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US3877909A
Expired / Lapsed
US
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Internally self-supporting filter and process for making same
Assignee: VICKSON-AIRE Corp 410 WINIFIELD AVE SALISBURY MD A CORP
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Filing: 1974-04-23
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Granted: 1975-04-15
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Expires: 1994-04-23
Abstract
Abstract An internally supported, composite frameless filter is disclosed and includes the following: 1. Two or more fluid permeable filter members having substantially the same peripheral shape; 2. A thin, wire-like frame member positioned between the filter members and spaced inwardly from the periphery thereof; 3. The first of the filter members being the upstream filter layer made of a relatively thick, low density, medium or long filament puffed glass fiber layer; the second of the filter members being the downstream filtering layer and being made of a thin, relatively high density, non-woven fibrous layer; 4. An anti-bulge device including localized compression discs centrally positioned on both sides of the composite filter compressively sandwiching the filter members therebetween, the compression discs being rigidly attached to each other through the filter members; and 5. Each of the filter members is adhesively secured to the frame member and is uncompacted throughout its entire thickness, except in the area of the anti-bulge device.
Inventors
- 👤 Elwood F Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
153 words
Internally supported composite frameless filter comprising: a. at least two fluid permeable filter members having substantially the same peripheral shape; b. a thin wire-like frame member positioned between said filter members and spaced inwardly from the periphery thereof; c. the first of said filter members being the upstream filter layer and comprising a relatively thick, low density, medium to long filament puffed glass fiber layer; d. the second of said filter members being the downsteam filtering layer and comprising a thin, rElatively high density, non-woven, fibrous layer; e. anti-bulge means including localized compression means centrally positioned on both sides of the composite filter compressively sandwiching said filter members therebetween, said compression means being rigidly attached to each other through said filter members; and f. each of said filter members being adhesively secured to said frame member and being uncompacted throughout each of their entire thicknesses except in the area of said anti-bulge means.
Claim 2
Dependent Claim
153 words
Internally supported composite frameless filter comprising: a. at least two fluid permeable filter members having substantially the same peripheral shape; b. a thin wire-like frame member positioned between said filter members and spaced inwardly from the periphery thereof; c. the first of said filter members being the upstream filter layer and comprising a relatively thick, low density, medium to long filament puffed glass fiber layer; d. the second of said filter members being the downsteam filtering layer and comprising a thin, rElatively high density, non-woven, fibrous layer; e. anti-bulge means including localized compression means centrally positioned on both sides of the composite filter compressively sandwiching said filter members therebetween, said compression means being rigidly attached to each other through said filter members; and f. each of said filter members being adhesively secured to said frame member and being uncompacted throughout each of their entire thicknesses except in the area of said anti-bulge means.
Claim 3
Dependent Claim
15 words
Composite filter of claim 1 wherein said second filter member is other than glass fiber.
Claim 4
Dependent Claim
23 words
Composite filter of claim 1 wherein the glass fiber layer comprises at least about 55% of the overall thickness of the composite filter.
Claim 5
Dependent Claim
25 words
Composite filter of claim 1 wherein said glass fiber layer comprises from about 85 to about 95% of the overall thickness of the composite filter.
Claim 6
Dependent Claim
27 words
Composite filter of claim 1 wherein said filter members are adhesively secured to said frame member by a hot melt adhesive coated on the said frame member.
Claim 7
Dependent Claim
15 words
Composite filter of claim 1 wherein said second filter member is a fibrous polyester layer.
Claim 8
Dependent Claim
28 words
Composite filter of claim 1 wherein said second fibrous layer is sufficiently dense to trap very fine particulate solid matter, entrained in a fluid flowing through said layer.
Claim 9
Dependent Claim
24 words
Composite filter of claim 1 wherein said frame member is spaced about three-eighths of an inch in from the periphery of said filter members.
Claim 10
Dependent Claim
32 words
Composite filter of claim 1 wherein said second filter member is a relatively rigid medium or long filament glass fiber layer with the filaments thereof predominately oriented in the same general direction.
Claim 11
Dependent Claim
32 words
Composite filter of claim 1 wherein the anti-bulge means compresses the puffed glass layer down to the rigid glass fiber layer which remains substantially in the same plane as the frame member.
Claim 12
Dependent Claim
43 words
Composite filter of claim 1 wherein said second filter member is made up of two of said rigid glass fiber layers with said frame member positioned therebetween and adhesively, secured thereto, said first filter member being adhesively attached to said second filter member.
Claim 13
Dependent Claim
33 words
Composite filter of claim 1 wherein a third filter member is positioned between said filter members, said third filter member having a density intermediate the density of said first and second filter members.
Claim 14
Dependent Claim
34 words
Internally supported composite frameless filter comprising at least two composite filters of claim 1 in side by side alignment wherein the second filter member is integral and common to individual, adjacent first filter elements.
Claim 15
Dependent Claim
33 words
Internally supported composite frameless filter comprising at least two composite filters of claim 1 in side by side alignment wherein the wire-like frame members of adjacent composite filters are interconnected with one another.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |