Water soluble terpolymers and methods of use thereof
CA 2059963 A1 · Owner: Betz Laboratories, Inc. · Inventors: Chen, Fu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A water soluble terpolymer useful in controlling deposition of scale in aqueous systems comprised of monomeric repeat units (g), (h) and (i) wherein repeat unit (9) comprises the structure wherein E is the repeat unit obtained after polymerization of an .alpha..beta. ethylenically unsaturated compound wherein repeat unit, (h) comprises the structure wherein R1 and R2 are the same or different and denote H methyl or ethyl and M is a water soluble cation or H and, -20-, wherein repeat unit (i) comprises the structure wherein R3 is H or a lower alkyl (C1-C3) R4 is a hydroxy, substituted alkyl or alkylene group having from 1 to about 6 carbon atoms or a non-substituted alkyl or alkylene group …
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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
- Filed January 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2014.
- 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.