Process for the preparation of the salts of 3,3-dideutero-2-fluoroacylic acid and of trideutero-2-fluoroacrylic acid and their use
CA 2092689 A1 · Owner: Dapperheld, Steffen · Inventors: Heumuller, Rudolf; Wildt, Manfred; Dapperheld, Steffen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, Process for the preparation of the salts of 3,3dideutero-2-fluoroacrylic acid and of trideutero-2fluoroacrylic acid and their use, Process for the preparation of compounds of the formula (I), (I), where n = 1, 2 or 3, by reaction of compounds of the formula (V) (V), (R12 is a hydrogen or deuterium atom) with equimolar amounts of a base in water or an organic solvent or a mixture of water with one or more organic solvents at a, temperature which is in the range between the solidification point and the boiling point of the reaction solution. A(+) is a NH4(+) group or a NH3D(+) group a metal M(+), preferably an alkali metal or an alkaline earth metal or, a primary, secondary, …
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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 September 12, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 12, 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.