Method of forming coloured anodized coating on die-cast auminum alloy articles
CA 1193572 A · Owner: Kabushiki Kaisha Chiyoda · Inventors: Okubo, Keigo; Koike, Akio; Toba, Shoji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of chemically forming and colouring an anodized coating on die-cast Al alloys the chemical formation, and colouration of the anodized coating being performed simultaneously by applying to the alloy an alternating current the polarity of which is reversed to be negative for less than 14% of each cycle, in an electrolyte containing either inorganic or organic acid. The method also enables the chemically formed and coloured anodized coating to be variously coloured and further improved by dipping the coated object into a heated metallic salt solution or water.
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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 September 17, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 17, 2002.
- 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.