Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2008-04-22
2008-04-22
Tran, CongVan (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S421000, C455S456100
Reexamination Certificate
active
11511723
ABSTRACT:
The disclosed invention relates to a system for restricting radio frequency transmissions within a restricted area and more particularly to a mechanism for overriding the restriction of radio frequency transmissions within a restricted area using an override mechanism. A restricted area is defined wherein all radio frequency transmissions are restricted. Within the restricted a plurality of cellular telephones is disposed, each with a radio frequency transmitter and a radio frequency receiver. An emergency override is also disposed within the restricted area, the emergency override capable of selectively enabling communications of a selected subset of the cellular telephones disposed within the restricted area.
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