Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2000-07-25
2001-04-03
Maung, Nay (Department: 2681)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S550100, C455S571000
Reexamination Certificate
active
06212415
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a power adapter for a portable device, and more particularly to a power adapter having an integral radio frequency port for communication equipment.
BACKGROUND OF THE INVENTION
In portable battery-powered equipment, such as a cellular telephone or other communication device, an external power supply is usually provided so that the user can operate the equipment from household current or vehicle power current in order to conserve battery power. To operate the communication device inside a vehicle, power adapters are commonly designed to fit into the cigarette lighter socket provided in the vehicle. The other end of the power adapter plugs into an external power input connector of the device, or includes what is commonly known in the industry as a “battery eliminator” which replaces a detachable battery coupled to the telephone or communication device.
When operating a cellular telephone or other communication device within a vehicle, it is generally desirable to use an antenna mounted external to the vehicle to improve the performance of the telephone. Some telephones provide a radio frequency (RF) input/output port in addition to the external power input port so that an external antenna may be utilized. However, such a device requires two separate connectors. In other telephones, the external power input port and the RF input/output port are combined within a single connector of the device. However, such a device would typically require that either an external power supply or external antenna be connected.
Accordingly, there is a need to provide a simple, single cable vehicle power adapter which also provides RF input/output capability for connection to an external vehicle antenna.
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Motorola Technical Developments, vol. 19 Jun. 1, 1993, pp. 25-26. Ford et al., “Method for Automatic RF switching Based on Presence of Antenna,” Cited by French PTO Sep. 18, 1995.
Albert Mike M.
DeMuro David M.
Ford Robert
Kalenowsky John A.
Patino Joseph
Collopy Daniel R.
King John J.
Maung Nay
Motorola Inc.
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