CN100420081C - Separated area current detecting system for proton exchange film fuel cell - Google Patents
Separated area current detecting system for proton exchange film fuel cell Download PDFInfo
- Publication number
- CN100420081C CN100420081C CNB2006101142081A CN200610114208A CN100420081C CN 100420081 C CN100420081 C CN 100420081C CN B2006101142081 A CNB2006101142081 A CN B2006101142081A CN 200610114208 A CN200610114208 A CN 200610114208A CN 100420081 C CN100420081 C CN 100420081C
- Authority
- CN
- China
- Prior art keywords
- anode
- current
- cathode
- membrane electrode
- reaction
- 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.)
- Expired - Fee Related
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 28
- 239000012528 membrane Substances 0.000 claims abstract description 74
- 238000012360 testing method Methods 0.000 claims abstract description 42
- 239000007789 gas Substances 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012495 reaction gas Substances 0.000 claims abstract description 5
- 239000003566 sealing material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 210000004027 cell Anatomy 0.000 description 45
- 239000003054 catalyst Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000003487 electrochemical reaction Methods 0.000 description 2
- 238000003411 electrode reaction Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Fuel Cell (AREA)
Abstract
This invention relates to a regional current test system for proton exchange membrane fuel batteries including an anode collecting board, a membrane electrode and a cathode collecting board, in which, an anode gas flow field is processed on the anode collecting board to provide a flow channel for the anode gas, collect current generated by the membrane electrode and bring out the current, besides, the membrane electrode provides reaction field for anode and cathode reaction gas, and the proton exchange membrane conducts proton and water to finish the reaction, cathode and anode provide reaction field for various gas and convey current to the collecting board. A reaction gas flow field is processed on the cathode collecting board to provide a flow channel for the cathode gas and collect current generated by the membrane electrode to carry it to outside current.
Description
Technical Field
The invention belongs to the technical field of fuel cells, and particularly relates to a regional current testing system for a proton exchange membrane fuel cell. The method is applied to the local current test of proton exchange membrane fuel cells (proton exchange membrane fuel cells).
Background
With the progress of human civilization, the consumption of traditional energy sources such as coal, oil and natural gas continuously rises, which causes serious pollution to the earth, and causes the worsening of link problems such as greenhouse effect and acid rain. Humans have clearly appreciated and recognized that the reserves of natural energy sources are limited and, if continually abused, may be depleted in the near future. Therefore, new alternative energy sources are recently researched in various countries of the world, and fuel cells (fuel cells) are one of the main choices with development potential and practical value. Compared with the traditional internal combustion engine, the fuel cell has the advantages of high energy conversion efficiency, no pollution, low noise, no use of traditional fuel oil and the like.
In short, a fuel cell is a power generation device that generates electrical energy by electrochemically reacting hydrogen and oxygen, which can be said to be basically a reverse reaction of water electrolysis to convert its chemical energy into electrical energy. Taking a proton exchange membrane fuel cell as an example, each of the cells has a structure substantially as shown in fig. 1, and includes a Proton Exchange Membrane (PEM) 10 located at the center, a catalyst layer 11 disposed on each side of the PEM, a Gas Diffusion Layer (GDL) disposed outside the PEM, an anode plate 13 and a cathode plate 14 disposed on the outermost sides of the PEM, and a cell body formed by tightly bonding the two structures together. Since a plurality of the above-mentioned single cells are generally stacked in series in practical use of the fuel cell, as shown in fig. 2, sufficient power generation efficiency can be obtained; therefore, the cells connected in series and adjacent to each other can share an electrode plate, as shown in fig. 3, to serve as an anode and a cathode in two adjacent cells, respectively, so that the electrode plate is generally called a bipolar plate (bipolar plate). The bipolar plates are generally provided with a plurality of grooves on both sides, as shown in fig. 3, for conveying gases for reaction, such as hydrogen and air (for supplying oxygen), and discharging the products after reaction, if liquid water and water exist in the fuel cell system, the current generated by the membrane electrode is led out to the plate together, and then discharged through an external circuit. For the single cell test system, the current generated by the membrane electrode is led to the collector plate together, and then the relevant test content is carried out. In the case of membrane electrodes, the cathode and anode are integral electrodes that are tightly connected to the proton exchange membrane, and since either the cathode or the anode is electrically conductive, the current flow through the cathode and the anode is not only perpendicular to the normal direction of the membrane, but also exists facing the current flow. The method is mainly caused by the factors of gas flow channels on the polar plate, uniformity of a catalyst on the electrode and the like. This directly results in non-uniform current flow across the membrane electrode, large area current flow, and small area current flow. However, the electrode and the current collecting plate are integrated and have good conductivity, so that after the membrane electrode generates uneven reaction, the current is redistributed on the electrode and the current collecting plate, so that the current is uniformly distributed after passing through the current collecting plate.
Because fuel cells produce different electrochemical reactions at the cathode and anode, the current is produced at the cathode and anode in different regimes. The cathode gas and the anode gas flow in the respective gas flow channels, and are influenced by the respective flow channels; the cathode and anode electrode catalyst compositions are also different; these factors together result in different current distributions being generated at the cathode and anode of the fuel cell. In order to more carefully study the reaction process of the fuel cell and the influence of various factors, the cathode and the anode of the cell were individually tested.
Disclosure of Invention
The invention aims to provide a proton exchange membrane fuel cell regional current testing system which can better test the cathode and the anode of a fuel cell and ensure the accuracy of the test.
The invention is used for researching the influence of the flow field form on the fuel cell. Can be tested by assembling a cell using the structure of the invention on one end and a conventional flow field plate on the other end. The influence of the flow field on the membrane electrode is researched by testing the current magnitude of different areas.
The invention researches the discharge condition of the membrane electrode in the cell. The discharge of the membrane electrode inside the cell can be studied by using different membrane electrode catalyst compositions in different zones.
The invention comprises the following steps: anode current collector, membrane electrode and cathode current collector.
An anode current collector plate on which an anode gas flow field 16 is processed to provide a flow channel of anode gas is formed at the anode current collector plate 17. Collecting the current generated by the membrane electrode, and bringing the current out of an external circuit;
the membrane electrode provides reaction sites for anode and cathode reaction gases, and a proton exchange membrane conducts protons and water to complete the reaction; the cathode and the anode provide reaction sites for various gases and deliver current to the collector plate;
and a cathode current collecting plate on which a reaction gas flow field is processed to provide a flow channel of the cathode gas 18. And collecting the current generated by the membrane electrode and bringing the current out of an external circuit.
The anode current collecting plate is provided with 20-60 independent small electrodes, so that local current on the membrane electrode can be independently led out; the space between the small electrode and the anode current collecting plate is filled with an insulating sealing material 20, so that the sealing and insulating effects are achieved; the flow field through which the anode gas flows is processed on the whole anode current collecting plate, so that the anode gas can reach the membrane electrode through the flow field to react.
The anode of the membrane electrode is divided into 20-60 independent small anodes, and the small anodes and the large anodes have the same characteristics or different characteristics, so that reaction sites are provided for anode reaction; each small anode is completely and independently insulated from the large anode; the proton exchange membrane 10 is a complete membrane, separates the cathode and anode reaction gases, conducts protons and water, and provides a reaction site for cathode reaction, wherein the cathode is a whole cathode or a cathode divided into independent areas; the cathode and the anode are heated on the proton exchange membrane to be hot-pressed into an integral membrane electrode.
The cathode collector plate is divided into 20-60 independent small electrodes and a large cathode, and the space between each small electrode and the large cathode plate is independently filled with an insulating sealing material; and processing a flow field on the whole cathode collector plate, providing a flow channel for cathode counter gas to flow, and discharging water generated by reaction.
The invention has the advantages that: the testing system can accurately test the local current of the membrane electrode, can eliminate the inaccuracy of a testing structure caused by current facing and can truly reflect the magnitude of the current generated in a local area. The testing system can test how different flow field plates affect the membrane electrode reaction, and the membrane electrode, the anode current collecting plate and the cathode current collecting plate to be tested in the system are assembled into a single cell for testing, so that the difference of the cathode current field plates, which causes the difference of the local current of the membrane electrode, can be tested, and the optimization of the flow field plates is facilitated, as shown in fig. 4; the system can also test the influence of different catalyst compositions of the membrane electrode in different areas on the fuel cell, and test the actual current magnitude of different areas by testing the different compositions of the membrane electrode catalyst in different areas, thereby providing a test basis for the composition of the membrane electrode catalyst, as shown in fig. 5.
Drawings
Fig. 1 is a schematic sectional exploded view showing the structure of a conventional fuel cell unit. The proton exchange membrane comprises a proton exchange membrane 10, a catalyst layer 11, a gas diffusion layer 12, an anode plate 13, a cathode plate 14 and a groove 16.
Fig. 2 is a schematic sectional view showing an exploded structure of a battery cell in which a plurality of conventional battery cells are combined.
Fig. 3 is a schematic sectional view showing a partial structure of a conventional fuel cell. Among them, a bipolar plate 15.
Fig. 4 is a schematic sectional view showing a test of local current using a single anode current collecting plate. The anode collector plate 17, the cathode collector plate 18, the small metal electrode 19, the absolute pressure sealing material 20, the large anode electrode 21, the small anode electrode 22 and the large cathode electrode 23.
Fig. 5 is a schematic sectional view showing a test of local current using a bipolar current collector. Wherein the cathode small electrode 24.
Fig. 6 is a schematic sectional view showing a local current test using a single cathode current collector. Wherein,
FIG. 7 is a schematic view showing a membrane electrode for local current test.
FIG. 8 is a schematic view showing a membrane electrode assembly for anode partial current test.
Fig. 9 is a schematic view showing a membrane electrode for bipolar local current test.
FIG. 10 is a schematic view showing a membrane electrode for a cathode partial current test.
Detailed Description
The present invention relates to a local current density testing system for a fuel cell, and is mainly directed to a local current testing system for a proton exchange membrane fuel cell, one embodiment of which is shown in fig. 5, and includes an anode current collecting plate 17 for guiding a reaction current and providing a flow channel for a reaction gas, in the case of a proton exchange membrane fuel cell, the anode gas is hydrogen. A plurality of independent metal small electrodes 19 are wrapped on the anode current collecting large plate, the small electrodes and the current collecting large plate are sealed by insulating materials 20, so that the small electrodes and the anode current collecting large plate are absolutely insulated, and an anode flow field 16 is processed on an anode current collecting plate formed by the small electrodes and the anode current collecting large plate together to provide a circulation channel for hydrogen. The cathode collector plate is of the same construction as the anode collector plate and provides a flow path for the cathode gas, which in the case of a pem fuel cell is air. The invention also comprises a membrane electrode, the anode 21 of the membrane electrode is composed of a catalyst layer and a diffusion layer, a plurality of independent small anodes 22 are arranged on the anode, each small anode is independent from the big anode, and a certain gap is reserved between each small anode and the big anode so as to insulate each small anode from the big anode. The small anode 22 and the independent small electrode 19 on the anode current collecting plate 17 and the cathode current collecting plate 18 in the invention are mutually corresponding to form a plurality of independent small cells, so that each small cell is not influenced by the reaction of the large membrane electrode consisting of the large anode 21, the large cathode 23 and the large membrane electrode in the reaction process, the test process is more accurate, and the inaccurate factor of the test result due to the support of current is avoided.
In the preferred embodiment, as shown in fig. 4, the cathode of the testing system is a conventional cathode collector plate 14, and the testing system can correspondingly test the flow field of the cathode to check the influence on the membrane electrode. The anode gas reaches the anode electrode 21 of the membrane electrode through the gas channel on the anode current collecting plate 17, and the electrochemical reaction of the anode occurs under the action of the catalyst. Since there are a plurality of small partitions in different regions on the anode current collecting plate and the anode electrode, the reaction on the small partitions can be performed independently of the large anode. The reaction on each small subarea is different due to different diffusion degrees of the flow field and the gas, so that currents with different sizes are generated, and the currents reach an external circuit through respective metal electrodes to be tested, so that the purpose of circuits in different areas of the toilet is achieved. The influence of different cathode flow field plates on the membrane electrode reaction is tested by combining the research and the test of the cathode flow field plate. As in the present example, the effective reaction area of the membrane electrode was 400cm2, the number of independent small cells was 35, and the effective reaction area of each small electrode was about 1cm 2. The reaction temperature was 65 ℃ and the gas working pressure was 0.3MPa (absolute pressure). Tests show that the current at the cathode inlet of the cell is higher than that at the cathode outlet of the cell, and the current in the middle part of the cell is higher than that in other parts of the cell.
Secondly, the present invention is designed such that the test system can be used in cells with different cathode flow fields, as shown in fig. 6. The membrane electrode can be designed to carry out partition test in different areas according to the requirements of different cathode flow fields, and the membrane electrode can be divided into denser independent partitions in a more important test area, so that the test precision and accuracy can be improved. Because the membrane electrode in the system adopts the hot-press molding technology, the membrane electrode can be reused, and the test cost can be reduced, as shown in fig. 7, 8 and 9. The cathode and anode current collecting plates can be matched with the membrane electrode independently for use, the influence of different catalyst compositions of the membrane electrode can be tested when the cathode and anode current collecting plates are used simultaneously, and the influence of an anode flow field or a cathode flow field on the membrane electrode can be tested when the anode and anode current collecting plates are used independently.
Claims (1)
1. A proton exchange membrane fuel cell regional current test system comprises an anode collector plate, a membrane electrode and a cathode collector plate; it is characterized in that the preparation method is characterized in that,
an anode current collecting plate, wherein an anode gas flow field (16) is processed on the anode current collecting plate (17) to provide a flow channel of anode gas, collect current generated by the membrane electrode and carry the current out of an external circuit;
the membrane electrode provides reaction sites for anode and cathode reaction gases, and a proton exchange membrane conducts protons and water to complete the reaction; the cathode and the anode provide reaction sites for various gases and deliver current to the collector plate;
the cathode collector plate is used for processing a reaction gas flow field on the cathode collector plate (18) so as to provide a flow channel of cathode gas, collecting current generated by the membrane electrode and bringing the current out of an external circuit;
20-60 independent small electrodes are arranged on the anode current collecting plate, and local current on the membrane electrode can be independently led out; an insulating sealing material (20) is filled between the small electrode and the anode current collecting plate to achieve the effects of sealing and insulating; the flow field through which the anode gas flows is processed on the whole anode current collecting plate, so that the anode gas can reach the membrane electrode through the flow field to react.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101142081A CN100420081C (en) | 2006-11-01 | 2006-11-01 | Separated area current detecting system for proton exchange film fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101142081A CN100420081C (en) | 2006-11-01 | 2006-11-01 | Separated area current detecting system for proton exchange film fuel cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1945887A CN1945887A (en) | 2007-04-11 |
| CN100420081C true CN100420081C (en) | 2008-09-17 |
Family
ID=38045156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101142081A Expired - Fee Related CN100420081C (en) | 2006-11-01 | 2006-11-01 | Separated area current detecting system for proton exchange film fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100420081C (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222796B (en) * | 2010-04-16 | 2014-03-26 | 中国科学院大连化学物理研究所 | Proton exchange membrane fuel cell structure for measuring oxygen concentration distribution |
| CN103063714B (en) * | 2012-12-31 | 2014-12-10 | 同济大学 | Online test system and method for alternating-current impedances of fuel cell zones |
| CN103245920B (en) * | 2013-04-10 | 2015-08-19 | 同济大学 | The multi-functional on-line testing printed circuit board (PCB) of a kind of fuel cell |
| CN104111425B (en) * | 2013-04-18 | 2016-12-28 | 同济大学 | A kind of cold boot of fuel cell subregion Performance Test System and method of testing |
| CN107543942B (en) * | 2017-08-18 | 2024-04-12 | 浙江科技学院（浙江中德科技促进中心） | Test fixture and test method for membrane electrode |
| CN107681180B (en) * | 2017-09-21 | 2020-03-24 | 电子科技大学 | Device for detecting and controlling fuel cell |
| CN109802154A (en) * | 2018-12-03 | 2019-05-24 | 一汽解放汽车有限公司 | Make the fuel cell of collector with diffusion layer |
| CN109742427A (en) * | 2018-12-03 | 2019-05-10 | 一汽解放汽车有限公司 | Make the fuel cell of collector with membrane electrode |
| CN112986825B (en) * | 2019-12-13 | 2021-12-07 | 中国科学院大连化学物理研究所 | Battery testing device |
| CN112986489B (en) * | 2019-12-14 | 2022-03-11 | 中国科学院大连化学物理研究所 | Device for testing performance of single-cell membrane electrode of cathode open stack |
| CN113720890A (en) * | 2021-08-31 | 2021-11-30 | 上海纳尔终能氢电有限公司 | Method for rapidly detecting whether membrane electrode mass transfer and drainage are normal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040095127A1 (en) * | 2002-10-28 | 2004-05-20 | Masahiro Mohri | Apparatus for measuring current density of fuel cell |
| US20050064251A1 (en) * | 2003-05-27 | 2005-03-24 | Intematix Corp. | Electrochemical probe for screening multiple-cell arrays |
| JP2006196261A (en) * | 2005-01-12 | 2006-07-27 | Denso Corp | Current measuring device of fuel cell |
-
2006
- 2006-11-01 CN CNB2006101142081A patent/CN100420081C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040095127A1 (en) * | 2002-10-28 | 2004-05-20 | Masahiro Mohri | Apparatus for measuring current density of fuel cell |
| US20050064251A1 (en) * | 2003-05-27 | 2005-03-24 | Intematix Corp. | Electrochemical probe for screening multiple-cell arrays |
| JP2006196261A (en) * | 2005-01-12 | 2006-07-27 | Denso Corp | Current measuring device of fuel cell |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1945887A (en) | 2007-04-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100420081C (en) | Separated area current detecting system for proton exchange film fuel cell | |
| CN105161737B (en) | Fuel-cell device | |
| CN104617324B (en) | Fuel battery pack with testing function | |
| CN100418261C (en) | Direct liquid feed fuel cell stack | |
| WO2016095238A1 (en) | Method and device for detecting pile consistency of proton exchange membrane fuel cell | |
| CN111244496B (en) | Fuel cell and flow distribution device | |
| TW200402165A (en) | Solid polymer cell assembly | |
| US9608285B2 (en) | Stack for a solid oxide fuel cell using a flat tubular structure | |
| CN105161739B (en) | Fuel-cell device | |
| US7169496B2 (en) | Fuel Cell | |
| CN101442131A (en) | Current-collecting composite plate for fuel cell and fuel cell fabricated using same | |
| Gundlapalli et al. | Case studies of operational failures of vanadium redox flow battery stacks, diagnoses and remedial actions | |
| CN102110838B (en) | Proton exchange membrane fuel cell stack | |
| KR20070037207A (en) | Separator and fuel cell using the same | |
| KR20120012262A (en) | flat-tubular solid oxide cell stack | |
| KR100953533B1 (en) | fuel cell | |
| KR20190058583A (en) | Electrochemical reaction cell stack | |
| EP3579317B1 (en) | Electrochemical reaction unit and electrochemical reaction cell stack | |
| CN109669135B (en) | Fuel cell multiple spot analysis method | |
| CN115839990B (en) | Water electrolysis observation and electrochemical performance testing device | |
| JPS61126775A (en) | Fuel cell | |
| KR20090114829A (en) | Fuel cell | |
| KR101008738B1 (en) | Fuel Cell Assembly | |
| KR100531821B1 (en) | Apparatus for supplying air of fuel cell | |
| CN100582791C (en) | Device for measuring resistivity of graphite plate or carbon diffusion layer material for fuel cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20111101 |