Patent US5478377A successfully refreshed from Google Patents.
US5478377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for a respiratory device
Assignee: United States Department of the Army
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Filing: 1994-07-22
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Granted: 1995-12-26
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Expires: 2014-07-22
Abstract
Abstract Disclosed is a filter for a reduced threat chemical/biological protective spiratory device which includes a housing having an air intake orifice and an air exit orifice and which encloses a filtering element which includes a plurality of bonded spherical carbon beads arranged in a open cell type matrix. The filtering element also includes an aerosol and particulate filtering element which is a plurality of electrostatically charged polypropylene fibers.
Inventors
- 👤 John A. Scavnicky
- 👤 Corey M. Grove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:34
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; B; B03; B03C; B03C3/00; B03C3/28; Y; Y10; Y10S; Y10S55/00; Y10S55/33; Y10S55/35
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
A lightweight filter for a protective respiratory device comprising: a substantially cylindrical housing having an air intake means and an air exit means at opposed ends thereof; filter means within said housing; said filter means including a pair of aerosol and particulate filtering means, each of said aerosol and particulate filtering means comprising a disc-shaped, electrostatically charged filtering element formed of polymeric fibers; a low resistance fiberglass screen interposed between one of said aerosol and particulate filtering means and said air intake means of said housing; another low resistance fiberglass screen interposed between the other of said aerosol and particulate filtering means and said air exit means of said housing; said filter means further including a disc-shaped filter element interposed between said pair of aerosol and particulate filtering means and including a plurality of carbon beads arranged in a matrix and attached to a reticulated foam member; and said pair of aerosol and particulate filtering means and said disc-shaped filter element are fixed to an interior wall of said housing by means of a sealant.
Claim 2
Dependent Claim
175 words
A lightweight filter for a protective respiratory device comprising: a substantially cylindrical housing having an air intake means and an air exit means at opposed ends thereof; filter means within said housing; said filter means including a pair of aerosol and particulate filtering means, each of said aerosol and particulate filtering means comprising a disc-shaped, electrostatically charged filtering element formed of polymeric fibers; a low resistance fiberglass screen interposed between one of said aerosol and particulate filtering means and said air intake means of said housing; another low resistance fiberglass screen interposed between the other of said aerosol and particulate filtering means and said air exit means of said housing; said filter means further including a disc-shaped filter element interposed between said pair of aerosol and particulate filtering means and including a plurality of carbon beads arranged in a matrix and attached to a reticulated foam member; and said pair of aerosol and particulate filtering means and said disc-shaped filter element are fixed to an interior wall of said housing by means of a sealant.
Claim 3
Dependent Claim
33 words
The filter of claim 1 wherein: the bonded carbon beads are substantially spherical in shape with diameters from about 0.2 millimeters to about 0.8 millimeters and are arranged in an open cell matrix.
Claim 4
Dependent Claim
45 words
The filter of claim 1 wherein: the polymeric fibers of said aerosol and particulate filtering means are polypropylene fibers which are from about 10 microns to about 40 microns in diameter and which are packed to a density of about 300 grams per square meter.
Claim 5
Dependent Claim
25 words
The filter of claim 1 wherein: the housing is formed of a glass filled nylon material; and said sealant is a room temperature vulcanized silicone.
Claim 6
Dependent Claim
51 words
The filter of claim 1 wherein: the housing has opposed first and second terminal ends with a tubular lateral wall interposed between said terminal ends; and each of the pair of the disc-shaped aerosol and particulate filtering means and the disc-shaped filter element abut the tubular lateral wall of the housing.
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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) | 1998-12-25 | 1999-06-26 | 1999-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-25 | 2003-06-26 | 2003-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-25 | 2007-06-26 | 2007-12-26 | $7700.00 | Window Closed / Lapsed |