Process for a passivating postrinsing of phosphate layers
CA 2018631 C · Owner: Kolberg, Thomas · Inventors: Kolberg, Thomas; Gehmecker, Horst; Hauffe, Dieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process for a passivating postrinsing of phosphate layers on metals before the application of a paint or adhesive, aqueous solutions are employed which have been adjusted to a pH value of 3 to 5 and which contain an aluminum fluorozirconate in which the Al:Zr:F mole ratio is (0.15 to 0.65):1:(5 to 7), and in which solutions the total concentration of Al + Zr + F is 0.1 to 2.0 g/l preferably, 0.2 to 0.8 g/l. the postrinsing solutions may additionally contain at least one of the anions benzoate caprylate, ethyl hexoate, salicylate in a total concentration of 0.05 to 0.5 g/l and may preferably be adjusted to the required pH value with cations of volatile bases, such as ammonium …
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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 June 8, 1990 and granted May 11, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2012.
- 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.