Composition and method for controlling silica and water soluble silicate deposition
CA 2094420 A1 · Owner: Perez, Libardo A. · Inventors: Nguyen, Khac T.; Perez, Libardo A.; Brown, J. Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for the inhibition of silica and silicate deposits on the internal surfaces of a water system consisting of adding to the water system a composition comprised of a blend oftwo water soluble copolymers. The first copolymer contains repeat units of maleic or acrylic acids and a phosphinic acid or salt, forms thereof. The second copolymer contains repeat units of acrylic acid and allyl hydroxy propyl sulfonate ether or salt, forms thereof.
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
- Filed April 20, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 20, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 20, 2015.
- 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.