Apparatus exhibiting PTC behavior useful for displaying information
US4922242A · kind A · utility
24Cited by
10References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1987 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Nov 12, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/027
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An apparatus for displaying information comprising a resistive element, preferably a conductive polymer resistive element, adjacent to a thermochromic layer. When electrically powered, the resistive element heats the thermochromic layer above a transistion point causing the thermochromic layer to change from opaque to transparent. The resistive element exhibits PTC behavior and, therefore, does not overheat. The apparatus may be large in size and on a flexible substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.