Fluoran compounds
US4629800A · kind A · utility
8Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1985 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Mar 1, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D493/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Fluoran compounds of the structural formula: ##STR1## wherein R.sub.1 is propyl or butyl, R.sub.2 is an alkyl of from one to four carbon atoms, R.sub.3 is methyl or ethyl, and R.sub.4 is hydrogen or methyl are particularly suitable for use in providing high quality pressure, heat or electrothermal sensitive recording sheets containing a color former in operative association with an electron-accepting substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.