Compounds
CA 2006429 A1 · Owner: Stemp, Geoffrey · Inventors: Stemp, Geoffrey
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
B2672/Abs, Abstract, Compounds of formula (I) and pharmaceutically, acceptable salts thereof: (I), wherein, a and b together form an -O- linkage or a bond or (when R2 is hydrogen), CH2;, either Y is N and R2 is hydrogen; or Y is C-R1, wherein, either one of R1 and R2 is hydrogen and the other is nitro, cyano, halo, CF3, C2F5, formyl, aldoxime CF3O, NO2-CH=CH-, NC-CH=CH-; a group RxXwherein Rx is C1-6 alkyl, aryl or heteroaryl either of which may be optionally substituted by one, two or three of C1-4 alkyl, C1-4 alkoxy nitro, halo, CF3 and cyano; and X is C=O O.C=O, C=O.O, CHOH, SO, SO2, O.SO, O.SO2 CONH, O.CONH, O.SO2NH, CO-CH=CH, C=NHOH C=NNH2; or a group, RyRzNZ- wherein Ry and Rz are …
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 December 21, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 21, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 21, 2011.
- 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.