US4525759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum storage disc
Assignee: Shipley Co Inc
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Filing: 1984-04-02
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Granted: 1985-06-25
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Expires: 2004-04-02
Abstract
Abstract A process for the metal plating of aluminum comprising the steps of electrolytically anodizing the surface of the aluminum, immersing the anodized aluminum into an electrolytic plating solution and initiating deposition by passing a current through the solution for a time sufficient to form a layer of metal over the aluminum. The process is especially useful for the formation of aluminum storage discs where the electrolytic metal is a single layer of a ferromagnetic metal.
Inventors
- 👤 Silvester P. Valayil
- 👤 Vita Aronson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; Y; Y10; Y10S; Y10S205/00; Y10S205/922; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/928; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12736; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12854
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A metal plated aluminum storage disc comprising an aluminum storage disc substrate, an electrically anodized oxide layer over at least a surface of said aluminum storage disc substrate, said anodized oxide layer having cracks propogating throughout its surface which cracks define discrete oxide islands separated from each other by said cracks, and a layer of electrolytically deposited ferromagnetic metal over said discrete oxide islands, said ferromagnetic metal being columnar in structure conforming in size and shape to said oxide islands and extending upwards from said islands.
Claim 2
Dependent Claim
86 words
A metal plated aluminum storage disc comprising an aluminum storage disc substrate, an electrically anodized oxide layer over at least a surface of said aluminum storage disc substrate, said anodized oxide layer having cracks propogating throughout its surface which cracks define discrete oxide islands separated from each other by said cracks, and a layer of electrolytically deposited ferromagnetic metal over said discrete oxide islands, said ferromagnetic metal being columnar in structure conforming in size and shape to said oxide islands and extending upwards from said islands.
Claim 3
Dependent Claim
26 words
The aluminum storage disk of claim 1 where the anodized oxide layer is formed at a current density of at least 8 amps per square foot.
Claim 4
Dependent Claim
40 words
The aluminum storage disk of claim 2 where the electrolyte is a sulfuric acid solution in a concentration of from ten to forty percent by volume and the current density varies between about 12 and 20 amps per square foot.
Claim 5
Dependent Claim
18 words
The aluminum storage disc of claim 2 characterized by the ferromagnetic metal layer being a single metal layer.
Claim 6
Dependent Claim
21 words
The aluminum storage disc of claim 2 where the metal layer is selected from the group of cobalt and colbalt-nickel alloys.
Claim 7
Dependent Claim
13 words
The aluminum storage disc of claim 5 where the metal layer is cobalt.
Claim 8
Dependent Claim
12 words
The aluminum storage disc of claim 5 overcoated with a second metal.
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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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |