Expired Canadian patentCanada
2-hydroxy-6-phenylphenanthridines as pde-4 inhibitors
CA 2495827 C · Owner: Takeda Gmbh · Inventors: Schmidt, Beate; Kautz, Ulrich
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is described compounds of the formula I (see formula I), in which R1, R2, R3, R31 R4, R5, R6 and R7 have prescribed meanings. The compounds are , useful as PDE4 inhibitors e.g. for the treatment of respiratory disorders and/or dermatoses.
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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 28, 2003 and granted May 8, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 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.
FiledAugust 28, 2003
GrantedMay 8, 2012
Term endedAugust 28, 2023
Patent numberCA 2495827 C
Classification (IPC)C07D221/12 +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.