Dewaterability of alum sludges using low molecular weight anionic flocculants
CA 1206059 A · Owner: Nalco Chemical Company · Inventors: Wetegrove, Robert L.; Tichenor, George J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for dewatering alum sludges obtained from waste water treatnent processes which comprises treating said sludges prior to or during their, formation, with an anionic copolymer of acrylamide and acrylic acid said, polymer having a molecular weight of at least between 1 million and 5 million said polymer being further characterized as containing between 60-98% by weight of acrylamide.
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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 June 17, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 17, 2003.
- 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.