Carboxylic acid derivatives
CA 2099309 A1 · Owner: Maienfisch, Peter · Inventors: Boger, Manfred; Maienfisch, Peter; Pitterna, Thomas
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PI/5-19138/A, Carboxylic acid derivatives Abstract, Compounds of the formula, (I) in which, A is oxygen, sulfur or -NR1-; B is C2-C6alkylene, D-E is -O-E, -S-E, -O-CH2-E -O-C(=O)-E, -O-C(=O)-O-E, -O-C(=O)-N(H)-E or -O-C(=S)-N(H)-E;, E is phenyl; phenyl which is substituted by one to three substituents; a five-membered aromatic heterocycle having one to three hetero atoms; a five-membered aromatic heterocycle which has one to three hetero atoms and which is substituted by one or two substituents; a six-membered aromatic heterocycle which has one to three nitrogen atoms; or a six-membered aromatic heterocycle which has one lo three nitrogen atoms and which is substituted by one or two …
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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 June 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 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.