WO2003015147A1 - Wafer holding ring for chemical and mechanical polisher - Google Patents
Wafer holding ring for chemical and mechanical polisher Download PDFInfo
- Publication number
- WO2003015147A1 WO2003015147A1 PCT/JP2002/007973 JP0207973W WO03015147A1 WO 2003015147 A1 WO2003015147 A1 WO 2003015147A1 JP 0207973 W JP0207973 W JP 0207973W WO 03015147 A1 WO03015147 A1 WO 03015147A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- holding ring
- resin composition
- ring
- chemical mechanical
- 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.)
- Ceased
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/27—Work carriers
- B24B37/30—Work carriers for single side lapping of plane surfaces
- B24B37/32—Retaining rings
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10P—GENERIC PROCESSES OR APPARATUS FOR THE MANUFACTURE OR TREATMENT OF DEVICES COVERED BY CLASS H10
- H10P52/00—Grinding, lapping or polishing of wafers, substrates or parts of devices
Definitions
- the present invention relates to a wafer-holding ring for chemical mechanical polishing (hereinafter referred to as CMP) equipment.
- CMP chemical mechanical polishing
- the CMP apparatus is generally as shown in FIG. Fig. 1 (a) is a cross-sectional view along the center axis of rotation, and (b) is a top view.
- the apparatus includes a rotating base 1 having a flat surface, at least one polishing pad 2 provided on the surface of the base and rotating with the base, and means for supplying slurry to the polishing pad (not shown). ), Facing the polishing pad and surrounding the periphery of the semiconductor wafer 13 on its surface. It has a holding ring 4 (sometimes called a retainer ring or a carrier ring) for holding, and a carrier 5 for holding the wafer together with the wafer holding ring.
- a holding ring 4 sometimes called a retainer ring or a carrier ring
- the semiconductor device may have a vibration generating means for generating a relative vibration between the polishing pad and the semiconductor wafer. Then, the surface of the wafer 3 is polished by rotating the rotating base 1 while supplying the slurry to the contact surface between the wafer 13 and the polishing pad 2.
- Some CMP devices are as shown in the cross-sectional view of FIG. 1 (c).
- the wafer 3 is pressed against the polishing pad by the member 5 inside the wafer holding ring 4 and polished.
- the wafer instead of the member pressing the wafer against the polishing pad, the wafer can be pressed against the polishing pad by compressed air or the like.
- the slurry used for polishing usually contains an abrasive and an alkaline or acidic liquid for chemically reacting and dissolving the metal layer or the oxide layer.
- the polishing target whose surface can be planarized using this CMP method covers a wide range of oxide films, polysilicon films, metal films, etc., so the most suitable polishing agent or slurry composition is selected according to the polishing target.
- Typical abrasives used in CMP slurries include colloidal silica, fumed silica, precipitated alumina, fumed alumina, and the like.
- colloidal silica or fumed silica is generally used. Dosilica is often used.
- colloidal silica is usually produced from Kei oxygen Ichida (N a 2 S i 0 3 ).
- the wafer holding ring has the purpose of accurately holding the semiconductor wafer at the time of polishing and changing and adjusting the surface polishing state of the semiconductor wafer. Since it is polished and worn due to contact with the polishing pad, it must be replaced after a certain amount of wear.
- a hard material may be used to reduce wear.
- Conventional wafer retaining rings made of hard materials include: Metals such as lumina and titanium were used. However, when using metal, the wafer may be contaminated by the metal used. Further, during the polishing operation, the outer edge of the wafer sometimes collided with the inner peripheral surface of the wafer holding ring and was damaged.
- Japanese Unexamined Patent Publication No. Hei 8-187657 discloses a wafer holding ring made of ceramics. However, although the wear resistance of such a wafer-retaining ring is improved, the wafer may be damaged as in the case of the metal wafer-retaining ring.
- Japanese Patent Application Laid-Open No. 2000-502241 discloses that an inner peripheral portion of a wafer holding ring made of a wear-resistant material, that is, a contact surface with a wafer is formed of a soft material. There is disclosed a method for causing this to occur. Since this wafer retaining ring is premised on that the soft material in the inner peripheral part is worn out, it must be set thicker than the conventional wafer retaining ring in advance. Special designs are required for devices that use rings. Summary of the Invention
- the wafer holding ring for a chemical mechanical polishing apparatus of the present invention is a wafer holding ring for holding a wafer in a chemical mechanical polishing apparatus, and at least contacts a wafer of the wafer holding ring.
- the surface of the part which can be formed is made of a resin composition containing at least 30% by weight or more of polybenzoimidazole.
- This wafer-retaining ring for chemical mechanical polishing equipment prevents wafer breakage, and is excellent in abrasion resistance, oxidation-decomposition resistance and hydrolysis resistance, and enables mass production of polishing wafers by reducing replacement work. Something that can be achieved. BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a schematic view of a chemical mechanical polishing apparatus, (a) is an elevational sectional view, and (b) is a top view.
- FIG. 2 is a schematic view of a cross-sectional structure of a wafer holding ring according to the present invention. Detailed description of the invention
- the polybenzimidazole that can be used as the material of the article of the present invention is a heterocyclic polymer having excellent heat stability, oxidation resistance, hydrolysis resistance, and the like. And an aromatic, aliphatic or heterocyclic dicarboxylic acid, an ester or an anhydride thereof, by a one-step method or a two-step method.
- Such manufacturing methods are described in a number of U.S. patent specifications, e.g., U.S. Pat. No. 26,065, U.S. Pat. Nos.
- a reaction formula for forming a polybenzoimidazole by a condensation reaction between the aromatic tetraamine (I) and the aromatic, aliphatic or heterocyclic dicarboxylic acid, its ester or anhydride (II) is, for example, as follows: As shown.
- Ar is a tetravalent aromatic group, and each of the four amino groups is a pair of two, Each is bonded to the ortho position of the aromatic nucleus,
- Ar ' is a divalent aromatic, alkylene or heterocyclic group
- ⁇ represents a hydrogen atom, an aryl group, preferably a phenyl group, or an alkyl group, and 95% or less of ⁇ is a hydrogen or phenyl group.
- the aromatic tetraamine (1) and the dicarboxylic acid compound (II) can be used as a mixture of two or more compounds.
- aromatic tetraamine (I) examples include those represented by the following formula:
- X an 0-, - S-, one S0 2 -, or a CH 2 -, - (CH 2 - or - C (CH 3) 2 - represents a lower alkylene group such as).
- the preferred aromatic tetraamine is 3,3 ', 4,4'-tetraaminobiphenyl.
- the dicarboxylic acid component may be (a) a mixture of the free acid and at least one diester and / or Z or monoester, (mouth) a mixture of diester and / or monoester, or (c) a single dialkyl ester or monoester.
- mixed key Reel can be composed of monoalkyl or alkyl / alkyl esters, but all can be composed of free acids or diphenyl esters.
- Y is alkyl
- Y is preferably an alkyl group containing from 1 to 5 carbon atoms, and is preferably a methyl group.
- Y is an aryl group
- Y is an aromatic or alkylene group substituted or unsubstituted with any inert monovalent group such as alkyl or alkoxy containing 1 to 5 carbon atoms. Or a heterocyclic group. Except for one of the aromatic groups, it can be any monovalent aromatic group obtained by saturating all valences with hydrogen.
- Specific examples of the aryl group include phenyl, naphthyl, three kinds of phenyl groups and three kinds of tolyl groups.
- a preferred aryl group is a phenyl group.
- Suitable dicarboxylic acids of the dicarboxylic acids used in the above-mentioned production method include (a) aromatic dicarboxylic acids, (mouth) aliphatic dicarboxylic acids, preferably aliphatic dicarboxylic acids having 4 to 8 carbon atoms, and (C) There are heterocyclic dicarboxylic acids in which the carboxyl group is a substituent on a carbon atom in cyclic compounds such as pyridine, pyrazine, furan, quinoline, thiophene, and pyran.
- the dicarboxylic acids that can be used as free acids or esters as described above are, for example, the aromatic dicarboxylic acids shown below.
- dicarboxylic acid compound examples include the following. That is, isophthalic acid, terephthalic acid, 4,4'-biphenyldicarboxylic acid; 1,4-naphthylenedicarboxylic acid, diphenic acid (2,2'-biphenyldicarboxylic acid), phenylindane Dicarboxylic acid, 1,6-naphthylenedicarboxylic acid, 2,6-naphthylenedicarboxylic acid, 4,4'-diphenyl-terdicarboxylic acid, or 4,4'-diphenylthioether dicarboxylic acid .
- isophthalic acid is the most preferred dicarboxylic acid to be used as a free acid or ester in the process for producing the polybenzoimidazole used in the present invention.
- the dicarboxylic acid component can be used in a ratio of about 1 mole of the total dicarboxylic acid component per mole of the aromatic tetraamine.
- the optimal ratio of reactants in a particular polymerization system can be readily determined by one of ordinary skill in the art.
- polybenzimidazoles that can be prepared by the above method include the following. That is,
- Poly-2,2 ' (Frylene-2' ', 5' ') —5,5' —Bibenzimidazole,
- Preferred polymers include poly-1,2 '-(m-phenylene) -1,5'-bibenzoimidazole.
- Polybenzimidazoles suitable for use in the wafer retaining ring of the present invention can be specified by their intrinsic viscosity.
- the intrinsic viscosity of the polybenzimidazole suitable for the present invention is from 0.2 to 2.0, preferably from 0.6 to 1.1.
- polyimidazoles have good chemical resistance, abrasion resistance, high compressive strength, and retain their properties even at high temperatures. Due to this property, molded products of polybenzimidazole are usually limited in their use due to their processing limits, but it is also possible to mix polyarylene ketones for easier processing. Polyarylene ketones, although generally inferior to polybenzimidazoles, have good chemical resistance, compressive strength, and mechanical properties, and are more affordable than polybenzimidazoles Therefore, the cost can be reduced by using it as a component of the resin composition. However, when mixing the polybenzoimidazole with the polyalkylene ketone, it is preferable to mix the polybenzimidazole within a range that does not impair the above-mentioned properties possessed by the polybenzimidazole.
- the polyarylene ketone used in the present invention is, for example, one represented by the following general formula.
- PEEK polyester ether ketone
- PEEK is a crystalline thermoplastic resin having properties similar to polyether ketones.
- Polyarylene ketones useful in the practice of the present invention are polyester ketones or polyester ether ketones.
- the resin composition used in the wafer-holding ring in the present invention contains at least 30% by weight or more of polybenzimidazole, but preferably 50% or more. It is also possible to mix polyarylene ketone for the purpose of improving processability. At this time, mixing is possible within a range that does not impair the properties of the polybenzoimidazole, but is preferably 70% by weight or less, more preferably 50% by weight or less.
- the resin composition used for the wafer-holding ring in the present invention may further contain other resins.
- resins include polyimide, polyamide imide, polyvinyl chloride, polyacetal, polyphenylene sulfide, polyethylene terephthalate, polyether sulfone, polysulfone, polyphenylene oxide, polyarylate, and epoxy. Glass etc. No. These resin materials should be used within a range that does not impair the effects of the present invention.
- the resin composition used for the wafer holding ring in the present invention may contain a filler in order to improve abrasion resistance and strength.
- the filler used in the present invention is not particularly limited as long as the above-mentioned object can be achieved, but is preferably glass fiber, carbon fiber, graphite, boron nitride, carbon black, titanium oxide. Or silicon oxide.
- the mixing ratio of the filler is preferably 40% by weight or less, more preferably 30% by weight or less.
- the resin composition has a low impurity metal content so as not to contaminate the wafer in the CMP step.
- impurity metal refers to a substance that is present in a wafer and impairs its performance, although it depends on the type of wafer to be polished, and is in any form of ions, salts, and simple substances. Such impurity metals include iron, copper, chromium, nickel, sodium, potassium, calcium, magnesium, lithium and the like.
- the impurity metal content of the resin composition used in the wafer-holding ring of the present invention is preferably 10 O pm or less, more preferably 10 O pm or less.
- the impurity metal may be removed from each component of the resin composition, or the impurity metal may be removed from the entire resin composition.
- the method for removing impurity metals from polybenzimidazole which is the main component of the resin composition used in the present invention, is not particularly limited. For example, a method for separating impurity metal present in a fine powder state by filtration, A method for removing metal impurities from polybenzimidazole in a state using static electricity or magnetism, a method for treating a solution or dispersion of polybenzimidazole with a cation exchange resin, and a method using a metal chelating agent.
- Examples of the method include a method of separating an impurity metal, and a method of separating an impurity metal into a salt soluble in water or a lower alcohol, which is a poor solvent for polybenzoimidazole, with an acid. These methods are also described in Japanese Patent Application Laid-Open No. Hei 9-1990.
- the method of removing the impurity metal from the resin component or the method of removing the impurity metal from the resin composition containing the polybenzimidazole is also selected from the above-described methods of removing the impurity metal from the polybenzimidazole. Can be.
- the polybenzimidazole preferably used for the wafer holding ring of the present invention is a poly (12, '-(m-phenylene) -15,5'-bibenzoimidazole represented by the following structural formula (VIII). It is.
- the polyarylene ketone preferably used is the polyetherethergeton represented by the structural formula (V).
- the polybenzoimidazole resin composition used in the present invention has excellent heat resistance, chemical resistance, radiation resistance, etc., as well as abrasion resistance, and is used for CMP equipment exposed to a polishing pad. It is a very suitable material for the wafer retaining ring.
- the wafer holding ring of the present invention has at least a surface of a portion of the wafer holding ring that can come into contact with a wafer, made of a resin composition containing at least 30% by weight or more of polybenzoimidazole. .
- the surface layer is formed at least in a portion that may come into contact with the wafer. Also, the wafer holding If the thickness of the polishing pad is equal to or greater than the thickness of the wafer, the polishing pad may come into contact with the wafer-retaining ring.In this case, the polishing pad may come into contact with the polishing pad of the wafer-retaining ring. It is preferable to provide a surface layer made of a resin composition also on the surface of the portion.
- FIG. 2A is a schematic diagram of a cross-sectional structure of a core material 7 in which a surface layer 6 made of a resin composition is formed only on a surface of the core material 7 that can come into contact with the wafer 1.
- FIG. 7 is a schematic diagram of a cross-sectional structure of a surface layer 6 made of a resin composition formed on a surface capable of contacting a wafer and a surface capable of contacting a polishing pad
- FIG. 2D is a schematic diagram of a cross-sectional structure of a structure in which the entire surface of the wafer is covered with a surface layer 6 made of a resin composition
- the wafer cannot contact the entire inner surface of the wafer holding ring. In this case, it is sufficient that only the portion near the polishing pad inside the wafer holding ring is covered with the resin composition.
- the cross section of such a wafer-retaining ring is as illustrated in FIGS. 2 (e) to 2 (g).
- a hard material or a soft material conventionally used can be used for the core material.
- a hard material or a soft material conventionally used can be used for the core material.
- the surface layer may be formed only on the surface in contact with the wafer and the surface in contact with the polishing pad, or may be formed on the entire surface of the core material.
- the method of forming the surface resin layer is not particularly limited, but the surface resin layer can be formed by dissolving the polybenzoimidazole resin composition in a solvent, applying the solution on the surface of the wafer-holding ring, and then heating. When a solvent-insoluble filler is added to the resin composition, it is preferable to mix the resin composition as a dispersant.
- the thickness of the surface layer is preferably 50 m or more, and preferably 100 zm or more in order to ensure sufficient abrasion resistance, oxidation resistance and hydrolysis resistance of the wafer retaining ring. Is more preferred.
- the powder of the polybenzoimidazole resin composition is sintered and molded into a desired shape, or the polybenzoimidazole resin composition
- the object can be formed by pelletizing and molding into a desired shape by an injection molding method.
- Such a method of molding a polybenzo midazole mixture is disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 3-411150, Japanese Patent Application Laid-Open No. 2-296384, and the like. Molding can be performed in the same manner as described above.
- the abrasion resistance of the material used for the CMP ring was evaluated.
- a columnar material of ⁇ 11.3 thigh ⁇ 10 thigh which was made of the following materials a to h, was prepared.
- a projection having a thickness of 500 to 800 m is provided on one of the flat surfaces of the columnar material, and the projection is brought into contact with a mating material immersed in the slurry, and is rotated while applying a load.
- the amount of wear was measured.
- the amount of wear was evaluated based on the decrease in height of the protrusion (m) and the decrease in center cross-sectional area of the protrusion (/ m 2 ). The cross-sectional shape after wear was also observed.
- test conditions were as follows.
- polybenzoimidazoles of a. And b. Have the general formula (VIII) described above.
- Test material SS25 W2000 SS25 2000 Cross-sectional shape a 42 117 109 333 193939 A b 6 69 223000 295000 AB c 127 116 322 344 477 247 B d 679 648 1827636 1738210 C e 57 64 1122440 1407161 B f 767 684 2078273 1977000 Cg 637 637 1556363 1335400 C h 0 27 69000 81000 A
- the cross-sectional shape after abrasion was evaluated according to the following criteria.
- A The edges of the projections are mostly maintained or slightly rounded.
- B There is a tendency that the projection and its inner periphery are worn.
- the abrasion resistance of the resin composition containing the polybenzoimidazole is superior to the resin material conventionally used as the material of the wafer holding ring. Its abrasion resistance is second only to alumina, and since it is a resin composition, it does not contaminate the wafer with metal and does not damage the outer edge of the wafer. Also, regarding the cross-sectional shape after abrasion, it can be seen that the wafer holding ring of the present invention has a small shape change due to abrasion. Such characteristics are effective in reducing the frequency of replacement due to shape changes when used in a CMP device.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/398,600 US6896602B2 (en) | 2001-08-03 | 2002-05-08 | Wafer holding ring for chemical and mechanical polisher |
| KR1020037004693A KR100847428B1 (ko) | 2001-08-03 | 2002-08-05 | 화학적 기계적 연마장치용 웨이퍼 유지 링 |
| EP02753233A EP1418614A4 (en) | 2001-08-03 | 2002-08-05 | WAFER BRACKET FOR A CHEMICAL AND MECHANICAL POLISHER |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001-236783 | 2001-08-03 | ||
| JP2001236783A JP2003048155A (ja) | 2001-08-03 | 2001-08-03 | 化学的機械的研磨装置用ウェハー保持リング |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003015147A1 true WO2003015147A1 (en) | 2003-02-20 |
Family
ID=19067991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2002/007973 Ceased WO2003015147A1 (en) | 2001-08-03 | 2002-08-05 | Wafer holding ring for chemical and mechanical polisher |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6896602B2 (ja) |
| EP (1) | EP1418614A4 (ja) |
| JP (1) | JP2003048155A (ja) |
| KR (1) | KR100847428B1 (ja) |
| CN (1) | CN100341118C (ja) |
| TW (1) | TW541228B (ja) |
| WO (1) | WO2003015147A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005049274A3 (en) * | 2003-11-13 | 2005-11-03 | Applied Materials Inc | Retaining ring with shaped surface |
| US11260500B2 (en) | 2003-11-13 | 2022-03-01 | Applied Materials, Inc. | Retaining ring with shaped surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7086939B2 (en) * | 2004-03-19 | 2006-08-08 | Saint-Gobain Performance Plastics Corporation | Chemical mechanical polishing retaining ring with integral polymer backing |
| US7485028B2 (en) | 2004-03-19 | 2009-02-03 | Saint-Gobain Performance Plastics Corporation | Chemical mechanical polishing retaining ring, apparatuses and methods incorporating same |
| DE102004018249B3 (de) * | 2004-04-15 | 2006-03-16 | Infineon Technologies Ag | Verfahren zum Bearbeiten eines Werkstücks an einem Werkstückträger |
| WO2007144963A1 (ja) * | 2006-06-13 | 2007-12-21 | Polyplastics Co., Ltd. | 熱可塑性樹脂組成物 |
| JP2008023603A (ja) * | 2006-07-18 | 2008-02-07 | Nippon Seimitsu Denshi Co Ltd | 2層構造のリテーナリング |
| SG151129A1 (en) * | 2007-09-26 | 2009-04-30 | E Sun Prec Ind Co Ltd | Container for reticle |
| JP5464820B2 (ja) | 2007-10-29 | 2014-04-09 | 株式会社荏原製作所 | 研磨装置 |
| CN102017532A (zh) * | 2008-12-01 | 2011-04-13 | 马维尔国际贸易有限公司 | 接入点增强 |
| KR101160266B1 (ko) * | 2009-10-07 | 2012-06-27 | 주식회사 엘지실트론 | 웨이퍼 지지 부재, 그 제조방법 및 이를 포함하는 웨이퍼 연마 유닛 |
| US9679783B2 (en) | 2011-08-11 | 2017-06-13 | Taiwan Semiconductor Manufacturing Company, Ltd. | Molding wafer chamber |
| CN103506940B (zh) * | 2013-09-26 | 2017-01-04 | 中国电子科技集团公司第四十五研究所 | 化学机械抛光晶圆承载器 |
| CN107717639A (zh) * | 2017-11-09 | 2018-02-23 | 宁波江丰电子材料股份有限公司 | 控制保持环平面度的方法及生产的保持环、半导体制作系统 |
| KR102144846B1 (ko) * | 2018-08-27 | 2020-08-14 | 주식회사 케이씨텍 | 기판 처리 장치 및 이에 사용되는 리테이너 |
| KR102771908B1 (ko) * | 2020-02-28 | 2025-02-26 | 삼성전자주식회사 | 기판 처리 장치 |
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- 2001-08-03 JP JP2001236783A patent/JP2003048155A/ja active Pending
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2002
- 2002-05-08 US US10/398,600 patent/US6896602B2/en not_active Expired - Fee Related
- 2002-08-01 TW TW091117332A patent/TW541228B/zh not_active IP Right Cessation
- 2002-08-05 KR KR1020037004693A patent/KR100847428B1/ko not_active Expired - Fee Related
- 2002-08-05 WO PCT/JP2002/007973 patent/WO2003015147A1/ja not_active Ceased
- 2002-08-05 CN CNB028116194A patent/CN100341118C/zh not_active Expired - Fee Related
- 2002-08-05 EP EP02753233A patent/EP1418614A4/en not_active Withdrawn
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| US5704494A (en) * | 1995-06-16 | 1998-01-06 | Nihon Plast Co., Ltd. | Disc holder |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005049274A3 (en) * | 2003-11-13 | 2005-11-03 | Applied Materials Inc | Retaining ring with shaped surface |
| US7344434B2 (en) | 2003-11-13 | 2008-03-18 | Applied Materials, Inc. | Retaining ring with shaped surface |
| US7927190B2 (en) | 2003-11-13 | 2011-04-19 | Applied Materials, Inc. | Retaining ring with shaped surface |
| US8585468B2 (en) | 2003-11-13 | 2013-11-19 | Applied Materials, Inc. | Retaining ring with shaped surface |
| EP2883656A1 (en) * | 2003-11-13 | 2015-06-17 | Applied Materials, Inc. | Retaining ring with frustoconical bottom surface |
| US9186773B2 (en) | 2003-11-13 | 2015-11-17 | Applied Materials, Inc. | Retaining ring with shaped surface |
| US9937601B2 (en) | 2003-11-13 | 2018-04-10 | Applied Materials, Inc. | Retaining ring with Shaped Surface |
| US10766117B2 (en) | 2003-11-13 | 2020-09-08 | Applied Materials, Inc. | Retaining ring with shaped surface |
| US11260500B2 (en) | 2003-11-13 | 2022-03-01 | Applied Materials, Inc. | Retaining ring with shaped surface |
| US11577361B2 (en) | 2003-11-13 | 2023-02-14 | Applied Materials, Inc. | Retaining ring with shaped surface and method of forming |
| US11850703B2 (en) | 2003-11-13 | 2023-12-26 | Applied Materials, Inc. | Method of forming retaining ring with shaped surface |
Also Published As
| Publication number | Publication date |
|---|---|
| US6896602B2 (en) | 2005-05-24 |
| KR100847428B1 (ko) | 2008-07-21 |
| TW541228B (en) | 2003-07-11 |
| EP1418614A4 (en) | 2005-01-12 |
| JP2003048155A (ja) | 2003-02-18 |
| EP1418614A1 (en) | 2004-05-12 |
| KR20040028643A (ko) | 2004-04-03 |
| CN100341118C (zh) | 2007-10-03 |
| US20040023609A1 (en) | 2004-02-05 |
| CN1515027A (zh) | 2004-07-21 |
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