Galvannealed steel sheet with distinguished anti-powdering and anti-flaking properties and process for producing the same
CA 2010898 C · Owner: Suemitsu, Yukimasa · Inventors: Kanamaru, Tatsuya; Nakayama, Motohiro; Numakura, Yukio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A galvannealed steel sheet having distinguished anti-powdering property and anti-flaking property is disclosed. The steel sheet comprises a matrix steel sheet and a galvannealed coating layer having a coating weight of 45 to 90 g/m2, composed of 8 ~ 12 wt.% Fe and 0.05 ~ 0.35 wt.%, preferably 0.05 ~ 0.30 wt.% Al the, balance being Zn, provided on at least one side of the matrix steel sheet, the galvannealed coating layer having a .GAMMA. phase with a thickness of not more than 1.3 µm preferably not more than 1.0 µm in the region at the boundary to the matrix steel sheet, and the surface region of galvannealed coating layer has a structure either (1) ? and ? phases do not exist 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
- Filed February 26, 1990 and granted July 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 2012.
- 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.