Research/Patents/US 5023616
US 5023616

MICROPHONE AMPLIFIER DETECTOR

Assignee

GERIG, JOHN S.

Filed

Aug 25, 1967

Granted

Jun 11, 1991

Location

11406 FIELDSTONE LANE, RESTON VIRGINIA 22091

Abstract

A device for detecting a covert transmitter having a time varying impedance therein including a radio frequency transmitter and an audio frequency transmitter which are directed so as to illuminate a target area. The audio tone drives the active elements into a non-linear mode of operation to modulate the transmitted radio frequency. The re-radiated energy is detected by a further radio frequency receiver.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Mar 12, 1982

Rescinded

May 4, 1990

Duration

8 years, 1 month

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