US PATENT SUBCLASS 455 / 555
.~.~ Wireless private branch exchange (PBX) (i.e., wireless link to extension unit)

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

73  DF  TRANSMITTER AND RECEIVER AT SAME STATION (E.G., TRANSCEIVER) {9}
550  DF  .~ Radiotelephone equipment detail {17}
555.~.~ Wireless private branch exchange (PBX) (i.e., wireless link to extension unit)

DEFINITION

Classification: 455/555

Wireless private branch exchange (PBX) (i.e., wireless link to extension unit):

(under subclass 550) Subject matter wherein a telephone switching unit is equipped to communicate via radio frequency link to a wireless extension unit.