US3563236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Face pieces for protective masks
Assignee: Trelleborgs Gummifabriks AB
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Filing: 1968-11-20
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Granted: 1971-02-16
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Expires: 1988-11-20
Abstract
Abstract A face piece for a protective mask is made from a natural or synthetic rubber or a plastic material and has a solid sealing rib projecting from the inner side of the face piece to engage the wearer''s face. The width of the sealing rib in the plane of the face piece is larger than the projection of the rib from the inner side of the face piece, and the surface of the rib engaging the wearer''s face is profiled to approximately follow the shape of the skull by varying the thickness of the rib longitudinally and transversally thereof.
Inventors
- 👤 Otto Henry Hansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
254 words
A face mask made of a material from the group consisting of natural rubber, synthetic rubber and plastic materials, said face mask having an inlet for a clean inhaling gaseous medium, fastening means for inhaling and exhaling values and for mask fastening straps, at least one eye lens of clear material, a solid sealing rib on the inner side of the mask and projecting therefrom, said sealing rib having a larger width in the plane of the mask than the thickness of the projection of said rib from the inner side of the mask, a sealing surface on said sealing rib to engage the wearer''s face, said sealing rib extending in an upward arc from a point below the midpoint on each side of the mask and being located between the edge of the mask and said lens, a first bulge on said sealing rib at the edge thereof closest to said lens from a point just above the midpoint on each side of the mask, and a second bulge on said sealing rib at the edge thereof closest to said lens at the uppermost point of said sealing rib, said sealing surface being profiled, by varying the thickness of said rib, within the extent of said first and second bulges, to approximately follow the shape of the wearer''s skull, said first and second bulge being of sufficient rigidity so as To be capable of being pressed tightly against the skull to deform the skin and flesh therebetween and exploit them as sealing means.
Claim 2
Dependent Claim
254 words
A face mask made of a material from the group consisting of natural rubber, synthetic rubber and plastic materials, said face mask having an inlet for a clean inhaling gaseous medium, fastening means for inhaling and exhaling values and for mask fastening straps, at least one eye lens of clear material, a solid sealing rib on the inner side of the mask and projecting therefrom, said sealing rib having a larger width in the plane of the mask than the thickness of the projection of said rib from the inner side of the mask, a sealing surface on said sealing rib to engage the wearer''s face, said sealing rib extending in an upward arc from a point below the midpoint on each side of the mask and being located between the edge of the mask and said lens, a first bulge on said sealing rib at the edge thereof closest to said lens from a point just above the midpoint on each side of the mask, and a second bulge on said sealing rib at the edge thereof closest to said lens at the uppermost point of said sealing rib, said sealing surface being profiled, by varying the thickness of said rib, within the extent of said first and second bulges, to approximately follow the shape of the wearer''s skull, said first and second bulge being of sufficient rigidity so as To be capable of being pressed tightly against the skull to deform the skin and flesh therebetween and exploit them as sealing means.
Claim 3
Dependent Claim
39 words
The mask of claim 1 further having two outward bulges on said sealing rib at the edge thereof remote from said lens, said outward bulges approximately conforming to the arch of the broad curved portion of the frontal bone.
Claim 4
Dependent Claim
42 words
The mask of claim 1 further having an outward bulge on said sealing rib at the edge thereof closest to the lens on a level with each of the articular processes of the lower jaw beneath the zygomatic process of the skull.
Claim 5
Dependent Claim
69 words
The mask as defined in claim 1 wherein said mask includes means disposed below said eye lens for attaching said mask to a protective filter and permitting filtered air to enter said mask and at least one inlet passage connected to said means and extending therefrom toward said eye lens to enable all inhaled filtered air entering said mask to pass over the inner surface of said eye lens.
Claim 6
Dependent Claim
46 words
The mask as defined in claim 4 further having an inner mask integral with the mask and defined by a baffle extending from the inner side of the mask below said eye lens to engage the wearer''s face from the jaw-joints to and over the nose.
Claim 7
Dependent Claim
72 words
The mask as defined in claim 5 wherein said baffle is provided with at least one inhaling valve disposed therein, at least one inhaling passage communicating between said inhaling valve and the interior of the mask to permit filtered air which has passed over said eye lens to be inhaled by the wearer of the mask, and an outlet means in said mask for permitting passage of exhaled air to the atmosphere.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |