Infrared absorber dyes
US5783377A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1996 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Sep 4, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C1/832
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A photographic element having a light sensitive layer and containing a dye of the formula (I): ##STR1## wherein: X.sub.1 and X.sub.2 each independently represents the atoms necessary to complete a 5- or 6-membered heterocyclic nucleus; PA1 X.sub.3 represents the atoms necessary to form a 5- or 6-membered ring structure, which may be substituted; PA1 R.sub.1 and R.sub.2 each independently represents a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group; PA1 R.sub.3 represents H, a substituted or unsubstituted alkyl group or a substituted or unsubstituted aryl group; PA1 r and s independently are 0 or 1; and PA1 W represents one or more counterions as needed to balance the charge of the molecule.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.