Pressure sensitive carbonless imaging system incorporating uncolored ferric organophosphates and uncolored chelates
US4902667A · kind A · utility
5Cited by
13References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1988 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Aug 25, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/914
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Pressure sensitive imaging materials are colorless until pressure addressed, but thereafter provide an intense dark image. The materials comprise white ferric organophosphate, ferric organophosphinate, or ferric organophosphonate and a colorless chelate. The choice of substituents on the chelate nucleus can give images with both good discrimination visually and to near infrared radiation (NIR).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.