Patent US3894875A successfully refreshed from Google Patents.
US3894875A
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US
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Silver halide emulsions containing yellow dye-forming couplers exhibiting very low pH sensitivity
Assignee: Eastman Kodak Co
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Filing: 1973-11-28
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Granted: 1975-07-15
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Expires: 1993-11-28
Abstract
Abstract A class of pivalyl aryloxy ketomethylene color-forming coupler compounds exhibit high reactivity with oxidized color developer over a wide range of alkaline pH conditions. Compounds having this unique capability have the structure: WHEREIN N IS FROM ABOUT 9 TO ABOUT 25 AND M is a monovalent cation.
Inventors
- 👤 Robert G Cameron
- 👤 William J Gass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:55
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
25 words
A LIGHT-SENSITIVE SILVER HALIDE EMULSION CONTAINING A COLOR-FORMING COUPLER COMPOUND CAPABLE OF HIGH REACTIVITY OVER A WIDE ALKALINE PH RANGE, SAID COUPLER HAVING THE STRUCTURE:
Claim 2
Dependent Claim
25 words
A LIGHT-SENSITIVE SILVER HALIDE EMULSION CONTAINING A COLOR-FORMING COUPLER COMPOUND CAPABLE OF HIGH REACTIVITY OVER A WIDE ALKALINE PH RANGE, SAID COUPLER HAVING THE STRUCTURE:
Claim 3
Dependent Claim
18 words
A light-sensitive silver halide emulsion as in claim 1, wherein n is from about 11 to about 19.
Claim 4
Dependent Claim
14 words
A light-sensitive silver halide emulsion as in claim 1, wherein n is about 15.
Claim 5
Dependent Claim
14 words
A light-sensitive silver halide emulsion as in claim 1, wherein n is about 11.
Claim 6
Dependent Claim
32 words
A photographic element comprising a photographic support coated with at least one photosensitive silver halide emulsion layer; said layer containing lightsensitive silver halide, hydrophilic colloid, and a color-forming coupler having the structure:
Claim 7
Dependent Claim
32 words
A photographic element comprising a photographic support coated with at least one photosensitive silver halide emulsion layer; said layer containing lightsensitive silver halide, hydrophilic colloid, and a color-forming coupler having the structure:
Claim 8
Dependent Claim
30 words
A photographic element as in claim 5, wherein said color-forming coupler is present in said layer in an amount equal to about 3 X 10 5 moles per square decimeter.
Claim 9
Dependent Claim
17 words
A photographic element as in claim 6, wherein said n is from about 11 to about 19.
Claim 10
Dependent Claim
13 words
A photographic element as in claim 6, wherein said n is about 15.
Claim 11
Dependent Claim
14 words
A light-sensitive silver halide emUlsion as in claim 6, wherein n is about 11.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |