Process for the purification of contaminated water
CA 1049163 A · Owner: Feltex Limited · Inventors: Turnbull, Roy H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns the purification of an aqueous liquid, especially effluent from a dyeing process which is contaminated with coloured substances. The aqueous liquid is treated in the substantial absence of fibres and dye complexing retarders with ferric or ferrous ions ferric, hydroxide is formed therefrom and the ferric hydroxide together with the coloured substances is removed from the aqueous liquid. Dye complexing retarders present can be removed by an ion-exchange pre-treatment. The ferric or ferrous ions may be provided by electrolysis of iron or scrap iron, ferric hydroxide, or ferrous or ferric salts.
Read the whole patent
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 20, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 20, 1996.
- 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.