Process for the manufacture of polyglycidylethers
CA 2002153 A1 · Owner: Shell Canada Limited · Inventors: Den Haan, Klaas H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the manufacture of a poly(.beta.-hydrocarbylallyl)ether of a polyhydric compound which, comprises contacting at an elevated temperature an allyl halide of formula I, H2C=CR-CH2X I wherein R is a hydrocarbyl radical and X is a halogen atom, with a polyhydric compound in the presence of a medium comprising water and an organic solvent a, catalyst, and a base, characterised in that the base has a pKb of more than 4, comprises a monovalent anion and is selected from bases that are capable of being transformed under the reaction conditions to compounds that will be liberated from the reaction system. CS4/T0407FF
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 November 3, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 3, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 3, 2011.
- 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.