US4444871A
Expired / Lapsed
US
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Method for forming a direct positive color image
Assignee: Konica Minolta Inc
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Filing: 1982-09-30
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Granted: 1984-04-24
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Expires: 2002-09-30
Abstract
Abstract Method for forming a direct positive-color image in which an imagewise exposure is applied to a direct positive silver halide color photosensitive material comprising a support and at least one light-sensitive silver halide emulsion layer which contain internal latent image type silver halide grains whose surfaces are not fogged, said method including applying a fogging exposure and color development wherein said fogging exposure is applied in a wet condition with a solution containing at least one fluorescent whitening agent.
Inventors
- 👤 Kazuyoshi Miyaoka
- 👤 Shigeharu Koboshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:05
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/50; Y; Y10; Y10S; Y10S430/00; Y10S430/141
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
100 words
A method for forming a direct positive color image in which an imagewise exposure is applied to a direct positive silver halide color photosensitive material comprising a support and at least one light-sensitive silver halide emulsion layer selected from the group consisting of a blue-sensitive, a green-sensitive and a red-sensitive silver halide emulsion layers containing respectively internal latent image type silver halide grains whose surfaces are not fogged and a fogging exposure is then applied and further a color development is made, wherein said fogging exposure is applied in a wet condition with a solution containing a fluorescent whitening agent.
Claim 2
Independent Claim
100 words
A method for forming a direct positive color image in which an imagewise exposure is applied to a direct positive silver halide color photosensitive material comprising a support and at least one light-sensitive silver halide emulsion layer selected from the group consisting of a blue-sensitive, a green-sensitive and a red-sensitive silver halide emulsion layers containing respectively internal latent image type silver halide grains whose surfaces are not fogged and a fogging exposure is then applied and further a color development is made, wherein said fogging exposure is applied in a wet condition with a solution containing a fluorescent whitening agent.
Claim 3
Dependent Claim
31 words
A method according to claim 1, wherein said fluorescent whitening agent is one selected from the group consisting of stilbene compounds, coumalin compounds, biphenyl-compounds, azole compounds, naphthalimide compounds and pyrazoline compounds.
Claim 4
Dependent Claim
68 words
A method according to claim 2, wherein said stilbene compounds are represented by the Formula: ##STR11## Wherein Y 1 and Y 2 represent respectively ##STR12## group in which R 1 , R 2 and R 3 represent respectively a hydroxyl group, a halogen atom, a morpholino group, an alkoxy group, an aryloxy group, an alkyl group, an aryl group, an amino group, an alkylamino group, an arylamino group.
Claim 5
Dependent Claim
21 words
A method according to claim 1, wherein said fogging exposure is applied by exposing the entire surface of said photosensitive material.
Claim 6
Dependent Claim
92 words
A method according to claim 1, wherein said light-sensitive silver halide emulsion layer would give the density of 0.6 when the density of silver of said emulsion layer is 35 mg Ag/dm 2 and said emulsion layer provided on said support is developed without any exposure to light, with the surface developing liquid A mentioned below at 20° C. for ten minutes: ______________________________________
Surface Developing Liquid A:
______________________________________
Metol (p-methylamino- 2.5 g
phenol sulfate)
l-ascorbic acid 10 g
NaBO.sub.2.4H.sub.2 O 35 g
KBr 1 g
Add water to make 1 ltr.
______________________________________
Claim 7
Dependent Claim
135 words
A method according to claim 1, wherein said light-sensitive silver halide emulsion layer would give a maximum density which is at least 5 times, when exposed for a given time up to 1 second and then developed at 20° C. for 4 minutes with an internal developing liquid B mentioned below, as dense as that obtained when exposed to light under the same condition and is then developed with a surface developing liquid A: ______________________________________
Surface Developing Liquid A:
Metol (p-methylamino- 2.5 g
phenol sulfate)
l-ascorbic acid 10 g
NaBO.sub.2.4H.sub.2 O 35 g
KBr 1 g
Add water to make 1 ltr.
Internal Developing Liquid B:
Metol 2 g
Sodium sulfite, anhydrous
90 g
Hydroquinone 8 g
Sodium carbonate, monohydrate
52.5 g
KBr 5 g
KI 0.5 g
Add water to make 1 ltr.
______________________________________
References Cited (Backward Citations)
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US3779766A
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US3850638A
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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) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |