Pyrimidopyrimidine compounds
CA 2284811 A1 · Owner: Calvert, Alan Hilary · Inventors: Curtin, Nicola Jane; Golding, Bernard Thomas; Newell, David Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A range of dipyridamole analogues useful for inhibiting transport of nucleosides or purines across cell membranes thereby to potentiate the , activity of various cytotoxic antitumour drugs is diclosed. These analogues , comprise compounds having general structural formula (I) or pharmaceutically acceptable salts thereof; wherein R1 is chloro and R3 is diethanolamino or R1 , and R3 are identical and are selected from allyl halo, diethanolamino, solketalo and a group having the formula: -O-Rz or -NHRz Rz being selected , from alkyl, hydroxyalkyl alkoxyalkyl, dialkoxyalkyl and 2-oxo-alkyl wherein the or each alkyl and/or alkoxy moiety has less than six carbon atoms and R2 , and R4 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 April 1, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 1, 2020.
- 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.