or in connection with the charging procedure. Regene ⁇ ration may also take place by means of exhaust gas heat in case of hybride systems.
- Another application is a fuel cell generator of the alkaline type intended to replace-the mechanically driven alternating current generator for heavy trucks.
- the hydrogen for the fuel cell generator is produced by steam reforming of methanol.
- Absorption reactors according to the in ⁇ vention can be used as well for purification of the fuel gas as for the reaction air.
- the exhaust gas heat from the main engine is used for regeneration of the absorption reactors with a scheme with several parallell reactors in a permutated cycle of operation.
- Figure 1 shows completely schematically an iron/air battery with circulating electrolyte according to the U.S. patent 3,801,376 .
- the battery is air cooled. Cooling air and process air are coming into Suite contact with the electrolyte.
- Figure 1 shows the battery pile (1) which is enclosed in a surrounding electrolyte vessel (2) . The air comes into contact with the air electrodes in an air chamber which is not shown. The air flow in the air chamber is shown by dotted flow arrows (3) .
- the electrolyte is circula ⁇ ting through the electrolyte chamber (4) via over flow (5) to the electrolyte trough (6) in the battery vessel.
- the electrolyte flow is shown with the flow arrows (7) .
- Air is supplied by means of two fans, one is governed by the temperature (8) and the other one (9) by the air demand for the discharge current in question. There is also a heat exchanger- (10) in the air system for recovery of water. Pre-heat of the process air is taking place in the battery vessel since the process air is first supplied to the surrounding vessel whereby the air is heated up in contact with the hot electrolyte whi ⁇ le at the same time the air is taking up moisture.
- the system contains also an electrical heater (11) which is used for heating up the battery during cold whether and for regeneration of the absorption reactor (12) . Regeneration is taking place by means of the heat element (13). Air with a temperature around 150 - 200°C is* flowing up through the absorption reac ⁇ tor and is taking with it evaporated carbon dioxide. The air is taken in through the valve (14) which is opened for the regeneration procedure.
- Figure 2 shows a simple embodiment of such an absorp ⁇ tion reactor which thus consists of a vessel contai ⁇ ning a bed of porous pellets of activated aluminum oxide (15) .
- suitable commercially available carriers of this kind are BASF D10-10 or Kebo 1.1108. Impregnation is taking place with e.g. saturated sodium carbonate solution around 50 C whereafter the pellets are dried in an oven at around 150 C for two hours. Potassium carbonate can also be used but it is not more efficient than the cheaper sodium carbonate. Addition of sodium arsenite, which is a known catalyst for this reaction, does not give a further improvement of the catalytic action of the carrier.
- the vessel is furnished with an inlet and an outlet.
- the electrical element (13) is situated in the bed.
- Figure 3 shows another embodiment with a carrier in the form of a monolith ' structure (16) like those which are used for exhaust gas cleaning or final combustion of stack gases from wood stoves etc.
- the porous carrier of aluminum oxide has been impregnated with a sodium carbonate solution.
- the process is complicated with several steps.
- the reaction is not studied in the literature and it has not been possible to elucidate which step is rate determining.
- the absorption is, however, taking place rapidly and with a high efficiency i a.small reactor volume thanks to a not clarified catalytic action devel ⁇ oped by the carrier.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Electrochemistry (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Gas Separation By Absorption (AREA)
Abstract
Du gaz carbonique se trouvant dans l'air et/ou par exemple dans un gaz combustible pour des piles à combustible à hydrogène/air est absorbé dans des corps poreux (15) ou éléments (16) consistant entièrement ou partiellement d'oxyde d'aluminium ou d'aluminate, dont la surface a été imprégnée avec une solution de carbonate alcalin. Dans ces conditions, le gaz carbonique est absorbé rapidement avec formation de carbonate hydrogéné. Le carbonate est régénéré par des moyens thermiques. Le nouveau procédé est simple et efficace et est particulièrement approprié pour des applications légères telles que l'extraction de gaz carbonique de l'air pour des batteries au métal/air, des piles à combustible etc.Carbon dioxide present in the air and / or for example in a combustible gas for hydrogen / air fuel cells is absorbed in porous bodies (15) or elements (16) consisting entirely or partially of oxide of aluminum or aluminate, the surface of which has been impregnated with an alkaline carbonate solution. Under these conditions, carbon dioxide is absorbed quickly with the formation of hydrogenated carbonate. The carbonate is regenerated by thermal means. The new process is simple and efficient and is particularly suitable for light applications such as extracting carbon dioxide from the air for metal / air batteries, fuel cells etc.
Description
Means and procedure for removal of carbon dioxide.
Air contains a little above 300 ppm carbon dioxide. The metal air batteries, mainly the iron- and zink/air batteries, have a very high energy density but have in spite of this not yet found practical application as batteries for electric cars. One reason for this is that the alkaline electrolyte picks up carbon dioxide from the reaction air. The electrolyte has to be changed after a small number of cycles. One possi- bility to go around this problem is to clean the electrolyte by electro-dialysis in a continuous or discontinuous process.
The carbon dioxide of the air is, owever, the cause of other problems in this application which cannot be sol- ved by electrolyte change or electrolyte purification. Carbonates are precipitated in channels and air cham¬ bers which is connected with the "creeping" property of the alkaline electrolyte. Such a "carbonate beard" can in its turn cause secondary effects with serious battery damage as a consequence.
The best principle to solve this carbonate problem is therefore to remove the carbon dioxide from the air before introduction into the metal air battery. There are many known processes in the process industry for absorption of carbon dioxide. None of these known processes is however suitable for the metal/air batteries because of too great complicity and large volume and weight requirements.
The present invention is an efficient and surprisingly simple solution to this problem which meets all require¬ ments put up, in particular the requirements on simplicity, reliability and small size.
OMPI
The invention can also be used in an analogous manner for elimination of carbon dioxide from air and fuel gas for fuel cell generators with alkaline electro¬ lyte. Another related application is elimination of carbon dioxide from reaction air for chlor alkali cells with air cathodes, electro-chemical so-called oxygen generators with air cathodes etc. There are also many applications outside the proper electro-chemical energy technology, e.g. removal of carbon dioxide from the atmosphere aboard submarines, space vehicles etc.
The invention is concerned with an apparatus and a pro¬ cedure for removal of carbon dioxide from gas mixtures characterized in that it comprises a fixed bed absorp¬ tion reactor containing one body or a multitude of bodies of a supporting material, the surface of which at least consists of porous aluminum oxide or aluminate impregnated with a carbonate of an alkali metal.
The invention will now be described by means of the drawing. Figure 1 shows in principal a metal/air battery with an absorption reactor for air purificatio .
Figures 2 and 3 shov; two embodiments of the fixed bed reacto
The basic process for the invention is the reaction between sodium carbonate and carbon dioxide at a tem¬ perature below - 100 C preferably < 50 C.
Na2C03 + C02 + H20 →- 2 NaHC03.
The sodium carbonate is regenerated by heat treatment at a temperature above 100°C, preferably 150-200°C.
2 NaHC03 →- Na2C03 + H20 + C02.
OMPI
These reactions are carried out in an absorption rector with the active carbonate absorbed in porous bodies or elements e.g. monolith structures which are exposed to the gas flow.
The carrier material consists of aluminum oxide,Al-O-, > or is a mixture of aluminum oxide or aluminate with other resistant oxides like magnesium oxide, zirconium oxide, heat stabilized silicon dioxide, silicates etc.
It has been proposed to use a finely ground mixture of potassium carbonate and aluminum oxide for carbon dioxide removal (the U.S. patent 3,865,924). In this case the particles of carbonate and aluminum oxide were separated from each other ("discrete separate particles"). The strong catalytic action with our invention is apparently caused by the impregnation procedure.
The presence of aluminum oxide or aluminate in the carrying material is necessary for the technical effect of the invention. It is here apparently a question of a completely unexpected catalytical effect on the reac- tion between carbonate and carbon dioxide. It is not necessary to add moisture to the gases. The small quantitities water vapor which are normally present in air and fuel gas are quite sufficient for fast reaction. The reaction between solid carbonate without carrier is to the contrary very slow under otherwise comparable conditions. If the air is moistened a compact cake is formed.
The absorption reactor is designed in the same way as a catalytic reactor e.g. of the type which is used for exhaust gas cleaning in cars i.e. a pellet bed or mono¬ lith structure. The absorption reactor is dimensioned preferably for one battery cycle. The height should be
0,2 meter or somewhat above.
Regeneration can take place by means of electrical heat or in connection with the charging procedure. Regene¬ ration may also take place by means of exhaust gas heat in case of hybride systems.
Another application is a fuel cell generator of the alkaline type intended to replace-the mechanically driven alternating current generator for heavy trucks. In this particular application the hydrogen for the fuel cell generator is produced by steam reforming of methanol. Absorption reactors according to the in¬ vention can be used as well for purification of the fuel gas as for the reaction air. The exhaust gas heat from the main engine is used for regeneration of the absorption reactors with a scheme with several parallell reactors in a permutated cycle of operation.
The application of the invention for a metal air battery is shown in Figure 1. The description that follows shall adhere to this embodiment which,however, should not be considered a restriction of the scope of the invention.
Figure 1 shows completely schematically an iron/air battery with circulating electrolyte according to the U.S. patent 3,801,376 . The battery is air cooled. Cooling air and process air are coming into direkt contact with the electrolyte. Figure 1 shows the battery pile (1) which is enclosed in a surrounding electrolyte vessel (2) . The air comes into contact with the air electrodes in an air chamber which is not shown. The air flow in the air chamber is shown by dotted flow arrows (3) . The electrolyte is circula¬ ting through the electrolyte chamber (4) via over flow
(5) to the electrolyte trough (6) in the battery vessel. The electrolyte flow is shown with the flow arrows (7) .
Air is supplied by means of two fans, one is governed by the temperature (8) and the other one (9) by the air demand for the discharge current in question. There is also a heat exchanger- (10) in the air system for recovery of water. Pre-heat of the process air is taking place in the battery vessel since the process air is first supplied to the surrounding vessel whereby the air is heated up in contact with the hot electrolyte whi¬ le at the same time the air is taking up moisture.
The system contains also an electrical heater (11) which is used for heating up the battery during cold whether and for regeneration of the absorption reactor (12) . Regeneration is taking place by means of the heat element (13). Air with a temperature around 150 - 200°C is* flowing up through the absorption reac¬ tor and is taking with it evaporated carbon dioxide. The air is taken in through the valve (14) which is opened for the regeneration procedure.
Figure 2 shows a simple embodiment of such an absorp¬ tion reactor which thus consists of a vessel contai¬ ning a bed of porous pellets of activated aluminum oxide (15) . Examples of suitable commercially available carriers of this kind are BASF D10-10 or Kebo 1.1108. Impregnation is taking place with e.g. saturated sodium carbonate solution around 50 C whereafter the pellets are dried in an oven at around 150 C for two hours. Potassium carbonate can also be used but it is not more efficient than the cheaper sodium carbonate. Addition of sodium arsenite, which is a known catalyst for this reaction, does not give a further improvement of the
catalytic action of the carrier.
The vessel is furnished with an inlet and an outlet. In this case the electrical element (13) is situated in the bed.
Figure 3 shows another embodiment with a carrier in the form of a monolith' structure (16) like those which are used for exhaust gas cleaning or final combustion of stack gases from wood stoves etc. The porous carrier of aluminum oxide has been impregnated with a sodium carbonate solution.
The process is complicated with several steps. The reaction is not studied in the literature and it has not been possible to elucidate which step is rate determining. The absorption is, however, taking place rapidly and with a high efficiency i a.small reactor volume thanks to a not clarified catalytic action devel¬ oped by the carrier.
An electric car with an iron/air battery for 20 kW and
25 k h designed in principle according to Figure 1 was supplied with an absorption reactor ("carbonate cartridge") according to Figure 2. The reactor had a
3 volume of 15 dm with a height of 2,5 dm. The bed consisted of pellets with beads of 4 mm diameter of
BAST D 10-10 which had been impregnated with sodium carbonate as described above. The treated air flow had a carbon dioxide concentration of 37,5 ppm, which was measured after 1 hour of operation, to be compared with the inlet concentration 360 ppm. In a comparative experiment with an active carrier of active silicon dioxide BASF D11-11 under otherwise identical conditions the carbon dioxide content was reduced only to 310 ppm.
Claims
1. Apparatus for removal of carbon dioxide from gas mixtures c h a r a c t e r i z e d in that it com¬ prises a fixed bed absorption reactor (12) contain¬ ing one body or a multitude of bodies (15,16) of a supporting material, the surface of which at least consists of porous aluminum oxide or aluminate impregnated with a carbonate of an alkali metal.
2. Apparatus according'; to claim 1 c h a r a c t e r i¬ z e d in that the absorption reactor (12) contains a multitude of bodies (15) the surface of which at least consists of porous aluminum oxide or aluminate impregnated with a carbonate of an alkali metal.
3. Apparatus according to claim 1 c h a r a c t e r i¬ z e d in that the absorption reactor' (12) contains a monolith reactor (16) the surface of which at least consists of porous aluminum oxide or aluminate im¬ pregnated with a carbonate of an alkali metal.
4. Procedure for removal of carbon dioxide from gas mixtures c h a r a c t e r i z e d in that the gas mixture is brought into contact with a fixed bed of one or a multitude of bodies of a supporting material (15,16) the surface of which at least consists of porous aluminum oxide or aluminate impregnated with a carbonate of an alkali metal, at a temperature be¬ low about 100°C, whereby alkali metal hydrogen carbo¬ nate is formed, said hydrogen carbonate then being decomposed to carbonate and carbon dioxide by heat treatment at a temperature above 100 C.
_OM?I
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8207022A SE8207022L (en) | 1982-12-08 | 1982-12-08 | SET AND DEVICE FOR CARBON Dioxide REMOVAL |
| SE8207022 | 1982-12-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0160648A1 true EP0160648A1 (en) | 1985-11-13 |
Family
ID=20348929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP84900134A Withdrawn EP0160648A1 (en) | 1982-12-08 | 1983-12-07 | Means and procedure for removal of carbon dioxide |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0160648A1 (en) |
| JP (1) | JPS60500165A (en) |
| SE (1) | SE8207022L (en) |
| WO (1) | WO1984002283A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5595949A (en) * | 1994-03-18 | 1997-01-21 | Electric Fuel (E.F.L.) Ltd., | Scrubber system for removing carbon dioxide from a metal-air or fuel cell battery |
| GB2305139A (en) * | 1995-09-12 | 1997-04-02 | Electric Fuel | Coated absorbent particles for a carbon dioxide scrubber system |
| US5899187A (en) * | 1996-07-11 | 1999-05-04 | Jenbacher Energiesysteme Aktiengesellschaft | Engine arrangement |
| JP2004534186A (en) * | 2001-06-15 | 2004-11-11 | ジーテック コーポレーション | No / low emission and co-production energy supply station |
| US20070141430A1 (en) * | 2005-12-21 | 2007-06-21 | Qunjian Huang | Gas scrubber and method related thereto |
| JP2014133219A (en) * | 2013-01-11 | 2014-07-24 | Ngk Insulators Ltd | Gas removal device and gas removal method using the same |
| US10074884B2 (en) | 2015-05-19 | 2018-09-11 | Samsung Electronics Co., Ltd. | Metal air battery having air purification module and method of operating the metal air battery |
| CN113856399A (en) * | 2021-10-31 | 2021-12-31 | 中国船舶重工集团公司第七一八研究所 | Equipment for removing carbon dioxide based on cyclic regeneration mode |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE101390C (en) * | ||||
| US3232028A (en) * | 1962-07-02 | 1966-02-01 | Isomet Corp | Composition and method for absorption and regeneration of carbon dioxide |
| US3865924A (en) * | 1972-03-03 | 1975-02-11 | Inst Gas Technology | Process for regenerative sorption of CO{HD 2 |
-
1982
- 1982-12-08 SE SE8207022A patent/SE8207022L/en not_active Application Discontinuation
-
1983
- 1983-12-07 JP JP84500206A patent/JPS60500165A/en active Pending
- 1983-12-07 WO PCT/SE1983/000433 patent/WO1984002283A1/en unknown
- 1983-12-07 EP EP84900134A patent/EP0160648A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8402283A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| SE8207022L (en) | 1984-06-09 |
| JPS60500165A (en) | 1985-02-07 |
| SE8207022D0 (en) | 1982-12-08 |
| WO1984002283A1 (en) | 1984-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
| 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 |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19850813 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: LINDSTROEM, OLLE Inventor name: HOEGLUND, LARS, OLOF |