Patent US4198239A successfully refreshed from Google Patents.
US4198239A
Expired / Lapsed
US
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Color photographic materials containing an antistain agent
Assignee: Agfa Gevaert AG
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Filing: 1977-08-31
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Granted: 1980-04-15
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Expires: 1997-08-31
Abstract
Abstract An improvement in the prevention color-fog and staining in color-photographic materials is obtained by the inclusion of acylamino substituted hydroquinones derivatives. The compounds can easily be synthesized do not crystalize from their dispersions and are not oxidized to colored by-products during development.
Inventors
- 👤 Hans-Heinrich Credner
- 👤 Rigobert Otto
- 👤 Karl-Wilhelm Schranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:02
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/39212; G03C7/39216
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
60 words
Light-sensitive color photographic material containing at least one silver halide emulsion layer, characterized by containing an antistain agent of the following formula ##STR3## in which R 1 and R 2 represent hydrogen, alkyl with up to 3 carbon atoms, halogen, sulpho or carboxyl and R 3 represents an acetyl group substituted with a phenoxy group which may itself be substituted.
Claim 2
Dependent Claim
60 words
Light-sensitive color photographic material containing at least one silver halide emulsion layer, characterized by containing an antistain agent of the following formula ##STR3## in which R 1 and R 2 represent hydrogen, alkyl with up to 3 carbon atoms, halogen, sulpho or carboxyl and R 3 represents an acetyl group substituted with a phenoxy group which may itself be substituted.
Claim 3
Dependent Claim
37 words
Material according to claim 1, characterised in that colour couplers are incorporated in a diffusion resistant form in the light-sensitive silver halide emulsion layer and the antistain agents are contained in this layer or an adjacent layer.
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) | 1983-04-15 | 1983-10-15 | 1984-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-15 | 1987-10-15 | 1988-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-15 | 1991-10-15 | 1992-04-15 | $7700.00 | Window Closed / Lapsed |