US2518686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aldehyde antistain baths for developed color photographic material
Assignee: GAF Chemicals Corp
•
Filing: 1945-11-08
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Granted: 1950-08-15
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Expires: 1965-11-08
Abstract
No abstract record available.
Inventors
- 👤 Harold C Harsh
- 👤 James E Bates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:34
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
IN A PROCESS OF PRODUCING COLOR PHOTOGRAPHIC IMAGES SELECTED FROM THE CLASS CONSISTING OF INDOPHENOL AND AZOMETHINE DYES IN A MULTILAYER COLOR FILM BY EXPOSING THE FILM, COLOR-FORMING DEVELOPING THE SAME, BLEACHING, FIXING AND WASHING, THE IMPROVEMENT WHICH COMPRISES AVOIDING THE FORMATION OF STAIN, AFTER THE BLEACHING, FIXING, AND WASHING OPERATION, BY RINSING THE SAID FILM WITH AN AQUEOUS SOLUTION CONSISTING OF WATER AND A CARBONYL COMPOUND SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC ALDEHYDES AND DI-KETONES.
Claim 2
Dependent Claim
77 words
IN A PROCESS OF PRODUCING COLOR PHOTOGRAPHIC IMAGES SELECTED FROM THE CLASS CONSISTING OF INDOPHENOL AND AZOMETHINE DYES IN A MULTILAYER COLOR FILM BY EXPOSING THE FILM, COLOR-FORMING DEVELOPING THE SAME, BLEACHING, FIXING AND WASHING, THE IMPROVEMENT WHICH COMPRISES AVOIDING THE FORMATION OF STAIN, AFTER THE BLEACHING, FIXING, AND WASHING OPERATION, BY RINSING THE SAID FILM WITH AN AQUEOUS SOLUTION CONSISTING OF WATER AND A CARBONYL COMPOUND SELECTED FROM THE CLASS CONSISTING OF ALIPHATIC ALDEHYDES AND DI-KETONES.
References Cited (Backward Citations)
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US2134266A
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US2150757A
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US2323481A
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US2378265A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |