Esters of bi- and tricyclic amino alcohols, their preparation and their use in pharmaceutical compositions
CA 2105575 C · Owner: Boehringer Ingelheim International Gmbh · Inventors: Reichl, Richard; Bauer, Rudolf; Banholzer, Rolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The new compounds of formula, A~O~CO~Z (I) wherein, A represents the group (II), (see formula I) wherein, m represents 0 or 1;, R represents a C1-4-alkyl group or a .beta.-fluoroethyl or, .beta.-chloroethyl group; R' represents a C1-4-alkyl group;, or both R and R' together represent a C4-6-alkylene group; and, X- is one equivalent of a physiologically acceptable anion;, Q is -CH=CH- or (see formula II) Z represents the group (III), (see formula III) wherein, R1 is H, OH or CH2OH;, R2 and R3 are selected from the following pairs: (a) thienyl/pyridyl;, (b) thienyl/C1-6-alkyl; (c) thienyl/C1-6-alkyl substituted by phenyl phenoxy, thienyl or C5-7-cycloalkyl;, (d) phenyl/phenyl or …
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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 March 5, 1992 and granted April 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2014.
- 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.