Aqueous solution and method for phosphatizing metallic surfaces
CA 2325012 A1 · Owner: Chemetall Gmbh · Inventors: Deemer, Michael; Schubach, Peter; Fleischhacker-Jeworrek, Margit
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 aqueous solution containing phosphate for producing phosphate layers on metallic surfaces made of iron steel, zinc, zinc alloys, aluminum or aluminum alloys. Said solution contains 0.3 to 5 g Zn2+ /1, 0.1 to 2 g nitroguanidine/1 and 0.05 to 0.5 g hydroxylamine/1 whereby the S-value is between 0.03 and 0.3 and the ratio of the weight of , Zn2+ to P2O5 = 1:5 to 1:30. The invention also relates to a phosphatizing method in which the metallic surfaces are cleaned then treated with said , aqueous solution containing phosphate for a period of 5 seconds to 10 minutes at a temperature ranging from 15 to 70 ~C and finally, are rinsed with water.
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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 February 24, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 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
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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.