Diclavulanate salt with a diamino ether and process of preparation
CA 2208520 C · Owner: Callewaert, George Leo · Inventors: Callewaert, George Leo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A di-clavulanate salt derived from clavulanic acid and a diamino ether of formula (I), where R1 is an alkylene group optionally having one or more , inert substituents; and each of R2 and R3 is a hydrogen atom or an alkyl group, optionally having one or more inert substituents or R2 and R3 together , complete a heterocyclic ring having 4 to 7 carbon atoms again optionally , having one or more inert substituents. The salt is prepared by reacting a bis(2-dialkylaminoalkylene)ether (or a salt thereof) with clavulanic acid in an organic solvent and isolating the resulting salt. The clavulanic acid salt can be used in pharmaceutical formulations together with a pharmaceutically acceptable …
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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 December 22, 1995 and granted October 7, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 22, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2017.
- 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.