Heteroaromatic quinuclidinenes, their use and preparation
CA 2135487 C · Owner: Johansson, Gary · Inventors: Nilsson, Bjorn; Nilvebrant, Lisbeth; Johansson, Gary
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to novel compounds of general formula (I) wherein R is , a group of general formula (II) or (III) where X1 represents oxygen or sulphur and Y1 and Z1 both represent carbon or , X1 represents oxygen and one of Y1 and Z1 represersts nitrogen and the other represents carbon or X1 represents , sulphur, Y1 represents nitrogen and Z1 represents carbon; one of X2, Y1 and Z2 represents oxygen or sulphur and the other two both represent carbon or one represents nitrogen and the other represents carbon, and the dotted line in formula (III) represents an optional additional carbon-carbon or carbon-nitrogen bond; A1, A2, A3 and A4 each represent carbon or when one of , X2, Y2 …
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 11, 1993 and granted December 14, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 11, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 11, 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.