Method of intensifying the washing of a fibre suspension
CA 1294091 C · Owner: Pikka, Olavi · Inventors: Pikka, Olavi; Vilpponen, Aki; Henricson, Kaj
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method of intensifying the washing of a fibre suspension The present invention relates to a method of intensifying the washing of a fibre suspension. In particular the present invention relates to decreasing the lignin content of a fiber suspension by extracting. Lignin removal is usully carried out at a consistency of less than 3 % whereby heating consumes much energy. The method of the invention allows a considerable increase in the consistency of the suspension which results in that the energy consumption is decreased to a fraction of the one required by prior art methods. A characteristic feature of the method of the invention is that dry substance and chemicals contained in the fibers …
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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 January 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 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.