US3772031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide grains and photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1971-12-02
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Granted: 1973-11-13
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Expires: 1991-12-02
Abstract
Abstract Radiation-sensitive silver halide grains, having ions of the Sulfur Group dispersed throughout the interior of the grains in an amount less than that which, on exposure, promote internal latent image formation, exhibit increased photographic speed. Such silver halide grains are surface sensitive, and can be further surface sensitized with chemical sensitizers. These grains can be used to prepare photographic emulsions and elements. The grains themselves can be prepared using convenient precipitation techniques.
Inventors
- 👤 C Berry
- 👤 S Marino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C1/06; G03C1/08; G03C2200/00; G03C2200/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
56 words
Radiation-sensitive chemically surface sensitized silver halide grains having ions of the Sulfur Group substantially uniformly dispersed throughout the interior of said grains in an amount ranging from about 2 to about 10 parts per million parts of silver; said ions being selected from the group consisting of sulfur ions, selenium ions, tellurium ions, and mixtures thereof.
Claim 2
Dependent Claim
23 words
Radiation-sensitive silver halide grains as described in claim 2 wherein the surface sensitizer for said grains is sulfur, selenium or sulfur and gold.
Claim 3
Dependent Claim
17 words
Radiation-sensitive silver halide grains as described in claim 2 wherein the Sulfur Group ions comprise sulfur ions.
Claim 4
Dependent Claim
17 words
Radiation-sensitive silver halide grains as described in claim 2 wherein the Sulfur Group ions comprise selenium ions.
Claim 5
Dependent Claim
34 words
Radiation-sensitive silver halide grains as described in claim 2 wherein the Sulfur Group ions are in said grains in an amount ranging from about 3 to about 5 parts per million parts of silver.
Claim 6
Dependent Claim
21 words
Radiation-sensitive silver halide grains as described in claim 2 wherein the silver halide comprises silver bromide, silver chlorobromide, or silver bromoiodide.
Claim 7
Dependent Claim
23 words
A radiation-sensitive element comprising a support having thereon at least one silver halide layer comprising silver halide grains as described in claim 1.
Claim 8
Dependent Claim
23 words
A radiation-sensitive element comprising a support having thereon at least one silver halide layer comprising silver halide grains as described in claim 2.
Claim 9
Dependent Claim
19 words
A radiation-sensitive element as described in claim 9 wherein said silver halide layer is a silver halide emulsion layer.
Claim 10
Dependent Claim
58 words
A radiation-sensitive silver halide emulsion comprising silver halide grains having ions of the Sulfur Group substantially uniformly dispersed throughout the interior of said grains in an amount ranging from about 2 to about 10 parts per million parts of silver; said ions being selected from the group consisting of sulfur ions, selenium ions, tellurium ions, and mixtures thereof.
Claim 11
Dependent Claim
19 words
A radiation-sensitive silver halide emulsion as described in claim 11 wherein the silver halide grains are chemically surface sensitized.
Claim 12
Dependent Claim
24 words
A radiation-sensitive silver hAlide emulsion as described in claim 12 wherein the surface sensitizer for said grains is sulfur, a noble metal, or selenium.
Claim 13
Dependent Claim
91 words
A process for preparing radiation-sensitive silver halide emulsions comprising silver halide grains having ions of the Sulfur Group substantially uniformly dispersed throughout the interior of said grains in an amount less than that which promotes internal latent image formation on exposure, the process comprising introducing said ions of the Sulfur Group into said grains during their formation in an amount ranging from about 2 to about 10 parts per million parts of silver; said ions being selected from the group consisting of sulfur ions, selenium ions, tellurium ions, and mixtures thereof.
Claim 14
Dependent Claim
117 words
A process for preparing radiation-sensitive silver halide emulsions comprising silver halide grains having ions of the Sulfur Group substantially uniformly dispersed throughout the interior of said grains in an amount less than that which promotes internal latent image formation on exposure, the process comprising forming said silver halide grains in the presence of a chemical compound capable of contributing ions of the Sulfur Group to said grains, said chemical compound being present in a concentration sufficient to contribute said ions in an amount of from about 2 parts per million to about 10 parts per million parts of silver; said ions being selected from the group consisting of sulfur ions, selenium ions, tellurium ions, and mixtures thereof.
Claim 15
Dependent Claim
17 words
A process as described in claim 15 which further comprises the step of chemically sensitizing said grains.
References Cited (Backward Citations)
US3317322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |