U.S. Utility Patent 5,521,596 (US5521596A)

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Provided by the ASK Keyboard Patents database

Applied 29th November 1990

Published 28th May 1996

Expired 28th May 2013

More informaion

Name	Analog input device located in the primary typing area of a keyboard
Inventors	Edwin J. Selker, Joseph D. Rutledge
Description	An invention for a keyboard pointing device in either the form of a pointing stick placed inbetween keys or under-keycap mounted device, using strain gauges or various other sensor technologies. The stick idea was implemented as the IBM TrackPoint II (stain gauge) and 'Lexmark-Unicomp' (FSR) pointing sticks.

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