Reversible colorful writing apparatus
US6733298B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Jan 30, 2003 |
| Grant date | May 11, 2004 |
| Priority date | — |
| Expiry date | May 19, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43L1/008
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A reversible colorful writing apparatus includes a reversible writing board composed of a plurality of coloring picture tubes each filled with a plurality of immiscible coloring liquids in each coloring picture tube and suspended with a miniature magnet within each picture tube, and an inkless writing pen having a stepping-motor control circuit provided within the writing pen; whereby upon moving of the pen on the board, the stepping-motor control circuit will drive the miniature magnet forwardly (or reversely) in each 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 such a specific magnet position will be driven to the top surface of the picture tube to display such a specific color on the board.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.