Expired Canadian patentCanada
Catalyst composition for the polymerization of olefins
CA 2256972 C · Owner: Wenzel, Timothy Todd · Inventors: Wenzel, Timothy Todd
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst composition for the polymerization of olefins is provided, which comprises the reaction product of a fulvene a complex, of an atom selected from Groups 3-14 and the Lanthanides and an, activating cocatalyst.
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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 23, 1998 and granted September 17, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 23, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 23, 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 23, 1998
GrantedSeptember 17, 2002
Term endedDecember 23, 2018
Patent numberCA 2256972 C
Classification (IPC)C08F4/52 +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.