US4175968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic materials containing anti-fogging agents
Assignee: Agfa Gevaert AG
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Filing: 1978-07-17
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Granted: 1979-11-27
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Expires: 1998-07-17
Abstract
Abstract Undesired color fog obtained on color development of a color photographic material with a primary aromatic amino color developing agent may be reduced when the development is carried out in the presence of an antifogging agent (antistaining agent) of the formula <IMAGE> in which R1 is an acyl group and R2 and R3 are (same or different) hydrogen, alkyl, halogen, sulfo or carboxyl. The antistaining agent is preferable incorporated in non-diffusible form in one or more of the layers of the photographic material.
Inventors
- 👤 Hans-Heinrich Credner
- 👤 Karl-Wilhelm Schranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:57
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/39212; G03C7/39216
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
Light sensitive color photographic material comprising at least one silver halide emulsion layer, containing in at least one of its light sensitive or non-light-sensitive layers a non-diffusing antistaining agent corresponding to the following formula: ##STR4## in which R 1 represents an acyl group rendering the compound resistant to diffusion derived from aliphatic or aromatic carboxylic acids or sulphonic acids, including aliphatic or aromatic carbamic acids or carbonic acid monoesters; R 2 and R 3 which may be the same or different represent hydrogen or substituents selected from the group consisting of alkyl having 1 to 4 carbon atoms, halogen such as chlorine, sulpho, carboxyl.
Claim 2
Dependent Claim
104 words
Light sensitive color photographic material comprising at least one silver halide emulsion layer, containing in at least one of its light sensitive or non-light-sensitive layers a non-diffusing antistaining agent corresponding to the following formula: ##STR4## in which R 1 represents an acyl group rendering the compound resistant to diffusion derived from aliphatic or aromatic carboxylic acids or sulphonic acids, including aliphatic or aromatic carbamic acids or carbonic acid monoesters; R 2 and R 3 which may be the same or different represent hydrogen or substituents selected from the group consisting of alkyl having 1 to 4 carbon atoms, halogen such as chlorine, sulpho, carboxyl.
Claim 3
Dependent Claim
26 words
Material as claimed in claim 1, in which R 1 represents an aliphatic acyl group substituted in the α-, β- or γ-position by an aroxy group.
Claim 4
Dependent Claim
22 words
Material as claimed in claim 2, in which the aliphatic acyl group represented by R 1 is substituted with a phenoxy group.
Claim 5
Dependent Claim
43 words
Material as claimed in claim 1 which contains color couplers incorporated in a diffusion resistant form in a light sensitive silver halide emulsion layer and said non-diffusing antistaining agent is contained in the same color coupler containing layer or an adjacent non-light-sensitive layer.
References Cited (Backward Citations)
US2360290A
Cited
US2403721A
Cited
US2701197A
Cited
US3236652A
Cited
US3770431A
Cited
US3935016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |