Image producing system
US4186243A · kind A · utility
9Cited by
8References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1977 |
| Grant date | Jan 29, 1980 |
| Priority date | — |
| Expiry date | Feb 11, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2913
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An image producing system is provided, wherein an activator composition e.g. made up as a crayon or pencil, when contacted with paper substrate containing an azo color former yields an image by color change.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.