Process of producing activating agents for use in zinc phosphating processes
CA 2040872 A1 · Owner: Jentsch, Dieter · Inventors: Rein, Rudiger; Jentsch, Dieter; Wittel, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a process of producing activating agents which are based on titanium (IV) phosphate and intended for use in the activation of metal surfaces before a zinc phosphating treatment under conditions ensuring a thorough mixing: a) one or more titanium (IV) compounds which are dissolved in water or acid are alkalinized with aqueous alkali b), thereafter orthophosphate is added thereto while an alkaline pH value is maintained, and c) the activating agent is stirred at a temperature in the range from 70 to 90°C and under a pressure between standard pressure and 300 bars for at least 15 minutes to bring the activating agent to maturity. Process steps a) and b) are carried out at a temperature …
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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 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 2013.
- 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.