US5399469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatially fixed absorber dyes in less sensitive layers
Assignee: Eastman Kodak Co
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Filing: 1993-10-13
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Granted: 1995-03-21
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Expires: 2013-10-13
Abstract
Abstract This invention relates to color photographic elements and processes and especially to color photographic elements comprising two or more image forming layers sensitized to the same region of the electromagnetic spectrum where a more sensitive layer is positioned closer to an exposure source than a less sensitive layer and the less sensitive layer additionally comprises a spatially fixed absorber dye. The combination provides improved image sharpness without compromising photographic sensitivity.
Inventors
- 👤 Richard P. Szajewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:46
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3029; G03C2200/00; G03C2200/23; G03C7/3003
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
156 words
A photographic element comprising a support bearing at least two light sensitive silver halide emulsion layers wherein: said layers are sensitive to the same region of the electromagnetic spectrum; and a more light sensitive layer of said at least two light sensitive silver halide emulsion layers is closer to an exposure source than a less light sensitive layer of said at least two light sensitive silver halide layers, said more light sensitive layer and said less light sensitive layer are sensitive to the same region of the electromagnetic spectrum, and; said less light sensitive layer comprises a spatially fixed absorber dye that absorbs light in substantially the same region of the electromagnetic spectrum as said light sensitive silver halide; wherein said spatially fixed absorber dye does not substantially contribute to the spectral sensitivity of said less sensitive silver halide emulsion layer, and the thickness of said element above the support is between 5 and 30 microns.
Claim 2
Dependent Claim
156 words
A photographic element comprising a support bearing at least two light sensitive silver halide emulsion layers wherein: said layers are sensitive to the same region of the electromagnetic spectrum; and a more light sensitive layer of said at least two light sensitive silver halide emulsion layers is closer to an exposure source than a less light sensitive layer of said at least two light sensitive silver halide layers, said more light sensitive layer and said less light sensitive layer are sensitive to the same region of the electromagnetic spectrum, and; said less light sensitive layer comprises a spatially fixed absorber dye that absorbs light in substantially the same region of the electromagnetic spectrum as said light sensitive silver halide; wherein said spatially fixed absorber dye does not substantially contribute to the spectral sensitivity of said less sensitive silver halide emulsion layer, and the thickness of said element above the support is between 5 and 30 microns.
Claim 3
Dependent Claim
13 words
A color photographic element according to claim 1 comprising image dye forming couplers.
Claim 4
Dependent Claim
25 words
The element of claim 1 wherein said element comprises three or more silver halide layers each sensitive to the same region of the electromagnetic spectrum.
Claim 5
Dependent Claim
80 words
The element of claim 1 comprising: a red light sensitive color record comprising a red light sensitized silver halide emulsion having in reactive association a cyan dye forming image coupler; a green light sensitive color record comprising a green light sensitized silver halide emulsion having in reactive association a magenta dye forming image coupler; and a blue light sensitive color record further comprising a blue light sensitized silver halide emulsion having in reactive association a yellow dye forming image coupler.
Claim 6
Dependent Claim
29 words
The element of claim 1 wherein at least one of said two light sensitive silver halide emulsion layers comprises tabular grains having an aspect ratio greater than about 2.
Claim 7
Dependent Claim
17 words
The element of claim 1 wherein said spatially fixed absorber dye absorbs red, green or blue light.
Claim 8
Dependent Claim
25 words
The element of claim 1 comprising a development inhibitor releasing compound; said compound enabling release of a development inhibitor as a result of photographic processing.
Claim 9
Dependent Claim
36 words
The element of claim 1 comprising a development inhibitor releasing coupler; said coupler enabling release of a development inhibitor as a result of a coupling reaction with an oxidized form of a paraphylene diamine developing agent.
Claim 10
Dependent Claim
28 words
The element of claim 1 wherein at least one of said two light sensitive silver halide emulsion layers comprises grains having an aspect ratio greater than about 5.
Claim 11
Dependent Claim
14 words
The element of claim 1 wherein said light sensitive layers are both spectrally sensitized.
Claim 12
Dependent Claim
20 words
The element of claim 1 wherein said spatially fixed absorber dye enables a reduction in sensitivity of at least 1%.
Claim 13
Dependent Claim
20 words
The element of claim 1 wherein said spatially fixed absorber dye enables a reduction in sensitivity of at least 5%.
Claim 14
Dependent Claim
20 words
The element of claim 1 wherein said spatially fixed absorber dye enables a reduction in sensitivity of at least 20%.
Claim 15
Dependent Claim
20 words
The element of claim 1 comprising between 1 and 10 grams per square meter of total silver in said element.
Claim 16
Dependent Claim
12 words
The element of claim 1 where said silver halide layers are contiguous.
Claim 17
Dependent Claim
26 words
The element of claim 1 wherein said silver halide layers are separated by one or more intervening layers that may contain light sensitive silver halide emulsions.
Claim 18
Dependent Claim
38 words
The element of claim 1 wherein the quantity of said spatially fixed absorber dye contained in said less light sensitive layer is greater than the quantity of said spatially fixed dye contained in said more light sensitive layer.
Claim 19
Dependent Claim
17 words
The element of claim 17 wherein said more light sensitive layer contains essentially no spatially fixed dye.
Claim 20
Dependent Claim
20 words
The element of claim 1 wherein total silver in said element is less than about 7 grams per square meter.
Claim 21
Dependent Claim
19 words
The element of claim 1 wherein the thickness of said element above the support is less than 25 microns.
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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) | 1998-03-20 | 1998-09-19 | 1999-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-20 | 2002-09-19 | 2003-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-20 | 2006-09-19 | 2007-03-21 | $7700.00 | Window Closed / Lapsed |