Method for phosphatizing a steel strip
CA 2303877 A1 · Owner: Riesop, Joerg · Inventors: Riesop, Joerg; Seidel, Reinhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for phosphatizing a steel strip or a zinccoated or galvanized steel strip by depositing an alloy on one or two surfaces, by spraying or immersion, for 2 to 20 seconds with an acid , phosphatizing solution, containing zinc magnesium and manganese, at a , temperature of the order of 50 to 70 ~C. Said method is characterised in that the phosphatizing solution does not contain nitrate ions and that it contains: between 1 and 4 g/l of zinc ions, between 1.2 and 4 g/l of manganese ions between 1 and 4 g/l of magnesium ions, between 10 and 30 g/l of phosphate ions, between 0.1 and 3 g/l of hydroxylamine in free ionic or combined form. , The acid content of said …
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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 September 5, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 5, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 5, 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
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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.