Flocculating agents based upon copolymers of acrylamide and dimethylaminopropylacrylamide for use in dewatering sludge
CA 1286448 C · Owner: Chemische Fabrik Stockhausen Gmbh · Inventors: Hartan, Hans-Georg; Landscheidt, Alfons
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to copolymers of acrylamide and dimethylaminopropylacrylamide, useful as flocculating agents in the dewatering sludge which results from the mechanical biological purification of municipal and industrial waste.
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 July 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 2008.
- 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.