US3810146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm system for the safety of non-swimmers
Assignee: Individual
•
Filing: 1972-12-13
•
Granted: 1974-05-07
•
Expires: 1992-12-13
Abstract
Abstract An alarm system for the safety of non-swimmers comprises a portable transmitter which is adapted to be attached to the body of the non-swimmer and to be activated on immersion in water, and a receiver adapted to operate an alarm on receiving the transmitted signal. The transmitted signal is a mechanical wave having a frequency which is ultrasonic.
Inventors
- 👤 S Lieb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:32
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/02; G08B21/08; G08B21/088; Y; Y10; Y10S; Y10S367/00; Y10S367/91
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
78 words
An alarm system for the safety of non-swimmers comprising a portable transmitter adapted to be attached to the body of a nonswimmer, means on the transmitter to actuate the transmitter on immersion in a body of water, a sensor adapted to be immersed in the body of water and further adapted to sense the output of the transmitter when actuated, and means to amplify the sensed signal and operate an alarm located out of the body of water.
Claim 2
Dependent Claim
78 words
An alarm system for the safety of non-swimmers comprising a portable transmitter adapted to be attached to the body of a nonswimmer, means on the transmitter to actuate the transmitter on immersion in a body of water, a sensor adapted to be immersed in the body of water and further adapted to sense the output of the transmitter when actuated, and means to amplify the sensed signal and operate an alarm located out of the body of water.
Claim 3
Dependent Claim
33 words
An alarm system as claimed in claim 1 in which the actuating means on the transmitter comprises two electrodes which are adapted to be electrically bridged by the electrical conductivity of the water.
Claim 4
Dependent Claim
17 words
An alarm system as claimed in claim 2 in which the electrodes are exposed to the water.
Claim 5
Dependent Claim
23 words
An alarm system as claimed in claim 2 in which the transmitter has an output stage in the form of an electro-mechanical transducer.
Claim 6
Dependent Claim
18 words
An alarm system as claimed in claim 4 in which the output frequency of the transducer is ultrasonic.
Claim 7
Dependent Claim
20 words
An alarm system as claimed in claim 5 in which the frequency is in the range 50 - 70 Kc/s.
Claim 8
Dependent Claim
16 words
An alarm system as claimed in claim 1 in which the sensor comprises an electro-mechanical transducer.
Claim 9
Dependent Claim
15 words
An alarm system as claimed in claim 6 in which the amplifying means is frequency-selective.
Claim 10
Dependent Claim
15 words
An alarm system as claimed in claim 1 in which the alarm comprises a loudspeaker.
Claim 11
Dependent Claim
103 words
A swimming pool alarm system for the safety of non-swimmers comprising a portable transmitter adapted to be attached to the body of the non-swimmer, means on the transmitter to actuate the transmitter on immersion in the swimming pool water, a sensor situated below the surface of the swimming pool water and adapted to sense the output of the transmitter when actuated, means connected to the sensor and adapted to amplify the sensed signal and an alarm situated out of the swimming pool water connected to the amplifying means and adapted to be operated by the amplifying means in response to the sensed signal.
Claim 12
Dependent Claim
103 words
A swimming pool alarm system for the safety of non-swimmers comprising a portable transmitter adapted to be attached to the body of the non-swimmer, means on the transmitter to actuate the transmitter on immersion in the swimming pool water, a sensor situated below the surface of the swimming pool water and adapted to sense the output of the transmitter when actuated, means connected to the sensor and adapted to amplify the sensed signal and an alarm situated out of the swimming pool water connected to the amplifying means and adapted to be operated by the amplifying means in response to the sensed signal.
Claim 13
Dependent Claim
37 words
A swimming pool alarm system as claimed in claim 10 in which the transmitter actuating means comprises two electrodes on the transmitter which are adapted to be electrically connected by the conductivity of the swimming pool water.
Claim 14
Dependent Claim
28 words
A swimming pool alarm system as claimed in claim 10 in which the transmitter output stage comprises an electromechanical transducer adapted to vibrate at a predetermined ultrasonic frequency.
Claim 15
Dependent Claim
28 words
A swimming pool alarm system as claimed in claim 10 in which the amplifier is tuned to receive only the frequency of the signal transmitted by the transmitter.
References Cited (Backward Citations)
US3273138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |