Patent US4840884A successfully refreshed from Google Patents.
US4840884A
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Photographic element and process comprising a dye releasing group
Assignee: Eastman Kodak Co
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Filing: 1987-10-19
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Granted: 1989-06-20
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Expires: 2007-10-19
Abstract
Abstract A new photographic coupler comprises a coupling-off group bonded to the coupler at the coupling position represented by the formula: --L--NR.sup.1 --DYE wherein L is a linking group; NR 1 is a substituted nitrogen atom bonded to DYE that together with NR 1 is a releasable dye comprising an electrically neutral chromophore. Such a coupler enables dye hue stabilization without mordanting the dye formed. Such a new coupler is useful in a photographic silver halide element and process to provide increased dye density, higher contrast dye images, and lower pH sensitivity upon processing.
Inventors
- 👤 Jared B. Mooberry
- 👤 Stephen P. Singer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:37
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30541; G03C7/30547; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/159
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A photographic element comprising a support bearing a silver halide photographic emulsion and a coupler having a coupling-off group bonded to the coupler at the coupling position wherein the coupling-off group is represented by the formula: ##STR92## wherein L is a linking group cleavable from ##STR93## after coupling-off and contains --B-- bonded to ##STR94## wherein --B-- is ##STR95## is a substituted nitrogen atom bonded to DYE that together with the substituted nitrogen atom is a releasable dye comprising an electrically neutral chromophore; wherein the linking group enables a spectral shift in absorption of DYE.
Claim 2
Dependent Claim
94 words
A photographic element comprising a support bearing a silver halide photographic emulsion and a coupler having a coupling-off group bonded to the coupler at the coupling position wherein the coupling-off group is represented by the formula: ##STR92## wherein L is a linking group cleavable from ##STR93## after coupling-off and contains --B-- bonded to ##STR94## wherein --B-- is ##STR95## is a substituted nitrogen atom bonded to DYE that together with the substituted nitrogen atom is a releasable dye comprising an electrically neutral chromophore; wherein the linking group enables a spectral shift in absorption of DYE.
Claim 3
Dependent Claim
41 words
A photographic element as in claim 1 wherein the linking group is represented by the formula: ##STR96## wherein A is O, S, or sulfonamido; B is ##STR97## X 7 is a substituent; and n is 0, 1, 2, 3 or 4.
Claim 4
Dependent Claim
17 words
A photographic element as in claim 1 wherein the linking group is represented by the formula: ##STR98##
Claim 5
Dependent Claim
17 words
A photographic element as in claim 1 wherein the coupling-off group is represented by the formula: ##STR99##
Claim 6
Dependent Claim
26 words
A photographic element as in claim 1 wherein ##STR100## represents the atoms necessary to complete an azoaniline, methine or azamethine dye comprising an electrically neutral chromophore.
Claim 7
Dependent Claim
16 words
A photographic element as in claim 1 wherein the coupler is represented by the formula: ##STR101##
Claim 8
Dependent Claim
79 words
A photographic element as in claim 1 which comprises at least one blue-sensitive photographic silver halide emulsion layer containing at least one yellow image dye-forming coupler; at least one green-sensitive photographic silver halide emulsion layer containing at least one magenta image dye-forming coupler; and at least one red-sensitive photographic silver halide emulsion layer containing at least one cyan image dye-forming layer and wherein at least on of the image-dye forming couplers is a coupler as defined in claim 1.
Claim 9
Dependent Claim
35 words
A process of forming a photographic image which comprises developing an exposed photographic silver halide emulsion layer with a color developIng agent in the presence of an image dye-forming coupler as defined in claim 1.
Claim 10
Dependent Claim
16 words
A process as in claim 8 wherein the coupling-off group is represented by the formula: ##STR102##
Claim 11
Dependent Claim
13 words
A process as in claim 9 wherein the image dye-forming coupler is: ##STR103##
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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) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |