EP1530812A2 - Fuel cell comprising a perforated film that distributes the combustible gas across the electrode surface - Google Patents
Fuel cell comprising a perforated film that distributes the combustible gas across the electrode surfaceInfo
- Publication number
- EP1530812A2 EP1530812A2 EP03740435A EP03740435A EP1530812A2 EP 1530812 A2 EP1530812 A2 EP 1530812A2 EP 03740435 A EP03740435 A EP 03740435A EP 03740435 A EP03740435 A EP 03740435A EP 1530812 A2 EP1530812 A2 EP 1530812A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel cell
- holes
- electrode
- fuel gas
- film
- 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- Withdrawn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
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
- H01M8/026—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant characterised by grooves, e.g. their pitch or depth
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0204—Non-porous and characterised by the material
- H01M8/0206—Metals or alloys
-
- 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
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
-
- 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
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
-
- 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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
-
- 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
- H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
- H01M8/241—Grouping of fuel cells, e.g. stacking of fuel cells with solid or matrix-supported electrolytes
- H01M8/2425—High-temperature cells with solid electrolytes
- H01M8/2432—Grouping of unit cells of planar configuration
-
- 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
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
-
- 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
- the invention relates to a fuel cell which, in addition to a cathode-electrolyte-anode unit, has a structure which distributes the fuel gas over its electrode surface and whose surface facing the electrode is formed by a perforated film.
- a fuel cell which, in addition to a cathode-electrolyte-anode unit, has a structure which distributes the fuel gas over its electrode surface and whose surface facing the electrode is formed by a perforated film.
- the cited document shows a solid oxide fuel cell (SOFC) in which, in addition to an independently prefabricated cathode-electrolyte-anode unit, an independent intermediate layer between the electrodes and the bipolar plates (known to the person skilled in the art) or partition plates is provided.
- This independent intermediate layer is designed as an electrically conductive, elastic and gas-permeable contact cushion with a deformable surface structure, the so-called cushion filling being a highly elastic metal fabric and the so-called cushion cover, for example, a perforated sheet.
- this so-called contact pad is to achieve optimal electrical contact between the electrodes, while at the same time a less exact surface quality, for example of the anodes and cathodes, can be accepted without there being any disadvantages in the (electrical) contacting within the fuel cell or a fuel cell stack or stack made up of a plurality of individual fuel cells.
- An essential criterion for an optimal fuel cell function is not only sufficient electrical contact between the individual cell elements, but almost equally important is a good flow against the fuel cell electrodes, in particular with the so-called fuel gas or working gas, but also with Oxygen or ambient air.
- an object of the present invention is to show an improvement in a fuel cell which, in addition to a cathode-electrolyte-anode unit, has a structure which distributes the fuel gas over its electrode surface and whose surface facing the electrode is formed by a perforated film ,
- the solution to this problem is characterized in that the longitudinal axes of at least some of the holes or passage openings forming the perforation are inclined with respect to the film surface.
- the flow direction of the fuel gas or air-oxygen to the respective electrode is at least partially oblique to the respective electrode surface in order to ensure a good supply of material to the affected electrode .
- the longitudinal axes of holes or through-openings which form the (known) perforation in said film, on the surface of which an electrode of the fuel cell rests, are inclined with respect to the film surface.
- the longitudinal axes of at least some of the holes or through openings forming the perforation can be inclined differently with respect to the film surface, depending on the location of the holes or through openings with respect to the fuel cell or the fuel gas flow conducted therein. So on the side of the fuel gas inlet or the fuel gas supply into the fuel cell, the electrode facing outlet openings of the holes should be at least slightly directed towards the side of the fuel gas outlet from the fuel cell, so that a targeted fuel gas flow also divides itself along the electrode surface and the fuel gas is consequently distributed relatively evenly over the electrode surface.
- the gas can optimally enter these through openings.
- the word "primarily" used above means that not all of the holes in the area mentioned need to be inclined in the manner described, rather only some of the holes can be inclined in this way and other holes in this area have a different or no inclination to the Have film surface.
- Holes or through-openings which are inclined with their longitudinal axes, which can also be referred to as bores, but also on the side of the fuel gas inlet (or the fuel gas supply) into the fuel cell are advantageous " if the inlet openings of these inlet-side holes (again In the same sense, on the side of the fuel gas outlet from the fuel cell, the outlet openings of these outlet-side holes (again primarily) can be at least slightly toward the fuel gas outlet (or on the side of the fuel gas) An optimal fuel gas flow is also achieved in this way, since the fresh fuel gas can both enter the respective passage openings well and the burned gas or the corresponding reaction products can pass well from the respective passage openings to the fuel gas outlet (to the fuel gas Discharge) emerges from the fuel cell If the respective passage openings have straight longitudinal axes, the respective passage openings can advantageously meet both the conditions described in this paragraph and the conditions described in the previous paragraph.
- holes whose inlet opening facing away from the electrode are directed at least slightly to the side of the fuel gas supply, and holes whose outlet opening facing away from the electrode is directed at least slightly towards the side of the fuel gas outlet of the fuel cell are substantially alternately provided side by side in the film.
- holes or passage openings in a film of a fuel cell against which an electrode of the fuel cell rests have a further advantage, with regard to a special fuel cell production process.
- the ceramic layers of the solid oxide fuel cell are produced individually, for example by sintering green compacts of the respective layers (namely cathode, electrolyte and anode), the individual electrode layers can be sequential, in particular metallic or ceramic Substrates are sprayed on.
- Suitable thermal spraying methods are suitable for this application by spraying, for example vacuum plasma spraying (also called vacuum plasma spraying), atmospheric plasma spraying, flame spraying, or others.
- the so-called substrate can form the load-bearing structure of the fuel cell, with porous and thus gas-permeable and at the same time current-conducting (and therefore mostly metallic), particularly for vacuum plasma-sprayed fuel cells, for this substrate. Materials are used to ensure the best possible supply of starting material, product removal and electrical power supply within the fuel cell.
- the perforated film now serves as such a carrier substrate for the electrode layers, to which the first electrode layer is consequently applied in powder form by a thermal spray process, then if the holes are made at an angle to the film surface, then one can be at right angles good powder retention can be achieved for the film or substrate surface of the spray coating process, without the diameter of the holes having to be significantly smaller than the diameter of the grains of the electrode powder to be applied.
- a fundamentally undesirable passage of the powder grains during thermal spraying thereof onto the film through the holes provided therein can be largely avoided due to the longitudinal axes of the holes which are inclined with respect to the film surface.
- the perforation in the film or the holes or passage openings or bores can be produced, for example, by means of a laser beam or electron beam or nuclear trace.
- these holes can also be formed by electrochemical processes or by masking and etching, all of the processes mentioned being particularly suitable for large-scale production.
- these holes preferably be made from the side of the film or the substrate that is not to be coated with the electrode material, because the holes are then on the back and thus on the application side for Elevations of the hole edges that arise from the electrode material are helpful for better interlocking of the ceramic electrode with the film (or a corresponding tape).
- the foil perforated according to the invention or a corresponding sheet or strip can consist of a suitable metallic material and can be assembled with a further structure to form a so-called cassette which has a cavity, this further structure likewise consisting of a metallic one Material exists, so that this composite structure can ultimately form a or the bipolar plate of the single fuel cell, onto which, more precisely on the perforated film, an electrode layer of the cathode-electrolyte-anode unit can be applied, for example by a thermal spraying process, almost directly can.
- the fuel gas or atmospheric oxygen can then be led to or away from the respective electrode via said cavity of this so-called cassette.
- This cassette is therefore a hollow body, which preferably consists of an upper shell and a lower shell, which are preferably welded together along their edges, are generally integrally connected in order to ensure sufficient gas tightness in this area.
- the previously perforated film as a substrate can preferably be welded into a so-called upper shell of the cassette, which can have a rectangular, square, round or any oval cutout.
- a corresponding film, tape or sheet is first perforated (in tape form or piece by piece) and then welded into a corresponding cutout in the upper shell of a fuel cell cassette to be produced.
- Such a weld seam replaces the sealing of the fuel cell in its bipolar plate, which is usually indispensable in the case of a planar solid oxide fuel cell, by means of glass solder or other ceramic or metallic adhesive.
- the cathode-electrolyte-anode unit can then be welded directly onto the welded-in method according to the manufacturing method according to the invention perforated metal foil are sprayed, the anode preferably being sprayed on using a spray mask up to just below the weld between the perforated foil and the upper shell.
- the electrolyte layer can then be applied to the anode layer with a larger mask, making it gas-tight and electrically insulated, and additionally the weld seam and a small edge of the sheet around it can be spray-sealed in the same operation using electrolyte material.
- the cathode layer can then be spray-applied exactly onto the surface of the anode using a mask.
- the upper shell can serve directly as a carrier substrate for the anode layer to be sprayed on. In this case, it has no recess. Instead, the upper shell itself is perforated in the area of the anode to be applied later by a thermal powder spraying process, so that the cassette upper shell itself is therefore the perforated film according to the invention.
- the perforation can be either before or after welding the two cassette halves, i.e. the above-mentioned upper shell with the lower shell mentioned.
- the cathode-electrolyte-anode unit is then applied as described for the first embodiment.
- the sealing function of the electrolyte is limited to the sealing of the porous anode layer.
- Attached is a single figure, in which a cross section through a cassette, as already mentioned above as a second embodiment, is shown in highly abstract form.
- This cassette forms a single solid oxide fuel cell and can therefore be part of a fuel cell stack or stack.
- the reference numeral 1 denotes a metallic foil, which at the same time represents the so-called upper shell of a so-called cassette 4. As can be seen, this is of course perforated over a certain length dimension perpendicular to the drawing plane, i.e. provided with holes 2, 2 ', the longitudinal axes 2a, 2a' of which are inclined with respect to the surface of the film 1.
- the upper shell 1 or film 1 forms the aforementioned cassette 4, which encloses a cavity 10.
- a metallic knitted wire or the like can be introduced into a partial area of this cavity 10, but this is not shown here.
- the upper shell 1 and the lower shell 3 are welded to one another in their edge regions, that is to say integrally and thus gas-tightly connected to one another via a weld seam 6 running all around.
- a cathode-electrolyte-anode unit 7 is applied to the outside of the film 1 or upper shell 1 facing away from the cavity 10, essentially in the area of overlap with the through openings or holes 2, 2 ', the layer adjacent to the film 1 being the anode layer 7A is.
- This is applied in the manufacturing process of a single fuel cell according to the invention as a first layer by means of a thermal powder spraying process (preferably by vacuum plasma spraying). Then, as already explained, an electrolyte layer 7E and a cathode layer 7K can be applied thereon.
- the fuel gas required for the fuel cell or for the electrochemical conversion process taking place therein is fed into the cavity 10 of the cassette 4, the fuel gas supply 8Z being in the area of the cavity 10 on the left in the drawing, while the fuel gas discharge 8A is in the right-hand section of the cassette cavity 10 lie.
- this fuel gas is suitably distributed to the individual holes 2, 2 ', so that it can then pass through them to the anode layer 7A and react there accordingly.
- the reaction products are also removed via holes 2 and 2 'for fuel gas removal 8A.
- holes 2 ' are aligned or inclined, which can primarily be in the area of the fuel gas discharge 8A or the fuel gas outlet 8A, although in the present exemplary embodiment holes 2 and holes 2' with their different inclinations described are essentially are equally distributed and are arranged next to one another distributed over the surface of the film 1.
- the longitudinal axes 2a 'of the holes 2' are at least slightly inclined, as shown in the figure, in such a way that they are inclined towards the film surface in such a way that in the area of the fuel gas discharge 8A, ie in the fuel gas outlet area, the fuel gas discharge 8A (and thus The outlet opening 2b 'facing away from the electrode 7A and the holes 2' located near the fuel gas outlet side is directed towards the fuel gas outlet 8A, so there is an improved outflow of burned gas out of these through openings or holes 2 '.
- a preferred angle of inclination between the longitudinal axes 2a or 2a 'of the holes 2 or 2' and the surface of the film 1 is in the order of 45 ° to 75 °.
- passage openings or holes 2 the openings 2b of which in the figure below are partially directed towards the supply of fuel gas 8Z, can take precedence provided in the area of this fuel gas supply 8Z, although a few holes 2 with such an inclined longitudinal axis 2a can also be provided in the area on the right-hand side in the figure near the fuel gas discharge 8A.
- passage openings or holes 2 ' are primarily provided in the area of this fuel gas discharge 8A, although a few holes 2 'with a longitudinal axis 2a' inclined in this way are also provided can be provided in the area on the left in the figure near the fuel gas supply 8B. (Deviating from this is the figurative representation with alternating, essentially equally distributed holes 2, 2 'and sealing openings 2, 2').
- fuel gas is supplied or removed to the anode layer 7A of the cathode-electrolyte-anode unit 7 via the holes or passage openings 2 or 2 ′, so that the desired electrochemical reaction takes place at the cathode-electrolyte-anode unit 7 can, it is (as is known) additionally required to apply oxygen to the cathode 7K.
- a certain amount of free space must also be created for this if, as is customary and known, several individual fuel cells in the form of the cassette 4 shown are stacked one above the other. This can be done by providing the outside 3a or, in the figure, the underside 3a of the lower shell 3 with a corresponding embossed structure that creates such free space.
- a suitable wire mesh 9 or the like can be attached (for example soldered) to the underside 3a of the lower shell 3. Either through the above-mentioned impressions or through this wire mesh 9, air-oxygen can then reach the cathode (7K) of an individual fuel cell or cassette lying in a fuel cell stack, not shown, below the individual fuel cell or cassette 4 shown in the figure.
- a fuel cell according to the invention is characterized on the basis of the proposed design of the holes 2, 2 'or passage openings by an optimized material transport, which has an advantageous effect on the efficiency of the fuel cell. Simple production is also possible for large series.
- the greatly improved flatness of the application surface for the anode layer 7A resulting from the use of the proposed film 1 enables the implementation of smaller thicknesses of the ceramic reaction layers (ie the cathode-electrolyte-anode unit 7) and thus both a lower material consumption and lower reaction losses due to fewer and optimized transport routes.
- the contact layer to the cathode 7K which is realized here by the wire mesh 9, there are then lower ohmic losses and lower transport resistances.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10238860A DE10238860A1 (en) | 2002-08-24 | 2002-08-24 | Fuel cell with a perforated film which distributes the fuel gas over the surface of the electrodes |
DE10238860 | 2002-08-24 | ||
PCT/EP2003/007307 WO2004021487A2 (en) | 2002-08-24 | 2003-07-08 | Fuel cell comprising a perforated film that distributes the combustible gas across the electrode surface |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1530812A2 true EP1530812A2 (en) | 2005-05-18 |
Family
ID=31197322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03740435A Withdrawn EP1530812A2 (en) | 2002-08-24 | 2003-07-08 | Fuel cell comprising a perforated film that distributes the combustible gas across the electrode surface |
Country Status (4)
Country | Link |
---|---|
US (1) | US7261969B2 (en) |
EP (1) | EP1530812A2 (en) |
DE (1) | DE10238860A1 (en) |
WO (1) | WO2004021487A2 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005353421A (en) * | 2004-06-10 | 2005-12-22 | Nissan Motor Co Ltd | Fuel cell |
DE102004045375A1 (en) | 2004-09-18 | 2006-03-23 | Bayerische Motoren Werke Ag | Solid oxide fuel cell with a metallic support structure |
JP4854237B2 (en) | 2004-10-22 | 2012-01-18 | 日産自動車株式会社 | Solid oxide fuel cell and stack structure |
EP1829143B1 (en) | 2004-12-21 | 2014-02-12 | Nissan Motor Company Limited | Startup method for fuel cell stack structure and fuel cell stack structure |
CN101416334B (en) * | 2004-12-21 | 2011-08-24 | 联合工艺公司 | High specific power solid oxide fuel cell stack |
DE102007034967A1 (en) | 2007-07-26 | 2009-01-29 | Plansee Se | Fuel cell and process for its production |
DE102010001702A1 (en) * | 2009-12-03 | 2011-06-09 | Evonik Degussa Gmbh | Perforated foil |
EP2538784B1 (en) | 2010-02-25 | 2015-09-09 | Merck Sharp & Dohme Corp. | Benzimidazole derivatives useful anti-diabetic agents |
RU2015106909A (en) | 2012-08-02 | 2016-09-27 | Мерк Шарп И Доум Корп. | ANTI-DIABETIC TRICYCLIC COMPOUNDS |
GB2591462B (en) | 2020-01-27 | 2022-04-20 | Ceres Ip Co Ltd | Interlayer for solid oxide cell |
DE102022203467A1 (en) | 2022-04-07 | 2023-10-12 | Robert Bosch Gesellschaft mit beschränkter Haftung | Diffusion layer for an electrochemical cell and method of producing a diffusion layer |
DE102022203465A1 (en) | 2022-04-07 | 2023-10-12 | Robert Bosch Gesellschaft mit beschränkter Haftung | Diffusion layer for an electrochemical cell and method of producing a diffusion layer |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4340153C1 (en) * | 1993-11-25 | 1995-03-09 | Solentec Ges Fuer Solare Und E | Device for making contact with the electrodes of high-temperature fuel cells |
US5840438A (en) * | 1995-08-25 | 1998-11-24 | Ballard Power Systems Inc. | Electrochemical fuel cell with an electrode substrate having an in-plane nonuniform structure for control of reactant and product transport |
US5976726A (en) * | 1997-05-01 | 1999-11-02 | Ballard Power Systems Inc. | Electrochemical cell with fluid distribution layer having integral sealing capability |
FR2764443B1 (en) * | 1997-06-10 | 1999-09-03 | Peugeot | FUEL CELL OF THE TYPE WITH PLATE-SHAPED REAGENT DISPENSERS |
US6379833B1 (en) * | 1998-08-07 | 2002-04-30 | Institute Of Gas Technology | Alternative electrode supports and gas distributors for molten carbonate fuel cell applications |
DE19853911A1 (en) * | 1998-11-23 | 2000-05-25 | Forschungszentrum Juelich Gmbh | Fuel cell with operating medium feed via perforated plate has electrolyte with electrodes on both sides; at least one electrode is separated from bounding channel or vol. by perforated plate |
US6770395B2 (en) * | 2000-10-23 | 2004-08-03 | Materials And Systems Research, Inc. | Internally manifolded, planar solid oxide fuel cell (SOFC) stack with an inexpensive interconnect |
-
2002
- 2002-08-24 DE DE10238860A patent/DE10238860A1/en not_active Withdrawn
-
2003
- 2003-07-08 WO PCT/EP2003/007307 patent/WO2004021487A2/en not_active Application Discontinuation
- 2003-07-08 EP EP03740435A patent/EP1530812A2/en not_active Withdrawn
-
2005
- 2005-02-24 US US11/063,620 patent/US7261969B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2004021487A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE10238860A1 (en) | 2004-03-04 |
US20050175884A1 (en) | 2005-08-11 |
US7261969B2 (en) | 2007-08-28 |
WO2004021487A2 (en) | 2004-03-11 |
WO2004021487A3 (en) | 2004-12-29 |
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Legal Events
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: YAN, XIAOFENG Inventor name: KUHN, BERND Inventor name: DANZER, MAXIMILIAN Inventor name: WETZEL, FRANZ-JOSEF Inventor name: HOEFLER, THOMAS Inventor name: FINKENWIRTH, OLAV Inventor name: STOERMER, ANDREAS, OSWALD |
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18D | Application deemed to be withdrawn |
Effective date: 20100202 |