Double metal cyanide catalysts for the production of polyetherpolyols
CA 2458529 A1 · Owner: Ooms, Pieter · Inventors: Schaefer, Walter; Hofmann, Joerg; Ooms, Pieter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to novel double metal cyanide (DMC) catalysts for the production of polyetherpolyols through polyaddition of alkylene oxides to starter compounds, comprising active hydrogen atoms whereby the catalyst , comprises a) double metal cyanide compounds b) organic complex ligands and c) , cyclic polyols. Said catalysts have markedly increased activity in the production of polyetherpolyols.
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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 August 19, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 19, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 19, 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.