Water treatment process
CA 2019010 A1 · Owner: Buxton Lime Industries Limited · Inventors: Walker, Michael John; Birchall, James Derek
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
QM 35315, ABSTRACT, "WATER TREATMENT PROCESS" Acid water containing toxic levels (> 0.1 ppm) of aluminium is treated to dissolve therein both silicate ions in an amount to create a solution containing at least 40, preferably at least 100, micromoles per litre of silicon and a silicon:aluminium ratio (based on metals) of at least about 6:1 and preferably 10:1 in the water to form a non-toxic complex with aluminium and alkali or alkali metal ions to increase the pH of the water. The preferred treatment agent is a hydraulic calcium silicate, in the form of cement clinker optionally silicate-enriched with a soluble silicate.
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 14, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 14, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 14, 2012.
- 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.