Electrogalvanized steel sheet having two electroplating layers and excellent in antifriction, corrosion resistance and painting finish
CA 2040632 A1 · Owner: Sagiyama, Masaru · Inventors: Ando, Satoru; Kawabe, Masaki; Sagiyama, Masaru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electrogalvanized steel sheet having two electroplating layers and excellent in antifriction corrosion resistance and painting finish comprising: a, steel sheet; a zinc electroplating layer formed on at least one surface of the steel sheet; and a zinc alloy electroplating layer formed on the zinc electroplating layer. The zinc electroplating layer has a center-line mean roughness (Ra) of up to 1.5 µm and a plating weight of from 25 to 150 g/m2 per surface of the steel sheet. The zinc alloy electroplating layer comprises zinc and at least one element selected from the group consisting of cobalt manganese, nickel, iron and chromium. The zinc alloy electroplating layer contains such at …
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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 April 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 2013.
- 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
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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.