Expired Canadian patentCanada
Preparation of mono- and di-arylphosphines
CA 2255161 C · Owner: Cytec Technology Corp. · Inventors: Rickelton, William Andrew; Hillhouse, John H.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mono- and di-arylphosphines are prepared by reacting an aryl compound that has a leaving group attached to a carbon atom of the aromatic ring with phosphine in the presence of a Group VIII metal catalyst.
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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 December 3, 1998 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 3, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 3, 1998
GrantedSeptember 16, 2003
Term endedDecember 3, 2018
Patent numberCA 2255161 C
Classification (IPC)C07F9/50 +1 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.