Quinoxalinediones
CA 2248366 C · Owner: Gautier, Elisabeth Colette Louise · Inventors: Bull, David John; Gautier, Elisabeth Colette Louise; Mowbray, Charles Eric
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides compounds of formula (I) and the pharmaceutically acceptable salts thereof, wherein R is a 5-membered ring heteroaryl group containing 3 or 4 nitrogen heteroatoms which is linked to the quinoxalinedione ring by a ring carbon or nitrogen atom or is a 6-membered ring heteroaryl , group containing from 1 to 3 nitrogen heteroatoms which is linked to the quinoxalinedione ring by a ring carbon atom either of said groups being , optionally benzo-fused and optionally substituted including in the benzo-, fused portion by 1 or 2 substituents each independently selected from C1-C4 alkyl, C2-C4 alkenyl, C3-C7 cycloalkyl halo, hydroxy, C1-C4 alkoxy, C3-C7 , cycloalkyloxy …
Read the whole patent
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 27, 1997 and granted June 4, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2019.
- 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.