Patent US3655407A successfully refreshed from Google Patents.
US3655407A
Expired / Lapsed
US
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Method of coating dilute aqueous emulsions
Assignee: Eastman Kodak Co
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Filing: 1969-03-10
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Granted: 1972-04-11
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Expires: 1989-03-10
Abstract
Abstract An aqueous composition of a hydrophilic colloid, wherein said colloid comprises from about .1 to about 6 per cent by weight of said solution, is given increased viscosity by the low-level addition of a copolymer comprising: (1) at least 50 mole per cent of units of an acrylic acid and (2) up to 50 mole per cent of units of an alkyl acrylate. The copolymer is added at a concentration in the range of about 0.01 to about 1 per cent by weight of the aqueous composition. Aqueous compositions of hydrophilic colloids such as, for example, silver halide photographic emulsions, are thickened as described and can be coated on a wide variety of supports in single- or multi-layer photographic elements.
Inventors
- 👤 Carl W Mcgraw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
105 words
A photographic element comprising a support and integral layers, at least one layer comprising a silver halide emulsion, wherein said integral layers contain the composition of matter comprising an aqueous composition of (A) a hydrophilic colloid wherein said colloid comprises from about 0.1 to about 6 percent by weight of said solution and (B) a copolymer comprising: (1) from at least about 50 to 95 mole percent of units of an acrylic acid and (2) from 5 up to about 50 moLe percent of units of an alkyl acrylate, wherein said copolymer comprises from about 0.1 to about 5 percent by weight of said colloid.
Claim 2
Independent Claim
90 words
A method for increasing the viscosity of an aqueous composition of a silver halide photographic emulsion containing a hydrophilic colloid in an amount from about 0.1 to about 6.0 percent by weight of said composition, the improvement which comprises incorporating therein a copolymer comprising (1) from at least 50 to 95 mole percent of units of an acrylic acid and (2) from 5 up to about 50 mole percent of units of alkyl acrylate, wherein said copolymer comprises from about 0.1 to about 5 percent by weight of said colloid.
Claim 3
Dependent Claim
11 words
The method of claim 3 wherein the hydrophilic colloid is gelatin.
Claim 4
Dependent Claim
20 words
The method of claim 3 wherein the copolymer comprises from about 80 to about 95 mole percent acrylic acid units.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |