Stabilization of thermal images
US5210064A · kind A · utility
16Cited by
22References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1991 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Nov 20, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/323
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The addition, to a thermal imaging medium comprising a color-forming compound which undergoes a change of color upon heating above a color-forming temperature for a color-forming time, the color-forming compound being of the cyclic sulfonamide type described in U.S. Pat. Nos. 4,720,449 and 4,960,901, of a quinone or hydroquinone increases the sensitivity of the imaging medium and helps to prevent fading of images produced therefrom while the images are being projected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.