Prodrugs of anticancer agents employing substituted aromatic acids
CA 2440091 C · Owner: Greenwald, Richard B. · Inventors: Greenwald, Richard B.; Choe, Yun H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymeric prodrugs of the formula: (I) wherein B is selected from the group consisting of OH, leaving groups, residues of amine-containing moieties and a residues of hydroxyl-containing moieties; Y1 is selected from the group consisting of O, S, and NR5; M is NR3, O or S; Ar is a moiety which when included in Formula (I) forms a multi-substituted aromatic or heteroaromatic hydrocarbon or a multi-substituted heterocyclic group; (m) is zero or a positive integer; R1-3 and R5 are independently selected from the group consisting of hydrogen, C1-6 alkyls, C3-8 cycloalkyls C1-6 substituted , alkyls, C3-8 substituted cycloalkyls aryls, substituted aryls, aralkyls, C1-6 heteroalkyls, …
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 March 21, 2002 and granted May 3, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 21, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 21, 2024.
- 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.