Patent US3791111A successfully refreshed from Google Patents.
US3791111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter device
Assignee: Individual
•
Filing: 1973-04-30
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Granted: 1974-02-12
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Expires: 1993-04-30
Abstract
Abstract A gas filtering device in which a series of filter units are arranged parallely within a housing. Each filter unit comprises a frame about which fabric filter is wrapped to form parallel sides, thereby providing a filter pocket. The filter units are inserted into a casing through slots in a casing wall. The free edge of the filter fabric is wound around a sealing ring so as to form a welt. A sheet metal cover strip closes the open front side of each frame, clamps the welt against the casing wall at the slot edges, and this cover has a tubular connector disposed outside of the housing and affording sole access to the filter pocket.
Inventors
- 👤 G Kroll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 01:50
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/42; B01D46/4227; B01D46/66; B01D46/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
A filtering device comprising a casing, means for feeding dust laden air to the interior of the casing, means at the bottom of the casing for collecting dust, said casing having a wall with a plurality of slots therein, a plurality of filter units insertable into and removable from said casing through said slots, each comprising a U-frame, a fabric filter bag stretched over the U-frame, a strip having a clean air nozzle passage, means securing the free ends of the U-frame to the strip, said strip normally closing the open end of the filter bag and the free edges of the bag engaging between the strip and the outer side of the casing wall surrounding a slot, and means for forcing said strips towards the outer side of said casing wall so as to clamp the free edges of said filter bags therebetween.
Claim 2
Dependent Claim
144 words
A filtering device comprising a casing, means for feeding dust laden air to the interior of the casing, means at the bottom of the casing for collecting dust, said casing having a wall with a plurality of slots therein, a plurality of filter units insertable into and removable from said casing through said slots, each comprising a U-frame, a fabric filter bag stretched over the U-frame, a strip having a clean air nozzle passage, means securing the free ends of the U-frame to the strip, said strip normally closing the open end of the filter bag and the free edges of the bag engaging between the strip and the outer side of the casing wall surrounding a slot, and means for forcing said strips towards the outer side of said casing wall so as to clamp the free edges of said filter bags therebetween.
Claim 3
Dependent Claim
41 words
The combination claimed in claim 1, the means for forcing said strips towards the outer side of the casing wall comprising a plurality of bars engaging across the strips, and clamp screw means engaging between said bars and said casing wall.
Claim 4
Dependent Claim
34 words
The combination claimed in claim 1, the free edge of each filter bag being turned over a sealing ring which, together with said free edge, is clamped between a strip and said casing wall.
References Cited (Backward Citations)
US3421295A
Cited
US3377783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |