Photographic fine grain silver halide emulsions
Abstract
Abstract A PROCESS OR PREPARING FINE-GRAIN LIGHT-SENSITIVE SILVER HALIDE EMULSIONS OF THE LIPPMANN TYPE IS DESCRIBED WHEREIN PRECIPITATION OF THE SILVER HALIDE GRAINS OCCURS IN THE PRESENCE OF A COMPOUND OF THE FORMULA: Z-A-X WHEREIN EACH OF Z AND X STANDS FOR A HETEROCYCLE COMPRISING THE MOIETY=N-AND A REPRESENTS A CHEMICAL BOND ALKYLENE, ALKYLENE INTERRUPTED BY OXYGEN OR -N (R)-, R BEING HYDROGEN OR C1-C4 ALKYL, ARYLENE, ALKENYLENE OR~S-ALKYLENE-S~OR~S-ALKYLENE~THE ALKYLENE GROUPS OF WHICH MAY BE INTERRUPTED BY OXYGEN OR THE GROUP -N(R)-. THE AVERAGE SILVER HALIDE GRAIN SIZE CAN BE REDUCED TO LESS THAN 50 NM. THE EMULSIONS SHOW A HIGH DIFFRACTION EFFICIENCY AND A HIGH SIGNAL TO NOISE RATIO.
Inventors
- 👤 Robert Joseph Pollet
- 👤 Herman Adelbert Philippaerts
- 👤 Jozef Frans Willems
- 👤 Frans Henri Claes
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |