US5141844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric dye-forming couplers
Assignee: Eastman Kodak Co
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Filing: 1990-05-07
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Granted: 1992-08-25
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Expires: 2010-05-07
Abstract
Abstract Photographic elements are described containing polymeric dye-forming couplers in which the polymer contains coupler moieties that upon reaction with oxidized color developing agent yield dyes of a least two different hues. In one embodiment a neutral dye is formed. In another embodiment a minor proportion of one coupler moiety is used to modify or current the spectral absorption characteristics of another coupler moiety.
Inventors
- 👤 Philip T. S. Lau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:54
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/327; G03C7/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A photographic element, comprising a support, a silver halide emulsion layer and a polymeric dye-forming coupler containing repeating coupler comonomer units that form dyes of at least two different hues, wherein the identity and proportions of the coupler comonomers are such that a neutral dye is obtained upon reaction of the polymeric coupler with oxidized silver halide developing agent.
Claim 2
Dependent Claim
59 words
A photographic element, comprising a support, a silver halide emulsion layer and a polymeric dye-forming coupler containing repeating coupler comonomer units that form dyes of at least two different hues, wherein the identity and proportions of the coupler comonomers are such that a neutral dye is obtained upon reaction of the polymeric coupler with oxidized silver halide developing agent.
Claim 3
Dependent Claim
14 words
A photographic element of claim 1, wherein the polymeric coupler is an addition polymer.
Claim 4
Dependent Claim
14 words
A photographic element of claim 1, wherein the polymeric coupler is a condensation polymer.
Claim 5
Dependent Claim
75 words
A photographic element comprising a support, a silver halide emulsion layer and a polymeric dye-forming coupler that upon reaction with oxidizing color developing agent forms a neutral dye, comprising repeating units derived from a cyan dye-forming coupler comonomer, a magenta dye-forming coupler comonomer, and a yellow dye-forming coupler comonomer, the molar ratio of the comonomers being 90 to 100 parts cyan comonomer, 30 to 100 parts magenta comonomer and 60 to 150 parts yellow comonomer.
Claim 6
Dependent Claim
75 words
A photographic element comprising a support, a silver halide emulsion layer and a polymeric dye-forming coupler that upon reaction with oxidizing color developing agent forms a neutral dye, comprising repeating units derived from a cyan dye-forming coupler comonomer, a magenta dye-forming coupler comonomer, and a yellow dye-forming coupler comonomer, the molar ratio of the comonomers being 90 to 100 parts cyan comonomer, 30 to 100 parts magenta comonomer and 60 to 150 parts yellow comonomer.
Claim 7
Dependent Claim
31 words
A photographic element of claim 4, wherein the cyan coupler comonomer has the structure ##STR7## the magenta coupler comonomer has the structure ##STR8## the yellow coupler comonomer has the structure ##STR9##
Claim 8
Dependent Claim
31 words
A photographic element of claim 5 wherein the molar ratio of the coupler comonomers is 100 parts cyan coupler comonomer, 30 parts magenta coupler comonomer and 80 parts yellow coupler comonomer.
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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) | 1995-08-25 | 1996-02-24 | 1996-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-25 | 2000-02-24 | 2000-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-25 | 2004-02-24 | 2004-08-25 | $7700.00 | Window Closed / Lapsed |