Zinc coated steel plates coated with a pre-lubricating hydroxysulphate layer and methods for obtaining same
CA 2343016 C · Owner: Petitjean, Jacques · Inventors: Bello, Alain; Wajda, Sylviane; Rossi, Armand
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a steel plate coated with a metal layer based on zinc and a zinc hydroxysulphate layer whereof the surface density of sulphur is more than 0.5 mg/m?2¿. The invention also concerns a method for obtaining said plate by treating a zinc coated sheet metal: either in a highly alkaline sulphate solution under polarisation: or in a sulphate solution containing Zn?2+¿ ions without polarisation. The hydroxysulphate deposit brings about a pre-lubricating effect applicable to operations for forming sheet metal.
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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 9, 1999 and granted June 28, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 9, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 9, 2021.
- 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.