Music – Instruments – Stringed
Reexamination Certificate
2008-03-20
2010-10-12
Warren, David S. (Department: 2837)
Music
Instruments
Stringed
C084S646000, C084S722000
Reexamination Certificate
active
07812233
ABSTRACT:
An aiding device, “E-Z Master Chord”, for playing fretted string instruments, such as an acoustic guitar played by a beginner, is provided. The aiding device according to the current application is engaged over frets of an acoustic guitar to generate a chord with only two fingers of a player. The aiding device is comprised of: including but not limited to; 12 two position key pads installed on the key pad box; 7 single position key pads installed on the key pad box; a strap harness that engages the key box to fret portion of a guitar; an electronic circuit board installed inside of the keyboard box just below the key pad; a memory device installed inside the keyboard box just above the circuit board; a plurality of electromagnetic actuators installed inside of the key pad box just below the circuit board; a metal spring installed inside of the key pad box just below the electromagnetic actuators; a plurality of pressing pins installed inside of the keyboard box just below the metal spring and over strings of the guitar; a rechargeable battery installed inside of the key pad box, each key in the set of 12 keys can play two kinds of chord for creating ‘major’ and ‘minor’ sonorities; where, Each key in the set of 7 keys has a specific function to add one or two extra tones for chord ‘inversions’, ‘7’, ‘9’, ‘augmented’, and ‘diminished’ sonorities.
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