Heat activated amusement device employing microencapsulated thermochromic liquid crystal
US5223958A · kind A · utility
32Cited by
15References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 3, 1992 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Apr 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1334
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A heat activated amusement device is stimulated, by the transfer of thermal energy from a person's body or a heated object, to reveal by color differentiation a hidden message or visual image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.