Purification of metal melts
CA 2032572 A1 · Owner: Buxmann, Kurt · Inventors: Buxmann, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process for purifying a metal melt (10) operates with an active gas introduced into the lower region thereof and consisting of an inert carrier gas (30) and. an active, gaseous halogen (20) which are introduced under control into a vessel (12) with the stagnant or flowing metal melt (10). The active gaseous halogen (20) is generated at, a controlled rate in at least one gas evolution cell and introduced into the carrier gas. The active gas mixture is passed directly into the metal melt (10). The gas feed line (22) of the halogen does not have any control element. The gas evolution cell for generating the halogen (20) is preferably an exchangeable electrolysis cell (18), gas being …
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 December 18, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 18, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 18, 2012.
- 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.