Expired Canadian patentCanada
Purine derivatives as a2b adenosine receptor antagonists
CA 2451244 C · Owner: Palle, Venkata · Inventors: Palle, Venkata; Varkhedkar, Vaibhav; Xiao, Dengming
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are novel compounds of formula I that are A2B adenosine receptor antagonists, useful for treating various disease states in particular asthma , and diarrhea.
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 June 27, 2002 and granted January 17, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 27, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 27, 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.
FiledJune 27, 2002
GrantedJanuary 17, 2012
Term endedJune 27, 2022
Patent numberCA 2451244 C
Classification (IPC)C07D473/16 +2 more
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.