The purification of 2-methoxy-5-trifluoromethoxybenzaldehyde
CA 2476608 A1 · Owner: Watson, Timothy James Norman · Inventors: Vetelino, Michael Girard; Arpin, Patrice; Watson, Timothy James Norman
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the purification of 2-methoxy-5-trifluor-methoxy benzaldehyde oil in which the oil is converted to amine by reaction of a nitroaniline with the oil; the imine is isolated as a solid; and the solid imine is converted back to the 2-methodxy-5-trifluormethoxy benzaldehyde oil. The nitroaniline is selected from the group consisting of 3-nitroaniline 3-methyl-2-nitroaniline, 4-methyl-2-nitroaniline 2 methyl-3-nitroaniline and 4-methdyl-3-nitroaniline.
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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 24, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 24, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2025.
- 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.