US3853529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pleated air filter cartridge
Assignee: Farr Co
•
Filing: 1971-06-09
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Granted: 1974-12-10
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Expires: 1991-06-09
Abstract
Abstract A disposable filter cartridge for mounting in an air inlet duct is manufactured from inexpensive materials according to a relatively rapid and automated method. A web of wire supports secured to one side of a flexible sheet of filtering media is folded and cut to form a plurality of panels of pleated filtering media having an integral support structure. The completed cartridge consists of a panel mounted in a frame with the sides and edges of the filtering media sealed to the frame to prevent a by-pass of air therebetween.
Inventors
- 👤 R Farr
- 👤 C Boothe
- 👤 R Culbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:27
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/523; B01D46/0001; B01D46/0084; B01D46/0091; B01D46/0093; B01D46/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
A disposable filter cartridge for mounting an air inlet duct, comprising: a frame for mounting in the air inlet duct; a filter panel mounted on said frame and extending thereacross, said panel including a flexible sheet of pleated filtering material and a corresponding pleated support web adhesively joined to said filtering material; said web including a plurality of spaced sinuous wire supports and a plurality of spaced straight wire supports connected to said sinuous wire supports and forming plurality of apertures therebetween; said sinuous wire supports extending across said pleats of said filtering material and coinciding therewith to provide lateral support thereto and said straight wire supports extending along said pleats of said filtering material and transversing said sinuous wire supports to provide longitudinal support thereto; and said straight wire supports positioned between said filtering material and said sinuous wire supports (at said connection therewith) whereby said more rigid sinuous wire supports maintain said less rigid sinuous wire supports in position against said filtering material.
Claim 2
Dependent Claim
165 words
A disposable filter cartridge for mounting an air inlet duct, comprising: a frame for mounting in the air inlet duct; a filter panel mounted on said frame and extending thereacross, said panel including a flexible sheet of pleated filtering material and a corresponding pleated support web adhesively joined to said filtering material; said web including a plurality of spaced sinuous wire supports and a plurality of spaced straight wire supports connected to said sinuous wire supports and forming plurality of apertures therebetween; said sinuous wire supports extending across said pleats of said filtering material and coinciding therewith to provide lateral support thereto and said straight wire supports extending along said pleats of said filtering material and transversing said sinuous wire supports to provide longitudinal support thereto; and said straight wire supports positioned between said filtering material and said sinuous wire supports (at said connection therewith) whereby said more rigid sinuous wire supports maintain said less rigid sinuous wire supports in position against said filtering material.
Claim 3
Dependent Claim
20 words
The filter cartridge of claim 1, wherein said support web is secured to the downstream side of said filtering material.
Claim 4
Dependent Claim
33 words
The filter cartridge of claim 1, wherein said wire supports are metallic to provide a fire-resistant support web and said support web is completely coated with a protective coating to be rust resistant.
Claim 5
Dependent Claim
46 words
The filter cartridge of claim 1, wherein said sinuous wire supports each include alternately spaced bends which are more acute than the intervening adjacent bends whereby said filtering material secured to said sinuous wire supports includes corresponding acute upstream pleats and corresponding less acute downstream pleats.
Claim 6
Dependent Claim
30 words
The combination of claim 1 wherein said sinuous wire support and said straight wire support define a plurality of apertures along each of said pleats defined by said filter panel.
Claim 7
Dependent Claim
47 words
The filter cartridge of claim 1 wherein each of said sinuoUs wire supports has alternately spaced more acute bends than the intervening adjacent bends whereby said upstream pleats of said panel are more acute than said downstream pleats to enhance the collecting capacity of the filter cartridge.
Claim 8
Dependent Claim
31 words
The filter cartridge of claim 1, wherein said filtering material is secured to said wire supports around each said aperture to prevent a billowing of said filtering material through said apertures.
Claim 9
Dependent Claim
26 words
The filter cartridge of claim 7, wherein said filtering material and said wire supports are secured by an adhesive seal extending completely around each said aperture.
Claim 10
Dependent Claim
46 words
The filter cartridge of claim 8, wherein said sinuous wire supports and said straight wire supports are spaced sufficiently close together to provide the necessary support for said filtering material and form sufficiently large apertures to prevent said adhesive from bridging thereacross and clogging said apertures.
Claim 11
Dependent Claim
36 words
The filter cartridge of claim 1, wherein said sinuous wire supports are equally spaced and parallel and said straight wire supports are equally spaced and parallel and connect at right angles to said sinuous wire supports.
Claim 12
Dependent Claim
39 words
The filter cartridge of claim 10, wherein certain of said straight wire supports are connected at the peaks of said sinuous wire supports and said other straight wire supports are connected at the valleys of said sinuous wire supports.
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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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |