US4927744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic element having solid particle dispersion oxidized developer scavenger
Assignee: Eastman Kodak Co
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Filing: 1988-08-05
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Granted: 1990-05-22
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Expires: 2008-08-05
Abstract
Abstract Photographic elements having an oxidized developer scavenger that is a solid particle dispersion of a hydroquinone derivative. The solid particle dispersion of the oxidized developer scavenger offers improved stability to oxidation compared to conventional dispersions of hydroquinone derivatives.
Inventors
- 👤 Richard P. Henzel
- 👤 Paul L. Zengerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:17
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
44 words
A photographic element comprising a support having thereon at least one silver halide emulsion layer, and a layer, which is the same or different from the silver halide layer, comprising solid particles dispersed in a vehicle, said particles consisting essentially of a hydroquinone derivative.
Claim 2
Dependent Claim
44 words
A photographic element comprising a support having thereon at least one silver halide emulsion layer, and a layer, which is the same or different from the silver halide layer, comprising solid particles dispersed in a vehicle, said particles consisting essentially of a hydroquinone derivative.
Claim 3
Dependent Claim
24 words
A photographic element according to claim 1 wherein the solid particles of oxidized developer scavenger have mean diameters ranging from 0.01 to 10.0 μm.
Claim 4
Dependent Claim
14 words
A photographic element according to claim 1 wherein the vehicle is a hydrophilic colloid.
Claim 5
Dependent Claim
13 words
A photographic element according to claim 3 wherein the hydrophilic colloid is gelatin.
Claim 6
Dependent Claim
29 words
A photographic element according to claim 1 further comprising a second silver halide emulsion layer and wherein the oxidized developer scavenger layer is between the two silver halide layers.
Claim 7
Dependent Claim
30 words
A photographic element according to claim 5 wherein the silver halide layers each comprise a coupler that can react with oxidized developer to form or release a photographically useful group.
Claim 8
Dependent Claim
28 words
A photographic element according to claim 1 wherein the hydroquinone derivative comprises two alkyl ballast groups, para to each other, having from 1 to 22 carbon atoms each.
Claim 9
Dependent Claim
28 words
A photographic element according to claim 1 wherein the hydroquinone derivative comprises two alkyl ballast groups, meta to each other, having from 1 to 22 carbon atoms each.
Claim 10
Dependent Claim
47 words
A process for incorporating a hydroquinone derivative oxidized developer scavenger in a layer of a photographic element, comprising the steps of: dispersing solid particles consisting essentially of the hydroquinone in an aqueous medium comprising a binder, and coating the resulting dispersion as a layer on a support.
Claim 11
Dependent Claim
47 words
A process for incorporating a hydroquinone derivative oxidized developer scavenger in a layer of a photographic element, comprising the steps of: dispersing solid particles consisting essentially of the hydroquinone in an aqueous medium comprising a binder, and coating the resulting dispersion as a layer on a support.
Claim 12
Dependent Claim
17 words
A process according to claim 9 wherein the solid particles are dispersed in the medium by milling.
Claim 13
Dependent Claim
13 words
A process according to claim 9 wherein the binder is a hydrophilic colloid.
References Cited (Backward Citations)
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US4366236A
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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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |