US4760015A
Expired / Lapsed
US
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Stabilization of a photographically produced silver image using an amino-1,2,4-triazole
Assignee: Agfa Gevaert AG
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Filing: 1987-04-13
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Granted: 1988-07-26
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Expires: 2007-04-13
Abstract
Abstract Photographically produced black-and-white images (silver images) are stabilized against subsequent destruction of the silver image, in particular against the occurrence of so-called microspot defects, by treatment of the finished silver image with an aqueous after-treatment bath containing an amino-1,2,4-triazole.
Inventors
- 👤 Werner Berthold
- 👤 Gunther Mahlberg
- 👤 Paul Marx
- 👤 Hans hlschlager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:43
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/39; Y; Y10; Y10S; Y10S430/00; Y10S430/166
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
30 words
Process for the stabilization of a photographically produced silver image by treatment of the finished silver image with an after-treatment bath, characterised in that the after-treatment bath contains an amino-1,2,4-triazole.
Claim 2
Dependent Claim
30 words
Process for the stabilization of a photographically produced silver image by treatment of the finished silver image with an after-treatment bath, characterised in that the after-treatment bath contains an amino-1,2,4-triazole.
Claim 3
Dependent Claim
48 words
Process according to claim 1, characterised in that the amino-1,2,4-triazole corresponds to the following formula I: ##STR5## wherein R 1 and R 2 which may be identical or different denote H, NH 2 , alkyl, alkenyl, cycloalkyl, aryl, alkoxy, alkylthio, alkylsulphonyl, sulphamoyl, acyl, SH or a heterocyclic group.
Claim 4
Dependent Claim
83 words
Process according to claim 1, characterised in that the amino-1,2,4-triazole corresponds to one of the following formulae II and III: ##STR6## wherein R 3 and R 4 which may be identical or different denote H, NH 2 , alkyl, aryl or alkylthio; R 5 denotes a group such as R 4 or SH; R 6 denotes H, alkyl, aryl or X--R 7 ; X denotes CO, CS or SO 2 ; and R 7 denotes alkyl, alkenyl, cycloalkyl, aryl or an amino group.
Claim 5
Dependent Claim
28 words
Process according to claims 1, 2 or 3, characterised in that the amino-1,2,4-triazole is contained in an aqueous after-treatment bath in a quantity of 0.5-50 g per liter.
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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |