Patent US5158077A successfully refreshed from Google Patents.
US5158077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter container for an absorption filter and a particle filter, for direct or indirect connnection to a protective mask
Assignee: Sundstroem Safety AB
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Filing: 1991-07-15
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Granted: 1992-10-27
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Expires: 2011-07-15
Abstract
Abstract A filter container for direct or indirect connection to a protective mask comprises a cup-shaped casing having a bottom wall with an inhalation air intake formed therein, a cover closing the casing and having a top wall with an inhalation air outtake formed therein, a particle filter disposed within a bottom portion of the casing and secured around its circumference to an inner sidewall of the casing, and an absorption filter mounted between the particle filter and the cover within an upper portion of the casing. The bottom wall of the casing has a plurality of inwardly projecting, circumferentially spaced, radially directed stiffening ribs formed thereon, and the stiffening ribs have inwardly facing longitudinal edges lying substantially in a single plane. The particle filter has upper and lower folds, and engages at lower folds thereof the inwardly facing longitudinal edges of the stiffening ribs and engages at upper folds thereof a member supporting a bottom of the absorption filter.
Inventors
- 👤 Per O. Sundstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:06
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; Y; Y10; Y10S; Y10S55/00; Y10S55/35
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 words
A filter container for direct or indirect connection to a protective mask, comprising a cup-shaped casing having a bottom wall with an inhalation air intake formed therein, a cover closing said casing and having a top wall with an inhalation air outtake formed therein, a particle filter disposed within a bottom portion of said casing and secured around its circumference to an inner sidewall of said casing, and an absorption filter mounted between said particle filter and said cover within an upper portion of said casing, said bottom wall having a plurality of inwardly projecting, circumferentially spaced, radially directed stiffening ribs formed thereon, said stiffening ribs having inwardly facing longitudinal edges lying substantially in a single plane, and wherein said particle filter has upper and lower folds and said particle filter engages at lower folds thereof the inwardly facing longitudinal edges of said stiffening ribs and engages at upper folds thereof a member supporting a bottom of said absorption filter.
Claim 2
Dependent Claim
160 words
A filter container for direct or indirect connection to a protective mask, comprising a cup-shaped casing having a bottom wall with an inhalation air intake formed therein, a cover closing said casing and having a top wall with an inhalation air outtake formed therein, a particle filter disposed within a bottom portion of said casing and secured around its circumference to an inner sidewall of said casing, and an absorption filter mounted between said particle filter and said cover within an upper portion of said casing, said bottom wall having a plurality of inwardly projecting, circumferentially spaced, radially directed stiffening ribs formed thereon, said stiffening ribs having inwardly facing longitudinal edges lying substantially in a single plane, and wherein said particle filter has upper and lower folds and said particle filter engages at lower folds thereof the inwardly facing longitudinal edges of said stiffening ribs and engages at upper folds thereof a member supporting a bottom of said absorption filter.
Claim 3
Dependent Claim
24 words
A filter container according to claim 1, wherein said particle filter is adhesively sealed around its circumference to said inner sidewall of said casing.
Claim 4
Dependent Claim
54 words
A filter container according to claim 2, wherein the upper portion of said casing has a circumferential shoulder on which said absorption filter is mounted and said lower portion of said casing has a circumferential recess adjacent to said circumferential shoulder and to which an upper circumferential edge of said particle filter is glued.
Claim 5
Dependent Claim
27 words
A filter container according to claim 3, wherein said member supporting said bottom of said absorption filter is urged firmly against said shoulder by said absorption filter.
Claim 6
Dependent Claim
18 words
A filter container according to claim 1, wherein said bottom wall bulges outwardly toward said inhalation air intake.
Claim 7
Dependent Claim
40 words
A filter container according to claim 1, wherein said bottom portion of said casing has a cylindrical sidewall and said upper portion of said casing has a cylindrical sidewall of slightly greater diameter than said sidewall of said bottom portion.
Claim 8
Dependent Claim
31 words
A filter container according to claim 1, wherein said cover is bonded to said casing and said inhalation air outtake has a threaded tubular extension for connection to the protective mask.
Claim 9
Dependent Claim
19 words
A filter container according to claim 1, wherein said ribs are arranged alternately in longer and shorter radial lengths.
Claim 10
Dependent Claim
25 words
A filter container according to claim 8, wherein said ribs have respective radial outer ends substantially uniformly distant from an axis of the filter container.
References Cited (Backward Citations)
SU164205A1
Cited
GB396323A
Cited
FR845722A
Cited
US2825424A
Cited
US3118445A
Cited
FR1464075A
Cited
GB1247524A
Cited
FR2121282A5
Cited
DE2217761A1
Cited
US4543112A
Cited
US4548626A
Cited
DE3515642A1
Cited
US4714486A
Cited
US5052385A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |