Process for purification of anhydrous hydrogen chloride gas
CA 2482595 A1 · Owner: Steffens, Friedhelm · Inventors: Weymans, Guenther; Brady, Bill L. Jr.; Keggenhoff, Berthold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
High boiling contaminants such as chloro-aromatic compounds are removed from anhydrous hydrogen chloride gas by compressing the gas containing the contaminant, cooling the compressed gas to reduce the temperature of the gas to at least 20 ~C above the outlet temperature of a second cooling stage (c) but above the freezing point of the highest melting compound in the first cooling stage (b), further cooling the gas in a second cooling stage to at least -20 ~C, returning cooled gas (4) from the second cooling stage to the first cooling stage, and recovering condensate streams (7,8) which contain the contaminant compound from the first and second cooling stages. An apparatus suitable …
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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 April 10, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 10, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 10, 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.