Patent US3558314A successfully refreshed from Google Patents.
US3558314A
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US
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Process for increasing the sensitivity of photographic silver halide emulsions
Assignee: Agfa Gevaert AG
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Filing: 1966-11-04
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Granted: 1971-01-26
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Expires: 1986-11-04
Abstract
Abstract LIGHT-SENSITIVE SILVER HALIDE MATERIAL CONTAINING AS A SENSITIZER A WATER SOLUBLE QUATERNARY COMPOUND HAVING THE GENERAL FORMULA: -(N(+)(-Y)2-Z-N(+)(-Y)2-R)N- (X(-))2N WHEREIN Y IS A RADICAL SELECTED FROM THE GROUP CONSISTING OF ALKYL, PHENYLALKYL, HYDROXYALKYL, ALKOXYALKYL, ACYLOXYALKYL, AMINOALKYL, ALKYLAMINOALKYL AND ACYLAMINOALKYL, THE ALKYL GROUP OF THE RADICAL HAVING UP TO 18 CARBON ATOMS; R AND Z ARE DIVALENT ORGANIC RADICALS, AT LEAST ONE OF WHICH IS A POLYALKYLENE OXIDE GROUP, X IS AN ANION AND N IS A NUMBER FROM 2 TO 100 AND A PROCESS FOR IMPROVING THE SENSITIVITY OF A LIGHT-SENSITIVE SILVER HALIDE EMULSION.
Inventors
- 👤 Harald Hueckstaedt
- 👤 Wilhelm Saleck
- 👤 Herbert Mueller
- 👤 August Randolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:57
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/043
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |