US4207393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic contrast enhancers
Assignee: 3M Co
•
Filing: 1979-03-09
•
Granted: 1980-06-10
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Expires: 1999-03-09
Abstract
Abstract Certain phenolic compounds have been found to enhance the contrast of dispersed coupler color photographic elements when the coupler is a 1-phenyl-3-anilino-5-pyrazolone magenta coupler.
Inventors
- 👤 Warren L. Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:26
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
76 words
An unexposed, undeveloped color photographic silver halide dispersion in a layer comprising a hydrophilic colloid, silver halide, and an oil droplet dispersion of a 1-phenyl-3-anilino-5-pyrazolone color photographic coupler, wherein said layer also contains therein an effective amount of a contrast enhancer of the formula ##STR20## wherein A is selected from the group consisting of ##STR21## wherein n is 1, 2, 3, or 4, and R is H, OH, or alkyl of 1 to 3 carbon atoms.
Claim 2
Dependent Claim
76 words
An unexposed, undeveloped color photographic silver halide dispersion in a layer comprising a hydrophilic colloid, silver halide, and an oil droplet dispersion of a 1-phenyl-3-anilino-5-pyrazolone color photographic coupler, wherein said layer also contains therein an effective amount of a contrast enhancer of the formula ##STR20## wherein A is selected from the group consisting of ##STR21## wherein n is 1, 2, 3, or 4, and R is H, OH, or alkyl of 1 to 3 carbon atoms.
Claim 3
Dependent Claim
27 words
The layer of claim 1 wherein said contrast enhancer is present in an amount which provides a molar ratio of enhancer/color coupler of between 0.05/1 and 2/1.
Claim 4
Dependent Claim
29 words
The layer of claim 2 wherein at least some of said contrast enhancer is present in the dispersion within oil droplets within which said color photographic couplers are dissolved.
Claim 5
Dependent Claim
27 words
The layer of claim 1 wherein said contrast enhancer is present in an amount which provides a molor ratio of enhancer/color coupler of between 0.4/ and 1.5/1.
Claim 6
Dependent Claim
29 words
The layer of claim 4 wherein at least some of said contrast enhancer is present in the dispersion within oil droplets within which said color photographic couplers are dissolved.
Claim 7
Dependent Claim
13 words
The emulsion of claim 4 wherein A is ##STR22## wherein R is H.
Claim 8
Dependent Claim
13 words
The emulsion of claim 5 wherein A is ##STR23## wherein R is H.
Claim 9
Dependent Claim
29 words
The layer of claim 1 wherein at least some of said contrast enhancer is present in the dispersion within oil droplets within which said color photographic couplers are dissolved.
Claim 10
Dependent Claim
13 words
The emulsion of claim 8 wherein A is ##STR24## wherein R is H.
Claim 11
Dependent Claim
13 words
The emulsion of claim 1 wherein A is ##STR25## wherein R is H.
Claim 12
Dependent Claim
76 words
An unexposed, undeveloped color photographic silver halide dispersion in a layer comprising a hydrophilic colloid, silver halide, and an oil droplet dispersion of a 1-phenyl-3-anilino-5-pyrazolone color photographic coupler, wherein said layer also contains therein an effective amount of a constrast enhancer of the formula ##STR26## wherein A is selected from the group consisting of ##STR27## wherein n is 1, 2, 3, or 4, and R is H, OH, or alkyl of 1 or 3 carbon atoms.
Claim 13
Dependent Claim
76 words
An unexposed, undeveloped color photographic silver halide dispersion in a layer comprising a hydrophilic colloid, silver halide, and an oil droplet dispersion of a 1-phenyl-3-anilino-5-pyrazolone color photographic coupler, wherein said layer also contains therein an effective amount of a constrast enhancer of the formula ##STR26## wherein A is selected from the group consisting of ##STR27## wherein n is 1, 2, 3, or 4, and R is H, OH, or alkyl of 1 or 3 carbon atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |