Method for removing pollutants from used oil
CA 2061077 A1 · Owner: Spruijt, Gijsbertus C. · Inventors: Spruijt, Gijsbertus C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method for removing polluting constituents from used oil by heating the used oil to an elevated temperature below 100°C; adding water to the oil; adding sulphuric acid to the oil; thoroughly mixing the oil and the sulphuric acid; allowing the oil-sulphuric acid mixture to react; adding a demulsifier to the oil-sulphuric acid mixture; thoroughly mixing the oil-sulphuric acid-demulsifier mixture; allowing the oil-sulphuric acid-demulsifier mixture to stand in order to allow formation of a water phase containing the pollutants and a purified oil phase; and separating the water phase from the purified oil phase. The sulphuric acid is added to the oil to dissolve heavy …
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 February 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2014.
- 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.