Phthalazinone derivatives
CA 2109992 A1 · Owner: Kump, Wilhelm · Inventors: Kump, Wilhelm
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Phthalazinone derivatives, The invention relates to compounds of formula I (I), wherein, A1 and A2 are hydrogen; unsubstituted or substituted lower alkyl lower alkenyl or lower, alkynyl; heterocyclyl-lower alkyl; acyl; lower alkylsulfonyl; or arylsulfonyl; or together are unsubstituted or substituted lower alkylene; Ar1 and Ar2 are aryl, heteroaryl or unsubstituted or substituted cycloalkyl; X is oxygen or sulfur; and, Q is a divalent radical of the formula which is bonded by its Y-carrying, carbon atom to the Q-binding carbon atom and by its RB-carrying nitrogen atom to the RA-carrying nitrogen atom in formula I wherein, Y is oxygen or sulfur, and, RA and RB are hydrogen unsubstituted or …
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 November 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 25, 2015.
- 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.