Patent CH272928A successfully refreshed from Google Patents.
Patent US4250038A successfully refreshed from Google Patents.
US4250038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screen device and method
Assignee: WS Tyler Inc
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Filing: 1978-07-21
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Granted: 1981-02-10
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Expires: 1998-07-21
Abstract
Abstract A sieve or screen of the type supported in an inclined position so that a slurry can cascade downwardly over a working surface of the screen is formed with spaced apart, generally parallel rods or wires which extend transversely to the direction of slurry flow; and is characterized in that the means or hardware which secure the rods in spaced apart and parallel relationship are located at the working surface of the screen, as opposed to the traditional practice of locating such hardware at the opposite or underlying surface of the screen.
Inventors
- 👤 Joseph L. Dryden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:07
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
172 words
In a static screen device of the type comprising a screen having a working surface for use in separating the undersized component from the oversized component of a slurry flowing over said working surface, said screen comprising a plurality of rod elements, and support means retaining said rod elements in spaced apart and generally parallel relation to define said working surface and to define slots between said rod elements through which said undersized component passes to escape through the opposite surface of said screen, the improvement wherein the entire said support means is disposed remotely from said opposite surface of said screen sufficiently to minimize the liquid buildup at said opposite surface and thereby promote the efficient passage of the undersized component through said screen; and stationary mounting means is provided for mounting said screen in a fixed position and inclined from end to end whereupon the slurry will flow downwardly over said working surface, with each of said rod elements located generally horizontal and transverse to the direction of slurry flow.
Claim 2
Dependent Claim
172 words
In a static screen device of the type comprising a screen having a working surface for use in separating the undersized component from the oversized component of a slurry flowing over said working surface, said screen comprising a plurality of rod elements, and support means retaining said rod elements in spaced apart and generally parallel relation to define said working surface and to define slots between said rod elements through which said undersized component passes to escape through the opposite surface of said screen, the improvement wherein the entire said support means is disposed remotely from said opposite surface of said screen sufficiently to minimize the liquid buildup at said opposite surface and thereby promote the efficient passage of the undersized component through said screen; and stationary mounting means is provided for mounting said screen in a fixed position and inclined from end to end whereupon the slurry will flow downwardly over said working surface, with each of said rod elements located generally horizontal and transverse to the direction of slurry flow.
Claim 3
Dependent Claim
21 words
The improvement of claim 1 wherein said supporting means comprises members extending generally perpendicular to the axes of said rod elements.
Claim 4
Dependent Claim
14 words
The improvement of claim 2 wherein said members stand upwardly from said working surface.
Claim 5
Dependent Claim
34 words
The improvement of claim 2 wherein said members comprise cross-rods extending generally perpendicular to said rod elements, said rod elements looped outwardly from said working surface about said cross-rods to reenter said working surface.
Claim 6
Dependent Claim
32 words
The improvement of claim 1 wherein said rod elements are generally triangular in cross section and said working surface comprises bases of said triangularly shaped rod elements disposed in generally coplanar relationship.
Claim 7
Dependent Claim
37 words
The improvement of claim 1 wherein said support means is disposed to tend to guide the slurry in the direction of slurry flow and thereby to resist wandering of the slurry to a side of said screen.
Claim 8
Dependent Claim
156 words
In a static sieve for generally separating the undersized and oversized components of a slurry, said static sieve comprising a screen comprising a plurality of rods and support means retaining said rods in spaced apart and generally horizontal relation, said rods cooperatively defining an upper working surface of said screen and an undersurface through which said undersized component drains by passing through the spaces between said rods, the improvement wherein the entire said support means is disposed at said working surface of said screen and is disposed remotely from said undersurface of said screen sufficiently to minimize the liquid buildup at said undersurface and thereby promote the efficient passage of the undersized component through said screen, and stationary means is provided for mounting said screen in a fixed, inclined position so that the slurry will flow downwardly over said working surface, said stationary means mounting said screen with said rods disposed transversely to the slurry flow.
Claim 9
Dependent Claim
156 words
In a static sieve for generally separating the undersized and oversized components of a slurry, said static sieve comprising a screen comprising a plurality of rods and support means retaining said rods in spaced apart and generally horizontal relation, said rods cooperatively defining an upper working surface of said screen and an undersurface through which said undersized component drains by passing through the spaces between said rods, the improvement wherein the entire said support means is disposed at said working surface of said screen and is disposed remotely from said undersurface of said screen sufficiently to minimize the liquid buildup at said undersurface and thereby promote the efficient passage of the undersized component through said screen, and stationary means is provided for mounting said screen in a fixed, inclined position so that the slurry will flow downwardly over said working surface, said stationary means mounting said screen with said rods disposed transversely to the slurry flow.
Claim 10
Dependent Claim
21 words
The improvement of claim 7 wherein said support means comprises bead means extending transversely of said rods along said working surface.
Claim 11
Dependent Claim
31 words
Improvement of claim 7 wherein said rods have generally triangular cross sections, said working surface comprising bases of said rods and each rod having a triangular apex projecting to said undersurface.
Claim 12
Dependent Claim
37 words
The improvement of claim 7 wherein said support means is disposed to tend to guide the slurry in the direction of slurry flow and thereby to resist wandering of the slurry to a side of said screen.
Claim 13
Dependent Claim
161 words
In the method of separating the undersized and oversized components of a slurry by passing the slurry over the upper working surface of a sloped static screen, the steps of providing a screen formed by rod elements and by spacing means for spacing said rod elements apart at said working surface thereof, said spacing means being disposed sufficiently remote from the surface of said screen opposite said working surface to minimize the liquid buildup at said opposite surface and thereby promote the efficient passage of the undersized component through said screen, and said spacing means projecting upwardly from said working surface for dividing said slurry into stream lines and being aligned to cooperate to direct said stream lines of slurry linearly down said screen; providing a mounting for said screen in a fixed, sloped position with said working surface facing generally upwardly and with said rod elements generally transverse to the slurry flow; and flowing the slurry over said working surface.
Claim 14
Dependent Claim
161 words
In the method of separating the undersized and oversized components of a slurry by passing the slurry over the upper working surface of a sloped static screen, the steps of providing a screen formed by rod elements and by spacing means for spacing said rod elements apart at said working surface thereof, said spacing means being disposed sufficiently remote from the surface of said screen opposite said working surface to minimize the liquid buildup at said opposite surface and thereby promote the efficient passage of the undersized component through said screen, and said spacing means projecting upwardly from said working surface for dividing said slurry into stream lines and being aligned to cooperate to direct said stream lines of slurry linearly down said screen; providing a mounting for said screen in a fixed, sloped position with said working surface facing generally upwardly and with said rod elements generally transverse to the slurry flow; and flowing the slurry over said working surface.
Claim 15
Dependent Claim
56 words
The method of claim 11 wherein said rod elements are of generally triangular cross section, and including the step of engaging said spacing means to bases of said rod elements located at said working surface so that the apices of said rod elements opposite said bases provide slots which diverge in progressing away from said bases.
Claim 16
Dependent Claim
122 words
In the separation of undersized from oversized components of a slurry flowing over a static screen, the method of reducing a tendency of an undersized component to cling to the underside of the screen comprising the steps of: providing a screen comprising rod elements spaced apart by spacing means; providing a mounting for said screen in a fixed, inclined position with each of said rod elements extending generally horizontal and transverse to the direction of slurry flow and with the entire said spacing means remote from the underside of said screen sufficiently to minimize the liquid buildup at said underside surface and thereby promote the efficient passage of the undersized component through said screen; and flowing the slurry over said working surface.
Claim 17
Dependent Claim
122 words
In the separation of undersized from oversized components of a slurry flowing over a static screen, the method of reducing a tendency of an undersized component to cling to the underside of the screen comprising the steps of: providing a screen comprising rod elements spaced apart by spacing means; providing a mounting for said screen in a fixed, inclined position with each of said rod elements extending generally horizontal and transverse to the direction of slurry flow and with the entire said spacing means remote from the underside of said screen sufficiently to minimize the liquid buildup at said underside surface and thereby promote the efficient passage of the undersized component through said screen; and flowing the slurry over said working surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |