Patent US4520509A successfully refreshed from Google Patents.
US4520509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mask with removable countercurrent exchange module
Assignee: Individual
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Filing: 1983-02-18
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Granted: 1985-06-04
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Expires: 2003-02-18
Abstract
Abstract A face mask for use in hazardous environments and comprising an elastic sheet for securement about the lower face and head. The sheet is partially folded to define an open area located forwardly of the wearer's nose and mouth and within which area is removably attached a filter body which may also constitute a countercurrent exchange medium. Fabric closure material on the elastic sheet and filter body serves to removably attach the filter body in place. Additional fabric closure strips of the hook and loop type, when mated to one another, hold the elastic sheet in a partially folded shape to define the aforementioned open area. The filter body may be of a fibrous nature or a molded nose cup shape.
Inventors
- 👤 Russell G. Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:41
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1161; A41D13/1107; A41D13/1138; A41D13/1146; A41D2300/00; A41D2300/30; A41D2300/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
A face mask for protecting the wearer from hazardous environmental conditions such as cold temperatures or airborne particles, said mask comprising, a filter body of three dimensional shape, a fabric sheet which may be configured to define an open area within which said filter body is at least partially inset, means on said sheet for securing same to a wearer's face, closure strips on said fabric sheet to retain same in a desired configuration to define said open area, and attachment means in place on said sheet and about the perimeter of said filter body whereby the filter body may be retained in place within said open area in a removable manner.
Claim 2
Dependent Claim
112 words
A face mask for protecting the wearer from hazardous environmental conditions such as cold temperatures or airborne particles, said mask comprising, a filter body of three dimensional shape, a fabric sheet which may be configured to define an open area within which said filter body is at least partially inset, means on said sheet for securing same to a wearer's face, closure strips on said fabric sheet to retain same in a desired configuration to define said open area, and attachment means in place on said sheet and about the perimeter of said filter body whereby the filter body may be retained in place within said open area in a removable manner.
Claim 3
Dependent Claim
22 words
The face mask claimed in claim 1 wherein that portion of said fabric sheet defining said open area is of folded configuration.
Claim 4
Dependent Claim
26 words
The face mask claimed in claim 2 wherein said closure strips when mated with one another form and retain the sheet in a partially folded configuration.
Claim 5
Dependent Claim
31 words
The face mask claimed in claim 3 wherein said fabric sheet includes a liner portion located inwardly of the filter body to partially cover the face when the mask is worn.
Claim 6
Dependent Claim
15 words
The face mask claimed in claim 1 wherein said attachment means are fabric closure strips.
Claim 7
Dependent Claim
26 words
The face mask claimed in claim 1 wherein said closure strips when mated with one another form and retain the sheet in a partially folded configuration.
Claim 8
Dependent Claim
16 words
The face mask claimed in claim 1 wherein said fabric sheet is of an elastic nature.
References Cited (Backward Citations)
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Cited
US2556589A
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US2751904A
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US2818857A
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |