Phosphating method accelerated by n-oxides
CA 2300276 A1 · Owner: Speckmann, Horst-Dieter · Inventors: Brouwer, Jan-Willem; Willer, Annette; Kuhm, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an acidic aqueous phosphating solution containing , 0.2 to 3g/l zinc ions, 3 to 50g/l phosphate ions calculated as PO43-, and , 0.05 to 4 g/l of an organic N-oxide. The N-oxide is preferably chosen from the N-oxides of substituted or non-substituted pyridines and morpholines especially from pyridine-N-oxide, 2-methylpyridine-N-oxide 4-methylpyridine-N-, oxide, morpholine-N-oxide and N-methylmorpholine-N-oxide. The phosphating solution contains a co-accelerator; preferably chlorate hydrogen peroxide, nitroguanidine and/or m-nitrobenzol sulfonate.
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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 July 25, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 25, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 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
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.