US3757499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stiffened absolute filter pack
Assignee: HEPA Corp
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Filing: 1971-11-04
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Granted: 1973-09-11
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Expires: 1991-11-04
Abstract
Abstract An absolute filter pack in which a thin wall plastic frame is used with a filter element. Additional support is provided intermediate the filter element ends by support members inserted in place of the usual spacers, whereby the fiberglass web filter is continuous across the frame opening and relatively more filter area is made available and seal points are reduced in comparison with subdivided filter packs.
Inventors
- 👤 R Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:13
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/10; B01D2265/00; B01D2265/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A relatively elongated absolute filter pack comprising a filter element and a frame extending circumferentially thereof, aid filter element comprising an axially compressed filter assembly of a transversely pleated fiberglass web and elongated transversely corrugated spacers between adjacent web pleats, said filter assembly being secured at its perimeter to the frame walls; and plural support members located intermediate the filter element ends within the web pleats and in place of certain of said spacers normally occupying said pleats, said support members being formed of rigid plastic or wood and sized to abut opposing frame side walls and secured there to support the filter assembly in the frame jointly with said frame walls, while stiffening the frame.
Claim 2
Dependent Claim
116 words
A relatively elongated absolute filter pack comprising a filter element and a frame extending circumferentially thereof, aid filter element comprising an axially compressed filter assembly of a transversely pleated fiberglass web and elongated transversely corrugated spacers between adjacent web pleats, said filter assembly being secured at its perimeter to the frame walls; and plural support members located intermediate the filter element ends within the web pleats and in place of certain of said spacers normally occupying said pleats, said support members being formed of rigid plastic or wood and sized to abut opposing frame side walls and secured there to support the filter assembly in the frame jointly with said frame walls, while stiffening the frame.
Claim 3
Dependent Claim
21 words
Absolute filter pack according to claim 1 in which said pack frame is rectangular and said filter assembly is congruent therewith.
Claim 4
Dependent Claim
16 words
Absolute filter pack according to claim 1 in which the filter assembly spacers are metal strips.
Claim 5
Dependent Claim
21 words
Absolute filter pack according to claim 1 in which said support members are equidistant from each other and said end walls.
Claim 6
Dependent Claim
39 words
Absolute filter pack according to claim 1 in which said frame is molded plastic and has sidewalls which are flexible between the frame end walls and in which said support members are located to resist flexure of said sidewalls.
Claim 7
Dependent Claim
102 words
An absolute filter pack comprising a rectangular filter element and a molded synthetic organic plastic rectangular frame having end walls and side walls extending around and sealably secured to said filter element, said filter element comprising an axially compressed filter assemly of a transversely pleated fiberglass web extending uninterruptedly across the open face width of said frame and elongated, transversely corrugated metal spacers between adjacent web pleats, and support members comprising rigid plastic inserts located within certain intermediate pleats parallel to the frame end walls and in abutting engagement with opposite frame side walls to support said assembly sand said frame together.
Claim 8
Dependent Claim
102 words
An absolute filter pack comprising a rectangular filter element and a molded synthetic organic plastic rectangular frame having end walls and side walls extending around and sealably secured to said filter element, said filter element comprising an axially compressed filter assemly of a transversely pleated fiberglass web extending uninterruptedly across the open face width of said frame and elongated, transversely corrugated metal spacers between adjacent web pleats, and support members comprising rigid plastic inserts located within certain intermediate pleats parallel to the frame end walls and in abutting engagement with opposite frame side walls to support said assembly sand said frame together.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |