Hydrogen fluoride recovery process
CA 2284052 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Ewing, Paul Nicholas; Low, Robert Elliott; Shields, Charles John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for recovery of hydrogen fluoride comprises contacting a gaseous mixture containing hydrogen fluoride and an organic compound with a solution of an alkali metal fluoride in hydrogen fluoride separating a gas phase , depleted in hydrogen fluoride and containing the organic compound from a liquid phase enriched in hydrogen fluoride and then recovering the hydrogen , fluoride from the liquid phase.
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 6, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2020.
- 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.