Crystallization of optical isomers of leukotriene antagonists
CA 2091245 A1 · Owner: Laird, Trevor · Inventors: Mills, Robert John; Laird, Trevor
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to salts of formula (I) where A is 1 and , X is 1 or 2; R1 is C8 to C13 alkyl C7 to C12 alkoxy, C7 to C12 alkylthio, C10 to C12 1-alkynyl 10-undecynyloxy, 11-dodecynyl, phenyl-C4 to C10 alkyl phenyl-C3 to C9, alkoxy, phenylthio-C3 to C9 alkyl with the phenyl unsubstituted or monosubstituted with bromo chloro, trifluoromethyl, C1 to, C4 alkoxy methylthio or trifluoromethylthio, furyl-C4 to C10 alkyl, trifluoromethyl-C7 to C12 alkyl or cyclohexyl-C4 to C10 alkyl; q is 0, 1 or 2, with the proviso that R1 is not alkylthio or phenylthioalkyl when q is 1 or 2; Y is COR3 C(R4)H(CH2)mCOR3, or (CH2)0-1-C-tetrazolyl; R3 is 0-, amino, or C1 to C6 alkoxy, R4 is hydrogen methyl, …
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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 September 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 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
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.