Magnetic writing screen dispersion medium
US6878306B2 · kind B2 · utility
1Cited by
11References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 24, 2001 |
| Grant date | Apr 12, 2005 |
| Priority date | — |
| Expiry date | Dec 12, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43L5/005
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A magnetic dispersion medium is used in a magnetic writing screen toy. The dispersion medium is attracted to the underside of the screen when a magnetic tipped pen is passed over the upper surface of the screen. A user can create drawings and figures. The dispersion medium is non-toxic, creates lines having good contrast and can be easily erased without permanently forming black marks on the screen. The dispersion medium works well in temperature ranges between −20° C. to 45° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.