US2579436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of inhibiting the degradation of photographic color images
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
2026-10-29 12:54
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046; G03C7/3003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
IN THE PROCESS OF PRODUCING COLOR PHOTOGRAPHIC IMAGES IN A MULTICOLOR PHOTOGRAPHIC EMULSION BY EXPOSING THE EMULSION, COLOR DEVELOPING, BLEACHING, FIXING AND WASHING THE SAME, THE IMPROVEMENT WHICH COMPRISES PREVENTING THE FORMATION OF STAIN AFTER THE WASHING OPERATION BY RINSING THE SAID COLORED PICTURE WITH AN AQUEOUS SOLUTION CONTAINING,IN AN ANTI-STAINING AMOUNT, A HYDANTOIN COMPOUND SELECTED FROM THE CLASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
67 words
IN THE PROCESS OF PRODUCING COLOR PHOTOGRAPHIC IMAGES IN A MULTICOLOR PHOTOGRAPHIC EMULSION BY EXPOSING THE EMULSION, COLOR DEVELOPING, BLEACHING, FIXING AND WASHING THE SAME, THE IMPROVEMENT WHICH COMPRISES PREVENTING THE FORMATION OF STAIN AFTER THE WASHING OPERATION BY RINSING THE SAID COLORED PICTURE WITH AN AQUEOUS SOLUTION CONTAINING,IN AN ANTI-STAINING AMOUNT, A HYDANTOIN COMPOUND SELECTED FROM THE CLASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
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 |