Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With washing
Reexamination Certificate
2005-09-07
2011-11-08
Daniels, Matthew (Department: 1741)
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With washing
C162S315000, C210S402000, C210S784000
Reexamination Certificate
active
08052839
ABSTRACT:
An apparatus for treating pulp including: at least one liquid-permeable surface rotating around a shaft, onto which surface a pulp layer is formed; a feeder to feed pulp to the apparatus for treatment on the liquid-permeable surface; an internal barrier defining a first pulp treatment section and a second pulp treatment section; the first treatment section receiving from the feeder a first type of pulp and the second treatment section receiving from the feeder a second type of pulp, wherein the first type of pulp is supplied to the feeder from a first pulp treatment stage in a pulping system and the second type of pulp is supplied to the feeder from a second pulp treatment stage in the pulping system, and a pulp discharge to discharge treated pulp from the apparatus, wherein the pulp discharge discharges the first type of pulp after treatment separately from discharging the second type of pulp after treatment, and a filtrate discharge to discharge filtrate flowing through the liquid-permeable from the apparatus.
REFERENCES:
patent: 3587257 (1971-06-01), Hurter
patent: 4440596 (1984-04-01), Shannon
patent: 5275024 (1994-01-01), Parks
patent: 5482594 (1996-01-01), Salminen
patent: 5641402 (1997-06-01), Kohonen et al.
International Search Report mailed Dec. 22, 2005.
Pikka Olavi
Rönkönharju Hannu
Tervola Pekka
Andritz Oy
Daniels Matthew
Minskey Jacob Thomas
Nixon & Vanderhye P.C.
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