Expired Canadian patentCanada
Chiral phospholane transition metal catalysts
CA 2082166 C · Owner: E. I. Du Pont De Nemours And Company · Inventors: Burk, Mark Joseph
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Chiral 2,5-disubstituted phospholanes useful as transition metal ligands in asymmetric catalysis and processes for their preparation are disclosed.
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 1, 1991 and granted October 16, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 1, 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.
FiledMay 1, 1991
GrantedOctober 16, 2001
Term endedMay 1, 2011
Patent numberCA 2082166 C
Classification (IPC)C07F9/54 +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.