Process for water treatment
CA 1281442 C · Owner: Allied Colloids Limited · Inventors: Mcgrow, George
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for Water Treatment, Polymers having recurring units derived from monomers of formula I, CH2 = C(R1)CONHR2NR3R4 ------- I wherein R1 is hydrogen or methyl, R2 is straight or branched chain C2-8 alkylene having at least 2 carbon atoms in the backbone and R3 and R4 are independently selected from C1-4 alkyl, most preferably quaternised dimethylaminopropyl methacrylamide polymers for instance, copolymerised with acrylamide are used as flocculating, agents in processes where the polymer is present during part at least of the process in solution in the presence of free chlorine.
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
- Granted March 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 12, 2008.
- 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.