Highly corrosion-resistant, colored thin film-coated steel sheet having excellent press-processability and spot-weldability
CA 2013601 C · Owner: Kabeya, Motoo · Inventors: Shindou, Yoshio; Kabeya, Motoo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a highly corrosionresistant, colored thin film-coated steel sheet having excellent press-processability and spot-weldability which com-, prises a plated steel sheet a first layer of a sparingly, soluble chromate film formed on surface(s) of the plated steel sheet and having a water soluble content of 1 to 30% a Cr6+/Cr3+ ratio of 0.01 to 1.0 and a total chromium build-up of 10 to 150 mg/m2 on one surface and a second, layer of a 0.3 to 5 µ thick solid coating film formed of an organic solvent-type coating composition the solid, coating film being comprised based on the weight of the, nonvolatile content of, (a) a urethanated epoxy ester resin having a number average …
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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 2, 1990 and granted June 8, 1993. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 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
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.