Patent US3556797A successfully refreshed from Google Patents.
US3556797A
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Cobalt (ii) and manganese (ii) chelates as photographic emulsion antifoggants
Assignee: Agfa Gevaert NV
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Filing: 1968-04-19
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Granted: 1971-01-19
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Expires: 1988-04-19
Abstract
Abstract PHOTOGRAPHIC LIGHT-SENSITIVE SILVER HALIDE EMULSIONS ARE DESCRIBED WHICH INCLUDE A COBALT (II) OR A MANGANESE (II) CHELATE OF A (POLY) AMINO-(POLY)CARBOXYLIC ACID IN ACID FORM OR IN THE FORM OF A WATER-SOLUBLE SALT. THESE MATERIALS EXERT AN EXCELLENT STABILIZING AND FOG-INHIBITING ACTION UPON THE PHOTOGRAPHIC LIGHT-SENSITIVE MATERIALS.
Inventors
- 👤 Hendrik Adolf Pattijn
- 👤 Robrecht Julius Thiers
- 👤 Bernard Hippoliet Tavernier
- 👤 Jozef Frans Willems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:41
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/36; C07D213/38; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/3804; C07F9/3808
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |