1-7 substituted xanthine derivatives having antiasthmatic activity, their salts physiologically acceptable, pharmaceutical composition containing them and process for their preparation
CA 2083257 A1 · Owner: Mauro, Fedi · Inventors: Graziano, Bonacchi; Carla, Bacciarelli; Mauro, Fedi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to xanthine derivatives having antiasthmatic activity and of general formula (I) wherein R is a linear or , branched chain alkyl group of from one to six carbon atoms and, R1 is a linear or branched chain alkyl or hydroxyalkyl group of from one to six carbon atoms, with the proviso that R and R1 are never methyl groups simultaneously their physiologically, acceptable salts their pharmaceutical compositions having antiasthmatic activity, as well as two processes for their preparation.
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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 May 23, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 23, 2013.
- 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.