Spectrally sensitized silver halide emulsions
Abstract
Abstract Novel merocyanine dyes are provided which correspond to the general formula : WHEREIN : Z represents the atoms necessary to close an oxazole nucleus, R1 stands for sulphatoalkyl, phosphonoalkyl or AWNHVB wherein each of W and V represents carbonyl, sulphonyl or a single bond, at least one of W and V being sulphonyl, A stands for alkylene and B stands for hydrogen, an alkyl group or an amino group, B not being hydrogen when V stands for carbonyl or sulphonyl, and EACH OF R2, R3 and R4 stands for hydrogen, an aliphatic group or an aryl group one of R3 and R4 being an aliphatic group or aryl group substituted by sulpho, carboxy or alkoxycarbonyl, THE ACIDIC GROUPS BEING IN THE FREE ACID FORM OR SALT FORM. These merocyanine dyes can be used for the spectral sensitization of light-sensitive silver halide emulsions. They do not enhance the fog and leave practically no residual stain after processing and therefore are particularly suitable for the sensitization of Lippmann-emulsions, emulsions of the lith-type and emulsions used in stabilisation processing.
Inventors
- 👤 H Depoorter
- 👤 T Ghys
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |