Floatation process for deinking printed waste paper
CA 1325084 C · Owner: Lehmann, Klaus · Inventors: Hawel, Hans; Schuster, Gregor; Lehmann, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A flotation process for the de-inking of printed waste-paper by treating the paper pulp in the pulper at alkaline pH-values by means of alkali silicate oxidative, bleaches and separating the loosened printing-ink particles from the fibrous material suspension by flotation in which, protein fatty acid condensates are added finely distributed, possibly together with dispersing agents in, a solution or dispersion which is fluid at normal temperature.
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 December 14, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 14, 2010.
- 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.