Use of anionic polymer nitrate compositions to lower the electrical resistivity of fly ash
CA 2043706 A1 · Owner: Ecc Specialty Chemicals Inc. · Inventors: Sinha, Rabindra
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
C-1505, TITLE OF THE INVENTION, "USE OF IMPROVED ANIONIC POLYMER/NITRATE COMPOSITIONS TO LOWER THE ELECTRICAL RESISTIVITY OF FLY ASH" ABSTRACT OF THE INVENTION, A method for lowering the electrical resistivity of fly ash comprising adding an anionic polymer/ammonium nitrate/sodium nitrate composition to fly ash. Suitable anionic polymers include polymers containing acrylic acid and, optionally, an ethylenically unsaturated sulfonic acid. Polymer/nitrate compositions are also claimed.
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 May 31, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2013.
- 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.