Patent US4925778A successfully refreshed from Google Patents.
US4925778A
Expired / Lapsed
US
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Process for the rapid development of color materials
Assignee: Agfa Gevaert AG
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Filing: 1989-03-10
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Granted: 1990-05-15
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Expires: 2009-03-10
Abstract
Abstract A process for the rapid development of imagewise exposed silver halide recording materials which contain on a layer support at least three light sensitive silver halide emulsion layers of different spectral sensitivity, with which a cyan coupler, a magenta coupler and a yellow coupler are in each case spectrally associated, comprising the following treatment steps: 1. treatment of the photographic material with a solution I of a color developing agent or a salt thereof at pH 1 to 8 over a period of 1 to 10 seconds, 2. treatment of the photographic material impregnated with the developing agent with an alkali-containing solution II at pH 10 to 14 over a period of 1 to 10 seconds. produces maximum color densities of the kind otherwise only obtained by conventional development over a period of 45 seconds.
Inventors
- 👤 Ubbo Wernicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:48
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/407; Y; Y10; Y10S; Y10S430/00; Y10S430/164
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
Process for the rapid development of imagewise exposed silver halide recording materials which contain on a layer support at least three light-sensitive silver halide emulsion layers of different spectral sensitivity, with which a cyan coupler, a magenta coupler and a yellow coupler are in each case spectrally associated, comprising the following treatment steps: 1. treatment of the photographic material with a solution I of a color developing agent or a salt thereof at pH 1 to 8 over a period of 1 to 10 seconds, 2. treatment of the photographic material impregnated with the developing agent with a alkali-containing solution II at pH 10 to 14 over a period of 1 to 10 seconds.
Claim 2
Dependent Claim
114 words
Process for the rapid development of imagewise exposed silver halide recording materials which contain on a layer support at least three light-sensitive silver halide emulsion layers of different spectral sensitivity, with which a cyan coupler, a magenta coupler and a yellow coupler are in each case spectrally associated, comprising the following treatment steps: 1. treatment of the photographic material with a solution I of a color developing agent or a salt thereof at pH 1 to 8 over a period of 1 to 10 seconds, 2. treatment of the photographic material impregnated with the developing agent with a alkali-containing solution II at pH 10 to 14 over a period of 1 to 10 seconds.
Claim 3
Dependent Claim
26 words
Process according to claim 1, wherein the silver halide emulsion layers of the photographic recording material to be developed contain at least 80 mol% of chloride.
Claim 4
Dependent Claim
25 words
Process according to claim 1, wherein the silver halide emulsion layers of the photographic material to be developed contain at least 95 mol% of chloride.
Claim 5
Dependent Claim
16 words
Process according to claim 1, wherein the development is completed in a maximum of 20 seconds.
Claim 6
Dependent Claim
16 words
Process according to claim 1, wherein the development is completed in a maximum of 10 seconds.
Claim 7
Dependent Claim
14 words
Process according to claim 1, wherin the developer solution 1 contains no benzyl alcohol.
Claim 8
Dependent Claim
24 words
Process according to claim 1, wherein the development in both development baths takes place at temperatures in the range of 20° to 40° C.
Claim 9
Dependent Claim
20 words
Process according to claim 1, wherein the developing agent is applied in an amount of from 5 to 100 g/l.
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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |