US4938869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral wound filter element
Assignee: Bay-San Co Inc
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Filing: 1989-07-10
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Granted: 1990-07-03
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Expires: 2009-07-10
Abstract
Abstract A filter element is formed by spirally winding at least two layers of filter material about a central, perforate supporting core. The layers include a relatively fine porous filter material and a relatively coarse porous filter material. The layers may be formed from blankets of material, or one or both layers may be pleated. The fine filter material extends beyond the edge of the coarse filter material to overlie and close the longitudinal ends of the layers of the coarse material. Fluid to be filtered passes radially through the element until it encounters a clogged or plugged area. The fluid will then take a circumferential spiral route until it again finds an open area of the filter and can pass radially toward the core.
Inventors
- 👤 Richard E. Bayerlein
- 👤 Douglas G. Bayerlein
- 👤 William G. Nostrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:49
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D29/50; B01D29/56; B01D29/58; F; F01; F01M; F01M11/00; F01M11/10; B01D2201/00; B01D2201/18; B01D2201/188; Y; Y10; Y10S; Y10S55/00; Y10S55/44
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
147 words
A fluid filter element, comprising: a hollow perforate cylindrical supporting core; a relative fine filtering media of substantially cross section spirally wound about the supporting core with adjacent layer spaced from each other and with the relatively fine filtering media exiting at the core, the fine filtering media accommodating fluid flow for filtering in both a radial and circumferential direction through the cross section and with free access through the cross-section to the core; a relatively coarser filtering material of substantial cross section disposed in the space between the layers of the fine filtering media and with the relatively coarser filtering material exiting at the core, the coarser filtering material accommodating fluid flow for filtering in both a radial and circumferential direction through the cross section and with free access through the cross-section to the core; and means closing the longitudinal ends of the coarser filtering material.
Claim 2
Dependent Claim
147 words
A fluid filter element, comprising: a hollow perforate cylindrical supporting core; a relative fine filtering media of substantially cross section spirally wound about the supporting core with adjacent layer spaced from each other and with the relatively fine filtering media exiting at the core, the fine filtering media accommodating fluid flow for filtering in both a radial and circumferential direction through the cross section and with free access through the cross-section to the core; a relatively coarser filtering material of substantial cross section disposed in the space between the layers of the fine filtering media and with the relatively coarser filtering material exiting at the core, the coarser filtering material accommodating fluid flow for filtering in both a radial and circumferential direction through the cross section and with free access through the cross-section to the core; and means closing the longitudinal ends of the coarser filtering material.
Claim 3
Dependent Claim
21 words
A filter element in accordance with claim 1 wherein the fine filtering media is in the form of a pleated sheet.
Claim 4
Dependent Claim
33 words
A filter element in accordance with claim 2 wherein the coarser filtering material is in the form of a blanket of filter material spirally wound next to the pleated sheet about the core.
Claim 5
Dependent Claim
29 words
A filter element in accordance with claim 2 wherein the coarser filtering material is in the form of a pleated sheet that nests with the fine media pleated sheet.
Claim 6
Dependent Claim
20 words
A filter element in accordance with claim 2 wherein the closing means comprises a substantial thickness of fine filtering media.
Claim 7
Dependent Claim
37 words
A filter element in accordance with claim 1 wherein the fine filtering media and the coarser filtering material are both provided by blankets of filter material laid one upon the other and spirally wound about said core.
Claim 8
Dependent Claim
20 words
A filter element in accordance with claim 6 wherein the closing means comprises a substantial thickness of fine filtering media.
Claim 9
Dependent Claim
148 words
A fluid filter element comprising: a hollow perforate cylindrical supporting core; at least two strati of porous filter material of substantial cross section spirally wound about the supporting core to form a plurality of successive convolute layers, one of said strati being of relatively fine porosity and the other of said strati being of relatively coarse porosity, both of said strati exiting at the core, both of said strati accommodating fluid flow for filtering in both a radial and circumferential direction through the respective cross sections and with free access through the respective cross-sections to the core; and means closing the longitudinal ends of the layers of coarser filter material, whereby fluid will initially pass radially through layers of both strati towards the core until a layer of filter material becomes clogged whereupon fluid will pass circumferentially through an adjacent layer until the fluid encounters an unclogged layer.
Claim 10
Dependent Claim
148 words
A fluid filter element comprising: a hollow perforate cylindrical supporting core; at least two strati of porous filter material of substantial cross section spirally wound about the supporting core to form a plurality of successive convolute layers, one of said strati being of relatively fine porosity and the other of said strati being of relatively coarse porosity, both of said strati exiting at the core, both of said strati accommodating fluid flow for filtering in both a radial and circumferential direction through the respective cross sections and with free access through the respective cross-sections to the core; and means closing the longitudinal ends of the layers of coarser filter material, whereby fluid will initially pass radially through layers of both strati towards the core until a layer of filter material becomes clogged whereupon fluid will pass circumferentially through an adjacent layer until the fluid encounters an unclogged layer.
Claim 11
Dependent Claim
26 words
A filter element in accordance with claim 8 wherein the relatively coarse filter material is wood excelsior and the relatively fine filter material comprises cotton waste.
Claim 12
Dependent Claim
19 words
A filter element in accordance with claim 8 wherein said closing means comprises the stratum of relatively fine porosity.
Claim 13
Dependent Claim
117 words
A fluid filter element comprising: a hollow perforate cylindrical supporting core; and two blankets of porous filter material spirally wound about the supporting core to form a plurality of successive layers, one of said blanket being of relatively fine porosity and the other of said blankets being of relatively coarse porosity: both of said blankets having a substantial cross section and both accommodating fluid flow for filtering in both a radial and circumferential direction through the respective cross sections; the blanket of relatively fine filter material extending beyond the longitudinal edges of the blanket of relatively coarse filter material to overlie the same to thereby close the longitudinal ends of the layers of relatively coarse filter material.
Claim 14
Dependent Claim
117 words
A fluid filter element comprising: a hollow perforate cylindrical supporting core; and two blankets of porous filter material spirally wound about the supporting core to form a plurality of successive layers, one of said blanket being of relatively fine porosity and the other of said blankets being of relatively coarse porosity: both of said blankets having a substantial cross section and both accommodating fluid flow for filtering in both a radial and circumferential direction through the respective cross sections; the blanket of relatively fine filter material extending beyond the longitudinal edges of the blanket of relatively coarse filter material to overlie the same to thereby close the longitudinal ends of the layers of relatively coarse filter material.
Claim 15
Dependent Claim
23 words
A filter element in accordance with claim 11 together with a thin carrier sheet of unwoven fiber spirally wound with the two blankets.
Claim 16
Dependent Claim
60 words
A fluid filter element, comprising: a hollow perforate cylindrical supporting core; a pleated sheet of relatively fine filtering media spirally wound about the supporting core with adjacent layers spaced from each other; a relatively coarse porous filter material disposed in the space between the layers of fine filtering media; and means closing the longitudinal ends of the coarse porous material.
Claim 17
Dependent Claim
60 words
A fluid filter element, comprising: a hollow perforate cylindrical supporting core; a pleated sheet of relatively fine filtering media spirally wound about the supporting core with adjacent layers spaced from each other; a relatively coarse porous filter material disposed in the space between the layers of fine filtering media; and means closing the longitudinal ends of the coarse porous material.
Claim 18
Dependent Claim
24 words
A fluid filter in accordance with claim 13 wherein the coarse filter material is in the form of a pleated sheet of filter material.
Claim 19
Dependent Claim
90 words
A fluid filter element, comprising: a hollow perforate cylindrical support core; a blanket of relatively fine filtering media of substantial cross section spirally would about the support core with adjacent layers spaced from each other and with the blanket closing the longitudinal ends of the spaces between layers; and a relatively coarse porous filter media of substantial cross section disposed in the space between the layers of fine filtering media; both filter media accommodating fluid flow for filtering in both a radial and circumferential direction through the respective cross sections.
Claim 20
Dependent Claim
90 words
A fluid filter element, comprising: a hollow perforate cylindrical support core; a blanket of relatively fine filtering media of substantial cross section spirally would about the support core with adjacent layers spaced from each other and with the blanket closing the longitudinal ends of the spaces between layers; and a relatively coarse porous filter media of substantial cross section disposed in the space between the layers of fine filtering media; both filter media accommodating fluid flow for filtering in both a radial and circumferential direction through the respective cross sections.
References Cited (Backward Citations)
US1742743A
Cited
US1861576A
Cited
US1805903A
Cited
US1951484A
Cited
US2427733A
Cited
US2478109A
Cited
US2647637A
Cited
US3063888A
Cited
US3095370A
Cited
US3356227A
Cited
US3468425A
Cited
US3827562A
Cited
US4032688A
Cited
US4083780A
Cited
US4233042A
Cited
US4187136A
Cited
GB2047107A
Cited
US4241787A
Cited
US4296810A
Cited
US4411791A
Cited
US4425239A
Cited
US4604205A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |