Patent US1129857A successfully refreshed from Google Patents.
US2709136A
Expired / Lapsed
US
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Photographic process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1951-06-04
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Granted: 1955-05-24
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Expires: 1971-06-04
Abstract
No abstract record available.
Inventors
- 👤 Ganguin Karl Otto
- 👤 Macdonald Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:31
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A PROCESS FOR THE PRODUCTION OF COLORED, PHOTOGRAPHIC ELEMENTS FROM PHOTOGRAPHIC MATERIAL COMPRISING OF A BASIC HAVING AT LEAST ONE SILVER HALIDE EMULSION LAYER THEREON AND CONTAINING A COLOR FORMER CAPABLE OF COUPLING WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO DEVELOPING AGENT TO FORM A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF AZOMETHINE AND INDOPHENOLY DYESTUFFS AND A FILTER LAYER CONTAINING A YELLOW, NON-DIFFUSIBLY STYRYL DYESTUFF, SAID STYRYL DYESTUFF BEING OBTAINABLE BY CONDENSATION OF AN ANIL OF A SUBSTITUTED BENZALDEHYDE WITH A REACTIVE METHYLENE COMPOUND, IN LIGHT ABSORBING RELATIONSHIP THEREWITH, SAID PROCESS COMPRISING THE STEPS OF EXPOSING SAID PHOTOGRAPHIC MATERIAL TO LIGHT, COLOR DEVELOPING WITH SAID COLOR FORMING DEVELOPER TO CONVERT SAID COLOR FORMER TO SAID DYESTUFF, BLEACHING AND THEREAFTER DISCHARGING THE STYRYL FILTER DYESTUFF WITHOUT DISCHARGING THE COLOR DEVELOPED DYESTUFF BY TREATING THE EXPOSED AND COLOR DEVELOPED PHOTOGRAPHIC MATERIAL WITH AN AQUEOUS SOLUTION OF AN AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, 4-SULFOPHENYLHYDRAZINE, HYDROXYLAMINE, AND ETHYLENE DIAMINE.
Claim 2
Dependent Claim
162 words
A PROCESS FOR THE PRODUCTION OF COLORED, PHOTOGRAPHIC ELEMENTS FROM PHOTOGRAPHIC MATERIAL COMPRISING OF A BASIC HAVING AT LEAST ONE SILVER HALIDE EMULSION LAYER THEREON AND CONTAINING A COLOR FORMER CAPABLE OF COUPLING WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO DEVELOPING AGENT TO FORM A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF AZOMETHINE AND INDOPHENOLY DYESTUFFS AND A FILTER LAYER CONTAINING A YELLOW, NON-DIFFUSIBLY STYRYL DYESTUFF, SAID STYRYL DYESTUFF BEING OBTAINABLE BY CONDENSATION OF AN ANIL OF A SUBSTITUTED BENZALDEHYDE WITH A REACTIVE METHYLENE COMPOUND, IN LIGHT ABSORBING RELATIONSHIP THEREWITH, SAID PROCESS COMPRISING THE STEPS OF EXPOSING SAID PHOTOGRAPHIC MATERIAL TO LIGHT, COLOR DEVELOPING WITH SAID COLOR FORMING DEVELOPER TO CONVERT SAID COLOR FORMER TO SAID DYESTUFF, BLEACHING AND THEREAFTER DISCHARGING THE STYRYL FILTER DYESTUFF WITHOUT DISCHARGING THE COLOR DEVELOPED DYESTUFF BY TREATING THE EXPOSED AND COLOR DEVELOPED PHOTOGRAPHIC MATERIAL WITH AN AQUEOUS SOLUTION OF AN AMINO COMPOUND SELECTED FROM THE GROUP CONSISTING OF HYDRAZINE, 4-SULFOPHENYLHYDRAZINE, HYDROXYLAMINE, AND ETHYLENE DIAMINE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |