US3779244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable face respirator
Assignee: Johns Manville Corp
•
Filing: 1971-02-03
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Granted: 1973-12-18
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Expires: 1991-02-03
Abstract
Abstract A respirator mask is formed by a filter medium that comprises a majority of the face portion of the mask and edge sealing means. The filter medium includes at least two layers of interfelted fibers: (a) a backing layer of fibers, and a binder, and (b) a filter layer including fibers having a fine diameter. The filter medium is formed by sequentially depositing solids on a foraminous mold having the desired shape of the interior of the mask, from separate aqueous slurries. A pressure differential is applied across the foraminous mold to cause the fluid portion of each slurry to pass through the mold and to deposit solids on the mold.
Inventors
- 👤 T Weeks
- 👤 G Reimschussel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:26
CPC Classifications
A; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A41D13/1107; A41D13/1138; A41D13/1146; Y; Y10; Y10S; Y10S55/00; Y10S55/35
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
20 words
The respirator mask of claim 1 wherein said edge seal means are deformable to the contours of the wearer''s face.
Claim 2
Dependent Claim
35 words
The respirator mask of claim 2 in which said backing layer includes from about 20 to about 60 percent by weight of a synthetic organic resin binder uniformly distributed on the surface of the fibers.
Claim 3
Dependent Claim
26 words
The respirator mask of claim 2 in which said fine diameter fibers are glass fibers having average diameters in the range of 1.6 to 2.6 microns.
Claim 4
Dependent Claim
15 words
The respirator mask of claim 2 in which said filter medium includes irregular surface corrugations.
Claim 5
Dependent Claim
35 words
The respirator mask of claim 2 in which said filter medium includes a second backing layer comprising bonded, interfelted resilient fibers, said filter layer being positioned between said backing layer and said second backing layer.
Claim 6
Dependent Claim
19 words
The respirator mask of claim 2 in which said filter medium includes an exhalation valve in said filter medium.
Claim 7
Dependent Claim
35 words
The respirator mask of claim 2 in which said edge seal means is aDhered to the peripheral portion of said filter medium and comprises a grooved elastomeric band having a ductile wire located centrally therein.
Claim 8
Dependent Claim
29 words
The respirator mask of claim 2 in which said edge seal means has an upper edge portion which is centrally recessed to receive the bridge of the wearer''s nose.
Claim 9
Dependent Claim
20 words
The respirator mask of claim 1 wherein said fine diameter fibers have a diameter of up to about 2.6 microns.
Claim 10
Dependent Claim
20 words
The respirator mask of claim 1 wherein said fine diameter fibers have a diameter of up to about 1.6 microns.
Claim 11
Dependent Claim
24 words
The respirator mask of claim 1 in which said filter layer includes from about 4 to about 20 percent of said fine diameter fibers.
Claim 12
Dependent Claim
27 words
The respirator mask of claim 1 wherein said resilient fibers of said filter layer are non-skrinkable or low-skrinkable at a temperature adequate to cure the filter medium.
Claim 13
Dependent Claim
37 words
The respirator mask of claim 1 wherein said resilient fibers of said filter layer and said resilient fibers of said backing layer have a length in the range of from about 1/8 inch to about 3/4 inch.
References Cited (Backward Citations)
US2922418A
Cited
US3042035A
Cited
GB892262A
Cited
US3220409A
Cited
US3249108A
Cited
US3333585A
Cited
US3620214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |