US2662014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for intensifying silver photographic images
Assignee: EIDP Inc
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Filing: 1952-07-17
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Granted: 1953-12-08
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Expires: 1972-07-17
Abstract
No abstract record available.
Inventors
- 👤 Umberger Jacob Quentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:05
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR INTENSIFYING A SILVER PHOTOGRAPHIC IMAGE WHICH COMPRISES TREATING A PHOTOGRAPHIC ELEMENT BEARING A SILVER IMAGE IN A WATER-PERMEABLE LAYER THEREOF, IN A AQUEOUS SOLUTION CONTAINING FERRICYANIDE IONS IN AN AMOUNT CORRESPONDING TO 0.5 TO 25.0 GRAMS PER LITER OF A SOLUBLE FERRICYANIDE COMPOUND AND AT LEAST ONE CATION WHICH FORMS RELATIVELY INSOLUBLE FERROCYANIDE AND CHROMATE COMPOUNDS IN AN AMOUNT EQUIVALENT TO 1.0 TO 25.0 GRAMS PER LITER OF LEAD NITRATE AND TREATING THE RESULTING RELATIVELY INSOLUBLE FERROCYANIDE SALT IMAGE IN AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE POLYVALENT METAL CATION WHICH FORMS A RELATIVELY WATER-INSOLUBLE FERROCYANIDE COMPOUND IN AN AMOUNT EQUIVALENT TO 0.01 TO 0.1 MOLAR CONCENTRATION OF FERRIC SALT AND AT LEAST ONE BLUE-LIGHTABSORBING COMPLEX OXIDE ANION OF HEXAVALENT CHROMIUM IN AN AMOUNT EQUIVALENT TO 0.5 TO 25.0 GRAMS PER LITER OF SODIUM CHROMATE.
Claim 2
Dependent Claim
138 words
A PROCESS FOR INTENSIFYING A SILVER PHOTOGRAPHIC IMAGE WHICH COMPRISES TREATING A PHOTOGRAPHIC ELEMENT BEARING A SILVER IMAGE IN A WATER-PERMEABLE LAYER THEREOF, IN A AQUEOUS SOLUTION CONTAINING FERRICYANIDE IONS IN AN AMOUNT CORRESPONDING TO 0.5 TO 25.0 GRAMS PER LITER OF A SOLUBLE FERRICYANIDE COMPOUND AND AT LEAST ONE CATION WHICH FORMS RELATIVELY INSOLUBLE FERROCYANIDE AND CHROMATE COMPOUNDS IN AN AMOUNT EQUIVALENT TO 1.0 TO 25.0 GRAMS PER LITER OF LEAD NITRATE AND TREATING THE RESULTING RELATIVELY INSOLUBLE FERROCYANIDE SALT IMAGE IN AN AQUEOUS SOLUTION CONTAINING AT LEAST ONE POLYVALENT METAL CATION WHICH FORMS A RELATIVELY WATER-INSOLUBLE FERROCYANIDE COMPOUND IN AN AMOUNT EQUIVALENT TO 0.01 TO 0.1 MOLAR CONCENTRATION OF FERRIC SALT AND AT LEAST ONE BLUE-LIGHTABSORBING COMPLEX OXIDE ANION OF HEXAVALENT CHROMIUM IN AN AMOUNT EQUIVALENT TO 0.5 TO 25.0 GRAMS PER LITER OF SODIUM CHROMATE.
References Cited (Backward Citations)
US2171609A
Cited
FR898431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |