Research/Patents/US 4939699
US 4939699

SONAR SYSTEM

Assignee

Filed

Dec 8, 1966

Granted

Jul 3, 1990

Location

SUNNYSIDE FL US

Abstract

A sonar system having a sonar transmitter which is programmed to broadcastwo sets of several increasing frequency signals, with the frequency gap between each set thereof sufficient to cause them to distinguish between deep and shallow water targets, respectively. A heterodyne receiver receives target echoes of said sets of several frequency signals and converts them to two sets of identical frequency signals which are then readout as a single continuous target display signal.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Oct 28, 1981

Rescinded

Feb 21, 1990

Duration

8 years, 3 months

Inventor

  • 1FRANCIS J. MURPHREE

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records