Process for preparing citral
CA 2050906 C · Owner: Rhone-Poulenc Biochimie · Inventors: Chabardes, Pierre; Chazal, Jacques
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
his invention involves an improved procedure for preparing liquid phase citral from prenol and prenal in which in the same reaction container, the prenal and prenol are condensed in the presence of a mineral acid to a concentration of about 5.10-3 mole for one mole of prenal; 90 to 90% of the acid introduced is neutralized and after the excess prenal and prenol have been removed the citral is distilled.
Read the whole patent
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 28, 1990 and granted August 26, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 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
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.