Patent US3677040A successfully refreshed from Google Patents.
US3677040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the washing of primarily, cellulosic pulp
Assignee: Valmet AB
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Filing: 1971-05-14
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Granted: 1972-07-18
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Expires: 1991-05-14
Abstract
Abstract In the liquid treatment of cellulosic pulp by a procedure comprising passing a column of a slurry of the pulp to be treated through a cylindrical vessel, in one direction, and forcing a treating liquid through the column, in a direction transverse to the major axis of the column, from a delivery space for such treating liquid toward a collection vessel for used treating liquid, said collection vessel having a pervious wall immediately adjacent said column on that side thereof remote from said delivery space, it is desirable-in the interest of preventing clogging of the pervious wall-intermittently to interrupt inflow of liquid into said vessel by pressure variations induced by a gaseous fluid discharged under pressure adjacent said pervious wall.
Inventors
- 👤 Bengt Edvard Pettersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:18
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
136 words
An apparatus for liquid treatment of fibrous materials suspended in a liquid comprising an upright container, adapted to be traversed, in its axial direction, by a suspension to be subjected to liquid treatment, at least one means for supplying treatment liquid and at least one chamber for collecting withdrawn liquid, said means and chamber being provided within said container and being positioned within the suspension within said container, said means and chamber being located transversEly of the container, means for delivering pressure impulses of a gas to the collecting chamber for withdrawn liquid which delivery means includes at least one conduit connecting the collecting chamber with said means for delivering time-controlled doses of compressed gas and operatively connected to said conduit, said delivery means comprising a container for gas under pressure connected to a time-controlled means.
Claim 2
Independent Claim
136 words
An apparatus for liquid treatment of fibrous materials suspended in a liquid comprising an upright container, adapted to be traversed, in its axial direction, by a suspension to be subjected to liquid treatment, at least one means for supplying treatment liquid and at least one chamber for collecting withdrawn liquid, said means and chamber being provided within said container and being positioned within the suspension within said container, said means and chamber being located transversEly of the container, means for delivering pressure impulses of a gas to the collecting chamber for withdrawn liquid which delivery means includes at least one conduit connecting the collecting chamber with said means for delivering time-controlled doses of compressed gas and operatively connected to said conduit, said delivery means comprising a container for gas under pressure connected to a time-controlled means.
Claim 3
Dependent Claim
125 words
An apparatus according to claim 1, comprising an upright container of substantially cylindrical shape, adapted to be traversed, in its axial direction, by a suspension to be subjected to liquid treatment, at least one means for supplying treatment liquid being provided within said container and being positioned below the intended level of suspension within said container, and at least one chamber for collecting withdrawn liquid, arranged in a corresponding manner but displaced in the radial direction in the container, means for delivering a pulsated flow of a gas under pressure to the collecting chamber for withdrawn liquid which delivery means includes at least one conduit connecting the collecting chambers with said means for delivering time-controlled doses of compressed gas and operatively connected to said conduit.
Claim 4
Dependent Claim
21 words
Apparatus according to claim 2 in which said conduit is adapted to deliver gas to the outside of the collecting chamber.
Claim 5
Dependent Claim
15 words
Apparatus according to claim 2, in which said conduit debouches into the collecting chambers proper.
References Cited (Backward Citations)
US3078703A
Cited
US3348390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |