Membrane process for dewatering lube oil dewaxing solvents
CA 2042913 A1 · Owner: Bartels, Craig Roger · Inventors: Bartels, Craig Roger
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
MEMBRANE PROCESS FOR, DEWATERING LUBE OIL DEWAXING SOLVENTS D#79,360 -F, ABSTRACT OF THE INVENTION Water is separated from an MEK toluene dewaxing solvent by pervaporation through a poly(vinyl pyridine) membrane which has been cross-linked with 1,4-dibromobutane mounted on a polyacrylonitrile support layer. - 26 -
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 May 21, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 21, 2013.
- 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.