Portable radio telephone used with an adaptor unit having a hand

Details Portable radio telephone used with an adaptor unit having a hand Portable radio telephone used with an adaptor unit having a hand

1992-01-09

1994-11-22

Chin, Stephen

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 63, 379432, 379446, 379454, 455 89, 455 90, 455343, H04M 1100, H04B 138, H04B 116

Patent

active

053675568

ABSTRACT:
A portable radio unit used with an adaptor unit having a hand-free circuit is disclosed. The hand-free circuit is activated in response to a contact between a contact-type connector of the portable radio unit and a contact-type connector of the adaptor unit in the event that the portable radio unit being in a communication state is attached to the adapter unit. Power supply to the hand-free circuit is also initiated in response to the contact of the connectors.

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Digital Hands free adaptor, Motorola Inc., 1989.

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