Preparation of diazabicyclic intermediates
CA 2016343 C · Owner: Fox, Darrell E. · Inventors: Fox, Darrell E.; Braish, Tamim F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Diazabicyclo2.2.1heptane intermediates are prepared from 4-hydroxy-L-proline in a five step procedure, or from allo-4-hydroxy-D-proline through a, novel 2-(C1-C6)alkyl-5-substituted-2,5-diazabicyclo- 2.2.1heptane intermediate. The diazabicycloheptanes are of use in the preparation of antibiotic quinolones.
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 May 9, 1990 and granted January 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 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.