Preparation of olefin copolymers of sulfur dioxide or carbon monoxide
CA 2347377 A1 · Owner: Proulx, Grant · Inventors: Proulx, Grant
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copolymers of sulfur dioxide and/or carbon monoxide and olefins especially , ethylene, can be made by contacting these monomers with a combination of selected strong Lewis acid and a selected metal or a compound of a selected metal. The resulting polymers, which are often alternating copolymers are , useful as molding resins.
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 8, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2021.
- 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.