Method for coating surfaces of copper or of a copper alloy with a tin or tin alloy layer
CA 2326049 A1 · Owner: Mahlkow, Hartmut · Inventors: Backus, Petra; Mahlkow, Hartmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sufficiently good soldering results can not be obtained using known methods for tinning copper surfaces. In particular the surfaces remain incapable of , being soldered after thermal treatment. To eliminate this problem a method is , used for coating surfaces of copper or of a copper alloy with a layer made of tin or of a tin alloy. Said method comprises the essential following steps: a) treating the surfaces with a solution containing at least one noble metal compound in order to deposit noble metal; b) treating the surfaces which are coated with noble metal according to step a) with a solution containing at least one tin compound, at least one acid and at least one complexing agent …
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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 15, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 15, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 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.