Patent US3989527A successfully refreshed from Google Patents.
US3989527A
Expired / Lapsed
US
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Silver halide photographic element containing blended grains
Assignee: Eastman Kodak Co
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Filing: 1975-01-08
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Granted: 1976-11-02
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Expires: 1995-01-08
Abstract
Abstract A photographic element is disclosed comprised of a support and, coated on the support, at least one radiation-sensitive layer. The radiation-sensitive layer contains silver halide grains including a spectral sensitizer adsorbed on the surface thereof and, intimately admixed therewith, silver halide grains free of surface spectral sensitization and having a particle size in the range of 0.15 to 0.8 micron in diameter. The photographic element exhibits improved speed without a concurrent increase in graininess.
Inventors
- 👤 David J. Locker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:16
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C2001/03564; Y; Y10; Y10S; Y10S430/00; Y10S430/149; Y10S430/151
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A photographic element comprising a support and, coated thereon, a radiation-sensitive layer containing silver halide grains having a mean particle size greater than about 0.9 micron in diameter and having 3,3',9-triethyl-5,5'-diphenyloxacarbocyanine bromide and anhydro-5,5',-6,6'-tetrachloro-1,1',3-triethyl-3'-(3-sulfobutyl)-benzimidazolocarbocyanine hydroxide as spectral sensitizers adsorbed on the surface thereof and intimately admixed therewith reflecting silver halide grains free of surface spectral sensitization and having a particle size greater than 0.40 micron and less than 0.60 micron in diameter, which, upon exposure, cause electromagnetic radiation to impact upon the surface of the spectrally sensitized silver halide grains.
Claim 2
Dependent Claim
90 words
A photographic element comprising a support and, coated thereon, a radiation-sensitive layer containing silver halide grains having a mean particle size greater than about 0.9 micron in diameter and having 3,3',9-triethyl-5,5'-diphenyloxacarbocyanine bromide and anhydro-5,5',-6,6'-tetrachloro-1,1',3-triethyl-3'-(3-sulfobutyl)-benzimidazolocarbocyanine hydroxide as spectral sensitizers adsorbed on the surface thereof and intimately admixed therewith reflecting silver halide grains free of surface spectral sensitization and having a particle size greater than 0.40 micron and less than 0.60 micron in diameter, which, upon exposure, cause electromagnetic radiation to impact upon the surface of the spectrally sensitized silver halide grains.
Claim 3
Dependent Claim
23 words
A photographic element according to claim 1 wherein said reflecting silver halide grains free of surface spectral sensitization are monodispersed silver halide grains.
Claim 4
Dependent Claim
19 words
A photographic element according to claim 1 wherein said spectrally sensitized silver halide grains are comprised of silver bromide.
Claim 5
Dependent Claim
18 words
A photographic element according to claim 1 wherein said spectrally sensitized silver halide grains are silver bromoiodide grains.
Claim 6
Dependent Claim
22 words
A photographic element according to claim 1 wherein said reflecting silver halide grains free of surface spectral sensitization are silver bromide grains.
Claim 7
Dependent Claim
22 words
A photographic element according to claim 5 wherein said reflecting silver halide grains free of surface spectral sensitization are silver bromoiodide grains.
Claim 8
Dependent Claim
48 words
A photographic element according to claim 1 wherein said silver halide grains free of surface spectral sensitization and said silver halide grains which are spectrally sensitized are each present within the range of from 1 to 99 percent, by weight, based on the total weight of silver halide.
Claim 9
Dependent Claim
49 words
A photographic element according to claim 7 wherein said reflecting silver halide grains free of surface spectral sensitization and said silver halide grains which are spectrally sensitized are each present within the range of from 10 to 90 percent, by weight, based on the total weight of silver halide.
Claim 10
Dependent Claim
144 words
A photographic element comprising a support and, coated thereon, a radiation-sensitive layer containing from 10 to 90 percent, by weight, based on total silver halide present, of silver bromoiodide grains having a mean particle size greater than about 0.9 micron in diameter and having 3,3',9-triethyl-5,5'-diphenyloxacarbocyanine bromide and anhydro-5,5',6,6'-tetrachloro-1,1',3-triethyl-3'-(3-sulfobutyl)-benzimidazolocarbocyanine hydroxide as spectral sensitizers adsorbed on the surface thereof, and from 10 to 90 percent, by weight, based on total silver halide present, of monodispersed reflecting silver halide grains free of surface spectral sensitization and having a particle size greater than 0.40 microns and less than 0.60 micron in diameter, said reflecting silver halide grains free of surface spectral sensitization being intimately admixed with said silver bromoiodide grains including spectral sensitizers adsorbed on the surface thereof which reflecting grains, upon exposure, cause electromagnetic radiation to impact upon the surface of the spectrally sensitized silver bromoidodide grains.
Claim 11
Dependent Claim
144 words
A photographic element comprising a support and, coated thereon, a radiation-sensitive layer containing from 10 to 90 percent, by weight, based on total silver halide present, of silver bromoiodide grains having a mean particle size greater than about 0.9 micron in diameter and having 3,3',9-triethyl-5,5'-diphenyloxacarbocyanine bromide and anhydro-5,5',6,6'-tetrachloro-1,1',3-triethyl-3'-(3-sulfobutyl)-benzimidazolocarbocyanine hydroxide as spectral sensitizers adsorbed on the surface thereof, and from 10 to 90 percent, by weight, based on total silver halide present, of monodispersed reflecting silver halide grains free of surface spectral sensitization and having a particle size greater than 0.40 microns and less than 0.60 micron in diameter, said reflecting silver halide grains free of surface spectral sensitization being intimately admixed with said silver bromoiodide grains including spectral sensitizers adsorbed on the surface thereof which reflecting grains, upon exposure, cause electromagnetic radiation to impact upon the surface of the spectrally sensitized silver bromoidodide grains.
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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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |