Process for electrolytic colouring of the anodic oxide film on aluminum or aluminum base alloys
CA 1046975 A · Owner: Sumitomo Aluminium Smelting Company · Inventors: Tsukiyasu, Tadashi; Yanagida, Kiyomi; Hirokane, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the process of colouring an anodized aluminum or aluminum alloy article by subjecting the anodized article to an electrolytic treatment with a direct current in an aqueous electrolytic colouring bath containing a water-soluble metallic salt, the oxide film on the article can be easily coloured in a stable manner and in a uniform colour, by subjecting the anodized article previously to an anodic direct current electrolysis in an aqueous solution containing the same metallic ion as in the colouring bath, and then to a cathodic direct current electrolysis for colouring the anodized oxide film on the article.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 23, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 23, 1996.
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Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.