Polymerization of olefins
CA 2300085 A1 · Owner: E.I. Du Pont De Nemours And Company · Inventors: Arthur, Samuel David; Ittel, Steven Dale; Coughlin, Edward Bryan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mixtures of different polyolefins or branched polyolefins may be made by direct, preferably simultaneous, polymerization of one or more polymerizable olefins using two or more transition metal containing active polymerization catalyst systems, one of which contains preferably late transition metals complexed to selected ligands. The polyolefin products may have polymers that vary in molecular weight, molecular weight distribution crystallinity, or , other factors, and are useful as molding resins and for films.
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 August 26, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 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.
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.