Patent US4145196A successfully refreshed from Google Patents.
US4145196A
Expired / Lapsed
US
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Filter element
Assignee: Lectrostatic AB
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Filing: 1977-09-22
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Granted: 1979-03-20
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Expires: 1997-09-22
Abstract
Abstract A filter element having a bag of filter medium surrounded by an elastic net hose with a corrugated wall interposed therebetween.
Inventors
- 👤 Magnus Alskog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:38
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/14; B; B01; B01D; B01D46/00; B01D46/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
123 words
In a filter element intended to operate at high, pulsating pressure and including a hose-like filter means made of fibrous material, an inlet to the interior for supplying contaminated air and a wall through which purified air departs, the filter means surrounded by a net-like, elastic hose-like member, the improvement comprising; the length of the filter means and the circumference of said means in the expanded state of said means exceed the length and circumference of the net-like hose-like member, a corrugated wall interposed between said filter member and said hose-like member, the filter means arranged in folds abutting the corrugated wall, said corrugations extending in the longitudinal direction of the filter means, and said filter means held compressed by said hose-like member.
Claim 2
Dependent Claim
123 words
In a filter element intended to operate at high, pulsating pressure and including a hose-like filter means made of fibrous material, an inlet to the interior for supplying contaminated air and a wall through which purified air departs, the filter means surrounded by a net-like, elastic hose-like member, the improvement comprising; the length of the filter means and the circumference of said means in the expanded state of said means exceed the length and circumference of the net-like hose-like member, a corrugated wall interposed between said filter member and said hose-like member, the filter means arranged in folds abutting the corrugated wall, said corrugations extending in the longitudinal direction of the filter means, and said filter means held compressed by said hose-like member.
Claim 3
Dependent Claim
33 words
A filter element according to claim 1, wherein the filter means has a bottom remote from said inlet; and the pressure-absorbing hose-like member has a bottom abutting said bottom of said filter means.
Claim 4
Dependent Claim
21 words
A filter element as claimed in claim 1, wherein the inner surface of the net-like, hose-like member abuts said corrugated wall.
References Cited (Backward Citations)
US1148237A
Cited
GB104842A
Cited
US2514280A
Cited
US2800194A
Cited
US3326382A
Cited
US3364663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-19 | 1982-09-18 | 1983-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-19 | 1986-09-18 | 1987-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-19 | 1990-09-18 | 1991-03-20 | $7700.00 | Window Closed / Lapsed |