06243595 is referenced by 42 patents and cites 16 patents.

A portable cellular telephone comprising a main body for housing at least a microcontroller, a display screen, an audio receiver and a microphone. An extendible section that houses a number of function keys such as the standard telephone keys, slides out of the main body to expose the display screen in its entirety. The extendible section also includes LED's to back light the keys when desirable. The electrical connections between the extendible section and the main body are achieved through wiper contacts in the main body that slide over conductive strips on the under surface of the extendible section. The keys in the extendible section are each connected to resistors of different values, these resistor/key combinations are all connected in parallel to two conductive strips. A resistor bridge is formed by connecting a resistor in the main body to the resistor key combinations. The voltage change at the junction between the resistor and the combinations is detected to sense the closure of a key, and the voltage value is used to identify the key that is closed. The device also detects when the extendible section is in the open or closed positions. The extendible section is mounted such that it will detach from the main body when a force is applied to it such as by dropping the telephone; the section may be simply replaced by snapping it back into place without damage to the telephone.

Title
Portable wireless communication device having an extendible section
Application Number
9/97592
Publication Number
6243595 (B1)
Application Date
June 16, 1998
Publication Date
June 5, 2001
Inventor
Henry C Mok
Kanata
US
Michael J Craven
Ottawa
US
Arlan J Anderson
Ottawa
US
Michael C G Lee
Ottawa
US
Agent
Smart & Biggar
US
Agent
Dennis R Haszko
US
Assignee
Nortel Networks
US
IPC
H04B 1/38
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