Cationically modified cellulose-containing materials and their use for the purification of industrial effluent
CA 1085388 A · Owner: Ciba-Geigy Ag · Inventors: Wurster, Rudolf F.; Wegmuller, Hans; Liechti, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel process for the purification of industrial effluents wherein the effluents are brought into contact with cationically modified, cellulose-containing materials the cationic, constituent of which is bonded to the cellulose part via the grouping of the general formula, - O - CH2 - N? in which the nitrogen belongs to an amide group of the cationic constituent and the oxygen is bonded to the cellulose part.
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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 September 9, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 9, 1997.
- 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.