Process for improving the formability and weldability properties of zinc coated steel sheet
CA 2175105 C · Owner: Wendell, Elmer J. · Inventors: Fountoulakis, Stravros G.; Wendell, Elmer J.; Shastry, C. Ramadeva
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A post plating or post coating method for improving formability and weldability properties in sheet steel product having a protective zinc or zinc alloy layer formed on at least one surface thereof. The steps of the method comprise immersing the sheet steel product into a bath containing at least zinc to apply the protective layer removing the sheet steel, product from the bath the sheet steel product having a protective zinc or zinc alloy layer formed on at least one surface thereof and applying an alkaline solution to the protective layer to form a zinc oxide layer thereon the alkaline solution being applied at a location outside the bath.
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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 26, 1996 and granted September 21, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 26, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 26, 2018.
- 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.