Security system for controlling building access
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United States of America Patent
Stats
-
Jul 30, 1996
Grant Date -
N/A
app pub date -
Oct 11, 1994
filing date -
Oct 11, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a security system for controlling access of persons through a controlled portal. The portal, such as a door, has a lock mechanism for securing the door. A presence detector senses the presence of an object within an approach zone located substantially adjacent the portal. When an object is detected, a fixed transceiver automatically transmits an interrogation signal into the approach zone. A portable transceiver is carried by the person seeking access to the portal. The portable transceiver responds to the interrogation signal by transmitting a response signal. Each portable transceiver or group of transceivers has a unique identification code which is included in the response signal. The fixed transceiver receives the response signal and determines whether the response signal contains a valid access code. If a valid access code is received, the portal is unlocked and other devices may be activated.
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Family
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