Toy for producing a concealed message and revealing a received concealed message
US6354631B1 · kind B1 · utility
1Cited by
3References
19Claims
0Family size
Inventor
Key dates
| Filing date | Mar 22, 2000 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Mar 22, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63H33/22
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A toy for producing a concealed message by producing a message on a message paper including a busy reddish pattern and for revealing a concealed message from a second party on a message paper including a busy reddish pattern by viewing the message under a translucent member having a similar red color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.