Patent US4008087A successfully refreshed from Google Patents.
US4008087A
Expired / Lapsed
US
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Photographic light-sensitive material
Assignee: Fujifilm Holdings Corp
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Filing: 1975-08-04
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Granted: 1977-02-15
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Expires: 1995-08-04
Abstract
Abstract A photographic light-sensitive material comprising a support having thereon at least one silver halide photographic layer and at least one layer containing a styrene-maleic acid copolymer in which about 10 to 70 mol % of the carboxylic acid groups of the styrene-maleic acid copolymer is esterified with a compound represented by the following formula (I) ##STR1## wherein R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a phenyl group, and n is 1 or 2.
Inventors
- 👤 Masazumi Aono
- 👤 Shuichi Shindo
- 👤 Takushi Miyazako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:33
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/85; G03C1/89
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A photographic light-sensitive material comprising a support having thereon at least one silver halide photographic layer and at least one layer containing a styrene-maleic acid copolymer having a molecular weight ranging from about 2000 to 500,000, containing 20 to 60 mol % styrene and 40 to 80 mol % maleic acid, and in which about 10 to 70 mol % of the carboxylic acid groups of the styrene-maleic acid copolymer is esterified with a compound represented by the following formula (I) ##STR6## wherein R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a phenyl group, and n is 1 or 2.
Claim 2
Dependent Claim
107 words
A photographic light-sensitive material comprising a support having thereon at least one silver halide photographic layer and at least one layer containing a styrene-maleic acid copolymer having a molecular weight ranging from about 2000 to 500,000, containing 20 to 60 mol % styrene and 40 to 80 mol % maleic acid, and in which about 10 to 70 mol % of the carboxylic acid groups of the styrene-maleic acid copolymer is esterified with a compound represented by the following formula (I) ##STR6## wherein R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a phenyl group, and n is 1 or 2.
Claim 3
Dependent Claim
88 words
The photographic light-sensitive material of claim 1, wherein said styrene-maleic acid copolymer is represented by the general formula (II) ##STR7## wherein n is 1 or 2; w is 20 to 60 mol %; x is 0 to 40 mol %; y + z is 10 to 70 mol %; y is 0 to 70 mol %; z is 0 to 20 mol %; M is an alkali metal atom; and R is a hydrogen atom, an alkyl group having 1 to 4 carbon atoms or a phenyl group.
Claim 4
Dependent Claim
28 words
The photographic light-sensitive material of claim 2, wherein 50 to 80 mol % of the carboxylic groups unesterified are in the form of the alkali metal salt thereof.
Claim 5
Dependent Claim
22 words
The photographic light-sensitive material of claim 1, wherein said styrene-maleic acid copolymer has a molecular weight ranging from about 2,000 to 500,000.
Claim 6
Dependent Claim
27 words
The photographic light-sensitive material of claim 1, wherein said styrene-maleic acid copolymer is present at a coverage of about 5 to 500 mg/m 2 of said support.
Claim 7
Dependent Claim
44 words
The photographic light-sensitive material of claim 1, wherein said material includes at least one silver halide photographic emulsion layer on said support and wherein said at least one layer containing a styrene-maleic acid copolymer comprises an uppermost layer on said silver halide emulsion layer.
Claim 8
Dependent Claim
47 words
The photographic light-sensitive material of claim 1, including a support having thereon at least one blue-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer, at least one red-sensitive silver halide emulsion layer and at least one layer thereon containing said styrene-maleic acid copolymer.
References Cited (Backward Citations)
US3856530A
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US3791831A
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US3877947A
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US3753716A
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US3877942A
Cited
US3938999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |