Title: Method and apparatus for simulating a mechanical keyboard action in an electronic keyboard
Type: issued patent
Patent number: 7,166,795
Issue date: January 23, 2007
Filing date: March 19, 2004
Link to PDF: 
AIPW Summary: An electronic keyboard that simulates the keyboard of a piano or organ. Sensors capture a user’s finger movements on the electronic keyboard (which includes an actuator) and simulates the effects (both sounds and feedback) that would have occurred on a real piano or organ keyboard. The electronic keyboard can be programmed to simulate a variety of different musical keyboard types, including specific models of piano.