US3611801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respiration monitor
Assignee: National Aeronautics and Space Administration
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Filing: 1968-10-28
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Granted: 1971-10-12
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Expires: 1988-10-28
Abstract
Abstract A RESPIRATION MONITOR WHICH MAY BE INSERTED DIRECTLY INTO A HIGH-PRESSURE OXYGEN LINE IS PROVIDED BY A CAPPED TUBE ADAPTED TO BE CONNECTED TO A SOURCE OF OXYGEN UNDER PRESSURE. A HOLE ON THE SIDE OF THE TUBE ALLOWS OXYGEN TO ESCAPE INTO A SEALED CHAMBER HAVING AN OUTLET PORT ADAPTED TO BE CONNECTED TO A FACE MASK THROUGH A REGULATOR. A MICROPHONE PLACED OPPOSITE THE HOLE DETECTS TURBULENCE CREATED BY OXYGEN TURNING 90* TO ESCAPE. A SIGNAL FROM THE MICROPHONE IS CONDITIONED TO DERIVE DESIRED INFORMATION, SUCH AS RESPIRATION RATE AND TOTAL BREATHS.
Inventors
- 👤 Robert J Fagot
- 👤 Robert T Mcdonald
- 👤 James A Roman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:45
CPC Classifications
A; A61; A61B; A61B7/00; A61B7/003; A61B5/00; A61B5/08; A61B5/0816; G; G01; G01F; G01F1/00; G01F1/72
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |