High yields, high purity melamine manufacturing process
CA 2394815 A1 · Owner: Noe', Sergio · Inventors: Morello, Giovanni; Parmegiani, Massimo; Noe', Sergio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process to recover both melamine and oxyaminotriazines (OAT) from the mother liquors of melamine crystallisation comprising the following steps: a) addition to a melamine and OAT containing aqueous solution at high temperature of an alkaline agent until the solution pH reach a value equal or higher than 11; b) most of melamine crystallisation by solution cooling; c) separation and recovery of precipitated melamine; d) acidification of the obtained solution after precipitated melamine separation in order to reach a pH of about 7; e) the suspension obtained in d) above after precipitated melamine recovery is , subject to filtration according to tangential filtration technique …
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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 December 7, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 7, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 7, 2022.
- 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.