Quaternary ammonium salts of sulfonylurea
CA 2272597 A1 · Owner: Tirol, Arturo Aclaro · Inventors: Tirol, Arturo Aclaro; Wysong, Robert D.; Chen, Chia-Chung
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a compound comprising a quaternary ammonium salt of a sulfonylurea having the formula (see formula I), wherein R1 is a substituted or unsubstituted phenyl heterocyclic ring, or , phenoxy, or, -N(CH3)(SO2CH3); R2 is H or CH3; R3 is a substituted or unsubstituted pyrimidine or a substituted, or unsubstituted triazine; R4 and R5 are independently unsubstituted or hydroxy substituted linear, or branched C1-C4 alkyls -(CH2CH2O)m CH2CH2OH, or -(CH2CHCH3O)m CH2CHCH3OH where, m is 1 to 10; R6 is a substituted or unsubstituted benzyl ethylbenzyl, naphthylmethyl, or linear or branched C1-C22 alkyl; R7 is a substituted or unsubstituted linear or , branched C8-C22 …
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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 21, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2021.
- 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.