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US3631438A
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Apnoea alarms
Assignee: NAT RES DEV
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Filing: 1969-09-30
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Granted: 1971-12-28
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Expires: 1989-09-30
Abstract
Abstract An apnoea alarm comprises a compartmented air mattress the individual compartments of which are connected to a common chamber containing a anemometer. The anemometer is connected to an electronic circuit which gives an alarm after a preset time if there is no airflow over the katherometer due to movement of the mattress caused by a breathing baby lying on it.
Inventors
- 👤 John Ernest Lewin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:24
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/103; A61B5/11; A61B5/113; A61B5/1135; Y; Y10; Y10S; Y10S5/00; Y10S5/94
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
An apnoea alarm system comprising an air mattress having a plurality of separate compartments, air-connection means between said compartments, means for detecting differential changes in compression between different ones of said compartments, a sensory alarm, and a switch for operating the alarm in the absence of any change in compression of the mattress after a preset time period from a last detected change in compression.
Claim 2
Dependent Claim
65 words
An apnoea alarm system comprising an air mattress having a plurality of separate compartments, air-connection means between said compartments, means for detecting differential changes in compression between different ones of said compartments, a sensory alarm, and a switch for operating the alarm in the absence of any change in compression of the mattress after a preset time period from a last detected change in compression.
Claim 3
Dependent Claim
48 words
The alarm system as claimed in claim 1 in which said air-connection means comprises a ducted outlet to each of said compartments and air connections between all said ducted outlets and in which the detection means comprises an anemometer for detecting airflow in any of the ducted outlets.
Claim 4
Dependent Claim
24 words
The alarm as claimed in claim 2 in which the ducted outlets are connected to a common chamber in which the anemometer is positioned.
Claim 5
Dependent Claim
14 words
The alarm as claimed in claim 2 in which the anemometer comprises a thermistor.
References Cited (Backward Citations)
US3325799A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |