Preparation of supported catalyst using trialkylaluminum-metallocene contact products
CA 2297481 A1 · Owner: Kissin, Yury Viktorovich · Inventors: Mink, Robert Ivan; Kissin, Yury Viktorovich; Nowlin, Thomas Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A silica-supported metallocene catalyst made from two components is disclosed. The first component is made from dried silica having hydroxyl groups and an alumoxane scurried together and then dried of its solvent. The second component is made by contacting a group 4 metallocene and a trialkylaluminum in a solvent in which the metallocene is insoluble. The two components are then combined to form the metallocene catalyst.
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 July 1, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 1, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 1, 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.