Research/Patents/US 4939697
US 4939697

VARIABLE FOCUSING SONAR

Assignee

Filed

Oct 22, 1968

Granted

Jul 3, 1990

Location

Abstract

The received signal from an acoustic echo detection and ranging system is mpared with internally generated signals indicating the focus of a variable focus transducer. Logic circuits in the signal comparison channel develop control voltages to focus said transducer upon a predetermined area from which said received signal originates.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jan 22, 1982

Rescinded

Feb 21, 1990

Duration

8 years, 1 month

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