CN101415963B - 滑动轴承 - Google Patents
滑动轴承 Download PDFInfo
- Publication number
- CN101415963B CN101415963B CN2007800118942A CN200780011894A CN101415963B CN 101415963 B CN101415963 B CN 101415963B CN 2007800118942 A CN2007800118942 A CN 2007800118942A CN 200780011894 A CN200780011894 A CN 200780011894A CN 101415963 B CN101415963 B CN 101415963B
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 19
- 239000010687 lubricating oil Substances 0.000 claims abstract description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 abstract description 25
- 239000002184 metal Substances 0.000 abstract description 16
- 229910052751 metal Inorganic materials 0.000 abstract description 16
- 238000005461 lubrication Methods 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 66
- 239000000314 lubricant Substances 0.000 description 58
- 230000003068 static effect Effects 0.000 description 33
- 239000000463 material Substances 0.000 description 20
- 230000001050 lubricating effect Effects 0.000 description 11
- 230000008859 change Effects 0.000 description 7
- 239000004519 grease Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000006253 efflorescence Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 206010037844 rash Diseases 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 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
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 239000008041 oiling agent Substances 0.000 description 1
- 238000009702 powder compression Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
- F16C33/1065—Grooves on a bearing surface for distributing or collecting the liquid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
- F16C17/026—Sliding-contact bearings for exclusively rotary movement for radial load only with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
试样编号 | 槽根数根 | 滑动面的宽度A mm | 槽的宽度Bmm | A/B | 槽的深度mm | 静摩擦系数 | 动摩擦系数 | 备考 |
01 | 300 | 0.50 | 0.34 | 1.48 | 0.70 | 0.15 | 0.12 | 存在变形 |
02 | 150 | 1.00 | 0.68 | 1.48 | 0.70 | 0.12 | 0.10 | |
03 | 75 | 2.00 | 1.35 | 1.48 | 0.70 | 0.11 | 0.10 | |
04 | 50 | 3.00 | 2.03 | 1.48 | 0.70 | 0.11 | 0.10 |
05 | 30 | 5.00 | 3.38 | 1.48 | 0.70 | 0.12 | 0.10 | |
06 | 21 | 7.00 | 4.97 | 1.41 | 0.70 | 0.14 | 0.12 | |
07 | 18 | 8.30 | 5.66 | 1.47 | 0.70 | 0.21 | 0.15 | |
08 | 180 | 1.00 | 0.40 | 2.52 | 0.70 | 0.18 | 0.14 | |
09 | 141 | 1.28 | 0.50 | 2.55 | 0.70 | 0.13 | 0.12 | |
10 | 100 | 1.80 | 0.71 | 2.52 | 0.70 | 0.12 | 0.11 | |
11 | 60 | 3.00 | 1.19 | 2.52 | 0.70 | 0.11 | 0.10 | |
12 | 38 | 4.74 | 1.87 | 2.53 | 0.70 | 0.11 | 0.10 | |
13 | 34 | 4.30 | 3.09 | 1.39 | 0.70 | 0.12 | 0.10 | |
14 | 31 | 4.71 | 3.40 | 1.39 | 0.70 | 0.12 | 0.10 | |
15 | 27 | 5.41 | 3.90 | 1.39 | 0.70 | 0.12 | 0.10 | |
16 | 21 | 6.97 | 5.00 | 1.39 | 0.70 | 0.13 | 0.12 | |
17 | 19 | 7.69 | 5.54 | 1.39 | 0.70 | 0.20 | 0.15 | |
18 | 72 | 1.00 | 2.49 | 0.40 | 0.70 | 0.18 | 0.14 | |
19 | 72 | 1.16 | 2.33 | 0.50 | 0.70 | 0.13 | 0.12 | |
20 | 72 | 1.75 | 1.74 | 1.01 | 0.70 | 0.12 | 0.11 | |
21 | 72 | 2.07 | 1.42 | 1.46 | 0.70 | 0.11 | 0.10 | |
22 | 72 | 2.49 | 1.00 | 2.49 | 0.70 | 0.11 | 0.10 | |
23 | 72 | 2.80 | 0.69 | 4.05 | 0.70 | 0.11 | 0.10 | |
24 | 72 | 2.91 | 0.58 | 5.01 | 0.70 | 0.13 | 0.11 | |
25 | 72 | 3.00 | 0.49 | 6.11 | 0.70 | 0.21 | 0.16 | |
26 | 36 | 2.00 | 4.98 | 0.40 | 0.70 | 0.19 | 0.15 | |
27 | 36 | 2.32 | 4.66 | 0.50 | 0.70 | 0.13 | 0.12 |
28 | 36 | 3.49 | 3.49 | 1.00 | 0.70 | 0.12 | 0.11 | |
29 | 36 | 4.66 | 2.32 | 2.01 | 0.70 | 0.11 | 0.10 | |
30 | 36 | 5.25 | 1.73 | 3.03 | 0.70 | 0.11 | 0.10 | |
31 | 36 | 5.60 | 1.38 | 4.05 | 0.70 | 0.11 | 0.10 | |
32 | 36 | 5.82 | 1.16 | 5.01 | 0.70 | 0.13 | 0.12 | |
33 | 36 | 6.00 | 0.98 | 6.11 | 0.70 | 0.20 | 0.15 | |
34 | 72 | 2.07 | 1.42 | 1.46 | 0.05 | 0.21 | 0.16 | |
20 | 72 | 1.75 | 1.74 | 1.01 | 0.70 | 0.12 | 0.11 | |
35 | 72 | 2.07 | 1.42 | 1.46 | 0.10 | 0.14 | 0.13 | |
36 | 72 | 2.07 | 1.42 | 1.46 | 0.50 | 0.12 | 0.11 | |
37 | 72 | 2.07 | 1.42 | 1.46 | 1.00 | 0.12 | 0.11 | |
38 | 72 | 2.07 | 1.42 | 1.46 | 2.00 | 0.11 | 0.10 | |
39 | 72 | 2.07 | 1.42 | 1.46 | 3.00 | 0.11 | 0.10 | |
40 | 72 | 2.07 | 1.42 | 1.46 | 3.50 | 0.11 | 0.10 | 存在变形 |
试样编号 | 倾斜角度 | 静摩擦系数 | 动摩擦系数 |
41 | 0 | 0.19 | 0.13 |
42 | 5 | 0.16 | 0.12 |
43 | 10 | 0.13 | 0.11 |
44 | 15 | 0.12 | 0.11 |
21 | 20 | 0.11 | 0.10 |
45 | 25 | 0.11 | 0.10 |
46 | 30 | 0.11 | 0.10 |
47 | 35 | 0.11 | 0.10 |
48 | 40 | 0.11 | 0.10 |
49 | 50 | 0.12 | 0.10 |
50 | 60 | 0.13 | 0.10 |
51 | 70 | 0.14 | 0.11 |
52 | 80 | 0.15 | 0.11 |
53 | 90 | 0.16 | 0.12 |
Claims (3)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006091884 | 2006-03-29 | ||
JP091884/2006 | 2006-03-29 | ||
PCT/JP2007/000309 WO2007122798A1 (ja) | 2006-03-29 | 2007-03-27 | すべり軸受 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN101415963A CN101415963A (zh) | 2009-04-22 |
CN101415963B true CN101415963B (zh) | 2010-12-01 |
Family
ID=38624717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN2007800118942A Active CN101415963B (zh) | 2006-03-29 | 2007-03-27 | 滑动轴承 |
Country Status (5)
Country | Link |
---|---|
US (1) | US8096709B2 (zh) |
JP (1) | JP5202307B2 (zh) |
KR (1) | KR101057306B1 (zh) |
CN (1) | CN101415963B (zh) |
WO (1) | WO2007122798A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103541996A (zh) * | 2013-10-30 | 2014-01-29 | 东方电气集团东方汽轮机有限公司 | 一种滑动轴承 |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8608386B2 (en) * | 2009-01-12 | 2013-12-17 | Dow Global Technologies Llc | Journal bearing design |
JP2011094746A (ja) * | 2009-10-30 | 2011-05-12 | Taiho Kogyo Co Ltd | すべり軸受 |
KR101747965B1 (ko) | 2009-12-22 | 2017-06-15 | 두산인프라코어 주식회사 | 슬라이딩 베어링 및 슬라이딩 베어링 조립체 |
DE102010040156A1 (de) * | 2010-09-02 | 2012-03-08 | Federal-Mogul Wiesbaden Gmbh | Schmutzleitnuten in geschmierten Gleitlagern |
CN103115076A (zh) * | 2013-03-29 | 2013-05-22 | 中国航空工业集团公司金城南京机电液压工程研究中心 | 一种具有螺旋冷却通道的滑动轴承 |
GB2508043B (en) | 2013-04-17 | 2015-07-22 | Messier Dowty Ltd | Dynamic bearing |
WO2015002289A1 (ja) * | 2013-07-05 | 2015-01-08 | Tpr株式会社 | 回転体軸および回転体構造ならびに車輪 |
JP6422443B2 (ja) * | 2013-12-27 | 2018-11-14 | 株式会社荏原製作所 | すべり軸受装置 |
US9557686B2 (en) * | 2015-04-24 | 2017-01-31 | Flo-Tech, Llc | Spring bearing for use in a developer cartridge roller system |
CN104863971B (zh) * | 2015-04-27 | 2017-05-10 | 张永斌 | 运用物理吸附形成的同心微型向心滑动轴承 |
EP3313719B1 (en) * | 2015-06-29 | 2024-01-24 | Saint-Gobain Performance Plastics Corporation | Linear motion system |
CN111022497B (zh) * | 2019-12-02 | 2021-05-28 | 燕山大学 | 一种带有导液孔道的径向磁液双悬浮轴承导磁套 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1084618A (zh) * | 1993-04-19 | 1994-03-30 | 杜长春 | 自泵油润滑式径向力滑动轴承 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3185433B2 (ja) * | 1992-12-29 | 2001-07-09 | オイレス工業株式会社 | 内周面に固体潤滑剤を埋設固定した円筒状軸受 |
US5704718A (en) * | 1995-07-14 | 1998-01-06 | Ntn Corporation | Sintered oil-impregnated bearing and method for manufacturing same |
US5746516A (en) * | 1995-08-11 | 1998-05-05 | Hitachi Powdered Metals Co., Ltd. | Porous bearing system having internal grooves and electric motor provided with the same |
JPH10231841A (ja) * | 1997-02-21 | 1998-09-02 | Daido Metal Co Ltd | すべり軸受 |
DE19947462C1 (de) * | 1999-10-02 | 2000-10-26 | Simon Karl Gmbh & Co Kg | Sintergleitlager für Motoren und Getriebe |
CA2311096C (en) * | 2000-06-02 | 2010-02-16 | Peter T. Markovitch | Bearing and bushing assembly |
US20020112319A1 (en) * | 2001-02-21 | 2002-08-22 | Makoto Kida | Hinge |
JP2002323034A (ja) * | 2001-02-21 | 2002-11-08 | Makoto Kida | ヒンジ装置 |
JP4581283B2 (ja) * | 2001-03-30 | 2010-11-17 | 日本電産株式会社 | 動圧軸受装置、回転駆動装置および記録装置 |
JP4204233B2 (ja) | 2002-01-30 | 2009-01-07 | 日立粉末冶金株式会社 | 焼結含油滑り軸受および建設機械油圧ショベルまたはクレーン |
JP2004301258A (ja) * | 2003-03-31 | 2004-10-28 | Toshiba Corp | ジャーナル軸受 |
JP2005265010A (ja) * | 2004-03-17 | 2005-09-29 | Ishikawajima Harima Heavy Ind Co Ltd | 動圧気体軸受 |
US8027330B2 (en) * | 2004-06-23 | 2011-09-27 | Qualcomm Incorporated | Efficient classification of network packets |
JP4271624B2 (ja) * | 2004-06-23 | 2009-06-03 | 日立粉末冶金株式会社 | 建設機械の関節用すべり軸受 |
-
2007
- 2007-03-27 CN CN2007800118942A patent/CN101415963B/zh active Active
- 2007-03-27 US US12/224,656 patent/US8096709B2/en active Active
- 2007-03-27 JP JP2008511956A patent/JP5202307B2/ja active Active
- 2007-03-27 WO PCT/JP2007/000309 patent/WO2007122798A1/ja active Application Filing
- 2007-03-27 KR KR1020087024695A patent/KR101057306B1/ko active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1084618A (zh) * | 1993-04-19 | 1994-03-30 | 杜长春 | 自泵油润滑式径向力滑动轴承 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103541996A (zh) * | 2013-10-30 | 2014-01-29 | 东方电气集团东方汽轮机有限公司 | 一种滑动轴承 |
Also Published As
Publication number | Publication date |
---|---|
JP5202307B2 (ja) | 2013-06-05 |
WO2007122798A1 (ja) | 2007-11-01 |
CN101415963A (zh) | 2009-04-22 |
KR101057306B1 (ko) | 2011-08-16 |
JPWO2007122798A1 (ja) | 2009-08-27 |
US8096709B2 (en) | 2012-01-17 |
KR20080102296A (ko) | 2008-11-24 |
US20090067766A1 (en) | 2009-03-12 |
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Inventor after: Maruyama Kazuo Inventor after: Liu Laigang Inventor after: Maki Kunio Inventor after: Junyi Kobayashi Inventor after: Ma Duli Inventor before: Maruyama Kazuo Inventor before: Liu Laigang Inventor before: Maki Kunio Inventor before: Junyi Kobayashi |
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Address after: Tokyo Patentee after: Lishennoco Co.,Ltd. Address before: Tokyo, Japan Patentee before: Showa Materials Co.,Ltd. |
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Effective date of registration: 20230615 Address after: Tokyo, Japan Patentee after: Showa Materials Co.,Ltd. Address before: Chiba County, Japan Patentee before: HITACHI POWDERED METALS Co.,Ltd. |
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