Expired Canadian patentCanada
Dewatering agents
CA 1260634 A · Owner: Nalco Chemical Company · Inventors: Halverson, Ann M.; Fong, Dodd W.
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polymers containing as little as 5 mole percent of l-acryloyl-4-methyl piperazine are superior flocculants for treating raw sewage sludges and sludges obtained by biological degradation.
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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 20, 1986
GrantedSeptember 26, 1989
Term endedSeptember 26, 2006
Patent numberCA 1260634 A
Classification (IPC)C02F11/14 +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.