US2627461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indophenazines as catalysts in dye bleach baths for color photography
Assignee: GAF Chemicals Corp
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Filing: 1950-07-22
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Granted: 1953-02-03
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Expires: 1970-07-22
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Friedman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:25
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A DYE BLEACH BATH FOR PRODUCING A COLORED IMAGE IN A PHOTGRAPHIC EMULSION LAYRE CONTAINING A BLEACHABLE AZO DYE AND SILVER IMAGE COMPRISING AN AQUEOUS SOLUTION OF AN ALKALI HALIDE SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL AND AMMONIUM BROMIDES, CHLORIDE, AND IODIDES, AND AN ACID SELECTED FROM THE CLASS CONSISTING OF MINERAL AND WATER-SOLUBLE ORGANIC ACIDS AND AN ACCELERATING AMOUNT OF AN INDOPHENAZINE SELECTED FROM THE CLASS CONSISTING OF THOSE OF THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
76 words
A DYE BLEACH BATH FOR PRODUCING A COLORED IMAGE IN A PHOTGRAPHIC EMULSION LAYRE CONTAINING A BLEACHABLE AZO DYE AND SILVER IMAGE COMPRISING AN AQUEOUS SOLUTION OF AN ALKALI HALIDE SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL AND AMMONIUM BROMIDES, CHLORIDE, AND IODIDES, AND AN ACID SELECTED FROM THE CLASS CONSISTING OF MINERAL AND WATER-SOLUBLE ORGANIC ACIDS AND AN ACCELERATING AMOUNT OF AN INDOPHENAZINE SELECTED FROM THE CLASS CONSISTING OF THOSE OF 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) | 1956-02-03 | 1956-08-04 | 1957-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-03 | 1960-08-04 | 1961-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-03 | 1964-08-04 | 1965-02-03 | $7700.00 | Window Closed / Lapsed |