Substances for the manufacture of paper
CA 1305266 C · Owner: Wolff Walsrode Ag · Inventors: Bohmer, Branislav; Hoppe, Lutz; Szablikowski, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
23189-6673, New substances of the manufacture of paper ABSTRACT, The present invention relates to a composition for the manufacture of paper, containing a cationic polyacrylamide C) and at least one other polymer, comprising: A) at least one polyamidamine or;, B) at least one polyamine and; C) at least one cationic polyacrylamide having recurrent dimethylaminopropylacrylamide units which may be quaternized. These substances are suitable for use as retention agents containing a cationic polyacrylamide with recurrent dialkylaminoalkylacrylamide units and a polyamidamine or a polyamine.
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 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 2009.
- 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.