Method and apparatus for dewatering and loosening raw biopulp
CA 2101271 A1 · Owner: Von Bulsingslowen, Frederik · Inventors: Abom, Jan; Von Bulsingslowen, Frederik; Kubat, Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for production of dewatered and loosened biopulp is, described wherein precrushed raw biopulp is press fed against a pair of counter-rotating press rolls between which the biopulp is subjected to a pressure whereby it is dewatered and fed into a backpressure vessel maintained at an overpressure which prevents the water pressed out from entering the backpressure vessel and prevents remoistening of the dewatered biopulp whereafter the biopulp , is transferred from the backpressure vessel and subjected to well-known chemical and mechanical treatments for production of powdered fuel, fillers for plastics or pulp for making paper. An apparatus for carrying out said method is also …
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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 December 27, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 27, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 27, 2013.
- 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
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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.