Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2006-01-24
2006-01-24
Trinh, Sonny (Department: 2687)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S550100, C455S553100, C455S465000, C455S463000, C455S462000, C379S419000, C379S440000
Reexamination Certificate
active
06990356
ABSTRACT:
A cordless telephone system comprising a base unit, at least one handset, and one or more expansion units is provided. The handset and the expansion units communicate with the base unit via communication channels implemented in a wireless communication protocol. The expansion units can provide the system with communication interfaces to various external networks, such as an additional analog telephone line, a digital telephone line, or a cellular telephone. Conference calling functionality is provided between handsets and expansion base units within the primary base unit. Data services can also be provided by a wireless expansion base unit.
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Charney Douglas
Ryley Gordon
Nguyen Khai
Pillsbury Winthrop Shaw & Pittman LLP
Trinh Sonny
VTech Telecommunications Limited
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