Device and method for removing dross from a vessel of molten zinc with enhanced zinc yield
CA 2346425 A1 · Owner: Hennessy, Ann J. · Inventors: Hennessy, Ann J.; Lemper, Herbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for removing dross from the surface of the molten metal and for extracting usable elemental metal from the dross. The device comprises a container in which the dross is collected a means for lifting the container , out of the molten bath of metal and an agitating means for chopping the dross to separate the elemental metal from the particles of metal oxides contained in the dross. Preferably, the container has perforations therein such that the elemental metal may drain through the perforations and back into the molten bath. The remaining dross is then dumped in a recycle bin by the device.
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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 October 5, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 5, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 5, 2021.
- 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.