Process for the production of granulated dicalcium phosphate dihydrate
CA 2036731 C · Owner: Stoffel, Erwin · Inventors: Merkenich, Karl; Stoffel, Erwin; Rau, Karl-Martin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for the production of granulated dicalcium phosphate dihydrate from fine-grained, powdered dicalcium phosphate dihydrate, wherein 80 to 95% of dicalcium phosphate dihydrate with a grain size of less than 120 µm. and 20 to 5% of calcium hydroxide with a grain size of less than 120 m. are dry mixed and continuously sprayed and granulated in a fluidised bed with 20 to 50% of water, referred to the amount of solids, in which is contained an amount of phosphoric acid sufficient for the neutralisation of the calcium hydroxide, the granulate obtained is dried at a temperature of 150 to 200°C. and the portions of coarse and fine grained material are …
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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 20, 1991 and granted May 6, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 20, 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.