US3868253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the rapid processing of silver dye bleach material
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1973-02-16
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Granted: 1975-02-25
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Expires: 1993-02-16
Abstract
Abstract The present invention relates to a rapid processing method of silver bleach materials. The bath sequence is: (1) silver developing bath, (2) dye bleach bath (3) bleach fixing bath, (4) silver halide fixing bath and (5) soaking bath. Baths (1) and (2) each contain dye bleach catalyst, the material passing from (1) directly into (2). The whole processing is carried out at temperatures of 20* to 50*C. The whole process lasts at most 6 minutes, the dwell time in the individual baths being at most 2 minutes.
Inventors
- 👤 Max Marthaler
- 👤 Ulrich Frauchiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:28
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/28; Y; Y10; Y10S; Y10S430/00; Y10S430/164
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
PROCESS FOR THE RAPID PROCESSING OF SILVER DYE BLEACH MATERIALS WHICH COMPRISES USING THE BATH SEQUENCE (1) SILVER DEVELOPING BATH, (2) DYE BLEACH BATH, (3) BLEACH-FIXING BATH, (4) SILVER HALIDE FIXING BATH AND (5) SOAKING BATH, WITH BOTH THE SILVER DEVELOPING BATH (1) AND THE DYE BLEACH BATH (2) CONTAINING A DYE BLEACH CATALYST AND THE SILVER DYE BLEACH MATERIAL TO BE PROCESSED PASSING FROM A SILVER DEVELOPING BATH (1) DIRECTLY INTO A DYE BLEACH BATH (2), THE ENTIRE PROCESSING, FROM ENTRY INTO THE FIRST BATH (1) TO LEAVING THE LAST BATH (5) LASTING AT MOST 6 MINUTES AT TEMPERATURES OF 20* TO 50*C AND THE DWELL TIME IN THE INDIVIDUAL BATHS AT MOST 2 MINUTES.
Claim 2
Dependent Claim
116 words
PROCESS FOR THE RAPID PROCESSING OF SILVER DYE BLEACH MATERIALS WHICH COMPRISES USING THE BATH SEQUENCE (1) SILVER DEVELOPING BATH, (2) DYE BLEACH BATH, (3) BLEACH-FIXING BATH, (4) SILVER HALIDE FIXING BATH AND (5) SOAKING BATH, WITH BOTH THE SILVER DEVELOPING BATH (1) AND THE DYE BLEACH BATH (2) CONTAINING A DYE BLEACH CATALYST AND THE SILVER DYE BLEACH MATERIAL TO BE PROCESSED PASSING FROM A SILVER DEVELOPING BATH (1) DIRECTLY INTO A DYE BLEACH BATH (2), THE ENTIRE PROCESSING, FROM ENTRY INTO THE FIRST BATH (1) TO LEAVING THE LAST BATH (5) LASTING AT MOST 6 MINUTES AT TEMPERATURES OF 20* TO 50*C AND THE DWELL TIME IN THE INDIVIDUAL BATHS AT MOST 2 MINUTES.
Claim 3
Dependent Claim
41 words
Process according to claim 1, which comprises so chosing the concentration of the dye bleach catalyst in the silver developing bath (1) that the loss in effectiveness caused by the consumption of catalyst in the dye bleach bath (2) is minimised.
Claim 4
Dependent Claim
58 words
Process according to claim 2, which comprises using a bleach-fixing bath (3) with a pH value of at most 4 and containing an oxidising agent which is effective in an acid bath and using a silver halide fixing bath (4) that contains, in addition to a relatively rapidly acting silver salt solvent, more than 20 g/l of sulphite.
Claim 5
Dependent Claim
15 words
Process according to claim 3 which comprises using a nitro compound as an oxidising agent.
Claim 6
Dependent Claim
15 words
Process according to claim 4 which comprises using a nitrobenzenesulphonic acid as a nitro compound.
Claim 7
Dependent Claim
19 words
Process according to claim 3 which comprises using thiourea as the silver salt solvent in the bleach-fixing bath (3).
Claim 8
Dependent Claim
28 words
Process according to claim 1 which comprises dividing at least one of the five baths into a plurality of units which are connected directly one behind the other.
Claim 9
Dependent Claim
13 words
Process according to claim 7 which comprises using several silver developing baths (1).
Claim 10
Dependent Claim
13 words
Process according to claim 7 which comprises using several dye bleach baths (2).
Claim 11
Dependent Claim
12 words
Process according to claim 7 which comprises using several bleach-fixing baths (3).
Claim 12
Dependent Claim
14 words
Process according to claim 7 which comprises using several silver halide fixing baths (4).
Claim 13
Dependent Claim
12 words
Process according to claim 7 which comprises using several soaking baths (5).
Claim 14
Dependent Claim
22 words
Process according to claim 1, characterised in that the dwell times in the individual baths are in the ratio of smaller integers.
References Cited (Backward Citations)
US3156561A
Cited
US3394004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |