A process for the treatment of effluent streams
CA 2292582 A1 · Owner: Ramsay, James Ian · Inventors: Ramsay, James Ian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for removing sulphates and calcium from a water stream which comprises the steps of: combining the water stream and an amount of amorphous aluminium trihydroxide (Al(OH3)); allowing the formation of ettringite (3CaO.Al2O3CaSO4.31/32H2O) as a precipitate; and removing the precipitated ettringite from the water stream.
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
- Filed June 3, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 3, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 3, 2020.
- 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.