Patent US3716053A successfully refreshed from Google Patents.
US3716053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breathing apparatus
Assignee: Spirotech Inc
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Filing: 1971-03-12
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Granted: 1973-02-13
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Expires: 1991-03-12
Abstract
Abstract A breathing apparatus having a breathing mask which consists of an outer mask provided with eye pieces and an inner mask enclosing the mouth and the nose. A gas chamber is connected with the mask and is divided into two rooms. A first room comprises an inlet valve and is in direct gas fluid communication with the space between the outer and the inner mask, and a second room comprises an outlet valve and a membrance for controlling the inlet valve and is in direct gas fluid communication with the space inside the inner mask.
Inventors
- 👤 H Almovist
- 👤 S Backlund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:53
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/02; B63C11/18; B63C11/22; B63C11/2227; A; A62; A62B; A62B9/00; A62B9/02; A62B9/022; Y; Y10; Y10S; Y10S137/00; Y10S137/908
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
182 words
Breathing apparatus with a breathing mask comprising an outer mask and an inner mask, the outer mask being provided with eye pieces and the inner mask for enclosing the mouth and nose of the user of the apparatus, and further comprising a gas chamber connected with the breathing mask, a wall dividing the gas chamber into a first and second room, the first room comprising an inlet valve and being in direct gas fluid connection with the space between the outer mask and the inner mask, the second room being in direct gas fluid connection with the space inside the inner mask, air inlet means opening into said first room and outlet means opening into from said second room, a control member disposed in said second room between said inlet means and outlet means, an outlet valve disposed between said control member and said outlet means, a lever connecting the member and the inlet valve for controlling the inlet valve, said lever being hinged in said wall and having one part in said first room and another part in said second room.
Claim 2
Dependent Claim
182 words
Breathing apparatus with a breathing mask comprising an outer mask and an inner mask, the outer mask being provided with eye pieces and the inner mask for enclosing the mouth and nose of the user of the apparatus, and further comprising a gas chamber connected with the breathing mask, a wall dividing the gas chamber into a first and second room, the first room comprising an inlet valve and being in direct gas fluid connection with the space between the outer mask and the inner mask, the second room being in direct gas fluid connection with the space inside the inner mask, air inlet means opening into said first room and outlet means opening into from said second room, a control member disposed in said second room between said inlet means and outlet means, an outlet valve disposed between said control member and said outlet means, a lever connecting the member and the inlet valve for controlling the inlet valve, said lever being hinged in said wall and having one part in said first room and another part in said second room.
Claim 3
Dependent Claim
182 words
Breathing apparatus with a breathing mask comprising an outer mask and an inner mask, the outer mask being provided with eye pieces and the inner mask for enclosing the mouth and nose of the user of the apparatus, and further comprising a gas chamber connected with the breathing mask, a wall dividing the gas chamber into a first and second room, the first room comprising an inlet valve and being in direct gas fluid connection with the space between the outer mask and the inner mask, the second room being in direct gas fluid connection with the space inside the inner mask, air inlet means opening into said first room and outlet means opening into from said second room, a control member disposed in said second room between said inlet means and outlet means, an outlet valve disposed between said control member and said outlet means, a lever connecting the member and the inlet valve for controlling the inlet valve, said lever being hinged in said wall and having one part in said first room and another part in said second room.
Claim 4
Dependent Claim
182 words
Breathing apparatus with a breathing mask comprising an outer mask and an inner mask, the outer mask being provided with eye pieces and the inner mask for enclosing the mouth and nose of the user of the apparatus, and further comprising a gas chamber connected with the breathing mask, a wall dividing the gas chamber into a first and second room, the first room comprising an inlet valve and being in direct gas fluid connection with the space between the outer mask and the inner mask, the second room being in direct gas fluid connection with the space inside the inner mask, air inlet means opening into said first room and outlet means opening into from said second room, a control member disposed in said second room between said inlet means and outlet means, an outlet valve disposed between said control member and said outlet means, a lever connecting the member and the inlet valve for controlling the inlet valve, said lever being hinged in said wall and having one part in said first room and another part in said second room.
References Cited (Backward Citations)
US2684066A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |