Patent US5129929A successfully refreshed from Google Patents.
US5129929A
Expired / Lapsed
US
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Sorbent filtration device
Assignee: Pall Corp
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Filing: 1990-12-18
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Granted: 1992-07-14
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Expires: 2010-12-18
Abstract
Abstract A sorbent filter pad for removing undesirable gases from an air flow is described. The pad has two major surfaces with one formed into a series of parallel ridges such that the thickness of the pad varies along a direction perpendicular to the ridges. In a preferred combination the sorbent pad is combined with a pleated particulate filter element such that the ridges occupy the pleat hollows on the downstream side of the particulate filter.
Inventors
- 👤 Staffan B. Linnersten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:31
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28042; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2082; B01D46/00; B01D46/10; B01D53/00; B01D53/02; B01D53/04; B01D53/0407; B01J20/28033; B01D2253/00; B01D2253/10; B01D2253/102; B01D2253/104; B01D2253/106; B01D2253/25; B01D2258/00; B01D2258/02; B01D2258/0225; B01D2259/00; B01D2259/45; B01D2259/4583; B01D53/0446; B01D53/0454
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A sorbent filter structure comprising a pleated particulate filter element, having essentially parallel pleat axes, and a sorbent pad in the form of a flat base for sorbing undesirable gases, said pad having two major surfaces, the first being planar and the second having formed on it a plurality of spaced parallel ridges, said pad being further constructed and positioned such that the parallel ridges fit into the hollows of the pleats on one face of the particulate filter.
Claim 2
Dependent Claim
79 words
A sorbent filter structure comprising a pleated particulate filter element, having essentially parallel pleat axes, and a sorbent pad in the form of a flat base for sorbing undesirable gases, said pad having two major surfaces, the first being planar and the second having formed on it a plurality of spaced parallel ridges, said pad being further constructed and positioned such that the parallel ridges fit into the hollows of the pleats on one face of the particulate filter.
Claim 3
Dependent Claim
23 words
A sorbent filter structure according to claim 1 in which the pad is made from a sorbent form of carbon, silica, or alumina.
Claim 4
Dependent Claim
34 words
A sorbent filter structure according to claim 1 in which the pad of sorbent material is so constructed as to occupy at least 70 percent of the volume of the hollows in said pleats.
Claim 5
Dependent Claim
28 words
A sorbent filter structure according to claim 1 having upstream and downstream sides, in which the sorbent pad is located on the downstream side of the particulate filter.
Claim 6
Dependent Claim
31 words
A sorbent filter structure according to claim 1 in which the particulate filter element is first formed into micropleats and then into macropleats, the axes of all pleats being essentially parallel.
Claim 7
Dependent Claim
55 words
A sorbent filter structure according to claim 1 in which the upstream surface of the sorbent pad is provided with parallel ridges and the downstream surface is provided with an indicator means over at least a portion of said downstream surface, said indicator means being adapted to change color on contact with an undesirable gas.
Claim 8
Dependent Claim
28 words
A sorbent filter structure according to claim 1 in which the sorbent pad also contains a substance effective to chemically change an undesirable gas into an innocuous material.
Claim 9
Dependent Claim
78 words
A sorbent filter structure comprising a pleated particulate filter element having micropleats and macropleats, the axes of all pleats being essentially parallel, and a sorbent pad for sorbing undesirable gases, said pad having two major surfaces, the first being planar and the second having formed on it a plurality of parallel ridges, said pad being further constructed and positioned such that the parallel ridges fit into the hollows of the pleats on one face of the particulate filter.
Claim 10
Dependent Claim
78 words
A sorbent filter structure comprising a pleated particulate filter element having micropleats and macropleats, the axes of all pleats being essentially parallel, and a sorbent pad for sorbing undesirable gases, said pad having two major surfaces, the first being planar and the second having formed on it a plurality of parallel ridges, said pad being further constructed and positioned such that the parallel ridges fit into the hollows of the pleats on one face of the particulate filter.
Claim 11
Dependent Claim
55 words
A sorbent filter structure according to claim 8 in which the upstream surface of the sorbent pad is provided with parallel ridges and the downstream surface is provided with an indicator means over at least a portion of said downstream surface, said indicator means being adapted to change color on contact with an undesirable gas.
Claim 12
Dependent Claim
28 words
A sorbent filter structure according to claim 8 in which the sorbent pad also contains a substance effective to chemically change an undesirable gas into an innocuous material.
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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) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |