Method of separating ferritic steel or ductile iron from certain nonferrous metals
CA 1095263 A · Owner: General Motors Corporation · Inventors: Hanink, Dean K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure: A method is disclosed for treating scrap metal chips and turnings containing a valuable metal layer of silver gold, or copper and a ductile layer of ferritic steel or ductile. iron to recover the valuable metal. The chips and turnings are treated by carburization and quenching to embrittle the steel layers and then crushed converting the steel to a small mesh powder which can be screened from larger sized agglomerates of valuable metal insensitive to the embrittling process.
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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 February 10, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 10, 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.
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.