Zinciferous coated steel sheet and method for producing the same
CA 2232279 C · Owner: Sukarai, Michitaka · Inventors: Nomura, Syuji; Inagaki, Junichi; Imokawa, Toru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A zinciferous coated steel sheet comprises a steel sheet a zinciferous coating layer formed on the steel sheet a Fe-Ni-Zn-O, film formed on the zinciferous coating layer and an oxide layer, formed on a surface portion of the Fe-Ni-Zn-O film. The method comprises providing an electrolyte of an acidic sulfate aqueous solution, carrying out an electrolysis treatment in the electrolyte under a current density ranging from 1 to 150 A/dm2 and carrying out an, oxidation treatment to a surface of the zinciferous coated steel sheet.
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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
- Filed March 18, 1998 and granted September 11, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 18, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 18, 2020.
- 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.