Method and apparatus for prohibiting unauthorized use of a telec

Details Method and apparatus for prohibiting unauthorized use of a telec Method and apparatus for prohibiting unauthorized use of a telec

1994-09-16

1996-08-06

Chin, Stephen

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

For detection of eavesdropping device

379 35, H04M 166

Patent

active

055442218

ABSTRACT:
A method and apparatus for prohibiting unauthorized use of a telecommunication line is provided. An interference signal is timely generated by the invention on the telecommunication line such that the illegitimate user may not dial the number correctly. Therefore, the invention may prohibit the unauthorized use of a telecommunication line.

REFERENCES:
patent: 4218592 (1980-08-01), Steinbergs et al.
patent: 5099515 (1992-03-01), Kobayashi et al.

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