US4095983A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic material comprising cyclic sulfonamide substituted yellow color couplers
Assignee: Agfa Gevaert AG
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Filing: 1976-12-07
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Granted: 1978-06-20
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Expires: 1996-12-07
Abstract
Abstract α-Acylacetanilide yellow-forming couplers having a cyclic 5- or 6-membered sulfonamide group attached through its nitrogen atom to the phenyl group of the anilide portion of the molecule provide dyes of better light stability. The couplers include both 2-equivalent and 4-equivalent couplers.
Inventors
- 👤 Erich Wolff
- 👤 Dieter Lowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/362; C; C07; C07D; C07D279/00; C07D279/02; G03C7/305; G03C7/30511; G03C7/30517; G03C7/30535
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
Colour photographic material comprising at least one light-sensitive silver halide emuslion layer and containing in said silver halide emulsion layer or a layer adjacent thereto, a benzoyl or alkoyl acetanilide yellow-forming coupler, characterised in that the anilide ring has directly substituted on it the nitrogen of a cyclic alkylene sulphonamide group in which the cycle has 5 or 6 members.
Claim 2
Dependent Claim
60 words
Colour photographic material comprising at least one light-sensitive silver halide emuslion layer and containing in said silver halide emulsion layer or a layer adjacent thereto, a benzoyl or alkoyl acetanilide yellow-forming coupler, characterised in that the anilide ring has directly substituted on it the nitrogen of a cyclic alkylene sulphonamide group in which the cycle has 5 or 6 members.
Claim 3
Dependent Claim
73 words
Material as claimed in claim 1, in which the yellow-forming coupler is a compound corresponding to the following formula in which R 1 represents an aliphatic or aromatic group; X represents hydrogen or a group which can be split off during colour development and R 2 and R 3 which may be the same or different and represent each a substituent selected from the group consisting of hydrogen, alkoxy, aroxy, alkyl or halogen.
Claim 4
Dependent Claim
18 words
Material as claimed in claim 2, in which R 1 represents a phenyl group or a t-butyl group.
Claim 5
Dependent Claim
51 words
Material as claimed in claim 2, in which R 1 represents phenyl substituted with an alkoxy group having up to 18 carbon atoms or t-butyl and R 2 and R 3 represent each a substituent selected from the group consisting of hydrogen, chlorine or alkoxy having up to 6 carbon atoms.
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |