Patent US4451555A successfully refreshed from Google Patents.
US4451555A
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Antifogging compounds and their use in silver halide photography
Assignee: AGF A-GEVAERT
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Filing: 1981-11-25
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Granted: 1984-05-29
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Expires: 2001-11-25
Abstract
Abstract The present invention deals with novel antifogging compounds and their use in a method of photographic reproduction comprising developing a photographic material having at least one exposed silver halide emulsion layer in the presence of a 1-phenyl-5-mercaptotetrazole compound wherein the phenyl group bears a substituent comprising at least one thioether function.
Inventors
- 👤 Robert J. Pollet
- 👤 Antoon L. Vandenberghe
- 👤 Roger A. Spriet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:52
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
A photographic material comprising one or more hydrophilic colloid layers including at least one silver halide emulsion layer, at least one of said layers containing in an amount sufficient to inhibit fog a 1-phenyl-5-mercaptotetrazole compound or a precursor thereof, wherein the phenyl group bears a substituent comprising at least one thioether function.
Claim 2
Dependent Claim
52 words
A photographic material comprising one or more hydrophilic colloid layers including at least one silver halide emulsion layer, at least one of said layers containing in an amount sufficient to inhibit fog a 1-phenyl-5-mercaptotetrazole compound or a precursor thereof, wherein the phenyl group bears a substituent comprising at least one thioether function.
Claim 3
Dependent Claim
60 words
A photographic material according to claim 1, wherein the said 1-phenyl-5-mercaptotetrazole compound corresponds to the general formula: ##STR10## wherein: Q represents H or lower alkyl having from 1 to 4 carbon atoms; R represents --A--S--Z, --CO--A--S--Z or --SO 2 --A--S--Z; A represents a straight- or branched-chain alkylene group of 1 to 4 carbon atoms, and Z represents an alkyl group.
Claim 4
Dependent Claim
32 words
A photographic material according to claim 1, wherein the said 1-phenyl-5-mercaptotetrazole compound or a precursor thereof, is present in a concentration of from 0.01 to 5 mmol per mol of silver halide.
Claim 5
Dependent Claim
24 words
A photographic material according to claim 1, comprising furthermore one or more compounds selected from the group consisting of 5-methyl-7-hydroxy-1,3,4-triazaindolizine, 1-phenyl-5-mercaptotetrazole and 2,3-dimethylbenzothiazolium p-tolusulphonate.
Claim 6
Dependent Claim
47 words
A photographic developer composition for use in silver halide photography comprising a silver halide developing agent and between 1 and 250 mg per liter of a 1-phenyl-5-mercaptotetrazole fog inhibiting compound or a precursor thereof, wherein the phenyl group bears a substituent comprising at least one thioether function.
Claim 7
Dependent Claim
47 words
A photographic developer composition for use in silver halide photography comprising a silver halide developing agent and between 1 and 250 mg per liter of a 1-phenyl-5-mercaptotetrazole fog inhibiting compound or a precursor thereof, wherein the phenyl group bears a substituent comprising at least one thioether function.
Claim 8
Dependent Claim
63 words
A photographic developer composition according to claim 5, wherein the said 1-phenyl-5-mercaptotetrazole fog inhibiting compound corresponds to the general formula: ##STR11## wherein: Q represents H or lower alkyl having from 1 to 4 carbon atoms; R represents --A--S--Z, --CO--A--S--Z or --SO 2 --A--S--Z; A represents a straight- or branched-chain alkylene group of 1 to 4 carbon atoms, and Z represents an alkyl group.
Claim 9
Independent Claim
51 words
A method of photographic reproduction comprising developing a silver halide photographic material having at least one exposed silver halide emulsion layer having present therein in an amount sufficient to inhibit fog a 1-phenyl-5-mercaptotetrazole compound or a precursor thereof, wherein the phenyl group bears a substituent comprising at least one thioether function.
Claim 10
Independent Claim
51 words
A method of photographic reproduction comprising developing a silver halide photographic material having at least one exposed silver halide emulsion layer having present therein in an amount sufficient to inhibit fog a 1-phenyl-5-mercaptotetrazole compound or a precursor thereof, wherein the phenyl group bears a substituent comprising at least one thioether function.
Claim 11
Dependent Claim
59 words
A method according to claim 7, wherein the said 1-phenyl-5-mercaptotetrazole compound corresponds to the general formula: ##STR12## wherein: Q represents H or lower alkyl having from 1 to 4 carbon atoms; R represents --A--S--Z, --CO--A--S--Z or --SO 2 --A--S--Z; A represents a straight- or branched-chain alkylene group of 1 to 4 carbon atoms, and Z represents an alkyl group.
References Cited (Backward Citations)
US3397987A
Cited
US3708303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |