Photographic element containing monodispersed unfogged silver halide grains chemically sensitized internally and externally
Abstract
Abstract IMPROVED PROCESSES ARE DISCLOSED FOR OBTAINING POSITIVE IMAGES IN AN UNFOGGED, SILVER HALIDE EMULSION WHEREIN A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT AND SAID EMULSION ARE IMAGE-WISE-EXPOSED AND THEN EITHER (1) DE VELOPED IN A SURFACE DEVELOPER IN THE PRESENCE OF A SILVER HALIDE FOGGING AGENT OR (2) GIVEN A LIGHT FLASH DEVELOPMENT IN A SURFACE DEVELOPER. IN ONE ASPECT, THE SILVER HALIDE EMULSIONS OF THIS INVENTION ARE INTERNAL-IMAGE EMULSIONS COMPRISING SILVER HALIDE GRAINS WHICH PREFERABLY HAVE METAL DOPANTS OCCLUDED THEREIN AND WHEREIN SAID GRAINS HAVE BEEN CHEMICALLY SENSITIZED ON THE SURFACE THEREOF TO A LEVEL LESS THAN THAT WHICH WOULD PROVIDE A SUBSTANTIAL DENSITY IN KODAK DEVELOPER DK-50 AFTER AN IMAGEWISE EXPOSURE WHEN SAID EMULSIONS ARE COATED AT A COVERAGE OF BETWEEN 300 TO 400 MG. OF SILVER PER FT.2.
Inventors
- 👤 F Evans
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |