Chromium and zinc removal and recovery by ion exchange
CA 1160458 A · Owner: Petro-Metals Recovery Systems Limited · Inventors: Bridle, Michael K.; Scott, Terrence I.; Westlake, Vincent H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the removal of chromium and zinc the combination of an anion exchange, resin and cation exchange resin in a single vessel the anion exchange resin, being selective of chromium in its chromate and dichromate ionic forms and the, cation exchange resin being an intermediate acid cation exchange resin with a phosphonic acid functional group on a cross-linked polystyrene matrix having, the repeating structural formula: selective of zinc in its ionic form, said single vessel having distributors, selected from the group of inlet distributors regenerant distributors, sub-, surface washers collectors, disposed therein, and inlets and outlets for the addition or removal of effluent, water and …
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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 17, 1984. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 17, 2001.
- 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.