Aromatics-non-aromatics separation by permeation through thermally crosslinked nitrile rubber membranes
CA 2000281 A1 · Owner: Exxon Research And Engineering Company · Inventors: Black, Laura Elizabeth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aromatic hydrocarbons are separated from mixtures of same with non-aromatics by permeation through a membrane of thermally crosslinked polyconjugated diene rubber containing from 15 to 50 wt% nitrile groups. Thermal crosslinking increases selectivity far beyond the level obtained when crosslinking is caused by other techniques. The separations are conducted under pervaporation or perstraction conditions.
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 October 6, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 6, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 6, 2011.
- 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.