Process for preparing lankacidine carbamate derivatives
CA 2021881 C · Owner: Miyake, Akio · Inventors: Kawai, Tatsuhiko; Miyake, Akio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a lankacidine carbamate derivative of the formula, (see above formula) or a salt thereof, by the reaction of a lankacidine 8-substituted carbonate with an amine, wherein R1 is a hydroxy group or an alkanoyloxy group; and R2 and R3 are each a hydrogen atom, an optionally substituted lower alkyl group, a cycloalkyl group or a phenyl group; or R2 and R3 together with an adjacent nitrogen atom to which they bond form an optionally substituted heterocyclic group. The product is useful as anti-microbial agent.
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 July 24, 1990 and granted April 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 24, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 24, 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.