US4018609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic multilayered material with layers of acid ashed gelatine
Assignee: Agfa Gevaert AG
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Filing: 1975-05-27
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Granted: 1977-04-19
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Expires: 1995-05-27
Abstract
Abstract In a color photographic multilayered material which is suitable for rapid processing the protective layer and the auxiliary layers contain pigskin gelatine ashed under acid condition.
Inventors
- 👤 Karl Lohmer
- 👤 Hermann Seiz
- 👤 Karl Zietan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; Y; Y10; Y10S; Y10S430/00; Y10S430/151
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
The light sensitive multi-layer photographic material having in combination sensitized layers comprising a red sensitive silver halide gelatine emulsion layer which contains alkaline-treated gelatine and a cyan coupler, a green sensitive silver halide gelatine emulsion layer which contains alkaline-treated gelatine and a magenta coupler and a blue sensitive silver halide gelatine emulsion layer containing alkaline-treated gelatine and a yellow coupler, and at least one intermediate light insensitive layer positioned between said sensitized layers and containing a gelatine binder, and protective covering layer overlying said sensitized layers containing a gelatine binder, wherein the improvement comprises the gelatine binder of said intermediate and protective covering layer consists essentially of inert acid-ashed gelatine having an isoelectric point of between 6.5 and 9.5.
Claim 2
Dependent Claim
119 words
The light sensitive multi-layer photographic material having in combination sensitized layers comprising a red sensitive silver halide gelatine emulsion layer which contains alkaline-treated gelatine and a cyan coupler, a green sensitive silver halide gelatine emulsion layer which contains alkaline-treated gelatine and a magenta coupler and a blue sensitive silver halide gelatine emulsion layer containing alkaline-treated gelatine and a yellow coupler, and at least one intermediate light insensitive layer positioned between said sensitized layers and containing a gelatine binder, and protective covering layer overlying said sensitized layers containing a gelatine binder, wherein the improvement comprises the gelatine binder of said intermediate and protective covering layer consists essentially of inert acid-ashed gelatine having an isoelectric point of between 6.5 and 9.5.
Claim 3
Dependent Claim
31 words
Light-sensitive colour photographic material according to claim 1, characterised in that it contains an acid ashed gelatine which has been purified either by oxidation to render it inert or by desalting.
Claim 4
Dependent Claim
35 words
The light sensitive multi-layer photographic material as claimed in claim 1 wherein the acid-ashed gelatine has a viscosity in 10% aqueous solution of between 15 and 35 cp and a gel solidity above 170 Bloom.
References Cited (Backward Citations)
US3551151A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |