Patent US4021244A successfully refreshed from Google Patents.
US4021244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic materials with surface layers comprising both alkali and acid produced gelatin
Assignee: Fujifilm Holdings Corp
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Filing: 1975-04-17
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Granted: 1977-05-03
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Expires: 1995-04-17
Abstract
Abstract Silver halide photographic sensitive materials which comprise a surface layer containing acid treated gelatin and alkali treated gelatin, wherein the ratio by weight of the alkali treated gelatin to the acid treated gelatin is about 0.5 to less than about 100%.
Inventors
- 👤 Shigeru Nagatomo
- 👤 Kiyotaka Hori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:23
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047; G03C1/76; G03C1/7614; G03C2001/0471; Y; Y10; Y10S; Y10S430/00; Y10S430/1053; Y10S430/1055; Y10S430/106; Y10S430/151
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
137 words
A silver halide photographic sensitive material comprising a support and at least one light-sensitive silver halide emulsion layer and with a surface layer located on the same side of the support as the light-sensitive silver halide emulsion layers and containing gelatin produced by processing collagen in acid and gelatin produced by processing collagen in alkali, in a ratio by weight of the gelatin produced by processing collagen in alkali to the gelatin produced by processing collagen in acid of about 0.5% or more but less than 100%, the total of the gelatin produced by processing collagen in acid and the gelatin produced by processing collagen in alkali in said surface layer being greater than about 20% by weight of the total weight of the binder in the surface layer, said surface layer not being a light-sensitive layer.
Claim 2
Dependent Claim
137 words
A silver halide photographic sensitive material comprising a support and at least one light-sensitive silver halide emulsion layer and with a surface layer located on the same side of the support as the light-sensitive silver halide emulsion layers and containing gelatin produced by processing collagen in acid and gelatin produced by processing collagen in alkali, in a ratio by weight of the gelatin produced by processing collagen in alkali to the gelatin produced by processing collagen in acid of about 0.5% or more but less than 100%, the total of the gelatin produced by processing collagen in acid and the gelatin produced by processing collagen in alkali in said surface layer being greater than about 20% by weight of the total weight of the binder in the surface layer, said surface layer not being a light-sensitive layer.
Claim 3
Dependent Claim
33 words
The silver halide photographic sensitive material of claim 1, wherein two or more other layers contain a mixture of gelatin produced by processing collagen in alkali gelatin produced by processing collagen in acid.
Claim 4
Dependent Claim
51 words
The silver halide photographic sensitive material of claim 1, wherein said gelatin produced by processing collagen in acid has an isoelectric point of a pH of about 6.0 to 9.5 and said gelatin produced by processing collagen in alkali has an isoelectric point of a pH of about 4.5 to 5.3.
Claim 5
Dependent Claim
51 words
The silver halide photographic sensitive material of claim 1, wherein said gelatin produced by processing collagen in acid has an isoelectric point of a pH of about 6.0 to 9.5 and said gelatin produced by processing collagen in alkali has an isoelectric point of a pH of about 4.5 to 5.3.
Claim 6
Dependent Claim
24 words
The silver halide photographic sensitive material of claim 1, wherein a layer adjacent said surface layer contains gelatin produced by processing collagen in alkali.
Claim 7
Dependent Claim
24 words
The silver halide photographic sensitive material of claim 2, wherein a layer adjacent said surface layer contains gelatin produced by processing collagen in alkali.
Claim 8
Dependent Claim
17 words
The silver halide photographic sensitive material of claim 1, wherein said surface layer contains a matting agent.
Claim 9
Dependent Claim
17 words
The silver halide photographic sensitive material of claim 2, wherein said surface layer contains a matting agent.
Claim 10
Dependent Claim
25 words
The silver halide photographic sensitive material of claim 7, wherein said matting agent has an average particle size of about 0.3 microns to 5 microns.
Claim 11
Dependent Claim
25 words
The silver halide photographic sensitive material of claim 8, wherein said matting agent has an average particle size of about 0.3 microns to 5 microns.
Claim 12
Dependent Claim
18 words
The silver halide photographic sensitive material of claim 1, wherein said surface layer includes a gelatin hardening agent.
Claim 13
Dependent Claim
18 words
The silver halide photographic sensitive material of claim 2, wherein said surface layer includes a gelatin hardening agent.
Claim 14
Dependent Claim
38 words
The silver halide photographic sensitive material of claim 1, wherein the proportion of gelatin produced by processing collagen in alkali ranges from about 5 to 80% of the amount of the gelatin produced by processing collagen in acid.
Claim 15
Dependent Claim
38 words
The silver halide photographic sensitive material of claim 2, wherein the proportion of gelatin produced by processing collagen in alkali ranges from about 5 to 80% of the amount of the gelatin produced by processing collagen in acid.
References Cited (Backward Citations)
US2101877A
Cited
US2398004A
Cited
US2976250A
Cited
US3507678A
Cited
US3551151A
Cited
GB1334397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |