Patent US5366542A successfully refreshed from Google Patents.
US5366542A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polishing composition
Assignee: Mitsubishi Chemical Corp
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Filing: 1992-12-07
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Granted: 1994-11-22
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Expires: 2012-12-07
Abstract
Abstract The present invention relates to a polishing composition comprising water, alumina, and a chelating agent. It may optionally be incorporated with an aluminum salt and/or boehmite. The present composition permits efficient polishing and gives a polished surface having superior surface properties. The composition is suitable for polishing a memory hard disk.
Inventors
- 👤 Tsutomu Yamada
- 👤 Taizo Okajima
- 👤 Kouichi Ootani
- 👤 Hitoshi Morinaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:17
CPC Classifications
C; C09; C09G; C09G1/00; C09G1/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
55 words
A polishing composition comprising water, alumina as abrasive particles, and a chelating agent, wherein the alumina is present in an amount of from 2 to 30% by weight, based on the total amount of the composition and the chelating agent is selected from the group consisting of polyaminocarboxylic acid, and sodium and potassium salt thereof.
Claim 2
Dependent Claim
55 words
A polishing composition comprising water, alumina as abrasive particles, and a chelating agent, wherein the alumina is present in an amount of from 2 to 30% by weight, based on the total amount of the composition and the chelating agent is selected from the group consisting of polyaminocarboxylic acid, and sodium and potassium salt thereof.
Claim 3
Dependent Claim
12 words
The composition according to claim 1, which further contains an aluminum salt.
Claim 4
Dependent Claim
10 words
The composition according to claim 1, which further contains boehmite.
Claim 5
Dependent Claim
10 words
The composition according to claim 2, which further contains boehmite.
Claim 6
Dependent Claim
30 words
The composition according to claim 1, wherein the chelating agent is present in an amount of from 0.01 to 20% by weight, based on the total amount of the composition.
Claim 7
Dependent Claim
30 words
The composition according to claim 2, wherein the aluminum salt is present in an amount of from 0.01 to 20% by weight based on the total amount of the composition.
Claim 8
Dependent Claim
31 words
The composition according to claim 3 or 4, wherein the boehmite is present in an amount of from 0.1 to 20% by weight, based on the total amount of the composition.
Claim 9
Dependent Claim
13 words
The composition according to claim 1, wherein the polyaminocarboxylic acid is ethylenediaminetetraacetic acid.
Claim 10
Dependent Claim
13 words
The composition according to claim 1, wherein the polyaminocaboxylic acid is diethylenetriaminepentaacetic acid.
Claim 11
Dependent Claim
29 words
The composition according to claim 2, wherein the aluminum salt is selected from the group consisting of aluminum sulfate, aluminum chloride, aluminum nitrate, aluminum hydrogen phosphate and aluminum bromide.
Claim 12
Dependent Claim
29 words
The composition according to claim 1, wherein the alumina is present in an amount of from 2 to 15% by weight based on the total amount of the composition.
Claim 13
Dependent Claim
18 words
The composition according to claim 1, wherein the chelating agent is sodium or potassium salt of polyaminocarboxylic acid.
Claim 14
Dependent Claim
13 words
The composition according to claim 12, wherein the polyaminocarboxylic acid is ethylenediaminetetraacetic acid.
Claim 15
Dependent Claim
13 words
The composition according to claim 12, wherein the polyaminocarboxylic acid is diethylenetriaminepentaacetic acid.
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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) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |