Pulsed ultra sonic swimming pool alarm apparatus

Details Pulsed ultra sonic swimming pool alarm apparatus Pulsed ultra sonic swimming pool alarm apparatus

1990-11-29

1992-09-01

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340531, 340541, 340572, 367131, 367137, 441 80, G08B 1318, G08B 2100

Patent

active

051442850

ABSTRACT:
Pulsed ultrasonic apparatus for monitoring a swimming pool includes a transmitter housing securable to a child and provides a swept frequency pulsed output from a transducer within the housing when an electrical circuit is completed by having a pair of tabs on the outside of the housing immersed in water. The output from the transducer is detected by a receiving hydrophone and the hydrophone is connected to receiver circuitry which provides an appropriate alarm signal.

REFERENCES:
patent: 3500373 (1970-03-01), Minasy
patent: 3810146 (1974-05-01), Lieb
patent: 5033033 (1991-07-01), Schram
patent: 5049859 (1991-09-01), Arnell

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