US3661729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coloring anodic coatings on aluminum and aluminum alloys with metal salts
Assignee: Individual
•
Filing: 1969-09-05
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Granted: 1972-05-09
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Expires: 1989-09-05
Abstract
Abstract Colored coatings are produced by first subjecting an aluminum or its alloys to anodic oxidation in an electrolyte containing mainly sulfuric acid, by supplying an electric current comprising a direct current component and an alternating current component with the alternating current component at least as large as the direct current component, dipping the oxide coating in an aqueous solution containing metallic cations or anions without supplying the electric current and then subjecting the coating to sealing treatment to produce coloring thereof.
Inventors
- 👤 Tadahito Miyakawa
- 👤 Kazuko Nagai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:23
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/54; C07D233/66; C07D233/91; C07D233/92; C07D233/94; A; A23; A23K; A23K20/00; A23K20/10; A23K20/116; A23K20/137
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
33 words
Process according to claim 1, wherein said solution comprises a combination of metal salts selected from the group consisting of (1) copper acetate-nickel chloride, (2) nickel chloride-zinc chloride, and (3) cobalt acetate-copper sulfate.
Claim 2
Dependent Claim
112 words
Process for coloring the surface of an aluminum based metal comprising the steps of a. anodizing said surface in an electrolyte containing mainly sulfuric acid by supplying an electric current comprising an AC component and a DC component and having the following ratio: b. dipping the resulting anodized surface in a solution containing a combination of metal salts selected from the group consisting of (1) copper acetate-nickel chloride, (2) nickel chloride-zinc chloride, and (3) cobalt acetate-copper sulfate, the concentration of said metal salts in said solution being within the range of from 0.1 percent by weight to 10 percent by weight; and c. sealing the dipped anodized surface to produce coloring thereof.
Claim 3
Dependent Claim
46 words
Process according to claim 3, wherein said treating step comprises subjecting the dipped anodized surface to high pressure of about 3.5 Kg./cm.2 or more of steam for a period of from 30 minutes to 60 minutes, whereby said coloring is produced and said surface is sealed.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |