Antiviral tetrahydroimidazo 1,4 benzodiazepin-2-thiones
CA 2010639 C · Owner: Janssen, Paul A.J. · Inventors: Breslin, Henry J.; Janssen, Paul A.J.; Van Gelder, Josephus L.H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel tetahydroimidazo1,4benzodiazepin-2-thiones are disclosed which possess antiviral activity, and have the structure of formula (I): (see formula I), wherein, R1 is C1-6alkyl C3-6alkenyl, C3-6alkynyl, C3-6cycloalkyl or C1-6alkyl, substituted with aryl or with C3-6cycloalkyl; R2 is hydrogen or C1-6alkyl;, R3 is hydrogen or C1-6alkyl; R4 and R5 each independently are hydrogen C1-6alkyl, halo, cyano, nitro, trifluoromethyl hydroxy, C1-6alkyloxy, amino or mono-or di(C1-6alkylamino); and , aryl is phenyl optionally substituted with from 1 to 3 substituents independently, selected from C1-6alkyl halo, hydroxy, C1-6alkyloxy, amino, nitro and trifluoromethyl, or pharmaceutically acceptable acid …
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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 February 22, 1990 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 2012.
- 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.