Keyboard Patents

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A gallery of patents that describe technologies or illustrate designs relating to IBM and family keyboards, typewriters and keypunches. This includes keyswitch/actuator designs, ornamental designs (overall appearance), integrated pointing devices such as TrackPoints, and host systems such as PCs, laptops, terminals, consoles and electronic typewriters. All illustrations provided are from the patents themselves, which are believed to be within the public domain. A total of 112 patents have been recorded. The patent list is currently filtered to 1 patent(s).

U.S. Utility Patent 5,570,111 (US5570111A)

Applied 3 Oct 1994

Published 29 Oct 1996

Expired 3 Oct 2014

More info

Name	Graphical user interface cursor positioning device having a negative inertia transfer function
Inventors	Robert C. Barrett, Robert S. Olyha, Jr., Joseph D. Rutledge
Assignees	IBM
Description	An invention of a formula and system for providing 'negative inertia' in pointing stick movement, referring to countering the feeling of sluggishness (having inertia) in earlier designs. It is implemented in the TrackPoint III and TrackPoint IV pointing sticks' firmware and applied before any data for cursor movement reaches the host computer.