Stabilization of thermal images
US5206208A · kind A · utility
5Cited by
43References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1991 |
| Grant date | Apr 27, 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 PA0 compound being of the cyclic sulfonamide type described in U.S. Pat. Nos. 4,720,449 and 4,960,901, of a source of zinc, nickel, copper(II), cobalt(II) or aluminum(III) cations 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.