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Patent US2943935A successfully refreshed from Google Patents.
US2943935A
Expired / Lapsed
US
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Stabilization of photographic bleach powders containing an alkali metal ferricyanide
Assignee: GAF Chemicals Corp
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Filing: 1957-05-15
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Granted: 1960-07-05
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Expires: 1977-05-15
Abstract
No abstract record available.
Inventors
- 👤 Lawrence G Welliver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:32
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A STABLE SINGLE POWDER PHOTOGRAPHIC BLEACH MIXTURE CONTAINING AS ITS ESSENTIAL COMPONENTS FROM 30 TO 120 PARTS BY WEIGHT OF AN ALKALI METAL FERRICYANIDE, FROM 2 TO 20 PARTS BY WEIGHT OF AN ALKALI METAL BROMIDE, FROM 4 TO 25 PARTS OF BORIC ANHYDRIDE AND FROM 2 TO 12 PARTS BY WEIGHT OF AN ALKALI METAL FERROCYANIDE, THE PARTS BEING BASED ON THE TOTAL WEIGHT OF THE POWDER.
Claim 2
Dependent Claim
68 words
A STABLE SINGLE POWDER PHOTOGRAPHIC BLEACH MIXTURE CONTAINING AS ITS ESSENTIAL COMPONENTS FROM 30 TO 120 PARTS BY WEIGHT OF AN ALKALI METAL FERRICYANIDE, FROM 2 TO 20 PARTS BY WEIGHT OF AN ALKALI METAL BROMIDE, FROM 4 TO 25 PARTS OF BORIC ANHYDRIDE AND FROM 2 TO 12 PARTS BY WEIGHT OF AN ALKALI METAL FERROCYANIDE, THE PARTS BEING BASED ON THE TOTAL WEIGHT OF THE POWDER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |