Modified prodrug forms of ap/amp
CA 2423220 C · Owner: Karra, Srinivasa · Inventors: Doyle, Terrence W.; Qiao, Qi; Xu, Yang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to compounds according to the structure of following formula (I), where R is H or CH3; R2 is phosphate which can be free acid or salt; R3 is H, F, C1, Br, I, OCH3 OCF3, CF3 or a C1-C3 alkyl group; , R4 is H F, C1, Br, I, OCH3, OCF3 or CF3; and R5 and R6 are each independently H, F, C1, Br, I, OCH3, OCF3 or CF3, with the proviso that when any two of R3 R4, R5 or R6 are other than H, the other two of R3 R4, R5 or R6 are H which , may be used to treat neoplasia including cancer.
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 October 15, 2001 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 15, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 15, 2023.
- 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.