US3985654A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter assembly for fluid polymeric material
Assignee: Pall Corp
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Filing: 1974-12-10
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Granted: 1976-10-12
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Expires: 1994-12-10
Abstract
Abstract A filter assembly is provided for filtering fluid polymeric material, and having a filter element composed of a sheet of filter material formed in a closed configuration defining therewithin the sides of a chamber open at each end; a first closure member having a sealing surface engaging in a fluid-tight seal one end of the filter sheet at such surface under compression by fluid polymeric material, and having at least one fluid passage therethrough in communication with the chamber; and a second closure member having a sealing surface engaging in a fluid-tight seal the other end of the filter sheet at such surface under compression by fluid polymeric material, and having a pressure-receiving surface upstream of the filter element responsive to relatively higher upstream differential pressure of fluid polymeric material to press the sealing surfaces of the first and second closure members into fluid-tight sealing relationship with the ends of the filter sheet so that the higher the differential pressure of fluid polymeric material across the filter element, the higher the pressure at the seal, and the tighter the seal.
Inventors
- 👤 David Boris Pall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:04
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/10; D01D1/106; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/50; B01D29/52; B01D29/54
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A filter assembly for filtering viscous fluid polymeric material under pressure, said assembly comprising a sheet of filter material defining the sidewall of a first chamber therewithin, open at each end; first closure means with an opening therethrough extending across one open end of said chamber, the opening providing an outlet therefrom; means constructed and arranged around the peripheral edge of said closure means providing a sealing surface for said filter sheet end at said chamber one end, said means further being arranged to extend upwardly and outwardly therefrom to define a second chamber outside said sheet of filter material and second closure means loosely engaged in sealing relationship with the opposite filter end, and closing off the other end of said chamber; whereby fluid under pressure against said closure means is directed into said second chamber for filtering and said pressure sealingly engages the filter ends against the first and second closure means.
Claim 2
Dependent Claim
154 words
A filter assembly for filtering viscous fluid polymeric material under pressure, said assembly comprising a sheet of filter material defining the sidewall of a first chamber therewithin, open at each end; first closure means with an opening therethrough extending across one open end of said chamber, the opening providing an outlet therefrom; means constructed and arranged around the peripheral edge of said closure means providing a sealing surface for said filter sheet end at said chamber one end, said means further being arranged to extend upwardly and outwardly therefrom to define a second chamber outside said sheet of filter material and second closure means loosely engaged in sealing relationship with the opposite filter end, and closing off the other end of said chamber; whereby fluid under pressure against said closure means is directed into said second chamber for filtering and said pressure sealingly engages the filter ends against the first and second closure means.
Claim 3
Dependent Claim
29 words
A filter assembly in accordance with claim 1, in which one of the first and second closure means has a porous wall defining a support for the filter sheet.
Claim 4
Dependent Claim
19 words
A filter assembly in accordance with claim 2, in which the porous wall is integral with the closure means.
Claim 5
Dependent Claim
19 words
A filter assembly in accordance with claim 2, in which the porous wall has a plurality of passages therethrough.
Claim 6
Dependent Claim
16 words
A filter assembly in accordance with claim 1, in which the filter sheet is wire mesh.
Claim 7
Dependent Claim
22 words
A filter assembly in accordance with claim 1, in which the first and second closure means are concentric with the filter sheet.
Claim 8
Dependent Claim
82 words
A filter assembly in accordance with claim 1, in which the first closure means has a recess receiving one end of the filter sheet and a sealing surface constituting one wall of the recess, engaging the edge of the filter sheet at that end; and the second closure means has a recess receiving the other end of the filter sheet and a sealing surface constituting one wall of the recess and engaging the edge of the filter sheet at said other end.
Claim 9
Dependent Claim
36 words
A filter assembly in accordance with claim 1, in which the second closure means is a solid plate, fitting within the chamber defined by the filter sheet, with one external face serving as the pressure-receiving surface.
Claim 10
Dependent Claim
71 words
A filter assembly in accordance with claim 8, in which the filter sheet is in cylindrical corrugated form, and the second closure means fills in substantially all of the chamber defined within the filter sheet, with a porous wall serving as a supporting internal core for the filter sheet defining with the remainder of the closure means at least one chamber for reception of filtered fluid passing through the filter sheet.
Claim 11
Dependent Claim
88 words
A filter assembly in accordance with claim 1, having a plurality of concentric filter sheets and a plurality of concentric second closure means, each having a sealing surface engaging one end of the filter sheet of such concentric filter sheets under pressure of filter polymeric material in fluid-tight seal, and having a pressure receiving surface upstream of the filter sheets responsive to higher upstream differential pressure of fluid polymeric material to press the sealing surfaces into fluid-tight relationship with the ends of the filter sheets in contact therewith.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |