US2579435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of inhibiting color decomposition of dyes present in color photographs
Assignee: GAF Chemicals Corp
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Filing: 1950-04-12
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Granted: 1951-12-18
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Expires: 1970-04-12
Abstract
No abstract record available.
Inventors
- 👤 Mackey E Scudder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:36
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
IN A PROCESS FOR PRODUCING COLOR PHOTOGRAPHIC IMAGES IN A MULTICOLOR PHOTOGRAPHIC EMULSION BY EXPOSING THE EMULSION, COLOR DEVELOPING, BLEACHING, FIXING AND WASHING THE SAME, THE IMPROVEMENT WHICH COMPRISING PREVENTING THE FORMATION OF STAIN AFTER THE WASHING OPERATION BY RINSING THE SAID COLORED PHOTOGRAPHIC IMAGE WITH AN AQUEOUS SOLUTION CONTAINING, IN AN ANTI-STAINING AMOUNT, A WATERE-SOLUBLE ADDITION PRODUCT OF FORMALDEHYDE AND A UREA SELECTED FROM THE CLASS CONSISTING OF THOSE HAVING THE FOLLOWING FORMULA:
Claim 2
Dependent Claim
74 words
IN A PROCESS FOR PRODUCING COLOR PHOTOGRAPHIC IMAGES IN A MULTICOLOR PHOTOGRAPHIC EMULSION BY EXPOSING THE EMULSION, COLOR DEVELOPING, BLEACHING, FIXING AND WASHING THE SAME, THE IMPROVEMENT WHICH COMPRISING PREVENTING THE FORMATION OF STAIN AFTER THE WASHING OPERATION BY RINSING THE SAID COLORED PHOTOGRAPHIC IMAGE WITH AN AQUEOUS SOLUTION CONTAINING, IN AN ANTI-STAINING AMOUNT, A WATERE-SOLUBLE ADDITION PRODUCT OF FORMALDEHYDE AND A UREA SELECTED FROM THE CLASS CONSISTING OF THOSE HAVING THE FOLLOWING FORMULA:
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) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |