WO2006008356A1 - Circuit integre comprenant un condensateur a electrodes metalliques et procede de fabrication d'un tel condensateur - Google Patents
Circuit integre comprenant un condensateur a electrodes metalliques et procede de fabrication d'un tel condensateur Download PDFInfo
- Publication number
- WO2006008356A1 WO2006008356A1 PCT/FR2005/001400 FR2005001400W WO2006008356A1 WO 2006008356 A1 WO2006008356 A1 WO 2006008356A1 FR 2005001400 W FR2005001400 W FR 2005001400W WO 2006008356 A1 WO2006008356 A1 WO 2006008356A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- capacitor
- electrode
- integrated circuit
- metal
- silicon
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 28
- 239000002184 metal Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000010703 silicon Substances 0.000 claims abstract description 15
- 229910000676 Si alloy Inorganic materials 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 229910021332 silicide Inorganic materials 0.000 claims description 11
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 11
- 238000001465 metallisation Methods 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 9
- 229920005591 polysilicon Polymers 0.000 description 9
- 229910052759 nickel Inorganic materials 0.000 description 7
- 238000013459 approach Methods 0.000 description 5
- 238000000151 deposition Methods 0.000 description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- -1 for example Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 229910005883 NiSi Inorganic materials 0.000 description 1
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 229910000449 hafnium oxide Inorganic materials 0.000 description 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 210000000352 storage cell Anatomy 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D1/00—Resistors, capacitors or inductors
- H10D1/60—Capacitors
- H10D1/68—Capacitors having no potential barriers
- H10D1/692—Electrodes
- H10D1/711—Electrodes having non-planar surfaces, e.g. formed by texturisation
- H10D1/712—Electrodes having non-planar surfaces, e.g. formed by texturisation being rough surfaces, e.g. using hemispherical grains
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D1/00—Resistors, capacitors or inductors
- H10D1/60—Capacitors
- H10D1/68—Capacitors having no potential barriers
- H10D1/692—Electrodes
- H10D1/711—Electrodes having non-planar surfaces, e.g. formed by texturisation
- H10D1/716—Electrodes having non-planar surfaces, e.g. formed by texturisation having vertical extensions
Definitions
- the present invention relates to integrated circuits, more particularly to metal-electrode capacitors. Capacitors are especially used in memory array memory cells.
- the manufacture of capacitors increasingly comes up against problems related to high densities of integration. Indeed, the increase of the integration density imposes the reduction of the surface of a memory cell, while maintaining an effective capacitance value. Thus, in current technologies, several approaches are possible. The most common is the formation of the capacitor in a trench to increase the surface of the capacitor without increasing the surface of the memory cell. The surface can be further increased by a factor of about 2. using as a lower electrode the hemispherical grain type doped polysilicon (HSG polysilicon).
- HSG polysilicon hemispherical grain type doped polysilicon
- An object of the present invention is to obtain capacitors of size adapted to integrated circuits of smaller and smaller size without reducing the value of their capacity.
- the present invention also aims to use metal electrodes to overcome the problems of doping and depletion capacity related to three-dimensional polysilicon electrodes, while keeping the morphology of a deposit of the hemispherical grain type.
- Capacitors according to the present invention also offer the advantage of having an efficient capacitance without increasing the leakage current of the dielectric.
- the present invention is therefore based on the silicidation (formation of a metal silicide) of a polysilicon electrode HSG, for example.
- the present invention thus proposes an integrated circuit comprising at least one metal electrode capacitor of which at least one of the two electrodes of the capacitor is formed of silicon or a silicon alloy of hemispherical grain type silicide at least on the surface.
- This electrode can thus be either partially silicided, or preferably entirely silicided, that is to say entirely formed of a metal silicide.
- the second metal electrode of the capacitor is also formed of a silicon layer or a silicon alloy of hemispherical grain type partially or wholly silicided.
- the second electrode of the capacitor may comprise a metal layer, for example TiN.
- the capacitor may have a planar or trench structure.
- the present invention also proposes a method for manufacturing a capacitor within an integrated circuit as defined above in which the elaboration of the first electrode comprises the production of a layer of silicon or an alloy of hemispherical grain-type silicon and siliciding of said layer at least on the surface.
- This method makes it possible to obtain a capacitor in which said first electrode can be either partially silicided or preferably entirely silicided.
- the second electrode is produced either analogously to the first electrode, that is to say by depositing polysilicon of the hemispherical grain type then siliciding, or by metal deposition, for example TiN .
- FIG. 1 schematically represents an integrated circuit according to a first embodiment of the present invention
- Figures 2 to 4 schematically illustrate the main steps of a method for obtaining the integrated circuit of Figure 1
- Figure 5 schematically show an integrated circuit according to a second embodiment of the present invention.
- FIG. 1 shows an integrated circuit IC according to the invention comprising a capacitor Cr. comprising two metal silicide electrodes of hemispherical grain type.
- the integrated circuit CI comprises a substrate SB, in which a hollow trench has been made comprising a first hemispherical grain type silicided metal electrode 10 surmounted by a dielectric 2, surmounted by a second metal silicide electrode of hemispherical grain type. 30.
- the reference SB designates a semiconductor substrate, for example made of silicon.
- a trench 4 is produced in the substrate SB in a conventional manner and known per se.
- the first electrode 10 is then produced.
- a layer 1 of silicon, germanium or a silicon alloy, such as, for example, silicon-germanium, of the hemispherical grain type is formed, also in a conventional manner and known per se, for example by deposition.
- Figure 3 The characteristics of such a repository are for example described in "Manufacturing and Performance of Selective HSG Storage Cells for 256 Mb and 1 Gb DRAM Applications, A. Banerjee, RL Wise, DL Plunton, M. Bevan, ML Crenshaw, S.Aoyama. and MM Mansoori, IEEE Transactions on Electron Devices, Vol. 47, No.3, March 2000 ".
- the layer 1 of silicon or of a hemispherical grain type silicon alloy has a thickness of 1000 to 1500 A.
- siliciding that is the formation of a metal silicide, is obtained from cobalt.
- this siliciding can be obtained from other metals such as, for example, tungsten, titanium or nickel.
- a layer of nickel on the layer 1 of silicon or of a hemispherical grain type silicon alloy is deposited, for example by a plasma vapor deposition (PVD deposition).
- PVD deposition plasma vapor deposition
- the thickness of the nickel layer is determined as a function of the phase and the thickness of metal silicide which it is finally desired to obtain, knowing that when nickel is used, 1 N of nickel gives 2.2 A of silicide.
- a first initial annealing is carried out, typically at a temperature below 600 ° C., for example at a temperature of 450 ° C. This annealing temperature depends on the nature of the metal used for siliciding.
- the nickel then reacts with the silicon of layer 1 to form NiSi (FIG. 4). Excess unreacted nickel can then be selectively removed from the silicide. This selective removal operation is carried out for example by wet etching.
- Such wet etching is conventional and known per se, and it uses, for example, a H 2 SO 4 : H 2 O 2 : H 2 O chemistry, or a HCl: H 2 O 2 : H 2 O chemistry. therefore in the presence of a silicided metal electrode with a hemispherical grain type morphology on which the dielectric 2 is deposited.
- the dielectric may be a conventional dielectric with a relative dielectric constant k of, for example, 5.
- k a relative dielectric constant
- the main improvement over the prior art comes from the improvement of the depletion capacities, the strong reduction of the series resistance and the simplification of the process insofar as it is not necessary to dope by implementation the electrodes silicon or silicon alloy, sometimes difficult operation especially on the sides of the trenches.
- the dielectric 2 is surmounted by the second electrode.
- the electrode 30 can be made analogously to the first electrode 10, that is to say by deposition of HSG polysilicon, then siliciding, preferably total, and removal of the metal having not reacted.
- the second electrode can also be made for example by direct deposition of metal (for example TiN) on the dielectric.
- the capacitor comprises a first hemispherical grain silicided metal electrode 10, surmounted by a dielectric 2, surmounted by a second metal electrode 31.
- the capacitors are not limited to trench structures, as described above, but can also be for example planar type.
Landscapes
- Semiconductor Integrated Circuits (AREA)
- Semiconductor Memories (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/570,731 US7781296B2 (en) | 2004-06-18 | 2005-06-07 | Integrated circuit comprising a capacitor with metal electrodes and process for fabricating such a capacitor |
JP2007515985A JP2008503077A (ja) | 2004-06-18 | 2005-06-07 | 電極を有するキャパシタを備えた集積回路およびキャパシタを製造するための方法 |
EP05775544A EP1774576A1 (fr) | 2004-06-18 | 2005-06-07 | Circuit integre comprenant un condensateur a electrodes metalliques et procede de fabrication d'un tel condensateur |
US12/861,256 US8975682B2 (en) | 2004-06-18 | 2010-08-23 | Integrated circuit comprising a capacitor with HSG metal electrodes |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0406674A FR2871935A1 (fr) | 2004-06-18 | 2004-06-18 | Circuit integre comprenant un condensateur a elecrodes metalliques et procede de fabrication d'un tel condensateur |
FR0406674 | 2004-06-18 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/570,731 A-371-Of-International US7781296B2 (en) | 2004-06-18 | 2005-06-07 | Integrated circuit comprising a capacitor with metal electrodes and process for fabricating such a capacitor |
US12/861,256 Division US8975682B2 (en) | 2004-06-18 | 2010-08-23 | Integrated circuit comprising a capacitor with HSG metal electrodes |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006008356A1 true WO2006008356A1 (fr) | 2006-01-26 |
Family
ID=34946896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2005/001400 WO2006008356A1 (fr) | 2004-06-18 | 2005-06-07 | Circuit integre comprenant un condensateur a electrodes metalliques et procede de fabrication d'un tel condensateur |
Country Status (6)
Country | Link |
---|---|
US (2) | US7781296B2 (fr) |
EP (1) | EP1774576A1 (fr) |
JP (1) | JP2008503077A (fr) |
CN (1) | CN1957442A (fr) |
FR (1) | FR2871935A1 (fr) |
WO (1) | WO2006008356A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9496326B1 (en) | 2015-10-16 | 2016-11-15 | International Business Machines Corporation | High-density integrated circuit via capacitor |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5998824A (en) * | 1995-09-25 | 1999-12-07 | Lg Semicon Co., Ltd. | Capacitor structure having a lower electrode with a rough surface, a plurality of metal layers and a nitridation treated film |
US20010001210A1 (en) * | 1999-06-25 | 2001-05-17 | Rhodes Howard E. | Capacitor Structures |
US20020020866A1 (en) * | 1998-07-10 | 2002-02-21 | Joo-Won Lee | Method for manufacturing a capacitor having a two-layer lower electrode |
US20030020122A1 (en) * | 2001-07-24 | 2003-01-30 | Joo Jae Hyun | Methods of forming integrated circuit electrodes and capacitors by wrinkling a layer that includes a noble metal oxide, and integrated circuit electrodes and capacitors fabricated thereby |
US20030038325A1 (en) * | 1998-09-04 | 2003-02-27 | Yasuhiro Sugawara | Semiconductor device and method of fabricating the same |
US20030123216A1 (en) * | 2001-12-27 | 2003-07-03 | Yoon Hyungsuk A. | Deposition of tungsten for the formation of conformal tungsten silicide |
US6682970B1 (en) * | 1998-02-27 | 2004-01-27 | Micron Technology, Inc. | Capacitor/antifuse structure having a barrier-layer electrode and improved barrier layer |
US20040245560A1 (en) * | 2003-06-03 | 2004-12-09 | Marsela Pontoh | Methods of forming rugged electrically conductive surfaces and layers |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH03230561A (ja) * | 1990-02-06 | 1991-10-14 | Mitsubishi Electric Corp | 半導体装置およびその製造方法 |
DE4321638A1 (de) * | 1992-09-19 | 1994-03-24 | Samsung Electronics Co Ltd | Halbleiterspeicherbauelement mit einem Kondensator und Verfahren zu seiner Herstellung |
US6348708B1 (en) * | 1995-04-10 | 2002-02-19 | Lg Semicon Co., Ltd. | Semiconductor device utilizing a rugged tungsten film |
JP2839076B2 (ja) * | 1995-05-11 | 1998-12-16 | 日本電気株式会社 | 半導体装置およびその製造方法 |
KR100259039B1 (ko) | 1997-02-17 | 2000-06-15 | 윤종용 | 반도체장치의커패시터제조방법 |
US6255159B1 (en) * | 1997-07-14 | 2001-07-03 | Micron Technology, Inc. | Method to form hemispherical grained polysilicon |
US6033967A (en) * | 1997-07-21 | 2000-03-07 | Taiwan Semiconductor Manufacturing Co., Ltd. | Method for increasing capacitance in DRAM capacitors and devices formed |
US6143617A (en) * | 1998-02-23 | 2000-11-07 | Taiwan Semiconductor Manufacturing Company | Composite capacitor electrode for a DRAM cell |
KR100319888B1 (ko) * | 1998-06-16 | 2002-01-10 | 윤종용 | 선택적 금속층 형성방법, 이를 이용한 커패시터 형성 및 콘택홀 매립방법 |
DE10109218A1 (de) * | 2001-02-26 | 2002-06-27 | Infineon Technologies Ag | Verfahren zur Herstellung eines Speicherkondensators |
CN1204616C (zh) | 2001-12-20 | 2005-06-01 | 国际商业机器公司 | 用sige bicmos集成方案制造多晶-多晶电容器的方法 |
US6664161B2 (en) * | 2002-05-01 | 2003-12-16 | International Business Machines Corporation | Method and structure for salicide trench capacitor plate electrode |
US6815753B2 (en) * | 2002-08-29 | 2004-11-09 | Micron Technology, Inc. | Semiconductor capacitor structure and method to form same |
US6858487B2 (en) * | 2003-01-02 | 2005-02-22 | United Microelectronics Corp. | Method of manufacturing a semiconductor device |
-
2004
- 2004-06-18 FR FR0406674A patent/FR2871935A1/fr active Pending
-
2005
- 2005-06-07 WO PCT/FR2005/001400 patent/WO2006008356A1/fr active Application Filing
- 2005-06-07 JP JP2007515985A patent/JP2008503077A/ja active Pending
- 2005-06-07 EP EP05775544A patent/EP1774576A1/fr not_active Withdrawn
- 2005-06-07 US US11/570,731 patent/US7781296B2/en active Active
- 2005-06-07 CN CN200580016703.2A patent/CN1957442A/zh active Pending
-
2010
- 2010-08-23 US US12/861,256 patent/US8975682B2/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5998824A (en) * | 1995-09-25 | 1999-12-07 | Lg Semicon Co., Ltd. | Capacitor structure having a lower electrode with a rough surface, a plurality of metal layers and a nitridation treated film |
US6682970B1 (en) * | 1998-02-27 | 2004-01-27 | Micron Technology, Inc. | Capacitor/antifuse structure having a barrier-layer electrode and improved barrier layer |
US20020020866A1 (en) * | 1998-07-10 | 2002-02-21 | Joo-Won Lee | Method for manufacturing a capacitor having a two-layer lower electrode |
US20030038325A1 (en) * | 1998-09-04 | 2003-02-27 | Yasuhiro Sugawara | Semiconductor device and method of fabricating the same |
US20010001210A1 (en) * | 1999-06-25 | 2001-05-17 | Rhodes Howard E. | Capacitor Structures |
US20030020122A1 (en) * | 2001-07-24 | 2003-01-30 | Joo Jae Hyun | Methods of forming integrated circuit electrodes and capacitors by wrinkling a layer that includes a noble metal oxide, and integrated circuit electrodes and capacitors fabricated thereby |
US20030123216A1 (en) * | 2001-12-27 | 2003-07-03 | Yoon Hyungsuk A. | Deposition of tungsten for the formation of conformal tungsten silicide |
US20040245560A1 (en) * | 2003-06-03 | 2004-12-09 | Marsela Pontoh | Methods of forming rugged electrically conductive surfaces and layers |
Also Published As
Publication number | Publication date |
---|---|
CN1957442A (zh) | 2007-05-02 |
FR2871935A1 (fr) | 2005-12-23 |
US20080185681A1 (en) | 2008-08-07 |
EP1774576A1 (fr) | 2007-04-18 |
US8975682B2 (en) | 2015-03-10 |
JP2008503077A (ja) | 2008-01-31 |
US7781296B2 (en) | 2010-08-24 |
US20100320567A1 (en) | 2010-12-23 |
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