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US3634208A
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Coloring method of aluminum anodic oxide coating film
Assignee: Aiden KK
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Filing: 1969-09-25
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Granted: 1972-01-11
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Expires: 1989-09-25
Abstract
Abstract Alumite is colored by first subjecting same to an alternating current electrolyzing treatment in an electrolyte followed by a direct current electrolyzing treatment in a coloring solution in which the alumite is the cathode.
Inventors
- 👤 Koichi Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:59
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/20; C25D11/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
27 words
A method as claimed in claim 1 wherein the direct current electrolyzing treatment is effected for about 2 minutes at a current density of about 0.6 A/dm.2.
Claim 2
Dependent Claim
14 words
A method as claimed in claim 1 wherein the electrolytic solution is sulfuric acid.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1 wherein the electrolyte containing color producing metallic ions comprises KAu(CN)2, citric acid and sodium citrate.
Claim 4
Dependent Claim
27 words
A method as claimed in claim 1 wherein the alternating current electrolyzing treatment is effected for about 2 minutes at a current density of about 1.5 A/dm.2.
Claim 5
Dependent Claim
27 words
A method as claimed in claim 5 wherein the direct current electrolyzing treatment is effected for about 2 minutes at a current density of about 0.6 A/dm.2.
Claim 6
Dependent Claim
21 words
A method as claimed in claim 1 wherein the electrolyte containing color producing metallic ions comprises NiSO4, boric acid and NH4CL.
Claim 7
Dependent Claim
11 words
The product produced by the method as claimed in claim 7.
Claim 8
Dependent Claim
38 words
A method as claimed in claim 1 wherein the anodic aluminum oxide is prepared by an oxidizing aluminum in a bath which is the same as the electrolytic solution in which the alternating current electrolyzing treatment is effected.
Claim 9
Dependent Claim
13 words
A method as claimed in claim 9 wherein the bath is sulfuric acid.
Claim 10
Dependent Claim
11 words
The product produced by the method as claimed in claim 10.
References Cited (Backward Citations)
US3382160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |