Water soluble phosphonated polymers
CA 1321043 C · Owner: Chen, Fu · Inventors: Bair, Keith A.; Chen, Fu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel water soluble polymers containing an hydroxyl alkyl aminoalkylene phosphonate functionality are disclosed. These polymers have utility as deposit control agents effective in a number of water systems such as cooling, boilers conversion coating paper and pulp, processing and gas scrubbing. The polymers are formed from the polymerization of ethylenically unsaturated compounds with a compound having the structure: in which R1 is an hydroxyl substituted or nonsubstituted lower alkylene group, R2 is H or lower alkyl group, R3 is a lower alkylene group and M is H or water soluble cation.
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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 August 3, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 3, 2010.
- 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.