H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/3, 379/83
H04M 1/72 (2006.01) H04M 1/68 (2006.01)
Patent
CA 1144672
ABSTRACT OF THE DISCLOSURE A compact telephone intruder alarm system is operative for indicating to a current on-line user of a primary extension telephone which is already interconnected with the telephone line of the subsequent interconnection and disconnection of another auxiliary extension telephone with the same telephone line. Electrical OFF-and ON-hook signals are respectively generated each time an extension telephone is interconnected or disconnected with the telephone line, and each such hook signal is successively detected and electrically amplified before being conducted to a light-emitting diode. The first detected OFF-hook signal indicates the start of the inter- connection of the auxiliary extension telephone, and the second detected ON-hook signal indicates the duration and the end of the intruder presence on the telephone line. All electrical components are of miniature size and in one embodiment are mounted within the handset to simplify and to make installation less discernible. The light-emitting diode is readily view- able during conversation because it is mounted directly on the handset and instantly conveys the intrusion to the user. In another embodiment, the electrical components are mounted remotely from the handset.
341035
Cohen Eric
Korwin Paul
Cose Technology Corporation
Swabey Ogilvy Renault
LandOfFree
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