Patent US4999034A successfully refreshed from Google Patents.
US4999034A
Expired / Lapsed
US
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Desiccant cartridge
Assignee: Sued Chemie AG
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Filing: 1990-01-31
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Granted: 1991-03-12
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Expires: 2010-01-31
Abstract
Abstract A desiccant cartridge for a container, which contains moisture-sensitive product, wherein said desiccant cartridge contains at least one outside-connection opening via which the desiccant cartridge is joined to the surrounding air, a desiccant being contained in a cartridge casing. A surrounding-air duct extends between the outside-connection opening and the desiccant. This surrounding-air duct forms a long diffusion path in relation to the breathing cross-sectional area of the desiccant cartridge.
Inventors
- 👤 Peter Mager
- 👤 Willi Schenkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:13
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/26; B01D53/261
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
111 words
A desiccant cartridge for connection to a container which contains moisture-sensitive products wherein said desiccant cartridge is comprised of a cartridge casing having a dessicant, means for retaining the desiccant and having at least two openings for the passage of air, one opening (a) being connected to the container, the other opening (b) being connected to the cartridge casing and communicating with the outside air by means of an outer casing which forms an air duct which completely surrounds the cartridge casing wherein said air-duct forms a diffusion path the length of which is at least eight-times greater than the square root of the breathing cross-sectional area of the desiccant cartridge.
Claim 2
Dependent Claim
111 words
A desiccant cartridge for connection to a container which contains moisture-sensitive products wherein said desiccant cartridge is comprised of a cartridge casing having a dessicant, means for retaining the desiccant and having at least two openings for the passage of air, one opening (a) being connected to the container, the other opening (b) being connected to the cartridge casing and communicating with the outside air by means of an outer casing which forms an air duct which completely surrounds the cartridge casing wherein said air-duct forms a diffusion path the length of which is at least eight-times greater than the square root of the breathing cross-sectional area of the desiccant cartridge.
Claim 3
Dependent Claim
32 words
The desiccant cartridge of claim 1 wherein the length of the diffusion path is at least 10 times greater than the square root of the breathing cross-sectional area of the desiccant cartridge.
Claim 4
Dependent Claim
22 words
The desiccant cartridge of claim 1 wherein the surrounding-air duct has at least one deflection up to 180° in the opposite direction.
Claim 5
Dependent Claim
62 words
The desiccant cartridge of claim 1 wherein the effective cross-section of the outside-connection openings is designed to correspond to the maximum flow rate which occurs during the filling or emptying of the container or, when the container is not being filled, is designed to correspond to the flow rate caused by heating up or cooling down the gas situated in the container.
Claim 6
Dependent Claim
42 words
The desiccant cartridge of claim 1 wherein the cartridge casing, along with the desiccant situated therein, is formed as a conventional cartridge with a cylindrical basic form, either as a refillable cartridge or as a disposable cartridge with a sealed cartridge casing.
Claim 7
Dependent Claim
21 words
The desiccant cartridge of claim 1 wherein the cartridge casing has a diameter which is great in relation to its length.
Claim 8
Dependent Claim
35 words
The desiccant cartridge of claim 1 wherein the surrounding-air duct has a ventilation tube which extends above the desiccant and whose diameter is at least eight times less than the length of the diffusion path.
Claim 9
Dependent Claim
22 words
The desiccant cartridge of claim 7 wherein the diameter is eight to eleven times less than the length of the diffusion path.
Claim 10
Dependent Claim
22 words
The desiccant cartridge of claim 1 wherein the surrounding-air duct has a cross-section which increase from the outside-connection opening towards the desiccant.
Claim 11
Dependent Claim
14 words
The desiccant cartridge of claim 9 wherein the increase is in a stepwise manner.
Claim 12
Dependent Claim
30 words
The desiccant cartridge of claim 1, wherein the cartridge opening is surrounded by the outer casing and the surrounding-air duct extends partially between the outer casing and the cartridge casing.
Claim 13
Dependent Claim
21 words
The desiccant cartridge of claim 11 wherein the outer casing and the cartridge casing are arranged essentially coaxially and extend vertically.
Claim 14
Dependent Claim
33 words
The desiccant cartridge of claim 11 wherein several outside-connection openings are provided whose total cross-sectional area corresponds to or is less than the area of the ventilation tube or the breathing cross-sectional area.
Claim 15
Dependent Claim
45 words
The desiccant cartridge of claim 13 wherein the outside-connection openings are annular in shape and distributed about the outer casing, are arranged adjacent to the container-side end of the desiccant cartridge and extend either radially or axially, in each case relative to the cartridge casing.
Claim 16
Dependent Claim
20 words
The desiccant cartridge as claimed in claim 11 wherein the outer casing has a protective tube sealed with a cover.
Claim 17
Dependent Claim
50 words
The desiccant cartridge as claimed in claim 15 wherein the protective tube is produced from transparent material or has a viewing window for checking the loading or saturation of the desiccant by the coloration of the impregnated fields of a moisture indicator card or of a desiccant with an indicator.
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) | 1994-03-11 | 1994-09-10 | 1995-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-11 | 1998-09-10 | 1999-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-11 | 2002-09-10 | 2003-03-12 | $7700.00 | Window Closed / Lapsed |