US4225328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exchangeable filter element
Assignee: Delbag Luftfilter GmbH
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Filing: 1978-10-23
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Granted: 1980-09-30
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Expires: 1998-10-23
Abstract
Abstract An exchangeable filter element is disclosed. The filter element is especially adapted for nuclear installations for the purification of gas streams which contain toxic or radioactive matter. A method is also disclosed for the exchange and disposal of contaminated filter elements, which filter elements are reducible in volume for packing into waste containers.
Inventors
- 👤 Hans-Henrich Stiehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:51
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/0002; B01D46/0084; B01D46/0091; B01D46/0094; B01D46/02; B01D46/023; B01D46/12; B01D46/121; B01D46/52; B01D46/521; G; G21; G21F; G21F9/00; G21F9/02; Y; Y10; Y10S; Y10S55/00; Y10S55/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
An exchangeable filter element especially for nuclear installations for the purification of gas streams which contain toxic or radioactive matter, said filter element comprising a rigid frame closed on all sides and adapted to be inserted into a filter housing, said filter element further comprising a filter element for removing suspended matter; means sealing said filter element in said frame, said filter element being removable from said frame, said filter element being reduced in volume by means of pressure after said removal, said filter element further comprising a plurality of individual, V-shaped filter pockets which are arranged side by side, said filter pockets having flanges surrounding the open sides of these filter pockets and being removable, said flanges of all V-shaped pockets being gas tight and enclosed by a common encirculating mounting frame, which mounting frame consists of elastic breakable material, the encirculating edge of which mounting frame being tightly insertable in the housing which serves to receive the filter and where the filter pockets are freely suspended.
Claim 2
Dependent Claim
168 words
An exchangeable filter element especially for nuclear installations for the purification of gas streams which contain toxic or radioactive matter, said filter element comprising a rigid frame closed on all sides and adapted to be inserted into a filter housing, said filter element further comprising a filter element for removing suspended matter; means sealing said filter element in said frame, said filter element being removable from said frame, said filter element being reduced in volume by means of pressure after said removal, said filter element further comprising a plurality of individual, V-shaped filter pockets which are arranged side by side, said filter pockets having flanges surrounding the open sides of these filter pockets and being removable, said flanges of all V-shaped pockets being gas tight and enclosed by a common encirculating mounting frame, which mounting frame consists of elastic breakable material, the encirculating edge of which mounting frame being tightly insertable in the housing which serves to receive the filter and where the filter pockets are freely suspended.
Claim 3
Dependent Claim
144 words
The filter element defined in claim 1 characterized by the fact that the filter pockets show two layers of filter paper which has been folded in a zig-zag fashion and which shows a thickness of ten to forty milimeters and which filter pockets have edges which form the open sides of the pockets embedded in and sealed to the flanges and are sealed by a common seal at their opposite edges which touch each other; and that the side areas of the filter pockets are closed by means of a V-shaped support which has been filled with a plastic material, and which V-shaped support consists of a piece of metal or a piece of cardboard or a sheet of plastic or other material, which V-shaped support is tightly embedded into the flange of the pocket and which closes the edges of both filter layers.
Claim 4
Dependent Claim
69 words
The filter element defined in claim 2 characterized by the fact that the filter layers of the filter pockets are equipped at their outer sides and at their inner sides, each with one perforated protective cover consisting of a perforated sheet of steel or similar material, the edges of which protective cover are embedded into the sealant of the flanges and of the V-shaped supports by means of bends.
Claim 5
Dependent Claim
36 words
The filter element in claim 1 characterized by the fact that the touching edges of the flanges of the V-shaped filter pockets are connected with adhesive tape, which adhesive tape is equipped with a tear strip.
Claim 6
Dependent Claim
34 words
The filter element in claim 1 characterized by the fact that the flanges of the V-shaped filter pockets contact one another to form recessed, V-shaped separating seams which are filled with an elastic sealant.
Claim 7
Dependent Claim
62 words
The filter element defined in claim 1 characterized by the fact that the receiving frame of the filter element is shaped in the form of a structural frame box which is opened on both sides, and the front of which structural frame box can be flipped down and can be locked in position for the purpose of insertion of the filter element.
Claim 8
Dependent Claim
64 words
The filter element as defined in claim 1 characterized by the fact that the receiving frame consists of a frame which is opened on all sides, has the shape of a box and is made of structural material, and the upper frontal structural connection of which frame can be flipped down sideways and can be locked in position for the insertion of the element.
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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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |