Metal chelating compounds
CA 2136970 A1 · Owner: Canning, Lewis R. · Inventors: Archer, Colin M.; Bower, Gary R.; Gill, Harjit K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
2136970 9422816 PCTABScor01, Ligands for radiopharmaceutical use are capable of chelating radiometal species and of being bound to biological targeting molecules. The ligands have formula (a) and (b) where A, A' = -SZ or Y, B = O or S, Y = (c) Z = H or a thiol protecting group, m = 2 or 3, n = 2 or 3, q = 0 or 1, R = H or unsubstituted or substituted hydrocarbon and pharmaceutically acceptable salts provided that, at least one CR2 group represents CO and forms together with , an adjacent N atom, a -CONR- amide group.
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 31, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 31, 2016.
- 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.