US5141540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-profile filtration module
Assignee: Clestra Cleanroom SA
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Filing: 1992-02-11
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Granted: 1992-08-25
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Expires: 2012-02-11
Abstract
Abstract This low-profile filtration module has a blower partially occupying an equalization chamber above a standard filter unit. A diffuser plate is interposed between the filter and the equalization chamber, and has a plurality of openings elongated in a direction perpendicular to the planes of the filter pleats. The density of the openings is increased at the portions of the equalization chamber where the space for lateral air flow is decreased by the presence of the blower.
Inventors
- 👤 Martin C. Helmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:52
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/10; F; F24; F24F; F24F8/00; F24F8/10; F24F8/108; B01D2273/00; B01D2273/30; B01D2279/00; B01D2279/50; B01D2279/51
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
An air filtration module including a housing providing a receptacle for a standard replaceable filter unit having pleats in the upper surface thereof, and a pressure chamber normally above said receptacle, and also including a perforated diffuser plate interposed between said pressure chamber and receptacle, and blower means having a discharge opening into said pressure chamber, wherein the improvement comprises: a configuration of said diffuser plate, wherein a plurality of perforations are provided which are elongated in a direction transverse to said pleats.
Claim 2
Dependent Claim
83 words
An air filtration module including a housing providing a receptacle for a standard replaceable filter unit having pleats in the upper surface thereof, and a pressure chamber normally above said receptacle, and also including a perforated diffuser plate interposed between said pressure chamber and receptacle, and blower means having a discharge opening into said pressure chamber, wherein the improvement comprises: a configuration of said diffuser plate, wherein a plurality of perforations are provided which are elongated in a direction transverse to said pleats.
Claim 3
Dependent Claim
56 words
A module as defined in claim 1, wherein said perforations are disposed in a pattern of differential density between various parts of said plate, said pattern being selected to establish substantially equal flow into said filter unit over its entire upper surface, and compensate for the effects of flow patterns and constrictions within said pressure chamber.
Claim 4
Dependent Claim
30 words
A module as defined in claim 1, wherein said perforations are each between three sixteenths and one half an inch in width, and between one and two inches in length.
Claim 5
Dependent Claim
32 words
A module as defined in claim 3, wherein said perforations are arranged in parallel rows, and said differential density is provided by variations in the number of said perforations in said rows.
Claim 6
Dependent Claim
41 words
A module as defined in claim 1, wherein said blower means has a shroud extending into said pressure chamber and establishing a portion of decreased space above said diffuser plate, said perforations being disposed at increased density opposite said decreased space.
References Cited (Backward Citations)
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |