Preparative analytical technique to isolate surfactant from oil/water emulsions
CA 2118970 A1 · Owner: Staffeld, Peter Owens · Inventors: Staffeld, Peter Owens; Princen, Henricus Matthews
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a preparative analytical technique for isolating a surfactant from an oil/water emulsion. First a sludge sample containing said emulsion is separated into separate oil, water and solid phases. Thereafter water, droplets are injected into the oil phase. The water droplets fall through the oil phase, causing surfactant in the oil phase to adhere to said droplets which form a high-internal-phaseratio (HIPR) water-in-oil emulsion that is rich in surfactants. This emulsion is subsequently separated into an oil and a water phase. The separated surfactant-rich oil phase is then analyzed to obtain information concerning the surfactant.
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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 March 14, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 14, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 14, 2016.
- 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.