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Class Information
Number: 84/3
Name: Music > Instruments > Automatic > Electric
Description: The instruments have electric circuits.

Sub-classes under this class:

Class Number Class Name Patents
84/6 Pneumatic 2
84/4 With phonograph 2

Patents under this class:

Patent Number Title Of Patent Date Issued
8664497 Double keyboard piano system Mar. 4, 2014
7807909 Musical instrument and supporting system incorporated therein for music players Oct. 5, 2010
7507895 Electronic musical instrument Mar. 24, 2009
6552251 Actuating device easily assembled and keyboard musical instrument equipped therewith Apr. 22, 2003
5925844 Piano with built-in electronic musical instrument Jul. 20, 1999
5663513 Keyboard musical instrument performable without noise in silent mode Sep. 2, 1997
5652403 Keyboard musical instrument allowing player to perform ensemble together with electronic sound system Jul. 29, 1997
5616880 Keyboard musical instrument equipped with hammer shank stopper where hammer assembly rebounds without deflection of shank Apr. 1, 1997
5583310 Keyboard musical instrument selectively introducing time delay into hammer detecting signal between acoustic sound mode and electronic sound mode Dec. 10, 1996
5444181 Keyboard instrument selectively entering into an acoustic sound mode and an electronic sound mode through a rotation of a stopper with a cushion sheet against damper wires Aug. 22, 1995
5434349 Keyboard instrument selectively entering into an acoustic mode and a silent mode through a sliding motion of a stopper Jul. 18, 1995
5428186 Keyboard instrument selectively entering into acoustic sound mode and silent mode through angular motion of key bed structure Jun. 27, 1995
5315060 Musical instrument performance system May. 24, 1994
5142961 Method and apparatus for stimulation of acoustic musical instruments Sep. 1, 1992
4983119 Musical candle actuated by thermistor switch Jan. 8, 1991
4704931 Acoustic tone inhibiting means for keyboard musical instrument Nov. 10, 1987

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