US3844795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic material containing azo masking couplers
Assignee: Agfa Gevaert AG
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Filing: 1972-05-04
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Granted: 1974-10-29
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Expires: 1992-05-04
Abstract
Abstract A light sensitive color photographic material having at least one silver halide emulsion layer which contains a red azo masking coupler of the following formula: WHEREIN R1, R2, R3 and R4 are as defined in the description, which red cyan coupler has advantageous properties with respect to suitable absorption dyes, efficient emulsifiability and excellent reactivity.
Inventors
- 👤 D Kalz
- 👤 W Puschel
- 👤 G Benoy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:41
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/333; G03C7/3335; C; C09; C09B; C09B29/00; C09B29/10; C09B29/18; C09B29/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
29 words
A LIGHT SENSITIVE COLOR PHOTOGRAPHIC MATERIAL HAVING AT LEAST ONE SILVER HALIDE EMULSION LAYER WHICH CONTAINS A RED CYAN COUPLER, WHICH CYAN COUPLER IS OF THE FOLLOWING GENERAL FORMULA:
Claim 2
Dependent Claim
29 words
A LIGHT SENSITIVE COLOR PHOTOGRAPHIC MATERIAL HAVING AT LEAST ONE SILVER HALIDE EMULSION LAYER WHICH CONTAINS A RED CYAN COUPLER, WHICH CYAN COUPLER IS OF THE FOLLOWING GENERAL FORMULA:
Claim 3
Dependent Claim
32 words
A material as claimed in claim 1 in which R1, R2 and R3 represents alkyl and one of R1, R2 or R3 is an alkyl radical with 12 to 18 carbon atoms.
Claim 4
Dependent Claim
25 words
A material as claimed in claim 1 in which the red cyan couplers are incorporated in the silver halide emulsion layer in an emulsified form.
Claim 5
Dependent Claim
30 words
A material as claimed in claim 3 in which 10 to 100 percent, based on the quantity of dye used, of dibutylphthalate is added to the dye solution before emulsification.
Claim 6
Dependent Claim
33 words
A material as claimed in claim 1 containing in the silver halide emulsion layer in addition colorless cyan coupler selected from the group consisting of cyan couplers of the phenol or naphthol series.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |