Derivatives of benzeneborinic acid, preparation thereof and use thereof as synthetic intermediates
CA 2108231 A1 · Owner: Synthelabo · Inventors: Chekroun, Isaac; Rossey, Guy; Bedoya-Zurita, Manuel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Derivatives of benzeneborinic acid corresponding to the formula (I), (I), in which R1, R2 and R represent, each independently of, the others either a (C1-C2)alkyl group or an aryl group the group -CR1R2R3 being in position 1 or 2 of the tetrazole ring, preparation thereof, and method of use as synthetic intermediates.
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 October 12, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 2015.
- 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.