Patent US5637028A successfully refreshed from Google Patents.
US5637028A
Expired / Lapsed
US
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Method of polishing a surface of a noble metal
Assignee: US Philips Corp
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Filing: 1994-03-16
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Granted: 1997-06-10
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Expires: 2014-03-16
Abstract
Abstract Method of polishing a surface (5a) of a noble metal or an alloy comprising mainly noble metal, in which a polishing means is moved across the surface while exerting a polishing pressure for obtaining a plane and smooth polished surface without any defects. A composition comprising demineralized water with 20 to 40% by weight of an organic liquid comprising a poly-alcohol or a derivative thereof, for example, glycerol, and particles which can be encapsulated and have a Knoop's hardness of between 5 and 50 GPa, for example Al 2 O 3 grains, is used as a polishing means.
Inventors
- 👤 Jan Haisma
- 👤 Cornelis L. Adema
- 👤 Lambertus Postma
- 👤 Mathijs P. H. Souts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:08
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3163; B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/16; C; C09; C09G; C09G1/00; C09G1/02; C09K; C09K3/00; C09K3/14; C09K3/1454; C09K3/1463; Y; Y10; Y10S; Y10S977/00; Y10S977/70; Y10S977/773; Y10S977/775; Y10S977/777; Y10S977/84; Y10S977/888
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
91 words
A method of polishing a surface of a noble metal or an alloy comprising mainly noble metal, comprising the steps of moving a polishing means and said surface with respect to each other while exerting a polishing pressure on the surface with the polishing means for obtaining a polished surface, characterized in that the polishing means comprises a composition comprising demineralized water with 20 to 40% by weight of an organic liquid comprising a poly-alcohol or a derivative thereof and particles having a Knoop's hardness of between 5 and 50 GPa.
Claim 2
Independent Claim
91 words
A method of polishing a surface of a noble metal or an alloy comprising mainly noble metal, comprising the steps of moving a polishing means and said surface with respect to each other while exerting a polishing pressure on the surface with the polishing means for obtaining a polished surface, characterized in that the polishing means comprises a composition comprising demineralized water with 20 to 40% by weight of an organic liquid comprising a poly-alcohol or a derivative thereof and particles having a Knoop's hardness of between 5 and 50 GPa.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1, characterized in that the particles have a grain size of the order of 50 nm.
Claim 4
Dependent Claim
18 words
A method as claimed in claim 1, characterized in that the particles comprise Al 2 O 3 .
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, characterized in that the particles comprise SnO 2 .
Claim 6
Dependent Claim
27 words
A method as claimed in claim 1, characterized in that the particles are present in the composition in the amount of from 0.1 to 1% by weight.
Claim 7
Dependent Claim
14 words
A method as claimed in claim 1, characterized in that the poly-alcohol comprises glycerol.
Claim 8
Dependent Claim
20 words
A method as claimed in claim 1, characterized in that a maximum polishing pressure of 150 g/cm 2 is used.
Claim 9
Dependent Claim
19 words
A method as claimed in claim 1, characterized in that the polishing means comprises means for absorbing the composition.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 8, characterized in that the absorbing means comprises a tissue of organic fibres.
Claim 11
Dependent Claim
33 words
A method as claimed in claim 1, characterized in that prior to polishing, a layer having a surface of the noble metal or alloy comprising mainly noble metal is formed on a substrate.
Claim 12
Dependent Claim
34 words
A method as claimed in claim 10, characterized in that subsequent to polishing a non-magnetic layer is deposited on the polished surface obtained, the non-magnetic layer forming a transducing gap of a magnetic head.
Claim 13
Dependent Claim
14 words
A method as claimed in claim 5, characterized in that the poly-alcohol comprises glycerol.
Claim 14
Dependent Claim
50 words
A polishing composition suitable for use in the method as claimed in claim 1, characterized by the presence of demineralised water with 20 to 40% by weight of an organic liquid comprising a poly-alcohol or a derivative thereof and particles having a Knoop's hardness of between 5 and 50 GPa.
Claim 15
Dependent Claim
23 words
A polishing composition as claimed in claim 13, characterized in that the particles have a grain size of the order of 50 nm.
Claim 16
Dependent Claim
34 words
A polishing composition as claimed in claim 13, characterized in that the particles comprise one or more of the members selected from the group consisting of Al 2 O 3 and SnO 2 .
Claim 17
Dependent Claim
25 words
A polishing composition as claimed in claim 13, characterized in that the particles are present in the amount of from 0.1 to 1% by weight.
Claim 18
Dependent Claim
15 words
A polishing means as claimed in claim 13, characterized in that the poly-alcohol comprises glycerol.
Claim 19
Dependent Claim
18 words
A method as claimed in claim 2, characterized in that the particles comprise Al 2 O 3 .
Claim 20
Dependent Claim
16 words
A method as claimed in claim 2, characterized in that the particles comprise SnO 2 .
Claim 21
Dependent Claim
27 words
A method as claimed in claim 2, characterized in that the particles are present in the composition in the amount of from 0.1 to 1% by weight.
Claim 22
Dependent Claim
27 words
A method as claimed in claim 3, characterized in that the particles are present in the composition in the amount of from 0.1 to 1% by weight.
Claim 23
Dependent Claim
27 words
A method as claimed in claim 4, characterized in that the particles are present in the composition in the amount of from 0.1 to 1% by weight.
Claim 24
Dependent Claim
14 words
A method as claimed in claim 2, characterized in that the poly-alcohol comprises glycerol.
Claim 25
Dependent Claim
14 words
A method as claimed in claim 3, characterized in that the poly-alcohol comprises glycerol.
Claim 26
Dependent Claim
14 words
A method as claimed in claim 4, characterized in that the poly-alcohol comprises glycerol.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-09 | 2000-12-09 | 2001-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-09 | 2004-12-09 | 2005-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-09 | 2008-12-09 | 2009-06-10 | $7700.00 | Window Closed / Lapsed |