US3615439A
Expired / Lapsed
US
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Photographic compositions and processes-b
Assignee: Eastman Kodak Co
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Filing: 1968-10-01
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Granted: 1971-10-26
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Expires: 1988-10-01
Abstract
Abstract Photographic developing agents which are lactone derivatives, such as coumarin derivatives, and especially 6-hydroxy coumarin and/or 6-amino coumarin derivatives, and, which have the property of forming a lactone developing agent precursor under neutral, slightly alkaline and acid conditions, provide less stain without loss of desired sensitometric properties in diffusion transfer systems. These are especially suitable in combination with other photographic developing agents. Corresponding developing agent precursors are also suitable in diffusion transfer systems. Stabilization processing systems can also employ these developing agents and/or developing agent precursors.
Inventors
- 👤 Edwin N Oftedahl Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:47
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
21 words
A photographic product as in claim 1 wherein said cinnamic acid silver halide developing agent is present in the rupturable container.
Claim 2
Dependent Claim
56 words
In a photographic product comprising in combination (a) a photographic element comprising a photographic silver salt layer, (b) a rupturable container containing a processing composition containing a silver halide solvent and (c) an image-receiving layer, the improvement comprising a developing component which is a hydroxy or amino cinnamic acid silver halide developing agent of the formula:
Claim 3
Dependent Claim
31 words
A photographic product as in claim 3 wherein said developing agent is present in said processing composition in a concentration of 0.01 to 10 percent by weight of said processing composition.
Claim 4
Dependent Claim
55 words
In a photographic product comprising in combination (a) a photographic element comprising a photographic silver salt layer, (b) a rupturable container containing a processing composition containing a silver halide solvent and (c) an image-receiving layer, the improvement comprising a developing component which is 2, 5 dihydroxy cinnamic acid or 2-hydroxy-5-amino-cinnamic acid silver halide developing agent.
Claim 5
Dependent Claim
70 words
In a photographic product comprising in combination (a) a photographic element comprising a photographic silver salt layer, (b) a rupturable container containing a processing composition containing a silver halide solvent and (c) an image-receiving layer, the improvement comprising a silver halide developing agent selected from the group consisting of: a. Beta,4-dimethyl-2,5-dihydroxy cinnamic acid, b. Beta-methyl-2,5-dihydroxy-4-methyoxy cinnamic acid, c. Beta,4-diamethyl-2-hydroxy-5-amino cinnamic acid, d. 2-hydroxy-5-amino cinnamic acid, and e. Beta-methyl-4-methoxy-2-hydroxy-5-amino cinnamic acid.
Claim 6
Dependent Claim
146 words
A viscous liquid photographic developer composition comprising (a) a silver halide solvent and (b) a silver halide developing component, wherein said developing component is a hydroxy or amino cinnamic acid silver halide developing agent of the formula: wherein: a. R1 and R2 are individually selected from the group consisting of hydrogen, halogen and alkyl containing one to five carbon atoms; b. R3 and R5 are individually selected from the group consisting of hydrogen, alkyl containing one to five carbon atoms, alkoxy containing one to five carbon atoms, halogen and aryl containing up to 20 carbon atoms; and c. R4 and R6 are individually selected from the group consisting of hydroxy, amino, hydrogen, alkyl containing one to five carbon atoms, alkoxy containing one to five carbon atoms and aryl containing up to 20 Carbon atoms; mixtures thereof, and their salts; at least R4 is amino or hydroxy.
Claim 7
Dependent Claim
38 words
A viscous liquid photographic developer composition comprising (a) a silver halide solvent, (b) a silver halide developing component which comprises -2, 5-dihydroxy cinnamic acid or 2-hydroxy-5-amino cinnamic acid silver halide developing agent and (c) an alkaline development activator.
Claim 8
Dependent Claim
44 words
A viscous liquid photographic developer composition comprising (a) a silver halide solvent, (b) a silver halide developing component which comprises -2,5-dihydroxy cinnamic acid or 2-hydroxy-5-amino cinnamic acid silver halide developing agent and a 1-phenyl-3-pyrazolidone silver halide developing agent and (c) an alkaline development activator.
Claim 9
Dependent Claim
14 words
A viscous liquid photographic developer composition as in claim 9 which is a monobath.
Claim 10
Dependent Claim
146 words
A photographic process which comprises the steps of exposing a photographic element comprising a photographic silver salt layer to form a latent image therein; developing the latent image with a developer composition at a pH of about 12 to about 14 comprising -2,5-dihydroxy cinnamic acid or 2-hydroxy-5-amino cinnamic acid or 6-amino coumarin derivative developing agent; contacting undeveloped silver salts in the photographic silver salt layer with a silver halide solvent to form an imagewise distribution of a silver complex in the unexposed areas of said photographic silver salt layer; transferring at least part of the silver complex to an image receiver layer contiguous to the photographic silver salt layer; reducing the silver complex in the presence of development nuclei to form a visible image on said receiver layer; and lowering the pH of the developer composition to below about 8 to form a stable developed image.
Claim 11
Dependent Claim
22 words
A process as in claim 11 also comprising developing said latent image with a 3-pyrazolidone developing agent or a diaminophenol developing agent.
Claim 12
Dependent Claim
165 words
A photographic process which comprises the steps of exposing a photographic element comprising a photographic silver salt layer to form a latent image therein; developing the latent image with a developer composition at a pH of about 12 to about 14 comprising a photographic silver halide developing agent selected from the group consisting of: a. Beta,4-dimethyl-2,5-dihydroxy cinnamic acid, b. Beta-methyl-2,5-dihydroxy-4-methoxy cinnamic acid, c. Beta,4-dimethyl-2-hydroxy-5-amino cinnamic acid, d. 2-hydroxy-5-amino cinnamic acid, and e. Beta-methyl-4-methoxy-2-hydroxy-5-amino cinnamic acid; contacting undeveloped silver salts in the photographic silver salt layer with a silver halide solvent to form an imagewise distribution of a silver complex in the unexposed areas of said photographic silver salt layer; transferring at least part of the silver complex to an image-receiver layer contiguous to the photographic silver salt layer; reducing the silver complex in the presence of development nuclei to form a visible image on said receiver layer; and lowering the pH of the developer composition to below about 8 to form a stable developed image.
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |