US5219715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic recording material and process
Assignee: Eastman Kodak Co
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Filing: 1992-01-30
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Granted: 1993-06-15
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Expires: 2012-01-30
Abstract
Abstract A color negative photographic recording material is described in which low emulsion coverage tabular grain silver halide emulsion imaging units are employed. The silver halide emulsion in at least one of the units comprises grains having a tabularity of between about 50 and 25,000. The imaging unit thickness is less than about 4.0 μm, using a total of no more than 2.0 parts by weight of silver per part of coupler. The imaging unit yields a density of at least 2.0 when exposed and processed.
Inventors
- 👤 Allan F. Sowinski
- 👤 George F. Wu
- 👤 Thomas B. Brust
- 👤 James T. Kofron
- 👤 Gary L. House
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:16
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3022
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
A process for forming a color negative image in an exposed color negative recording material, the process comprising the steps of a) developing the color negative recording material with a color developer to give a dye image having a maximum image dye density of at least 2.0 and a positive contrast of 0.9 or less, and then b) bleaching and fixing, or bleach-fixing, the material to remove silver and silver halide, the color negative recording material containing a support and at least two silver halide emulsion imaging units sensitive to different regions of the electromagnetic spectrum, each unit containing a dye forming coupler, at least one unit is a high tabularity unit which: a) comprises from 0.2 to 2.0 g/m 2 , based on silver, of a silver halide emulsion wherein greater than 50% of the projected area of the grains is provided by tabular grains having a tabularity of between 50 and 25,000; b) has a thickness of less than about 4.0 μm; and c) comprises no more than 2.0 parts by weight of silver per part by weight of coupler.
Claim 2
Dependent Claim
182 words
A process for forming a color negative image in an exposed color negative recording material, the process comprising the steps of a) developing the color negative recording material with a color developer to give a dye image having a maximum image dye density of at least 2.0 and a positive contrast of 0.9 or less, and then b) bleaching and fixing, or bleach-fixing, the material to remove silver and silver halide, the color negative recording material containing a support and at least two silver halide emulsion imaging units sensitive to different regions of the electromagnetic spectrum, each unit containing a dye forming coupler, at least one unit is a high tabularity unit which: a) comprises from 0.2 to 2.0 g/m 2 , based on silver, of a silver halide emulsion wherein greater than 50% of the projected area of the grains is provided by tabular grains having a tabularity of between 50 and 25,000; b) has a thickness of less than about 4.0 μm; and c) comprises no more than 2.0 parts by weight of silver per part by weight of coupler.
Claim 3
Dependent Claim
17 words
A process of claim 1, wherein the tabular grains have a tabularity of between 100 and 5,000.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the tabular grains have a tabularity of between 100 and 2,500.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein said high tabularity unit comprises at least two silver halide emulsion layers having different sensitivities to the same region of the spectrum.
Claim 6
Dependent Claim
19 words
The process of claim 4 wherein the more sensitive layer comprises from 0.10 to 1.0 g/m 2 of silver.
Claim 7
Dependent Claim
19 words
The process of claim 4 wherein the more sensitive layer comprises from 0.20 to 0.6 g/m 2 of silver.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein there is from 0.8 to 1.5 part of silver per part of coupler in the high tabularity unit.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein there is from 0.5 to 1 part of silver per part of coupler in the high tabularity unit.
Claim 10
Dependent Claim
20 words
The process of claim 1 wherein the unit thickness of the high tabularity unit is from 2.5 to 3.5 μm.
Claim 11
Dependent Claim
20 words
The process of claim 1 comprises at least 3 silver halide imaging units sensitive to different regions of the spectrum.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein the tabular grains comprise at least one of silver bromide or silver bromoiodide.
Claim 13
Dependent Claim
22 words
The process of claim 1 wherein the high tabularity unit is a cyan dye forming unit or a magenta dye forming unit.
Claim 14
Dependent Claim
16 words
The process of claim 1 wherein the high tabularity unit contains a development inhibitor releasing coupler.
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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) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |