Patent ID: 8449208

Claim:
A keyboard for a wireless handheld mobile communication device, the keyboard comprising: a keyfield comprising a plurality of depressible keys arranged in rows that are distributed about a vertical centerline of the keyboard; and each of the depressible keys has a top engagement surface having a single centrally-disposed diagonal ridge of which: a first portion slopes downwardly to an edge of the top engagement surface from a centrally-disposed diagonal ridge; and a second portion slopes downwardly to another edge of the top engagement surface from the centrally-disposed diagonal ridge; wherein the centrally-disposed diagonal ridges for a plurality of the depressible keys on a first side of the vertical centerline of the keyboard are similarly aligned to one another at a first angle and the centrally-disposed diagonal ridges for a plurality of the depressible keys on a second side of the vertical centerline of the keyboard are similarly aligned to one another at a second angle, which second angle is different from the first angle.