US4171223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive color photographic material
Assignee: Agfa Gevaert AG
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Filing: 1978-06-23
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Granted: 1979-10-16
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Expires: 1998-06-23
Abstract
Abstract Non-diffusible silver halide development inhibitor releasing thioether compounds in which a color development does not give rise to a substantial formation of permanent dyes are 1,2,5'-Δ 2 -thiadiazoline-1,1-dioxide derivatives of the following formula or its tautomeric (Δ 3 ) form: ##STR1## in which X represents an aliphatic, aromatic or heterocyclic group such that when it is split off together with the sulphur atom of the thioether bridge, it forms a diffusible mercapto compound capable of inhibiting the development of the silver halide; R 1 represents hydrogen, alkyl, aryl or a heterocyclic group and R 2 represents hydrogen, alkyl, aryl, a heterocyclic group or preferably acyl.
Inventors
- 👤 Heinrich Odenwalder
- 👤 Walter Puschel
- 👤 Erwin Ranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:19
CPC Classifications
C; C07; C07D; C07D285/00; C07D285/01; C07D285/02; C07D285/04; C07D285/10; G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30511; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
A color photographic material comprising in at least one silver halide emulsion layer or in a light insensitive layer of binder associated therewith, a non-diffusible thioether compound capable of reacting with the oxidation products of a primary aromatic amino color developer substance to release a diffusible silver halide development inhibitor compound, wherein the improvement comprises the non-diffusible thioether compound is a 1,2,5-Δ 2 -thiadiazoline-1,1-dioxide which carries in its 4-position a thioether group of the formula --S--X wherein X represents a heterocyclic group which, when split off together with the sulfur atom of the thioether group, forms a diffusible mercapto compound capable of inhibiting the development of the silver halide.
Claim 2
Dependent Claim
109 words
A color photographic material comprising in at least one silver halide emulsion layer or in a light insensitive layer of binder associated therewith, a non-diffusible thioether compound capable of reacting with the oxidation products of a primary aromatic amino color developer substance to release a diffusible silver halide development inhibitor compound, wherein the improvement comprises the non-diffusible thioether compound is a 1,2,5-Δ 2 -thiadiazoline-1,1-dioxide which carries in its 4-position a thioether group of the formula --S--X wherein X represents a heterocyclic group which, when split off together with the sulfur atom of the thioether group, forms a diffusible mercapto compound capable of inhibiting the development of the silver halide.
Claim 3
Dependent Claim
99 words
A color photographic material as claimed in claim 1, in which the non-diffusible thioether compound corresponds to the following formula I or the corresponding tautomeric form: ##STR15## in which X represents a heterocyclic group which, when split off together with the sulfur atom of the thioether group forms a diffusible mercapto compound capable of inhibiting the development of the silver halide; R 1 represents hydrogen, alkyl, aryl or a heterocyclic group; R 2 represents an acyl group selected from those derived from an aliphatic or aromatic carboxylic acid, a carbonic acid monoester or a N-alkyl- or N-aryl-substituted carbamic acid.
References Cited (Backward Citations)
US3620745A
Cited
US3841880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |