← The Rospatent portfolio

RU19187U1 · filed 2000

Keyboard · with A. G. Salashchenko

Concave finger-rest zones formed from spherical-surface segments — one dome per finger’s home-row area — giving touch-typists a tactile reference.

Official Rospatent certificate for RU19187U1, with Alexander's own English translation, 2014.

Cross-section drawing from the RU19187U1 keyboard patent, showing the spherical finger-rest zones.

A keyboard mockup with the finger-rest zone keys marked out in black, demonstrating the RU19187U1 concept.