Process of producing phosphate coatings on metals
CA 1308629 C · Owner: Vey, Rudolf · Inventors: Oei, Han Yong; Vey, Rudolf; Siemund, Gunter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of producing phosphate coatings on metals having surfaces which consist at least in part of iron or steel. In the process the metals are contacted with a phosphatizing solution which is at a temperature in the range from 30 to 50° C and contains:, to 25 g/1 zinc 1 to 10 g/1 manganese, 0.1 to 13 g/1 iron (II) to 40 g/1 phosphate, (calculated as P2O5) to 50 g/1 nitrate, and which also contains: 0.5 to 5 g/1 fluoroborate, (calculated as BF4) 0.05 to 3 g/1 tartaric acid or, citric acid and which has been adjusted to weight ratios of Zn: P2O5 = (0.5 to 3) : 1 and of Mn : Zn = (0.04 to 0.5) : 1 and to a ratio of free acid to total acid of (0.04 to 0.2) : 1. The process is particularly …
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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
- Granted October 13, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 2009.
- 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.