Apparatus to prevent unauthorized use of telephone lines

Details Apparatus to prevent unauthorized use of telephone lines Apparatus to prevent unauthorized use of telephone lines

1997-01-31

1999-03-30

Loomis, Paul

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

For detection of eavesdropping device

379 35, 379 27, H04M 124

Patent

active

058898360

ABSTRACT:
An apparatus comprising a pair of sensors for monitoring the status of a telephone line and a local station which detects unauthorized use and causes actuation of a disruption signal to make the telephone line unusable.

REFERENCES:
patent: 4760592 (1988-07-01), Hensley
patent: 5436959 (1995-07-01), Dake et al.
patent: 5544221 (1996-08-01), Sheng et al.

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