Local combined telephone and alarm system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Sep 28, 2004
Grant Date -
N/A
app pub date -
Feb 25, 2002
filing date -
Jun 3, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention concerns a local combined telephone and an alarm system comprising a central base communicating through two-way radio channel, according to a multiple access communication protocol, with telephone stations and detectors adapted to detect an emergency situation. The base transmits at regular intervals of less than 10 minutes, scanning messages addressed to the detectors and determines whether the detectors are operating, depending on whether it receives clearance messages from the detectors.
First Claim
Family
International Classification(s)
Cited Art Landscape
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