Improved syndiotactic vinylidene aromatic polymerization process
CA 2248365 A1 · Owner: The Dow Chemical Company · Inventors: Newman, Thomas H.; Borodychuk, Karen K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing syndiotactic vinylidene aromatic polymers comprising contacting one or more vinylidene aromatic monomers with a catalyst composition comprising a Group 4 metal complex an activating cocatalyst, and , a hydrocarbylsilane or di(hydrocarbyl)silane adjuvant.
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 April 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 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.