Method for treating alkaline waste water
CA 2297281 A1 · Owner: Chavet, Bernard · Inventors: Chavet, Bernard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for treating alkaline waste water derived from washing waste oil with water and containing organic substances comprising a predetermined sequence of steps consisting in: a) contacting the alkaline waste water at a temperature between 60 and 105 ·C approximately for a time interval between 5 and 60 minutes approximately with a mineral acid in amount greater than 1 to 20 % than that corresponding to the reaction stoichiometry transforming into mineral salt all the atoms present in the alkaline waste water to be treated; b) allowing the resulting organic and aqueous phases to decant at a temperature between 60 and 105 ·C approximately to recuperate the aqueous …
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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
- Filed July 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 22, 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.