Expired Canadian patentCanada
Removal of arsenic, antimony and bismuth from molten copper with sulfur hexafluoride
CA 1093835 A · Owner: Kennecott Copper Corporation · Inventors: French, Robert O.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for removing bismuth, antimony and/or, arsenic impurities from molten copper by contacting such molten copper with sulfur hexafluoride gas which reacts, directly with the specified impurities to form gaseous fluorides, is described.
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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
- Granted January 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 20, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 10, 1976
GrantedJanuary 20, 1981
Term endedJanuary 20, 1998
Patent numberCA 1093835 A
Classification (IPC)C22B15/14 +1 more
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.