Flocculant for sludges
CA 1183290 A · Owner: Basf Aktiengesellschaft · Inventors: Burkert, Hans; Beyer, Karl-Heinz; Brunnmueller, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sludges are flocculated by the addition of a polymer which is prepared by the homopolymerization of N-vinylformamide in the presence of a free-radical polymerization initiator to give a poly-Nvinylformamide, followed by hydrolysis of from 10 to 90% of the formyl groups in the poly-N-vinylformamide.
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 February 26, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 26, 2002.
- 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.