Continuous purification of an off-gas composed of co2 + hc1 + coc12
CA 2077235 A1 · Owner: Wittmer, Peter · Inventors: Ksoll, Peter; Reuther, Wolfgang; Wittmer, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
O.Z. 0050/42662, Abstract of the Disclosures A continuous process for purifying an off-gas composed of CO2 + HCl + COC12 entails using a separator filled with N,N-dialkylformamide x HCl - to react COC12 with N,N-dialkylformamide to give the Vilsmeier complex + CO2, and, - to remove CO2/HCl and HCl separately from the separator.
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 August 31, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 31, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 31, 2014.
- 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.