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US3985629A
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Method for color-anodizing aluminum and aluminum alloys in a short period of time
Assignee: Toyo Chuo Kagaku Kenkyusho
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Filing: 1975-06-18
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Granted: 1976-10-12
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Expires: 1995-06-18
Abstract
Abstract A method for color-anodizing (hereinafter referred merely to "coloring") aluminum and aluminum alloys in a short period of time. The method comprises adding sulfosalicylic acid or sulfophthalic acid and along with sulfuric acid to a solution, of which the main ingredient is citric acid, succinic acid, to form an electrolyte and effecting anodic oxidation on surfaces of aluminum and aluminum alloys with the electrolyte to form a colored oxide coating.
Inventors
- 👤 Shozo Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:18
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A method for color-anodizing aluminum and aluminum alloys to form a colored oxide coating comprising subjecting the surfaces of said aluminum and aluminum alloys to anodic oxidation with D.C. current having a density of 0.5 - 2.0 A/dm 2 in an electrolyte which contains 5 to 100 g/lit of electrolyte of citric acid or succinic acid, 1 to 30 g/lit of electrolyte of sulfosalicylic acid or sulfophthalic acid and 1 to 5.0 ml/lit of electrolyte of sulfuric acid.
Claim 2
Independent Claim
78 words
A method for color-anodizing aluminum and aluminum alloys to form a colored oxide coating comprising subjecting the surfaces of said aluminum and aluminum alloys to anodic oxidation with D.C. current having a density of 0.5 - 2.0 A/dm 2 in an electrolyte which contains 5 to 100 g/lit of electrolyte of citric acid or succinic acid, 1 to 30 g/lit of electrolyte of sulfosalicylic acid or sulfophthalic acid and 1 to 5.0 ml/lit of electrolyte of sulfuric acid.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |