Chemically producing anodic oxidation coat on al or al alloy
CA 1211405 A · Owner: Kabushiki Kaisha Chiyoda · Inventors: Toba, Shoji; Okubo, Keigo; Kumagai, Tokuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of enhancing the naturally developed colour of an anodic oxidation coat chemically produced on an Al alloy in which the coat is formed by electrolysis employing a warmed electrolyte of sulphuric acid and an alternating current the polarity of which is periodically reversed to be negative for a period of 10-20% of each cycle while being applied to the Al alloy dipped in the electrolyte as an anode for 20 to 40 minutes. The thus coated Al alloy is subjected to a heat treatment in a boiling sealing liquid for 20 minutes. During each negative polarity period of the current electrolytic reduction takes place on the Al alloy (which is acting as a cathode), whereby sulphur in the …
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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 16, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 16, 2003.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.