Research/Patents/US 4975886
US 4975886

DETECTING AND RANGING SYSTEM

Assignee

Filed

May 24, 1960

Granted

Dec 4, 1990

Location

Abstract

This invention relates to detecting and ranging on energy sources and morearticularly to ascertaining the presence and range of sound emitting sources by passive apparatus.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Jul 22, 1982

Rescinded

Jun 25, 1990

Duration

7 years, 11 months

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