US3869288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of developing color film
Assignee: Individual
•
Filing: 1973-07-25
•
Granted: 1975-03-04
•
Expires: 1993-07-25
Abstract
Abstract Exposed color film is developed by first impregnating all color layers of the film emulsion with an inactively acidic developer solution so as to distribute the developer uniformly throughout, by removing excess developer solution from the surface of the film, and by then diffusing a strongly alkaline solution throughout the developer-impregnated emulsion layers so as to activate the developer in all layers without significantly altering the concentration of the developer in any layer.
Inventors
- 👤 Leopold S Godowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:21
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
THE METHOD FOR DEVELOPING EXPOSED COLOR FILM HAVING A PHOTOGRAPHIC EMULSION COMPRISING A PLURALITY OF LAYERS EACH CONTAINING A SILVER HALIDE AND A DIFFERENT COLOR COUPLER WHICH COMPRISES SUBJECTING THE EXPOSED FILM EMULSION TO CONTACT WITH AN INACTIVELY-ACIDIC AQUEOUS COLOR DEVELOPER SOLUTION FOR A SUFFICIENT PERIOD OF TIME FOR THE DEVELOPER SOLUTION TO PERVADE THE EMULSION AND THUS ESTABLISH A UNIFORM CONCENTRATION OF THE DEVELOPER IN AND THROUGH EACH OF SAID LAYERS, AND IMMEDIATELY THEREAFTER EFFECTING PERMEATION OF THE THUSTREATED EMULSION WITH A SPRAY OF SMALL DROPLETS OF A STRONGLY ALKALINE AQUEOUS SOLUTION SUBSTANTIALLY EXCLUSIVELY BY DIFFUSION FREE FROM AGITATION INTO SAID EMULSION LAYERS AND THUS RENDERING SUBSTANTIALLY THE ENTIRE CONTENT OF SAID DEVELOPER IN EACH LAYER REACTIVE WITH RESPECTIVE TO THE EXPOSED SILVER SALT AND COUPLER THEREIN.
Claim 2
Independent Claim
128 words
THE METHOD FOR DEVELOPING EXPOSED COLOR FILM HAVING A PHOTOGRAPHIC EMULSION COMPRISING A PLURALITY OF LAYERS EACH CONTAINING A SILVER HALIDE AND A DIFFERENT COLOR COUPLER WHICH COMPRISES SUBJECTING THE EXPOSED FILM EMULSION TO CONTACT WITH AN INACTIVELY-ACIDIC AQUEOUS COLOR DEVELOPER SOLUTION FOR A SUFFICIENT PERIOD OF TIME FOR THE DEVELOPER SOLUTION TO PERVADE THE EMULSION AND THUS ESTABLISH A UNIFORM CONCENTRATION OF THE DEVELOPER IN AND THROUGH EACH OF SAID LAYERS, AND IMMEDIATELY THEREAFTER EFFECTING PERMEATION OF THE THUSTREATED EMULSION WITH A SPRAY OF SMALL DROPLETS OF A STRONGLY ALKALINE AQUEOUS SOLUTION SUBSTANTIALLY EXCLUSIVELY BY DIFFUSION FREE FROM AGITATION INTO SAID EMULSION LAYERS AND THUS RENDERING SUBSTANTIALLY THE ENTIRE CONTENT OF SAID DEVELOPER IN EACH LAYER REACTIVE WITH RESPECTIVE TO THE EXPOSED SILVER SALT AND COUPLER THEREIN.
Claim 3
Dependent Claim
19 words
The method according to claim 1 in which the alkaline aqueous solution has a pH of at least 10.3.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the developer is so acidic that it remains inactive.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein the material which activates the developer is alkaline to cause the couplers to react in the emulsion.
Claim 6
Dependent Claim
16 words
The method of claim 4 wherein the developer in the emulsion developes the emulsion by diffusion.
Claim 7
Dependent Claim
13 words
The method of claim 5 wherein the developer has a pH below developability.
Claim 8
Dependent Claim
19 words
The method of claim 5 wherein the activating means has a pH sufficient to cause the couplers to react.
Claim 9
Dependent Claim
21 words
The method of claim 5 wherein the emulsion comprises three layers each containing a silver halide and a different color coupler.
References Cited (Backward Citations)
US2238495A
Cited
US2920960A
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US2860977A
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US3246988A
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US3342597A
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US3425832A
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US3759712A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |