US5792228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accordion filter pack that is bendable in only one direction
Assignee: Carl Freudenberg KG
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Filing: 1996-10-10
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Granted: 1998-08-11
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Expires: 2016-10-10
Abstract
Abstract An accordion filter pack that is bendable in only one direction and is made of a flexible filter medium, the folds of which are capped in the lateral direction at both ends by a flexible sealing strip and which can be sealed by the sealing strip with respect to a housing. The accordion filter pack is joined on its longitudinal sides to a least one reinforcing element. The reinforcing element is joined to the sealing strip and consists of a flat, flexible planar structure that extends transversely to the openings of the folds.
Inventors
- 👤 Jurgen Fath
- 👤 Harald Betz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:50
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D29/00; B01D29/01; B01D29/05; B01D29/07; B01D39/00; B01D39/14; B01D39/16; B01D46/52; B01D46/521; B01D46/523; B01D2275/00; B01D2275/20; B01D2275/203
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
An accordion filter pack that is bendable in only one direction, comprising: a flexible filter medium having two longitudinal sides and folds extending therebetween in a lateral direction: two reinforcing elements each comprising a flat, flexible planar structure that extends transversely to the openings of the folds, one such reinforcing element being joined onto each of the longitudinal sides of the flexible filter medium in a manner that divides the sides into two longitudinally extending unequal portions, thereby permitting the filter pack to bend in only one direction; and a flexible sealing strip mounted onto each of the reinforcing elements so that the sealing strip can seal the reinforcing element against a housing.
Claim 2
Dependent Claim
113 words
An accordion filter pack that is bendable in only one direction, comprising: a flexible filter medium having two longitudinal sides and folds extending therebetween in a lateral direction: two reinforcing elements each comprising a flat, flexible planar structure that extends transversely to the openings of the folds, one such reinforcing element being joined onto each of the longitudinal sides of the flexible filter medium in a manner that divides the sides into two longitudinally extending unequal portions, thereby permitting the filter pack to bend in only one direction; and a flexible sealing strip mounted onto each of the reinforcing elements so that the sealing strip can seal the reinforcing element against a housing.
Claim 3
Dependent Claim
22 words
An accordion filter pack as defined in claim 1, wherein the planar structure reinforcing element is made of a nonwoven mat material.
Claim 4
Dependent Claim
25 words
An accordion filter pack as defined in claim 1, wherein the planar structure of the reinforcing element comprises of a film made of thermoplastic material.
Claim 5
Dependent Claim
24 words
The accordion filter pack as defined in claim 1, wherein the sealing strip prevents fluid from moving between the reinforcing element and the filter.
Claim 6
Dependent Claim
24 words
The accordion filter pack as defined in claim 2, wherein the sealing strip prevents fluid from moving between the reinforcing element and the filter.
Claim 7
Dependent Claim
24 words
The accordion filter pack as defined in claim 3, wherein the sealing strip prevents fluid from moving between the reinforcing element and the filter.
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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) | 2001-08-10 | 2002-02-09 | 2002-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-10 | 2006-02-09 | 2006-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-10 | 2010-02-09 | 2010-08-11 | $7700.00 | Window Closed / Lapsed |