Thin cellulose membrane regenerated in alcoholic acid solution for dewaxing hydrocarbon oils
CA 1254006 A · Owner: Imperial Oil Limited · Inventors: Hafez, Mahmoud M.; Pauls, Henry W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the production of regenerated cellulose membranes comprising the steps of a) dissolving a cellulose material to form a solution;, b) casting the cellulose solution into a film;, c) coagulating the cellulose solution film using an alkali alcoholic solution;, d) washing the coagulated cellulose film in an alcohol;, e) regenerating the cellulose film using acidic alcohol solution;, f) washing the regenerated cellulose membrane using an alcohol. The regenerated cellulose thus formed may be dried if, desired, preferably without a softener. The regenerated cellulose membrane thus produced, possesses higher flux and superior selectivity for organic liquid separation than regenerated …
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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 May 16, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 16, 2006.
- 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.