High solids w/o inverse emulsions of polyacrylics
CA 1302616 C · Owner: Butterworth, Stephen J. · Inventors: Jheeta, Ravinder K.; Butterworth, Stephen J.; Baker, Alan S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a process for producing a water-in-oil emulsion of a water-soluble polyacrylamide or polyacrylic acid polymer or copolymer by the inverse emulsion process characterised in that there is used as the emulsifying agent for the water-in-oil emulsion a water-insoluble, oil-soluble surface active agent of the formula (I):, X-Y-Z, or a functional derivative thereof wherein X- represents, a saturated or unsaturated hydrocarbon chain containing from 30 to 500 carbon atoms, -Y,- represents a succinic anhydride residue carried terminally upon the group Xand -Z represents a hydrophilic group carried by the group -Y.
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 June 2, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 2, 2009.
- 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.