Patent US3615511A successfully refreshed from Google Patents.
US3615511A
Expired / Lapsed
US
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Surface developer with heterocyclic mercaptan for use on internal image emulsion
Assignee: Eastman Kodak Co
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Filing: 1968-05-22
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Granted: 1971-10-26
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Expires: 1988-05-22
Abstract
Abstract Processes and compositions for developing or stabilizing image records in photographic, internal image, silver halide compositions. In one aspect, the developing or stabilizing compositions of this invention contain low concentrations of a silver complexing agent. In another aspect, photographic compositions are stabilized or developed with a process comprising a bleach bath followed by a surface type developer. In a preferred embodiment direct-print materials containing either photodeveloped images or nonphotodeveloped latent images can be processed to provide permanent image records.
Inventors
- 👤 Roger M Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/49; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/305
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
20 words
A process according to claim 1 wherein said groups capable of forming covalent bonds with silver consist of mercaptan groups.
Claim 2
Dependent Claim
13 words
A process according to claim 2 wherein said silver complexing agent is 2-mercaptoimidazole.
Claim 3
Dependent Claim
43 words
A process according to claim 1 wherein said silver complexing agent is selected from the group consisting of 2-mercaptothiazole, 2-mercapto benzothiazole, 2-mercapto-6-nitrobenzothiazole, 4-carboxymethyl-4-thiazoline-2-thione, thiazolidine-2-thione, imidazole, 2-benzimidazolethiol, 5-amino-2-benzimidazolethiol, 2-mercaptoimidazole, 1-methyl-2-mercaptoimidazole, 2-mercaptopyrimidine, dithiourazole, o-aminobenzenethiol, o-mercaptobenzoic acid, 1-phenyl-2-mercaptotetrazole, 1-phenyl-2-thiourea, 5-nitrobenzimidazolethiol, 6-amino-2-mercaptobenzothiozole, 2-benzoxazolethiol, 5-methyl-2-oxazolidinethione, 4-Aminophenyl-disulfide and 1-allyl-2-thiourea.
Claim 4
Dependent Claim
23 words
A process according to claim 4 wherein said silver complexing agent is selected for the group consisting of 1-allyl-2-thiourea, 2-mercaptoimidazole, dithiourazole, and 1-phenyl-5mercaptotetrazole.
Claim 5
Dependent Claim
29 words
A process according to claim 4 wherein said silver complexing agent is 2-mercaptoimidazole, in a concentration of from 1 X 10 4 to about 1.5 X 10 3 moles/liter.
Claim 6
Dependent Claim
116 words
A process for stabilizing image records in light developable internal image silver halide compositions which have been imagewise exposed and photodeveloped to produce a visible image therein, said process comprising (1) contacting said silver halide composition with a silver halide bleaching solution, and then (2) contacting said silver halide with a surface developing solution comprising a developing agent and from about 10 5 to about 4 X 10 3 moles/liter of a silver complexing agent comprising at least one group capable of forming covalent bonds with silver, said groups selected from mercaptan groups, imide groups, or tautomers thereof and at least one secondary bonding group capable of forming pi-bonds, said secondary bonding group consisting of groups.
Claim 7
Dependent Claim
44 words
A process according to claim 7 wherein said silver complexing agent is selected from a group consisting of 2-mercaptothiazole, 2-mercapto benzothiazole, 2-mercapto-6-nitrobenzthiazole, 4-carboxymethyl-4-thiazoline-2-thione, thiazolidine-2-thione, imidazole, 2-benzimidazolethiol, 5-amino-2benzimidasolethiol, 2-mercaptoimidazole, 1-methyl-2-mercaptoimidazole, 2-mercaptopyrimidine, dithiourazole, o-aminobenzenethiol, o-mercaptobenzoic acid, 1-phenyl-2-mercaptotetrazole, 1-phenyl-2-thiourea, 5-nitrobenzimidazolethiol, 6-amino-2-mercaptobenzothiozole, 2-benzoxazolethiol, 5-methyl-2-oxazolidinethione, 4-aminophenyl-disulfide and 1-allyl- 2-thiourea.
Claim 8
Dependent Claim
23 words
A process according to claim 7 wherein said silver complexing agent is selected from the group consisting of 1-allyl-2thiourea, 2mercaptoimidazole, dithiourazole, and 1-phenyl-5-mercaptotetrazole.
Claim 9
Dependent Claim
20 words
A process according to claim 7 wherein said bleaching solution comprises potassium dichromate, and said silver complexing agent comprises 2-mercaptoimidazole.
Claim 10
Dependent Claim
20 words
A process according to claim 7 wherein said groups capable of forming covalent bonds with silver consists of mercaptan groups.
Claim 11
Dependent Claim
13 words
A process according to claim 7 wherein said silver complexing agent is 2-mercaptoimidazole.
Claim 12
Dependent Claim
71 words
A process according to claim 7 wherein said silver complexing agent is compound which is soluble in water in a concentration of at least 10 5 moles/liter at 70* F. and wherein said compound is capable of forming a silver complex having a ratio of at least 1 silver ion to 1 silver complexing agent in a molar basis in the presence of excess silver ions as measured by potentiometric titration.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |