Patent ID: 6733298
Filing Date: 2004-05-11
Classification: B43L

Abstract:
A reversible colorful writing apparatus comprising: a reversible writing board composed of a plurality of coloring picture tubes each said coloring picture tube having a plurality of immiscible coloring liquids filled in each said coloring picture tube and having a miniature magnet suspended within each said picture tube; and an inkless writing pen having a stepping-motor control circuit formed within the writing pen, said stepping-motor control circuit operatively driving said miniature magnet in each said picture tube when said writing pen movably contacting said picture tube; whereby upon moving of the pen to one said picture tube on the board, the stepping-motor control circuit will drive the miniature magnet forwardly or reversely in said picture tube to drive the immiscible coloring liquids forwardly or reversely; and upon setting of the magnet at a specific position in the tube, a specific coloring liquid corresponding to the specific position of the magnet in the tube will be driven to the top surface of the picture tube to display the color of said specific coloring liquid on the writing board.