US3689273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsion containing sulfur or selenium sensitizer and hydroxy tetra-azaindene stabilizer
Assignee: Agfa Gevaert NV
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Filing: 1970-10-27
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Granted: 1972-09-05
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Expires: 1990-10-27
Abstract
Abstract A PHOTOGRAPHIC SILVER HALIDE EMULSION WHEREIN THE SILVER HALIDE HAS BEEN CHEMICALLY RIPENED IN AN AQUEOUS HYDROPHILIC COLLOID MEDIUM COMPRISING AS A CHEMICAL SENSITIZER AN ALIPHATIC OR AROMATIC SULPHIDE OR SELENIDE COMPRISING AT LEAST THREE SULPHUR AND/OR SELENIUM ATOMS LINKED TOGETHER AND AS A STABILIZER AGAINST FOG FORMATION A HYDROXY TETRA-AZAINDENE COMPOUND, AND THE METHOD OF PREPARING THE EMULSION IS DESCRIBED. THE EMULSION HAS SUPERIOR SENSITIVITY AND REDUCED FOG PARTICULARLY UPON STORAGE.
Inventors
- 👤 Jozef Frans Willems
- 👤 Jules Robert Berendsen
- 👤 Robert Joseph Pollet
- 👤 Antoon Leon Vandenberghe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:32
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346; G03C1/08; G03C1/09
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |