Expired Canadian patentCanada
Improved catalyst composition
CA 2105555 C · Owner: Tracy, John C. · Inventors: Kolthammer, Brian W. S.; Cardwell, Robert S.; Tracy, John C.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An addition polymerization catalyst comprising a cationic complex of a Group 4 metal cyclopentadienyl derivative and an alumoxane shows improved resistance to catalyst poisons.
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 December 1, 1992 and granted December 30, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 1, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 1, 2014.
- 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 1, 1992
GrantedDecember 30, 2003
Term endedDecember 1, 2012
Patent numberCA 2105555 C
Classification (IPC)C08F4/64 +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.