Anionic acrylamide polymers as copper ore agglomeration aids
CA 1338772 C · Owner: Nalco Chemical Company · Inventors: Gross, Anthony E.; Bonin, Jacqueline L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved method for extracting copper from copper minerals by heap leaching with dilute sulfuric acid which comprises agglomerating the copper mineral fines prior to their being formed into a heap with an agglomerating agent comprising an anionic polymer of acrylamide or methacrylamide which contains at least 5 mole percent of carboxylate or sulfonate groups and has a molecular weight of at least 100,000.
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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 December 10, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2013.
- 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.