Carbonless duplicating systems
US4200313A · kind A · utility
3Cited by
2References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1979 |
| Grant date | Apr 29, 1980 |
| Priority date | — |
| Expiry date | Mar 12, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/913
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
3-[4-(Disubstituted-amino)phenyl] or (9-julolidinyl)-3-(diphenylamino)phthalides useful as color formers in pressure-sensitive and thermal marking systems are prepared by reaction of 2-[4-(disubstituted-amino)benzoyl] or (9-julolidinyl-carbonyl)benzoic acids with diphenylamines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.