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US3672901A
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Process of precipitating silver halide in the presence of a colloid and a water-soluble iron salt
Assignee: Fujifilm Holdings Corp
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Filing: 1970-05-15
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Granted: 1972-06-27
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Expires: 1990-05-15
Abstract
Abstract A PROCESS FOR PRODUCING A SILVER HALIDE PHOTOGRAPHIC EMULSION INCLUDING A STEP OF PRECIPITATING A SILVER HALIDE IN A COLLOIDAL SOLUTION BY REACTION BETWEEN A HALIDE AND A SILVER SALT, CHARACTERIZED IN THAT SAID PRECIPITATION IS DONE IN THE PRESENCE OF A WATER-SOLUBLE IRON COMPOUND IN AN AMOUNT OF 10-7 TO 10-3 MOL PER MOL OF THE SILVER SALT CONTAINED IN SAID SOLUTION.
Inventors
- 👤 Kinji Ohkubo
- 👤 Junpei Noguchi
- 👤 Kunioki Ohmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:07
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08
Claims Analysis
Total Claims: 0
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References 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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |