US4981501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adsorption filter with high air permeability
Assignee: Mbh Filtration & Co KG GmbH
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Filing: 1990-05-16
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Granted: 1991-01-01
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Expires: 2010-05-16
Abstract
Abstract The adsorption filter has a highly air-permeable, three-dimensional carrier framework essentially stable in shape, to which a layer of granular adsorber particles with a diameter of 0.1 to 1 mm is affixed. The carrier framework can be composed of wires, monofilaments or stays, the distance between them being at least twice as great as the diameter of the adsorber particles. The carrier framework can also be a large-pore reticulated polyurethane foam which has a weight of 20 to 60 g/l and pores with a diameter of 1.5 to 3 mm. In spite of a very slight pressure drop, the filter performance is excellent.
Inventors
- 👤 Hasso von Blucher
- 👤 Ernest de Ruiter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/28016; B01J20/28019; B01D; B01D39/00; B01J20/28002; B01J20/28004; B01J20/28011; B01J20/28023; B01J20/28042; B01J20/28045; B01J20/28054; B01J20/28057; B01J20/28078; B01J20/30; B01J20/32; B01J20/3214; B01J20/3223; Y; Y10; Y10S; Y10S55/00; Y10S55/13; Y10S55/15
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
126 words
An adsorption filter with high air permeability, comprising a highly air-permeable, three-dimensional carrier framework essentially stable in shape, formed of wires, monofilaments or stays, to which there is affixed a principal filtration stage and a preliminary filtration stage, the principal stage comprising a layer of granular, moisture insensitive adsorber particles with a diameter of about 0.1 to 1 mm, the preliminary filtration stage comprising a large pored adsorbent upstream of the granular adsorber particles, the gases to be filtered first encountering the large pored adsorbent to remove the large molecules of the material to be filtered and then encountering the downstream smaller pored adsorber particles, the distance between the wires, monofilaments or stays being at least twice as great as the diameter of the adsorber particles.
Claim 2
Dependent Claim
126 words
An adsorption filter with high air permeability, comprising a highly air-permeable, three-dimensional carrier framework essentially stable in shape, formed of wires, monofilaments or stays, to which there is affixed a principal filtration stage and a preliminary filtration stage, the principal stage comprising a layer of granular, moisture insensitive adsorber particles with a diameter of about 0.1 to 1 mm, the preliminary filtration stage comprising a large pored adsorbent upstream of the granular adsorber particles, the gases to be filtered first encountering the large pored adsorbent to remove the large molecules of the material to be filtered and then encountering the downstream smaller pored adsorber particles, the distance between the wires, monofilaments or stays being at least twice as great as the diameter of the adsorber particles.
Claim 3
Dependent Claim
37 words
An adsorption filter according to claim 1, wherein the adsorber particles of the principal stage are selected from the group consisting of activated carbon, synthetic organic adsorbers, carbonized and activated organic adsorbers, inorganic adsorbers and molecular sieves.
Claim 4
Dependent Claim
15 words
An adsorption filter according to claim 1, wherein the adsorber particles comprise a styrene-divinylbenzene copolymer.
Claim 5
Dependent Claim
13 words
An adsorption filter according to claim 1, wherein the adsorber particles are ball-shaped.
Claim 6
Dependent Claim
25 words
An adsorption filter according to claim 1, wherein the openings or pores of the carrier framework have a diameter of about 2 to 4 mm.
Claim 7
Dependent Claim
38 words
An adsorption filter according to claim 1, wherein the diameter of the wires, monofilaments or stays of the carrier framework is such that there is complete coverage of the carrier framework with the adsorber particles affixed to it.
Claim 8
Dependent Claim
18 words
An adsorption filter according to claim 1, wherein the carrier framework is completely covered with the adsorber particles.
Claim 9
Dependent Claim
21 words
An adsorption filter according to claim 1, wherein the adsorber particles are affixed to the carrier framework with an adhesive mass.
Claim 10
Dependent Claim
30 words
An adsorption filter according to claim 8, wherein the adhesive mass is a polymer, of an acrylic acid derivative, a polyurethane, a polystyrene, a polyvinyl acetate or a hot-melt glue.
Claim 11
Dependent Claim
28 words
An adsorption filter according to claim 8, wherein the adhesive mass comprises a polymer which can be cross-linked and which passes through a viscosity minimum before being cross-linked.
Claim 12
Dependent Claim
19 words
An adsorption filter according to claim 8, wherein the adhesive mass comprises an inorganic mixture which can be melted.
Claim 13
Dependent Claim
20 words
An adsorption filter according to claim 1, wherein the adsorber particles have a size of about 0.1 to 0.2 mm.
Claim 14
Dependent Claim
26 words
An adsorption filter according to claim 1, wherein the adsorber particles are present in an amount of about 50 to 300 g/l of the filter material.
Claim 15
Dependent Claim
14 words
An adsorption filter according to claim 1, wherein the adsorber particles comprise activated charcoal.
Claim 16
Dependent Claim
24 words
An adsorption filter according to claim 14, wherein the activated charcoal particles have an internal surface of about 600 to 2000 m 2 /g.
Claim 17
Dependent Claim
13 words
An adsorption filter according to claim 1, wherein the adsorber particles are pressure-resistant.
Claim 18
Dependent Claim
16 words
An adsorption filter according to claim 1, wherein the adsorber particles are impregnated with metal compounds.
Claim 19
Dependent Claim
14 words
An adsorption filter according to claim 1, wherein the adsorber particles contain encapsulated enzymes.
Claim 20
Dependent Claim
13 words
An adsorption filter according to claim 1, wherein the carrier framework is plastic.
Claim 21
Dependent Claim
17 words
An adsorption filter according to claim 19, wherein the carrier framework is a large-pore reticulated polyurethane foam.
Claim 22
Dependent Claim
31 words
An adsorption filter according to claim 20, wherein the large-pore reticulated polyurethane foam weighs about 20 to 60 g/l and has pores with a diameter of about 1.5 to 3 mm.
Claim 23
Dependent Claim
22 words
An adsorption filter according to claim 1, wherein the carrier framework is formed of wire netting or wire mesh superimposed in layers.
Claim 24
Dependent Claim
29 words
An adsorption filter according to claim 1, wherein the carrier framework is composed of plastic or wire spirals with a length from about 1 to 10 times their diameter.
Claim 25
Dependent Claim
48 words
An adsorption filter according to claim 1, wherein the carrier structure is formed of wires or monofilaments with a length of about 2 to 10 mm, which are held by twisted metal or plastic wires and project perpendicular from this axis in the shape of a spiral staircase.
Claim 26
Dependent Claim
32 words
An adsorption filter according to claim 1, wherein the carrier structure is formed of fiber brushes which radiate out from a center point, with a length of about 2 to 10 mm.
Claim 27
Dependent Claim
24 words
An adsorption filter according to claim 1, wherein the carrier structures are connected with one another by heterophilic fibers or threads of hot-melt glue.
Claim 28
Dependent Claim
43 words
An adsorption filter according to claim 1, exhibiting a pressure drop of less than 10 mm water column at an air flow of one liter per second for a filter layer of 4 cm and a circular cross-section of 100 cm 2 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |