US3241966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleach fixing of photographic silver images
Assignee: Agfa Gevaert NV
•
Filing: 1961-06-09
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Granted: 1966-03-22
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Expires: 1981-06-09
Abstract
No abstract record available.
Inventors
- 👤 Heilmann Max
- 👤 Brachel Hanswilli Von
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:36
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/42; G03C7/421
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN A PROCESS FOR THE BLEACHING AND FIXING OF A PHOTOGRAPHIC SILVER HALIDE EMULSION WHICH COMPRISES SUBJECTING THE SAID EMULSION TO TREATMENT WITH A FIXING-BLEACHING COMPOSITION COMPRISING (A) A CONVENTIONAL BLEACHING AGENT OF THE GROUP CONSISTING OF COMPLEX SALTS OF TRIVALENT IRON AND AN ACID OF THE GROUP CONSISTING OF POLYCARBOXYLIC ACIDS AND NITROGEN-CONTAINING POLYCARBOXYLIC ACIDS, AND (B) A CONVENTIONAL FIXING AGENT CONSISTING OF A WATERSOLUBLE SALT OF THIOSULFURIC ACID, THE IMPROVEMENT OF SUBJECTING THE SAID EMULSION TO TREATMENT WITH A FIXING-BLEACH COMPOSITION WHICH CONTAINS IN DISSOLVED FORM, IN ADDITION TO THE TWO FOREGOING CONVENTIONAL INGREDIENTS, AT LEAST 0.01 GRAM PER LITER OF A SUBSTANCE OF THE GROUP CONSISTING OF POLYALKYLENE OXIDES HAVING THE FORMULA:
Claim 2
Dependent Claim
115 words
IN A PROCESS FOR THE BLEACHING AND FIXING OF A PHOTOGRAPHIC SILVER HALIDE EMULSION WHICH COMPRISES SUBJECTING THE SAID EMULSION TO TREATMENT WITH A FIXING-BLEACHING COMPOSITION COMPRISING (A) A CONVENTIONAL BLEACHING AGENT OF THE GROUP CONSISTING OF COMPLEX SALTS OF TRIVALENT IRON AND AN ACID OF THE GROUP CONSISTING OF POLYCARBOXYLIC ACIDS AND NITROGEN-CONTAINING POLYCARBOXYLIC ACIDS, AND (B) A CONVENTIONAL FIXING AGENT CONSISTING OF A WATERSOLUBLE SALT OF THIOSULFURIC ACID, THE IMPROVEMENT OF SUBJECTING THE SAID EMULSION TO TREATMENT WITH A FIXING-BLEACH COMPOSITION WHICH CONTAINS IN DISSOLVED FORM, IN ADDITION TO THE TWO FOREGOING CONVENTIONAL INGREDIENTS, AT LEAST 0.01 GRAM PER LITER OF A SUBSTANCE OF THE GROUP CONSISTING OF POLYALKYLENE OXIDES HAVING THE FORMULA:
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |