Expired Canadian patentCanada
Process for water-in-oil emulsions of water- soluble polymers
CA 1137697 A · Owner: American Cyanamid Company · Inventors: Pellon, Joseph J.; Savoy, Paul D.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Reduced coagulum is obtained when water-soluble monomers are polymerized in the dispersed phase of a water-in-oil emulsion and added salt is present in the aqueous monomer phase.
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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 December 14, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 14, 1999.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 1, 1979
GrantedDecember 14, 1982
Term endedDecember 14, 1999
Patent numberCA 1137697 A
Classification (IPC)C08F2/32 +1 more
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.