B-n heterocyclic ligands
CA 2225014 A1 · Owner: Nova Chemicals Ltd. · Inventors: Gao, Xiaoliang; Zoricak, Peter; Wang, Qinyan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A catalyst component comprising a group 4 metal having a heterocyclic ligand which is pi-bonded to the metal characterized in, that this ligand contains a boron-nitrogen ("B-N") fragment contained in the ring and further characterized in that a dialkyl amido substituent is bonded to the boron atom. Catalyst systems which contained this catalyst component are useful olefin polymerization catalysts particularly for the preparation of polyethylene. The resulting polyethylenes are characterized by having an extremely broad molecular weight distribution (MWD).
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 16, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2019.
- 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.