US3770445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide color photographic material containing couplers substituted with dicyclopentyl phenoxy groups
Assignee: Agfa Gevaert AG
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Filing: 1971-08-04
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Granted: 1973-11-06
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Expires: 1991-08-04
Abstract
Abstract A colorphotographic material with at least one silver halide emulsion layer which contains in dispersed form a color coupler substituted with a dicyclopentyl phenoxy group. This substitution lowers the melting point of the coupler and increases its solubility in solvents used to incorporate the couplers in photographic layers. Layers with these couplers are accordingly more stable.
Inventors
- 👤 W Pelz
- 👤 H Credner
- 👤 W Schulte
- 👤 F Nittel
- 👤 A Klein
- 👤 K Wedemeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:35
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3212
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
The combination of claim 1 wherein the dicyclopentyl phenoxy group is linked to the remainder of the color coupler through a bridging member of the following formula: -NH-(CH2)n-or
Claim 2
Dependent Claim
39 words
The combination of claim 2 wherein the layer is a light-sensitive silver halide gelatin emulsion, the color coupler is a cyan coupler of the phenol or Alpha -naphthol series, and is dispersed in the emulsion without an oil former.
Claim 3
Dependent Claim
13 words
The combination of claim 2 wherein the color coupler has the following formula:
Claim 4
Dependent Claim
11 words
The combination of claim 4 wherein R represents a methyl group.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |