US4136688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective devices
Assignee: RACAL ACOUSTIC SERVICES Ltd
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Filing: 1977-03-08
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Granted: 1979-01-30
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Expires: 1997-03-08
Abstract
Abstract A respirator is sealed at its sides to the face of a wearer by seals or air flow restricting members comprising a multiplicity of bristles. The length of the bristles is chosen so that they are deflected to lie at their free ends against the wearer's face. The length resilience and packing density of the bristles is selected to provide a required resistance to air flow. The bristles are of horse hair, camel hair, nylon, polypropylene or other noninjurious material. Preferred bristle diameters are 0.03 to 0.25 mm and lengths 10 to 30 mm.
Inventors
- 👤 Anthony G. Gorman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:52
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/04; A62B18/045; A42; A42B; A42B3/00; A42B3/04; A42B3/28; A42B3/286; Y; Y10; Y10S; Y10S55/00; Y10S55/35
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A respiratory helmet comprising means providing filtered air, visor means guiding air in front of the wearer's face, and air flow restricting means restricting the egress of air between said visor means and the sides of the wearer's face said air flow restricting means comprising a supporting member sealed to the lateral edge of the visor means and a multiplicity of bristles extending from said supporting member inwardly of the visor to engage the wearer's face.
Claim 2
Dependent Claim
76 words
A respiratory helmet comprising means providing filtered air, visor means guiding air in front of the wearer's face, and air flow restricting means restricting the egress of air between said visor means and the sides of the wearer's face said air flow restricting means comprising a supporting member sealed to the lateral edge of the visor means and a multiplicity of bristles extending from said supporting member inwardly of the visor to engage the wearer's face.
Claim 3
Dependent Claim
102 words
A respiratory helmet, comprising (a) means for providing filtered air to the interior of said helmet; (b) visor means for directing said filtered air to the front of a wearer's face; (c) air flow restricting means arranged in contiguous relation between the lateral edges of said visor means and the sides of the wearer's face; and (d) channel shaped means for removably connecting said air flow restricting means in sealing relationship with the lateral edges of said visor means, whereby said air flow restricting means restrict the egress of filtered air between said visor means and the sides of the wearer's face.
Claim 4
Dependent Claim
102 words
A respiratory helmet, comprising (a) means for providing filtered air to the interior of said helmet; (b) visor means for directing said filtered air to the front of a wearer's face; (c) air flow restricting means arranged in contiguous relation between the lateral edges of said visor means and the sides of the wearer's face; and (d) channel shaped means for removably connecting said air flow restricting means in sealing relationship with the lateral edges of said visor means, whereby said air flow restricting means restrict the egress of filtered air between said visor means and the sides of the wearer's face.
Claim 5
Dependent Claim
42 words
A respiratory helmet as defined in claim 2, wherein said air flow restricting means comprises a supporting member connected with said connector means and a multiplicity of bristles extending from said supporting member inwardly of the visor to engage the wearer's face.
Claim 6
Dependent Claim
22 words
A respiratory helmet as defined in claim 3, wherein said bristles have a diameter within the range of 0.003 to 0.25 mm.
Claim 7
Dependent Claim
19 words
A respiratory helmet as defined in claim 3, wherein said bristles have lengths in the range of 10-30 mm.
Claim 8
Dependent Claim
28 words
A respiratory helmet as defined in claim 3, wherein said bristles are formed from a material selected from the group comprising horse hair, camel hair, nylon and polypropylene.
Claim 9
Dependent Claim
19 words
A respiratory helmet as defined in claim 3, wherein said bristles extend in inclined relation from said supporting member.
Claim 10
Dependent Claim
18 words
A respiratory helmet as defined in claim 3, wherein said bristles are arranged in a plurality of rows.
Claim 11
Dependent Claim
30 words
A respiratory helmet as defined in claim 3, and further comprising an adaptor member for connecting said air flow restricting supporting member in sealed spaced relation with said connector means.
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) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |