US3957516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation for the processing of photographic materials
Assignee: Ilford Imaging Switzerland GmbH
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Filing: 1974-05-10
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Granted: 1976-05-18
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Expires: 1994-05-10
Abstract
Abstract The present invention relates to an oil-in-water emulsion which is suitable for processing photographic material. There is present or produced during the processing a substance which exerts its action on the photographic material from the aqueous phase. Contingent on the consumption the active substance is replenished or regenerated from the oily phase. The active substance is more readily soluble in the oily phase than in the aqueous one. The active substance may be, e.g., a dye bleach catalyst for silver dye bleach material or an alkylmercaptan, the latter acting as an antioxidant.
Inventors
- 👤 Matthias Schellenberg
- 👤 Christoph Chylewski
- 👤 Max Meier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:42
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/44; G03C5/261; G03C5/29; G03C5/31; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
52 words
Liquid preparation suitable for the processing of photographic silver dye bleach material, which preparation substantially consists of an oil-in-water emulsion which comprises as an acitve substance, capable of exerting its action on the photographic material, a lipophilic dye bleach catalyst more readily soluble in the oily phase than in the aqueous one.
Claim 2
Dependent Claim
52 words
Liquid preparation suitable for the processing of photographic silver dye bleach material, which preparation substantially consists of an oil-in-water emulsion which comprises as an acitve substance, capable of exerting its action on the photographic material, a lipophilic dye bleach catalyst more readily soluble in the oily phase than in the aqueous one.
Claim 3
Dependent Claim
17 words
Liquid preparation as claimed in claim 1 which contains a dye bleach catalyst of the formula ##SPC3##
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |