Communications: electrical – Continuously variable indicating – With meter reading
Patent
1994-10-11
1996-07-30
Horabik, Michael
Communications: electrical
Continuously variable indicating
With meter reading
340572, 340825310, 235382, 49 31, G08B 1318, G06F 704, E05B 4702
Patent
active
055415857
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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Duhame Dean C.
Meyvis Daniel V.
Horabik Michael
Stanley Home Automation
Wilson Jr. William H.
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