US5033507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter cover assembly for a respirator
Assignee: MSA Safety Inc
•
Filing: 1990-06-19
•
Granted: 1991-07-23
•
Expires: 2010-06-19
Abstract
Abstract The present invention provides a filter cover assembly for use with the filter of a respirator. The semi-rigid filter cover assembly fits snugly over the face of the filter and, with the use of a one-way valve assembly mounted therein, allows the user to continue using the respirator while at the same time containing any contaminated particulate matter that may fall out of the filter. This permits the user to continue using the respirator while in a decontamination zone without danger of dispersing contaminated matter. It also permits easy handling and storage of the filter between uses without necessitating the cleaning of the filter.
Inventors
- 👤 Thomas D. Pouchot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:02
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; Y; Y10; Y10T; Y10T137/00; Y10T137/794; Y10T137/8122
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A removable filter cover assembly for use with a respirator including a filter having a construction lacing means for preventing matter dislodged from a filter inlet face of filter from passing to the external environment, the assembly comprising: a semi-rigid cover housing including a front face; an outer flange dimensioned for air-tight, friction-fit placement over a wall of the filter to form an air-tight seal therewith; means for connecting the front face and the outer flange and for spacing the front face from the filter inlet face; and a one-way valve assembly supported in the dover housing for permitting continued use of the respirator and for preventing any matter dislodged from the filter from passing to the external environment while the filter cover assembly is placed over the wall of the filter.
Claim 2
Dependent Claim
132 words
A removable filter cover assembly for use with a respirator including a filter having a construction lacing means for preventing matter dislodged from a filter inlet face of filter from passing to the external environment, the assembly comprising: a semi-rigid cover housing including a front face; an outer flange dimensioned for air-tight, friction-fit placement over a wall of the filter to form an air-tight seal therewith; means for connecting the front face and the outer flange and for spacing the front face from the filter inlet face; and a one-way valve assembly supported in the dover housing for permitting continued use of the respirator and for preventing any matter dislodged from the filter from passing to the external environment while the filter cover assembly is placed over the wall of the filter.
Claim 3
Dependent Claim
19 words
A filter cover assembly as described in claim 1 wherein the cover housing is made of a lightweight material.
Claim 4
Dependent Claim
19 words
A filter cover assembly as described in claim 1 wherein the cover housing is made of a non-brittle material.
Claim 5
Dependent Claim
19 words
A filter cover assembly as described in claim 1 wherein the cover housing is made of a non-corrosive material.
Claim 6
Dependent Claim
18 words
A filter cover assembly as described in claim 1 wherein the one-way valve assembly includes a valve cover.
Claim 7
Dependent Claim
24 words
A filter cover assembly as described in claim 5 wherein the one-way valve assembly is located in the front face of the cover housing.
Claim 8
Dependent Claim
94 words
A filter cover assembly as described in claim 1 wherein the means for connecting the front face and the outer flange and for spacing the front face from the filter inlet face comprise a side wall continuously joined to the front face and to a knuckle, the knuckle being continuously joined to the outer flange, wherein the side wall extends substantially parallel to but inwardly offset from the outer flange such that the knuckle is positionable adjacent the filter inlet face to establish a predetermined placement position of the cover housing on the filter.
Claim 9
Dependent Claim
18 words
A filter cover assembly as described in claim 7 wherein the one-way valve assembly includes a valve cover.
Claim 10
Dependent Claim
31 words
A filter cover assembly as described in claim 8 wherein the valve cover is in close proximity to the filter inlet face when the knuckle is adjacent the filter inlet face.
Claim 11
Dependent Claim
36 words
A filter cover assembly as described in claim 9 wherein the filter, the side wall, the front face and the valve assembly form a pocket which contains any particles which may be dislodged from the filter.
References Cited (Backward Citations)
US3059637A
Cited
US3990439A
Cited
US4543112A
Cited
US4548626A
Cited
US4686976A
Cited
US4818122A
Cited
US4850346A
Cited
US4793342A
Cited
US4838262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |