US3615602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-photographic silver halide emulsion containing colored cyan-forming couplers
Assignee: Agfa Gevaert AG
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Filing: 1968-01-09
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Granted: 1971-10-26
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Expires: 1988-01-09
Abstract
Abstract This invention relates to a photographic silver halide emulsion providing improved cyan color reproduction. The emulsion contains colored cyan couplers for the production of integral masks, which couplers have an absorption maximum between 490 and 510 millimicrons. Color couplers which react upon photographic development with the oxidation product of aromatic amino developers to form colored images are well known. Generally these color-forming couplers are colorless or substantially colorless. This lack of color is desirable when the coupler is to be incorporated in the emulsion layer and the unused coupler remains in the layer after formation of the dye.
Inventors
- 👤 Hans-Heinrich Credner
- 👤 Wolfgang Muller-Bardorff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:44
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/333; G03C7/3335
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
14 words
The combination of claim 1 in which the colored cyan-forming coupler of the formula:
Claim 2
Dependent Claim
14 words
The combination of claim 1 in which the colored cyan-forming coupler of the formula:
Claim 3
Dependent Claim
14 words
The combination of claim 1 in which the colored cyan-forming coupler of the formula:
Claim 4
Dependent Claim
14 words
The combination of claim 1 in which the colored cyan-forming coupler has the formula:
Claim 5
Dependent Claim
18 words
The combination of claim 1 in which the emulsion is a part of a multilayer color photographic material.
Claim 6
Dependent Claim
19 words
The combination of claim 1, wherein a colorless cyan-forming coupler is present in addition to the colored cyan-forming coupler.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |