Neuroprotective indolone and related derivatives
CA 2080475 C · Owner: Pfizer Limited · Inventors: Chenard, Bertrand Leo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are 5-(1-hydroxy-2-piperidinopropyl)- 2(1H,3H)-indolone derivatives and analogs of the formula: (see formula I), (wherein A is a group for completing a ring; X is O S or (CH2)m, in which m is 0-6; R2 is H or alkyl; R3 and R4 are each H or, together ethylene; and Z1 is H alkyl, alkoxy or halo);, pharmaceutical compositions thereof; methods of treating CNS disorders therewith; and intermediates useful in the preparation of said compounds.
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 March 4, 1991 and granted April 17, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2013.
- 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.