Patent US3630737A successfully refreshed from Google Patents.
US3630737A
Expired / Lapsed
US
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Photographic stabilizer bath comprising thiocyanate and an inorganic hardener complex
Assignee: Agfa Gevaert AG
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Filing: 1970-04-06
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Granted: 1971-12-28
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Expires: 1990-04-06
Abstract
Abstract Photographic images are produced by imagewise exposure of supported silver halide emulsion layers, development and treatment with a stabilizing bath to convert the light-sensitive silver salt in the unexposed and undeveloped areas into lightinsensitive reaction products. The stabilizing bath contains as inorganic hardeners complex compounds of zirconium, aluminum and chromium.
Inventors
- 👤 Wilhelm Kairies
- 👤 Kurt Faber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/39
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
38 words
The bath of claim 1 wherein the ratio of these metal salts in the mixed complexes of zirconium, aluminum and chromium salts, expressed in terms of the metal oxides, is 100:10 to 20:3 to 8 parts by weight.
Claim 2
Dependent Claim
89 words
In a process for the production of photographic images by exposure of a photographic material containing at least one supported silver halide emulsion layer, development and stabilization in an aqueous stabilizer bath which contains in dissolved form thiocyanates and hardeners, the improvement consisting of treating the developed layer with a stabilizer bath which contains as hardener a mixed complex compound of zirconium, aluminum and chromium salts, the ratio of these metal salts, expressed in terms of the metal oxides ZrO2:Al2O3:Cr2O3, being 100:5 to 50:2 to 30 parts by weight.
Claim 3
Dependent Claim
38 words
The process of claim 3, wherein the ratio of these metal salts in the mixed complexes of zirconium, aluminum and chromium salts expressed in terms of the metal oxides, is 100:10 to 20:3 to 8 parts by weight.
Claim 4
Dependent Claim
28 words
The process of claim 3, wherein the silver halide emulsion layer contains a photographic developer compound and wherein development is performed by treatment with an aqueous alkaline bath.
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |