Method for continuously operated pure distillation of oxiranes, especially propylene oxide
CA 2489765 A1 · Owner: Bassler, Peter · Inventors: Rudolf, Peter; Teles, Joaquim, Henrique; Bassler, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a continuously operated method for pure distillation of oxirane arising during oxirane synthesis by reacting hydroperoxide with an organic compound, characterised in that the raw oxirane is separated in a separating wall column in a light, medium and high boiler fraction and removed as a medium boiler at a concentration of at least 99.9 % by lateral extraction.
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 July 23, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 23, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 23, 2025.
- 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.