US3750665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible respirator with inflatable frame
Assignee: Individual
•
Filing: 1971-06-21
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Granted: 1973-08-07
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Expires: 1991-06-21
Abstract
Abstract A respirator, i.e. a face mask provided with a filter for respiratory use, comprising a substantially ring-shaped inflatable frame consisting of tubular foil material supporting a flexible wall having a perforated central portion to which the filter is attached. The central portion of the wall is stretched in a substantially planar state by the inflated frame and the filter is designed as a flexible disc-shaped pad covering the perforated portion of the wall.
Inventors
- 👤 F Stranicky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:55
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; A41; A41D; A41D13/00; A41D13/05; A41D13/11; A62B23/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A respirator adapted for inhalation of air from the environment outside of the respirator through a filter therein, said respirator comprising an air-filled inflatable generally ring-shaped tubular fraMe made of flexible material, a wall supported by said frame and consisting of a foil made of flexible material having a perforated central portion, said wall being stretched by said frame in a substantially planar state at a distance from the face of a wearer of the respirator, a flexible filter pad, means for positioning the filter pad in side by side adjacent relation to the perforated portion of said wall, and means for removably securing said respirator on the face of the wearer thereof.
Claim 2
Dependent Claim
113 words
A respirator adapted for inhalation of air from the environment outside of the respirator through a filter therein, said respirator comprising an air-filled inflatable generally ring-shaped tubular fraMe made of flexible material, a wall supported by said frame and consisting of a foil made of flexible material having a perforated central portion, said wall being stretched by said frame in a substantially planar state at a distance from the face of a wearer of the respirator, a flexible filter pad, means for positioning the filter pad in side by side adjacent relation to the perforated portion of said wall, and means for removably securing said respirator on the face of the wearer thereof.
Claim 3
Dependent Claim
55 words
A respirator as claimed in claim 1, wherein said wall includes an integral edge portion of generally semicircular cross-section turned towards the face of the wearer of the respirator and extending around the periphery of said wall, said tubular frame being fitted in said edge portion and secured to said wall by said edge portion.
Claim 4
Dependent Claim
23 words
A respirator as claimed in claim 2, wherein said generally ring-shaped frame comprises a hose having two closed ends positioned adjacent each other.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |