Patent US4038075A successfully refreshed from Google Patents.
US4038075A
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US
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Development of photographic silver halide material
Assignee: Agfa Gevaert NV
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Filing: 1976-01-13
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Granted: 1977-07-26
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Expires: 1996-01-13
Abstract
Abstract A method is described of developing a photographic silver halide element containing developable silver halide by means of a silver halide developing composition, comprising as development activator a derivative of a polyethylene glycol or a C 1 -C 5 monoalkyl ether thereof corresponding to the formula: R.sub.1 O(CH.sub.2 CH.sub.2 O).sub.n X--A--Y--R.sub.2 wherein R 1 is hydrogen, C 1 -C 5 alkyl or the group X--A--Y--R 2 n is an integer of at least 4 X is CO, SO 2 , CONH or, when R 1 is X--A--Y--R 2 may be a chemical monovalent bond, A is alkylene or arylene, Y is a sulphur or selenium atom, and R 2 is an alkyl group.
Inventors
- 👤 Robert Joseph Pollet
- 👤 Francis Jeanne Sels
- 👤 Camille Angelina Vandeputte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:28
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/3056; C; C07; C07C; C07C323/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
A method of developing a photographic silver halide element containing imagewise developable silver halide by means of a silver halide developing solution wherein the developing solution contains a silver halide developing agent and a derivative of a polyethylene glycol or a C 1 -C 5 monoalkyl ether thereof corresponding to the formula: R.sub.1 O(CH.sub.2 CH.sub.2 O).sub.n X--A--Y--R.sub.2 wherein R 1 is hydrogen, C 1 -C 5 alkyl or the group X--A--Y--R 2 n is an integer of at least 4 X is CO, SO 2 , CONH or, when R 1 is X--A--Y--R 2 may be a chemical monovalent bond, A is alkylene or arylene, Y is a sulphur or selenium atom, and R 2 is an alkyl group.
Claim 2
Independent Claim
119 words
A method of developing a photographic silver halide element containing imagewise developable silver halide by means of a silver halide developing solution wherein the developing solution contains a silver halide developing agent and a derivative of a polyethylene glycol or a C 1 -C 5 monoalkyl ether thereof corresponding to the formula: R.sub.1 O(CH.sub.2 CH.sub.2 O).sub.n X--A--Y--R.sub.2 wherein R 1 is hydrogen, C 1 -C 5 alkyl or the group X--A--Y--R 2 n is an integer of at least 4 X is CO, SO 2 , CONH or, when R 1 is X--A--Y--R 2 may be a chemical monovalent bond, A is alkylene or arylene, Y is a sulphur or selenium atom, and R 2 is an alkyl group.
Claim 3
Dependent Claim
27 words
Method according to claim 1, wherein the derivative is present in the developing solution in an amount comprised between about 50 mg and 10 g per liter.
Claim 4
Dependent Claim
26 words
Method according to claim 1, wherein the developable silver halide has been formed by uniform reexposure of the previously image-wise exposed and black-and-white developed photographic element.
Claim 5
Dependent Claim
19 words
Method according to claim 1, wherein the development is a colour development by means of a colour developing composition.
Claim 6
Dependent Claim
36 words
Method according to claim 1, wherein the photographic element is a colour element of the type having incorporated colour couplers capable of coupling with the oxidation products of a colour developing agent to form dyestuff images.
Claim 7
Dependent Claim
46 words
Method according to claim 5, wherein the photographic colour element is a multicolour element comprising at least one blue-sensitive emulsion layer with yellow-forming colour coupler, at least one green-sensitized emulsion layer with magenta-forming colour coupler and at least one red-sensitized emulsion layer with cyan-forming colour coupler.
Claim 8
Dependent Claim
96 words
A photographic developer comprising a silver halide developing agent and a derivative of a polyethylene glycol or a mono C 1 -C 5 alkylether thereof corresponding to the formula: R.sub.1 O(CH.sub.2 CH.sub.2 O).sub.n X--A--Y--R.sub.2 wherein R 1 is hydrogen, C 1 -C 5 alkyl or the group X--A--Y--R 2 n is an integer of at least 4 X is CO, SO 2 , CONH or, when R 1 is X--A--Y--R 2 may be a chemical monovalent bond, A is alkylene or arylene, Y is a sulphur or selenium atom, and R 2 is an alkyl group.
Claim 9
Dependent Claim
96 words
A photographic developer comprising a silver halide developing agent and a derivative of a polyethylene glycol or a mono C 1 -C 5 alkylether thereof corresponding to the formula: R.sub.1 O(CH.sub.2 CH.sub.2 O).sub.n X--A--Y--R.sub.2 wherein R 1 is hydrogen, C 1 -C 5 alkyl or the group X--A--Y--R 2 n is an integer of at least 4 X is CO, SO 2 , CONH or, when R 1 is X--A--Y--R 2 may be a chemical monovalent bond, A is alkylene or arylene, Y is a sulphur or selenium atom, and R 2 is an alkyl group.
Claim 10
Dependent Claim
26 words
A photographic developer according to claim 7, wherein the derivative is present in an amount comprised between about 50 mg and about 10 g per liter.
Claim 11
Dependent Claim
19 words
A photographic developer according to claim 7, wherein the developing agent is an aromatic primary amino colour developing agent.
Claim 12
Dependent Claim
18 words
A photographic developer according to claim 9, wherein the developing agent is a p-phenylene diamine colour developing agent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |