Suspension of water-soluble polymers in aqueous media containing dissolved salts
CA 1340137 C · Owner: Burdick, Charles L. · Inventors: Burdick, Charles L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A suspension of an anionic or nonionic water-soluble polymer in an aqueous solution of an inorganic ammonium salt is characterized in that the polymer comprises at least 15% of the total weight of the suspension, the ammonium salt has a multivalent anion, and the weight ratio of the ammonium salt to the water is at least 0.15.
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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 November 17, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 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.