Ziegler-natta catalyst and methods for preparing the same
CA 2447592 C · Owner: Borealis Polymers Oy · Inventors: Van Praet, Erik; Garoff, Thomas; Denifl, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a Ziegler-Natta catalyst for olefin polymerisation comprising a catalyst component in the form of solidified particles. The solidified particles are spherical, have a surface area of less than 20m2/g and are prepared from an emulsion containing the contact product of at least one compound of group 1 to 3 with at least one transition metal of group 4 to 10 or an actinide or lanthanide.
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 June 18, 2002 and granted July 31, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 18, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 18, 2024.
- 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.