Underwater signalling device

Details Underwater signalling device Underwater signalling device

1984-07-20

1987-01-06

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Underwater system

Telemetering

367137, 367910, H04B 1100

Patent

active

046352422

ABSTRACT:
A portable, self-contained underwater signalling device adapted to be worn by a diver. A waterproof housing has contained therein an acoustic sound generator, a power source and a three-position switch and circuit board connected in circuit between the power source and sound generator. The three-position switch provides an off or open position, a momentary on position and a full on position. The circuit board may vary the frequency of the signal output of the sound generator when the switch is in the constant on position to generate a pulsed frequency or a constant frequency.

REFERENCES:
patent: 3267414 (1966-08-01), Kritz
patent: 3337841 (1967-08-01), Wainwright et al.
patent: 3686656 (1972-08-01), Richards
patent: 3786406 (1974-01-01), Bianco
patent: 3986161 (1976-10-01), Mackellar
patent: 4281404 (1981-07-01), Morrow, Jr. et al.

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