Continuous sulphur drossing process
CA 1079528 A · Owner: Broken Hill Associated Smelters Proprietary Limited (The) · Inventors: Kelly, Robert G.; Lawson, Frank; Ward, Denby H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A continuous sulphur drossing process for the decoopering of lead. The process comprises treating lead bullion with sulphur in at least two reaction stages in series with agitation, adding, sulphur to the lead bullion in at least one of the reaction stages, continuously and concurrently transferring the lead bullion, dross and any unreacted sulphur from each reaction stage to the next, and separating the dross from the decoppered bullion in a dross separation stage that is without agitation.
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
- Granted June 17, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 17, 1997.
- 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.