US4279987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive, direct positive silver halide photographic material
Assignee: Konica Minolta Inc
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Filing: 1979-11-13
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Granted: 1981-07-21
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Expires: 1999-11-13
Abstract
Abstract This invention relates to a light-sensitive, direct positive silver halide photographic material, more particularly to a light-sensitive silver halide photographic material of internal latent image type containing a novel, development-accelerating compound, as used for the formation of a direct positive image by imagewise exposure followed by overall light-exposure before and/or during development or development treatment in the presence of a fogging agent.
Inventors
- 👤 Keiji Ogi
- 👤 Takashi Sasaki
- 👤 Yasuo Tosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48538
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
A direct positive photographic material comprising a light-sensitive internal latent image type silver halide emulsion layer coated on a support, characterized by containing a compound of the general formula ##STR3## wherein R 1 , R 2 and R 3 which may be the same or different represent independently a hydrogen or halogen atom or a substituted or unsubstituted alkyl or aryl group, R 4 represents a hydrogen or halogen atom or a substituted or unsubstituted alkyl, alkoxy, acyl, amino, aryl, aryloxy, nitro, hydroxy, carboxy or alkoxycarbonyl group.
Claim 2
Dependent Claim
87 words
A direct positive photographic material comprising a light-sensitive internal latent image type silver halide emulsion layer coated on a support, characterized by containing a compound of the general formula ##STR3## wherein R 1 , R 2 and R 3 which may be the same or different represent independently a hydrogen or halogen atom or a substituted or unsubstituted alkyl or aryl group, R 4 represents a hydrogen or halogen atom or a substituted or unsubstituted alkyl, alkoxy, acyl, amino, aryl, aryloxy, nitro, hydroxy, carboxy or alkoxycarbonyl group.
Claim 3
Dependent Claim
21 words
A direct positive photographic material according to claim 1 wherein R 1 , R 2 and R 3 represent hydrogen atoms.
Claim 4
Dependent Claim
33 words
A direct positive photographic material according to claim 1 wherein R 1 and R 2 individually represent a hydrogen atom or a lower alkyl group having a carbon atom number 1 to 4.
Claim 5
Dependent Claim
22 words
A direct positive photographic material according to claim 1 wherein R 4 represents a hydrogen atom or an alkyl or alkoxy group.
Claim 6
Dependent Claim
18 words
A direct positive photographic material according to claim 4 wherein R 4 is connected at a para position.
Claim 7
Dependent Claim
18 words
A direct positive photographic material according to claim 1 wherein the compound is represented by following formula; ##STR4##
Claim 8
Dependent Claim
25 words
A direct positive photographic material according to claim 1 wherein the compound is included in a light-sensitive internal latent image type silver halide emulsion layer.
Claim 9
Dependent Claim
23 words
A direct positive photographic material according to claim 7 wherein an amount of the compound is 0.001-1 mol per mol of silver halide.
Claim 10
Dependent Claim
29 words
A direct positive photographic material according to claim 1 wherein the compound is included in a layer adjacent to the light-sensitive internal latent image type silver halide emulsion layer.
Claim 11
Dependent Claim
21 words
A direct positive photographic material according to claim 1, wherein the material comtains a cyan, magenta and yellow dye forming couplers.
Claim 12
Dependent Claim
129 words
A process for forming a direct positive image comprising the steps of: (a) imagewise exposing a photographic material comprising a light-sensitive internal latent image type silver halide emulsion layer coated on a support; and (b) (i) overall light-exposing said photographic material before and/or during development or (ii) developing said photographic material in the presence of a fogging agent, wherein said photographic material contains a compound of the general formula ##STR5## wherein R 1 , R 2 , and R 3 which may be the same or different and represent independently a hydrogen or halogen atom or a substituted or unsubstituted alkyl or aryl group, R 4 represents a hydrogen or halogen atom or a substituted or unsubstituted alkyl, alkoxy, acyl, amino, aryl, aryloxy, nitro, hydroxy, carboxy or alkoxycarbonyl group.
Claim 13
Dependent Claim
129 words
A process for forming a direct positive image comprising the steps of: (a) imagewise exposing a photographic material comprising a light-sensitive internal latent image type silver halide emulsion layer coated on a support; and (b) (i) overall light-exposing said photographic material before and/or during development or (ii) developing said photographic material in the presence of a fogging agent, wherein said photographic material contains a compound of the general formula ##STR5## wherein R 1 , R 2 , and R 3 which may be the same or different and represent independently a hydrogen or halogen atom or a substituted or unsubstituted alkyl or aryl group, R 4 represents a hydrogen or halogen atom or a substituted or unsubstituted alkyl, alkoxy, acyl, amino, aryl, aryloxy, nitro, hydroxy, carboxy or alkoxycarbonyl group.
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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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |