Intermediates for producing substituted indoles as phosphodiesterase type iv inhibitors
CA 2224049 A1 · Owner: Pfizer Limited · Inventors: Masamune, Hiroko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are intermediates useful for producing substituted indoles as phosphodiesterase type IV inhibitor. The intermediates are represented by the formulae (see fig. VI) and (see fig. VII), wherein R9 is hydrogen or (C1-C6)alkyl R15 is oxygen or, hydroxyl and the broken line represents a double bond when R15 is oxygen.
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 October 12, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 12, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 12, 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.