Patent US3695448A successfully refreshed from Google Patents.
US3695448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for separating liquid from a slurry
Assignee: Individual
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Filing: 1970-03-30
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Granted: 1972-10-03
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Expires: 1990-03-30
Abstract
Abstract A device for separating liquid from a slurry having a perforated rotatably driven drum into which the water slurry mixture is introduced and fed along the length thereof for dewatering the slurry and having a brush extending along said drum with bristles engaging said drum for being rotated thereby with the bristles engaging and cleaning the drum perforations of foreign material.
Inventors
- 👤 Rolf Ingvar Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:09
CPC Classifications
B; B30; B30B; B30B9/00; B30B9/02; B30B9/12; D; D21; D21C; D21C9/00; D21C9/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A device for Separating liquid from a slurry comprising a rotatably supported elongated drum having a side wall with perforations therethrough throughout its length, an inlet opening at one end and an outlet opening at its opposite end, means connected to said drum and capable of rotating said drum around its axis, an interspaced feed screw assembly attached to and positioned along the interior of said drum wall and a rotatably supported cylindrical brush positioned alongside the exterior of said drum wall with its axis extending lengthwise of said drum wall and having bristles extending radially of said brush axis to said drum wall for being rotated therewith whereby said bristles will remove material from said drum wall perforations.
Claim 2
Independent Claim
119 words
A device for Separating liquid from a slurry comprising a rotatably supported elongated drum having a side wall with perforations therethrough throughout its length, an inlet opening at one end and an outlet opening at its opposite end, means connected to said drum and capable of rotating said drum around its axis, an interspaced feed screw assembly attached to and positioned along the interior of said drum wall and a rotatably supported cylindrical brush positioned alongside the exterior of said drum wall with its axis extending lengthwise of said drum wall and having bristles extending radially of said brush axis to said drum wall for being rotated therewith whereby said bristles will remove material from said drum wall perforations.
Claim 3
Dependent Claim
48 words
A device for separating liquid from a slurry as claimed in claim 1 wherein said interspaced feed screw consists of a plurality of screw flanges extending laterally of and spaced apart along said drum wall providing a plurality of feedless zones therebetween in the interior of said drum.
Claim 4
Dependent Claim
49 words
A device for separating liquid from a slurry as claimed in claim 2 wherein each screw flange is a portion of a screw thread and the screw flanges approaching the outlet opening of said drum have an opposite feeding direction to the screw flanges leading from the inlet opening.
Claim 5
Dependent Claim
31 words
A device for separating liquid from a slurry as claimed in claim 3 wherein the terminals of each screw flange is located substantially in front of the terminals of adjacent flanges.
Claim 6
Dependent Claim
51 words
A device for separating liquid from a slurry as claimed in claim 2 including at least one driving plate provided on said drum wall adjacent at least one screw flange and capable of throwing dewatered pulp back into the zone immediately preceding said screw flange during rotation of said drum. 1
Claim 7
Dependent Claim
45 words
A device for separating liquid from a slurry as claimed in claim 1 including a supply tube extending through said drum inlet opening and extending towards the interior of said drum wall for flushing said wall with water fed into said drum with the slurry.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |