Patent US3973979A successfully refreshed from Google Patents.
US3973979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic materials containing diffusion fast pyrazolone couplers
Assignee: Agfa Gevaert AG
•
Filing: 1974-05-14
•
Granted: 1976-08-10
•
Expires: 1994-05-14
Abstract
Abstract Improved 5-pyrazolone couplers of the following formula ##SPC1##wherein R,R 1 R 2 ,X and A denotes as described hereinafter for use in lightsensitive color photographic materials which are easy to prepare and give rise after chromogenic development to magenta dyes with improved stability to light.
Inventors
- 👤 Ernst Meier
- 👤 Hans Glockner
- 👤 Karl Kuffner
- 👤 Immo Boie
- 👤 Karl-Wilhelm Schranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:56
CPC Classifications
C; C07; C07C; C07C243/00; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/26; C07D231/28; C07D231/30; C07D231/32; C07D231/44; C07D231/52; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3212
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
241 words
A light-sensitive color-photographic material which contains at least one silver halide emulsion layer and a pyrazolone coupler, characterized by having a 5-pyrazolone coupler group to which is attached in the 1- or 3- position of the 5-pyrazolone coupler in a substituent of the pyrazolone coupler in its 1- or 3-position or as a substituent of the pyrazolone coupler in its 3-position a hydroquinone diether group of the formula: ##SPC14## in which R 2 represents an alkylene group, in which alkylene group one hydrogen may be substituted by an alkyl group and in cases where R 2 is attached to the 3-position or to one of the substituents in the 1- or 3-position of the pyrazolone coupler through a connecting member --OCONH--, the number of carbon atoms in the alkylene group is even, R represents an alkyl or cycloalkyl group and R 1 represents hydrogen or an alkyl group and wherein the substituents of the pyrazolone coupler in its 3-position are selected from the group consisting of alkyl, alkylamino, arylamino and acylamino and in its 1-position are selected from the group consisting of aryl and methyl substituted with carbamyl, phenyl or trifluoromethyl and said pyrazolone coupler contains in its 3-position at least one of said 3-position substituents when the hydroquinone diether group is attached to the 1-position, and said pyrazolone coupler contains in its 1-position at least one of said 1-position substituents when the hydroquinone diether group is attached to the 3-position.
Claim 2
Dependent Claim
241 words
A light-sensitive color-photographic material which contains at least one silver halide emulsion layer and a pyrazolone coupler, characterized by having a 5-pyrazolone coupler group to which is attached in the 1- or 3- position of the 5-pyrazolone coupler in a substituent of the pyrazolone coupler in its 1- or 3-position or as a substituent of the pyrazolone coupler in its 3-position a hydroquinone diether group of the formula: ##SPC14## in which R 2 represents an alkylene group, in which alkylene group one hydrogen may be substituted by an alkyl group and in cases where R 2 is attached to the 3-position or to one of the substituents in the 1- or 3-position of the pyrazolone coupler through a connecting member --OCONH--, the number of carbon atoms in the alkylene group is even, R represents an alkyl or cycloalkyl group and R 1 represents hydrogen or an alkyl group and wherein the substituents of the pyrazolone coupler in its 3-position are selected from the group consisting of alkyl, alkylamino, arylamino and acylamino and in its 1-position are selected from the group consisting of aryl and methyl substituted with carbamyl, phenyl or trifluoromethyl and said pyrazolone coupler contains in its 3-position at least one of said 3-position substituents when the hydroquinone diether group is attached to the 1-position, and said pyrazolone coupler contains in its 1-position at least one of said 1-position substituents when the hydroquinone diether group is attached to the 3-position.
Claim 3
Dependent Claim
62 words
A material as claimed in claim 1 in which the hydroquinone diether group is connected to the substituents in 1- or 3-position through a chemical bond or through a bivalent connecting member selected from the group consisting of --O--; --CONH--; --NHCO--; --NHCONH--; --COO-- and --OCONH--, or is connected to the 3-position directly through a bivalent connecting member of said connecting member group.
Claim 4
Dependent Claim
23 words
A material as claimed in claim 1 in which R 2 represents an alkylene group which contains from 1 to 22 carbon atoms.
Claim 5
Dependent Claim
19 words
A material as claimed in claim 3 in which R 2 represents a methylene, ethylene, propylene or butylene group.
Claim 6
Dependent Claim
34 words
A material as claimed in claim 1 in which R 2 represents an alkylene group in which one hydrogen atom has been substituted by an alkyl group which contains 1 to 18 carbon atoms.
Claim 7
Dependent Claim
34 words
A material as claimed in claim 1 in which R 2 represents an alkylene group in which the hydrogen atom which is substituted by an alkyl group in the α-position to the ether oxygen.
Claim 8
Dependent Claim
27 words
A material as claimed in claim 1 in which R represents an alkyl group containing from 1 to 18 carbon atoms or a cyclohexyl or cyclopentyl group.
Claim 9
Dependent Claim
23 words
A material as claimed in claim 1 in which R 1 represents an alkyl group which contains from 1 to 14 carbon atoms.
Claim 10
Dependent Claim
23 words
A material as claimed in claim 8 in which R 1 represents an alkyl group which contains from 4 to 14 carbon atoms.
Claim 11
Dependent Claim
28 words
A material as claimed in claim 1 in which the 5-pyrazolone coupler is a 1-phenyl pyrazolone coupler which contains in its phenyl group at least one chlorine atom.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |