CN1102670C - 无方向性电磁钢片及其制造方法 - Google Patents
无方向性电磁钢片及其制造方法 Download PDFInfo
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- CN1102670C CN1102670C CN00109074A CN00109074A CN1102670C CN 1102670 C CN1102670 C CN 1102670C CN 00109074 A CN00109074 A CN 00109074A CN 00109074 A CN00109074 A CN 00109074A CN 1102670 C CN1102670 C CN 1102670C
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
Description
| 钢 | 化 学 组 成 (质量%、其余Fe) | 备 注 | ||||||||
| C | Si | Mn | Al | P | S | N | Si+Al+0.5Mn | Al/Si | ||
| A | 0.003 | 2.8* | 0.20 | 1.0 | 0.013 | 0.005 | 0.0007 | 3.9 | 0.36 | |
| B | 0.003 | 1.9 | 0.20 | 1.9 | 0.013 | 0.007 | 0.0008 | 3.9 | 1.00 | |
| C | 0.002 | 2.0 | 0.17 | 1.8 | 0.012 | 0.005 | 0.0008 | 3.9 | 0.90 | |
| D | 0.001 | 1.9 | 0.22 | 2.4 | 0.013 | 0.005 | 0.0007 | 4.4 | 1.26 | |
| E | 0.003 | 1.8 | 0.20 | 2.0 | 0.013 | 0.006 | 0.0007 | 3.9 | 1.11 | |
| F | 0.003 | 0.8 | 0.18 | 3.0 | 0.013 | 0.005 | 0.0007 | 3.9 | 3.75 | |
| G | 0.003 | 0.6 | 0.23 | 3.2 | 0.012 | 0.005 | 0.0009 | 3.9 | 5.33 | |
| H | 0.002 | 0.1 | 0.20 | 3.8 | 0.013 | 0.005 | 0.0007 | 4.0 | 38 | |
| I | 0.002 | 3.0* | 0.30 | 0.01* | 0.012 | 0.006 | 0.0007 | 3.2 | 0.003 | |
| J | 0.003 | 0.9 | 0.19 | 2.3 | 0.013 | 0.006 | 0.0009 | 3.3 | 2.56 | |
| K | 0.002 | 0.5 | 0.31 | 2.5 | 0.013 | 0.005 | 0.0008 | 3.2 | 5.00 | |
| L | 0.003 | 0.1 | 0.31 | 2.9 | 0.013 | 0.005 | 0.0008 | 3.2 | 30 | |
| M | 0.003 | 2.2 | 0.20 | 1.6 | 0.013 | 0.007 | 0.0008 | 3.9 | 0.73 | |
| N | 0.003 | 1.6 | 0.20 | 2.2 | 0.013 | 0.005 | 0.0007 | 3.9 | 1.38 | |
| O | 0.003 | 0.8 | 0.20 | 1.5 | 0.013 | 0.007 | 0.0008 | 2.4* | 1.88 | |
| P | 0.003 | 3.0* | 0.20 | 2.0 | 0.013 | 0.005 | 0.0007 | 5.1* | 0.67 | |
| R | 0.001 | 1.7 | 2.0 | 2.0 | 0.013 | 0.005 | 0.0007 | 4.7 | 1.18 | |
| S | 0.001 | 1.6 | 1.2 | 2.0 | 0.013 | 0.005 | 0.0007 | 4.2 | 1.25 | |
| T | 0.002 | 2.0 | 0.20 | 1.8 | 0.012 | 0.005 | 0.0008 | 3.9 | 0.90 | B:0.0003 |
| U | 0.002 | 2.0 | 0.20 | 1.8 | 0.011 | 0.005 | 0.0009 | 3.9 | 0.90 | Sb:0.008 |
| V | 0.002 | 2.0 | 0.20 | 1.7 | 0.011 | 0.006 | 0.0009 | 3.8 | 0.85 | Sn:0.008 |
| 试验序号 | 钢 | 板坯加热温度(℃) | 热轧板退火温度(℃) | 片厚(mm) | 退火加工温度硬度(℃) | 硬度(Hvlkg) | 冲切性(次数) |
| 1 | C | 1150 | 820 | 0.27 | 1100 | 192 | 460000 |
| 2 | C | 1150 | 820 | 0.27 | 1060 | 196 | 430000 |
| 3 | C | 1150 | 820 | 0.27 | 980 | 208 | 360000 |
| 4 | C | 1150 | 820 | 0.27 | 900 | 220* | 290000 |
| 5 | F | 1120 | 800 | 0.27 | 1080 | 190 | 470000 |
| 6 | F | 1120 | 800 | 0.27 | 1000 | 205 | 370000 |
| 7 | F | 1120 | 800 | 0.27 | 900 | 217* | 300000 |
| 8 | F | 1100 | 无退火 | 0.27 | 1050 | 195 | 430000 |
| 9 | J | 1100 | 850 | 0.35 | 1000 | 146 | 690000 |
| 10 | J | 1100 | 850 | 0.35 | 950 | 143 | 740000 |
| 11 | J | 1100 | 850 | 0.35 | 900 | 150 | 720000 |
| 12 | J | 1100 | 850 | 0.35 | 875 | 156 | 680000 |
| 试验序号 | 钢 | Si+Al+0.5Mn | Al/Si | 片厚(mm) | 硬度(Hvlkg) | 晶粒粒径(μm) | W15/50(w/kg) | W15/400(w/kg) | B50(T) | 电机效率(%) | 表面光洁度Ra(μm) | 占空系数(%) |
| 1 | A* | 3.9 | 0.36 | 0.27 | 220* | 115 | 2.15 | 32.5 | 1.67 | 94.7 | 0.28 | 98.0 |
| 2 | B | 3.9 | 1.00 | 182 | 116 | 2.07 | 32.1 | 1.68 | 95.5 | 0.12 | 98.5 | |
| 3 | C | 3.9 | 0.90 | 185 | 120 | 2.08 | 32.1 | 1.67 | 95.2 | 0.27 | 97.6 | |
| 4 | E | 3.9 | 1.11 | 182 | 112 | 2.08 | 31.0 | 1.67 | 95.1 | 0.21 | 98.1 | |
| 5 | F | 3.9 | 3.75 | 164 | 114 | 2.16 | 32.5 | 1.67 | 94.9 | 0.27 | 97.7 | |
| 6 | G | 3.9 | 5.33 | 155 | 140 | 2.16 | 32.6 | 1.67 | 94.9 | 0.27 | 97.5 | |
| 7 | H | 4.0 | 38 | 146 | 116 | 2.19 | 32.8 | 1.66 | 94.8 | 0.12 | 98.6 | |
| 8 | H | 4.0 | 38 | 150 | 41* | 3.03 | 43.6 | 1.67 | 93.9 | 0.21 | 98.2 | |
| 9 | M | 3.9 | 0.73 | 189 | 118 | 2.10 | 32.2 | 1.67 | 95.1 | 0.27 | 97.6 | |
| 10 | N | 3.9 | 1.38 | 174 | 115 | 2.10 | 32.2 | 1.67 | 95.1 | 0.28 | 98.1 | |
| 11 | I* | 3.2 | 0.003 | 0.3 | 215* | 122 | 2.38 | 37.3 | 1.69 | 94.4 | 0.25 | 98.4 |
| 12 | J | 3.3 | 2.56 | 147 | 130 | 2.23 | 36.0 | 1.69 | 94.6 | 0.10 | 98.4 | |
| 13 | K | 3.2 | 5.00 | 142 | 121 | 2.31 | 36.5 | 1.69 | 94.4 | 0.40 | 97.9 | |
| 14 | L | 3.2 | 30 | 125* | 123 | 2.39 | 37.7 | 1.68 | 94.0 | 0.30 | 98.7 | |
| 15 | R | 4.7 | 1.18 | 190 | 109 | 2.09 | 34.8 | 1.67 | 94.9 | 0.27 | 98.6 | |
| 16 | S | 4.2 | 1.25 | 178 | 113 | 2.11 | 35.1 | 1.67 | 95.1 | 0.21 | 98.7 | |
| 17 | D | 4.4 | 1.26 | 0.35 | 196 | 130 | 2.03 | 38.0 | 1.66 | 94.8 | 0.28 | 98.0 |
| 18 | E | 3.9 | 1.11 | 185 | 110 | 2.13 | 40.0 | 1.68 | 94.5 | 0.45 | 98.0 | |
| 19 | O* | 2.4 | 1.88 | 127* | 112 | 2.41 | 44.0 | 1.69 | 93.3 | 0.35 | 98.0 | |
| 20 | P* | 5.1 | 0.67 | 230* | 108 | 2.11 | 38.0 | 1.62 | 94.1 | 0.26 | 98.7 | |
| 21 | F | 3.9 | 3.75 | 0.5* | 165 | 116 | 2.61 | 63.5 | 1.68 | 93.1 | 0.85* | 88.0 |
| 22 | F | 3.9 | 3.75 | 0.15 | 169 | 85 | 1.97 | 25.8 | 1.68 | 94.2 | 0.10 | 95.4 |
| 23 | T | 3.9 | 0.9 | 0.33 | 185 | 108 | 2.09 | 38.0 | 1.67 | 94.9 | 0.20 | 98.1 |
| 24 | U | 3.9 | 0.9 | 182 | 111 | 2.08 | 38.0 | 1.67 | 95.1 | 0.11 | 98.5 | |
| 25 | V | 3.8 | 0.85 | 184 | 98 | 2.09 | 38.0 | 1.67 | 95.0 | 0.15 | 98.8 |
Claims (17)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16975999 | 1999-06-16 | ||
| JP169759/1999 | 1999-06-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1278016A CN1278016A (zh) | 2000-12-27 |
| CN1102670C true CN1102670C (zh) | 2003-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00109074A Expired - Lifetime CN1102670C (zh) | 1999-06-16 | 2000-06-05 | 无方向性电磁钢片及其制造方法 |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US6340399B1 (zh) |
| KR (1) | KR100386378B1 (zh) |
| CN (1) | CN1102670C (zh) |
| TW (1) | TW476791B (zh) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107923019A (zh) * | 2015-10-02 | 2018-04-17 | 杰富意钢铁株式会社 | 无取向性电磁钢板及其制造方法 |
| CN107112124B (zh) * | 2014-12-26 | 2019-05-14 | 杰富意钢铁株式会社 | 层叠铁芯用材料及层叠铁芯的制造方法 |
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| CN1318627C (zh) * | 2001-06-28 | 2007-05-30 | 杰富意钢铁株式会社 | 无方向性电磁钢板及其制造方法 |
| US6803693B2 (en) * | 2002-04-11 | 2004-10-12 | General Electric Company | Stator core containing iron-aluminum alloy laminations and method of using |
| ATE338146T1 (de) * | 2002-05-08 | 2006-09-15 | Ak Steel Properties Inc | Verfahren zum kontinuierlichen giessen von nichtorientiertem elektrostahlband |
| ES2737983T3 (es) * | 2002-12-24 | 2020-01-17 | Jfe Steel Corp | Chapa de acero electromagnético no orientado de Fe-Cr-Si y proceso para producir la misma |
| KR100561996B1 (ko) * | 2003-04-10 | 2006-03-20 | 신닛뽄세이테쯔 카부시키카이샤 | 높은 자속 밀도를 갖는 무방향성 전자 강판의 제조 방법 |
| US20050000596A1 (en) * | 2003-05-14 | 2005-01-06 | Ak Properties Inc. | Method for production of non-oriented electrical steel strip |
| JP4681450B2 (ja) | 2005-02-23 | 2011-05-11 | 新日本製鐵株式会社 | 圧延方向の磁気特性に優れた無方向性電磁鋼板とその製造方法 |
| KR100721817B1 (ko) * | 2005-12-14 | 2007-05-28 | 주식회사 포스코 | 자성이 우수한 무방향성 전기강판 및 그 제조방법 |
| KR101011965B1 (ko) * | 2005-12-15 | 2011-01-31 | 제이에프이 스틸 가부시키가이샤 | 고강도 무방향성 전자 강판 및 그 제조 방법 |
| CN103732794B (zh) * | 2011-08-31 | 2015-10-14 | 杰富意钢铁株式会社 | 具有绝缘被膜的电磁钢板 |
| JP5533958B2 (ja) | 2012-08-21 | 2014-06-25 | Jfeスチール株式会社 | 打抜加工による鉄損劣化の小さい無方向性電磁鋼板 |
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| JP5855792B2 (ja) * | 2013-04-16 | 2016-02-09 | 日本発條株式会社 | モータのロータ・コアに用いる磁性板及びその製造方法 |
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| CN105449941B (zh) * | 2015-12-30 | 2017-12-12 | 信质电机股份有限公司 | 无刷电机磁钢圈卷绕机 |
| JP6478061B2 (ja) | 2016-04-04 | 2019-03-06 | Jfeスチール株式会社 | 非晶質合金薄帯 |
| CN106130201A (zh) * | 2016-06-23 | 2016-11-16 | 无锡新大力电机有限公司 | 一种新型电机转子 |
| CN105958671A (zh) * | 2016-06-23 | 2016-09-21 | 无锡新大力电机有限公司 | 一种新型电机定子 |
| RU2722359C1 (ru) | 2016-10-27 | 2020-05-29 | ДжФЕ СТИЛ КОРПОРЕЙШН | Лист из нетекстурированной электротехнической стали и способ его изготовления |
| JP6665794B2 (ja) | 2017-01-17 | 2020-03-13 | Jfeスチール株式会社 | 無方向性電磁鋼板およびその製造方法 |
| DE102017103619A1 (de) * | 2017-02-22 | 2018-08-23 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Elektromotor, Innenrotor und Rotorblech |
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| JP3395391B2 (ja) | 1994-08-22 | 2003-04-14 | 日本鋼管株式会社 | 薄物無方向性電磁鋼板の製造方法 |
| US5798001A (en) * | 1995-12-28 | 1998-08-25 | Ltv Steel Company, Inc. | Electrical steel with improved magnetic properties in the rolling direction |
| JP3527020B2 (ja) * | 1996-07-10 | 2004-05-17 | 新日本製鐵株式会社 | インバータ制御コンプレッサーモーター用の無方向性電磁鋼板 |
| KR100449575B1 (ko) * | 1997-08-15 | 2004-11-16 | 제이에프이 스틸 가부시키가이샤 | 자기특성이 우수한 전기강판 및 그 제조방법 |
| JP3307872B2 (ja) | 1998-02-06 | 2002-07-24 | 新日本製鐵株式会社 | 無方向性電磁鋼板鋼板を用いた電気自動車用モータ及びその電磁鋼板の製造方法 |
-
2000
- 2000-06-05 CN CN00109074A patent/CN1102670C/zh not_active Expired - Lifetime
- 2000-06-08 KR KR10-2000-0031296A patent/KR100386378B1/ko not_active Expired - Fee Related
- 2000-06-14 US US09/593,744 patent/US6340399B1/en not_active Expired - Lifetime
- 2000-06-15 TW TW89111753A patent/TW476791B/zh not_active IP Right Cessation
-
2001
- 2001-11-02 US US09/985,444 patent/US6638368B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0849044A (ja) * | 1994-08-05 | 1996-02-20 | Kawasaki Steel Corp | 電気自動車用無方向性電磁鋼板およびその製造方法 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107112124B (zh) * | 2014-12-26 | 2019-05-14 | 杰富意钢铁株式会社 | 层叠铁芯用材料及层叠铁芯的制造方法 |
| US10927430B2 (en) | 2014-12-26 | 2021-02-23 | Jfe Steel Corporation | Material for laminated iron core, and method of manufacturing laminated iron core |
| CN107923019A (zh) * | 2015-10-02 | 2018-04-17 | 杰富意钢铁株式会社 | 无取向性电磁钢板及其制造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| US6340399B1 (en) | 2002-01-22 |
| CN1278016A (zh) | 2000-12-27 |
| US20020043299A1 (en) | 2002-04-18 |
| TW476791B (en) | 2002-02-21 |
| KR100386378B1 (ko) | 2003-06-02 |
| KR20010007290A (ko) | 2001-01-26 |
| US6638368B2 (en) | 2003-10-28 |
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