Agent for prevention and/or treatment of asthma
CA 2496573 A1 · Owner: Hiura, Naoko · Inventors: Miyaji, Hiromasa; Matsumura, Tsutomu; Sasaki, Katsutoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Preventive and/or therapeutic drugs for asthma containing as the active ingredient substances capable of suppressing the functions of GPR4 relating to signal transduction; and preventive and/or therapeutic drugs for asthma containing as the active ingredient nitrogen-containing tricyclic compounds represented by the general formula (I) quaternary ammonium salts thereof, or pharmacologically acceptable salts of both: (I) wherein R1 is substituted or unsubstituted lower alkyl or the like; R2 is hydrogen substituted or , unsubstituted lower alkyl or the like; R3 and R4 are each independently hydrogen, lower alkyl, or the like; n is 0 or 1; X is -(CH2)2- or the like; and Y is a 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 August 22, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 22, 2025.
- 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.