Clarifying and/or filtering of green liquor and an apparatus therefor
CA 2184284 C · Owner: Engdahl, Holger · Inventors: Pokkinen, Martti; Tormikoski, Pekka; Engdahl, Holger
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a, method of and an apparatus for treating the green liquor formed in a sulphate, pulp mill especially to a method of en-, hancing the clarification of the green filter. According to the invention, at least a portion of the green liquor stream of the mill is directed into a clarifier. Clarified green liquor is discharged from the clarifier while dregs-containing green liquor is discharged from the bottom, of the clarifier. The dregs-containing green liquor is directed into a filter in which it is filtered for forming a, filtrate and a dregs. Dregs separated from the green liquor can be washed, already in this step thus lightening the, load on the actual …
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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
- Filed March 6, 1995 and granted July 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 6, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 2017.
- 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.