Canadian application, no grantCanada
Polyacrylamide-phosphonate flocculants and methods of making and use thereof
CA 2130587 A1 · Owner: Nagan, Leo E. · Inventors: Nagan, Leo E.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Anionic water treatment polymers are, obtained by reacting polyacrylamide and phosphorous acid.
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 August 22, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 22, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 22, 2016.
- 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 22, 1994
GrantedNo grant recorded
Term endedAugust 22, 2014
Patent numberCA 2130587 A1
Classification (IPC)C08F20/56 +2 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.