US4645561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal-polishing composition and process
Assignee: QUANTEGY RECORDING SOLUTIONS LLC
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Filing: 1986-01-06
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Granted: 1987-02-24
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Expires: 2006-01-06
Abstract
Abstract The working surfaces of nickel-coated substrates for rigid magnetic discs are polished in a single-step process that employs a polishing composition comprising an aqueous suspension of unlubricated aluminum oxide powder having a hexagonal crystal shape and a nominal particle size of 1 to 10 microns, and colloidal aluminum oxide.
Inventors
- 👤 William V. Rea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:00
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C09K3/1454; C09K3/1463
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
40 words
A composition for polishing a metal surface comprising an aqueous suspension of: (a) unlubricated aluminum oxide powder having a hexagonal crystal shape and a nominal particle size in the range of 1 to 10 microns; and (b) colloidal aluminum oxide.
Claim 2
Dependent Claim
40 words
A composition for polishing a metal surface comprising an aqueous suspension of: (a) unlubricated aluminum oxide powder having a hexagonal crystal shape and a nominal particle size in the range of 1 to 10 microns; and (b) colloidal aluminum oxide.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein the metal surface is the surface of a nickel- or nickel alloy-coated substrate for a rigid magnetic disc.
Claim 4
Dependent Claim
59 words
The composition of claim 2 wherein the concentration of aluminum oxide powder in the suspension is about 1% to about 5% by volume and the concentration of colloidal aluminum oxide in the suspension is about 5% to 10% by volume, and the nominal particle size of the aluminum oxide powder is in the range of 3 to 5 microns.
Claim 5
Dependent Claim
59 words
The composition of claim 1 wherein the concentration of aluminum oxide powder in the suspension is about 2% to 4% by volume and the concentration of colloidal aluminum oxide in the suspension is about 6% to about 8% by volume, and the nominal particle size of the aluminum oxide powder is in the range of 3 to 5 microns.
Claim 6
Dependent Claim
14 words
The composition of claim 1 wherein the aqueous suspension also contains a suspending agent.
Claim 7
Dependent Claim
14 words
The composition of claim 4 wherein the aqueous suspension also contain a suspending agent.
Claim 8
Dependent Claim
24 words
A process for polishing a metal surface comprising: (a) mechanically rubbing the surface while (b) contacting the surface with the composition of claim 1.
Claim 9
Dependent Claim
33 words
A process for polishing a surface of a nickel- or nickel alloy-coated rigid magnetic disc substrate comprising: (a) mechanically rubbing the surface while (b) contacting the surface with the composition of claim 3.
Claim 10
Dependent Claim
33 words
A process for polishing a surface of a nickel- or nickel alloy-coated rigid magnetic disc substrate comprising: (a) mechanically rubbing the surface while (b) contacting the surface with the composition of claim 4.
Claim 11
Dependent Claim
33 words
A process for polishing a surface of a nickel- or nickel alloy-coated rigid magnetic disc substrate comprising: (a) mechanically rubbing the surface while (b) contacting the surface with the composition of claim 5.
Claim 12
Dependent Claim
33 words
A process for polishing a surface of a nickel- or nickel alloy-coated rigid magnetic disc substrate comprising: (a) mechanically rubbing the surface while (b) contacting the surface with the composition of claim 6.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |