Removal of polychlorinated biphenyls by solvent extraction
CA 1265086 C · Owner: Electric Power Research Institute · Inventors: Way, Peter F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for continuous removal of polychlorinated biphenyl compounds (PCB) from oil contaminated therewith, comprising the steps of continuously extracting PCB compounds from contaminated oil with a PCB-selective solvent in the stripping section of a multistage extraction zone, partially distilling the extract from the extraction zone in a distillation zone cooling and separating the bottom residue into a solvent phase and an oil/PCB phase, continuously recycling a major portion of the oil/PCB phase as extract reflux to the enriching section of the extraction zone where PCs compounds are extracted from the recycled portion by the solvent phase produced in the stripping section …
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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
- Granted January 30, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 2007.
- 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.