Salts of an anti-migraine indole derivative
CA 2198599 C · Owner: Pfizer Finance International Limited · Inventors: Harding, Valerie Denise; Macrae, Ross James; Ogilvie, Ronald James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an .alpha.-polymorphic form of a compound of formula (I), to processes for the preparation thereof to an intermediate .beta.-, polymorphic form and to pharmaceutical compositions and therapeutic uses thereof.
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 May 17, 1995 and granted June 6, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2017.
- 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.