Magnetic drawing board apparatus
US6722891B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2003 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Mar 12, 2023 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63F2009/065
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A magnetic drawing apparatus including image forming means, image erasing means, motion generating means, movement control means and a main housing, wherein:the image forming means include a plurality of magnetic cells which collectively define an image forming surface, the magnetic cell contains a viscous fluid and magnetic powder;the image erasing means include a magnetic image eraser which is adjacent to the image forming means, the magnetic image eraser is connected to the motion generating means and is movable relative to the image forming means; andthe movement control means include means for actuating the motion generating means and means for selecting the direction of movement of the magnetic image eraser with respect to the image forming means.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.