Orally active antiviral compounds
CA 2111854 C · Owner: Ganguly, Ashit K. · Inventors: Saksena, Anil K.; Girijavallabhan, Viyyoor M.; Ganguly, Ashit K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound represented by formula (I) Ar1-O-M-O-Ar2 wherein Ar1 and Ar2 are independently substituted phenyl or, substituted pyridinyl the substituents on said phenyl or pyridinyl being independently selected from one, two or three of (C1-C10)alkyl, (C1-C10)alkoxy, halogen carbamyl, dialkylcarbamyl, (C1-C10)-, alkoxycarbonyl oxazoyl, and (C1-C10)alkyl, substituted by halogen (C1-C10)alkoxy, hydroxy, or (C1-C10)alkoxycarbonyl; M is M-1, M-2, M-3 or M-4 (C4-C8)alkylene (C4-C8) alkenylene or (C4-C8)-alkynylene; O is oxygen; R' is (C1-C3)alkyl or H; A is oxygen or sulfur; Q is selected from hydrogen, halogen, nitro, (C1-C6) alkyl (C1-C6) perhaloalkyl, (C1-C6) , alkylthio (C1-C6) alkyl …
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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 17, 1992 and granted January 9, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 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.