Patent US3849263A successfully refreshed from Google Patents.
US3849263A
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Process for electrolytically colouring of aluminium which has previously been anodically oxidized
Assignee: Individual
•
Filing: 1970-06-25
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Granted: 1974-11-19
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Expires: 1990-06-25
Abstract
Abstract Aluminum is coloured by passing an alternating current between a previously anodized workpiece and a counter electrode in an aqueous acid tin salt.
Inventors
- 👤 O Gedde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:55
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/20; C25D11/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
A PROCESS FOR ELECTROLYTICALLY COLORING AN ALUMINUM ARTICLE WHICH COMPRISES FIRST, ANODICALLY OXIDIZING SAID ARTICLE TO FORM AN ALUMINA LAYER THEREON; IMMERSING SAID ARTICLE IN AN AQUEOUS BATH COMPRISING A STRONG ACID AND A SOLUTION OF ABOUT 0.5 TO 20 PERCENT BY WEIGHT OF A DIVALENT TIN SALT, BASED ON SAID BATH, SAID TIN SALT BEING THE PREDOMINANT SOURCE OF METALS IONS IN SAID BATH CAPABLE OF FORMING AND DETERMINING THE COLOR OF THE COLORED COMPOUNDS IN SAID ALUMINA LAYER, AND PASSING AN ALTERNATING CURRENT BETWEEN SAID ANODICALLY OXIDIZED ARTICLE AND A COUNTER-ELECTRODE VIA SAID BATH TO DEVELOP SAID COLOR ON SAID ARTICLE.
Claim 2
Dependent Claim
103 words
A PROCESS FOR ELECTROLYTICALLY COLORING AN ALUMINUM ARTICLE WHICH COMPRISES FIRST, ANODICALLY OXIDIZING SAID ARTICLE TO FORM AN ALUMINA LAYER THEREON; IMMERSING SAID ARTICLE IN AN AQUEOUS BATH COMPRISING A STRONG ACID AND A SOLUTION OF ABOUT 0.5 TO 20 PERCENT BY WEIGHT OF A DIVALENT TIN SALT, BASED ON SAID BATH, SAID TIN SALT BEING THE PREDOMINANT SOURCE OF METALS IONS IN SAID BATH CAPABLE OF FORMING AND DETERMINING THE COLOR OF THE COLORED COMPOUNDS IN SAID ALUMINA LAYER, AND PASSING AN ALTERNATING CURRENT BETWEEN SAID ANODICALLY OXIDIZED ARTICLE AND A COUNTER-ELECTRODE VIA SAID BATH TO DEVELOP SAID COLOR ON SAID ARTICLE.
Claim 3
Dependent Claim
36 words
A process as claimed in claim 1, wherein said bath includes an aromatic sulfonic acid capable of complexing said tin in divalent form and selected from the group consisting of phenol sulfonic acids and sulfophthalic acid.
Claim 4
Dependent Claim
56 words
An electrolytic bath for the aluminum coloring process according to claim 1 comprising a solution of a stannous salt in a concentration of 1 percent to 20 percent by weight, based on said bath, as the predominent metallic coloring-component in a solution of a strong acid selected from the group consisting of sulfuric and hydrochloric acids.
Claim 5
Dependent Claim
14 words
The electrolytic bath according to claim 3 wherein said bath has the following composition:
Claim 6
Dependent Claim
22 words
The process according to claim 1 wherein the tin salt is selected from the group consisting of stannous chloride and stannous sulfate.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |