Electrolytically treating anodized aluminum in sulfuric acid and electrolytically colouring
CA 1212351 A · Owner: Ronain, S.A. · Inventors: Martinez, Dionisio Rodriguez
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrolytic coloring process for anodised aluminum or aluminum alloy is disclosed in which the aluminum is subjected to electrolytic treatment, in the absence of metal salts, in a low dissolution electrolyte having a chemical activity equivalent to an H2SO4 concentration of less than 4gm/litre, by applying an alternating current having a peak voltage of between 55 and 85 volts and a current density of less than 0.3 amp/dm2 and then treating the aluminum in an acid electrolyte containing a metal salt, again using alternating current of the same peak voltage range.
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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 October 7, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 7, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
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.