Compositions, process and systems
US4636820A · kind A · utility
7Cited by
0References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 17, 1985 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | Jan 17, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41M5/1366
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
3-[(Substituted-amino)(aryl or heteroaryl)methyl]-1H-indoles which are useful as color-formers in pressure-sensitive carbonless duplicating systems and thermal marking systems are prepared by reacting 3-[(arylsulfonyl)(aryl or heteroaryl)methyl]-1H-indoles with amines or precursors thereof in the presence of a base.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.