US4150993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming a direct positive image
Assignee: Konica Minolta Inc
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Filing: 1977-11-21
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Granted: 1979-04-24
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Expires: 1997-11-21
Abstract
Abstract A process for forming a direct positive image by developing, after imagewise exposure to an internal latent image type light-sensitive silver halide photographic material, with a surface developer for silver halide, which process comprises incorporating at least one fogging agent selected from hydrazine compounds, N-substituted cycloammonium salts and benzimidazole derivatives in combination with an amineborane compound into said light-sensitive silver halide photographic material, said surface developer and/or a treating bath used prior to the treatment by said surface developer.
Inventors
- 👤 Tsuneo Suga
- 👤 Keiji Ogi
- 👤 Kenji Egami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:06
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/50; G03C1/00; G03C1/005; G03C1/485; G03C1/48538; G03C1/48546
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A process for forming a direct positive image by developing, after imagewise exposure of an internal latent image type light-sensitive silver halide photographic material, with a surface developer for silver halide, which comprises incorporating at least one fogging agent selected from hydrazine compounds, N-substituted cycloammonium salts and benzimidazole derivatives in combination with an amineborane compound into said light-sensitive silver halide photographic material, said surface developer or a treating bath used prior to the treatment by said surface developer.
Claim 2
Dependent Claim
78 words
A process for forming a direct positive image by developing, after imagewise exposure of an internal latent image type light-sensitive silver halide photographic material, with a surface developer for silver halide, which comprises incorporating at least one fogging agent selected from hydrazine compounds, N-substituted cycloammonium salts and benzimidazole derivatives in combination with an amineborane compound into said light-sensitive silver halide photographic material, said surface developer or a treating bath used prior to the treatment by said surface developer.
Claim 3
Dependent Claim
32 words
The process for forming a direct positive image as claimed in claim 1 wherein said amineborane compound is represented by the formula: Z:BH.sub.3 wherein Z represents an alkylamine or a heterocyclic amine.
Claim 4
Dependent Claim
62 words
The process for forming a direct positive image as claimed in claim 2 wherein said alkylamine is represented by the formula: ##STR2## wherein R 1 represents an alkyl group having 1 to 20 carbon atoms or a hydroxyalkyl group; R 2 and R 3 each represent an alkyl group having 1 to 20 carbon atoms, a hydroxyalkyl group or a hydrogen atom.
Claim 5
Dependent Claim
19 words
The process as claimed in claim 2 wherein said cyclic amine is pyridine, picoline, lutidine, 2-ethylpyridine, 2,4-diethylpyridine or morpholine.
Claim 6
Dependent Claim
29 words
The process as claimed in claim 1 wherein said amineborane is used in an amount of 10 -5 to 10 -1 mole per one mole of the fogging agent.
Claim 7
Dependent Claim
36 words
The process as claimed in claim 1 wherein said fogging agent is incorporated into a light-sensitive silver halide photographic material in an amount of 50 mg to 5 g per one mole of the silver halide.
Claim 8
Dependent Claim
49 words
The process as claimed in claim 1 wherein said fogging agent is incorporated into a surface developer or a treating bath used prior to the treatment by the surface developer in an amount of 0.1 to 3 g per one liter of a surface developer or a treating bath.
References Cited (Backward Citations)
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US3850638A
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US4030925A
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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) | 1982-04-23 | 1982-10-23 | 1983-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-23 | 1986-10-23 | 1987-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-23 | 1990-10-23 | 1991-04-24 | $7700.00 | Window Closed / Lapsed |