Canadian application, no grantCanada
Method for preparing and using supported phospazenium catalysts
CA 2408303 A1 · Owner: The Dow Chemical Company · Inventors: Wehmeyer, Richard M.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Crosslinked organic polymers such as styrene-divinylbenzene copolymers contain pendant phosphazene or phosphazenium groups. These polymers are excellent alkylene oxide polymerization catalysts.
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 May 9, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 9, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 9, 2001
GrantedNo grant recorded
Term endedMay 9, 2021
Patent numberCA 2408303 A1
Classification (IPC)C08G65/26 +2 more
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.