US4003746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic heterocyclic and thioaryl phosphines in silver halide emulsions and developers therefor
Assignee: EIDP Inc
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Filing: 1975-07-01
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Granted: 1977-01-18
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Expires: 1995-07-01
Abstract
Abstract Photographic elements comprising a silver halide emulsion layer give less fog in negative type emulsions and increased speed in direct-positive emulsions when said emulsions are developed in the presence of an organic heterocyclic or thioaryl-substituted tertiary phosphine.
Inventors
- 👤 John Howard Bigelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:55
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; Y; Y10; Y10S; Y10S430/00; Y10S430/141; Y10S430/15
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A light-sensitive silver halide photographic material comprising a support bearing a layer of a silver halide emulsion containing in said layer or in a contiguous layer a tertiary phosphine of the formula PR 3 wherein at least one R but not more than 2 R's being the same, is a member of the groups ##STR9##and any remaining one R, or 2 R's being the same, is selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, and aralkyl.
Claim 2
Dependent Claim
78 words
A light-sensitive silver halide photographic material comprising a support bearing a layer of a silver halide emulsion containing in said layer or in a contiguous layer a tertiary phosphine of the formula PR 3 wherein at least one R but not more than 2 R's being the same, is a member of the groups ##STR9##and any remaining one R, or 2 R's being the same, is selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, and aralkyl.
Claim 3
Dependent Claim
16 words
The silver halide photographic material of claim 1 wherein one of the R groups is thiophenyl.
Claim 4
Dependent Claim
29 words
The silver halide photographic material of claim 1 wherein one R group is selected from the group consisting of piperidyl, pyrrolidyl, pyrryl, and 2 R's may consist of benzodioxa.
Claim 5
Dependent Claim
34 words
The silver halide photographic material of claim 1 wherein said phosphine compound is selected from the group consisting of dipyrryl-1-phenyl phosphine, diphenyl-1-pyrryl phosphine, diphenoxy-1-pyrrolidyl phosphine, diethoxy-1-pyrryl phosphine, dipyrrolidyl-1-phenyl phosphine, diphenyl-1-pyrrolidyl phosphine, and diphenyl--thiophenyl phosphine.
Claim 6
Dependent Claim
39 words
The silver halide photographic material of claim 4 wherein said tertiary phosphine compound is contained in the silver halide emulsion layer and has a concentration in the range of 0.005 to 0.5 grams per 1.5 moles of silver halide.
Claim 7
Dependent Claim
26 words
The silver halide photographic material of claim 1 wherein the silver halide emulsion is a gelatino-silver halide emulsion of the negative or fogged direct positive type.
Claim 8
Dependent Claim
15 words
The silver halide photographic material of claim 6 wherein said tertiary phosphine is diphenyl-1-thiphenyl phosphine.
Claim 9
Dependent Claim
89 words
A silver halide photographic developer solution which contains at least one silver halide developing agent and a tertiary phosphine of the formula PR 3 wherein at least one R, but not more than 2 R's being the same, is a member of the groups ##STR10##and any remaining R one R or 2 R's being the same is consist of selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, and aralkyl; said tertiary phosphine being present in an amount of 0.01 to 0.3 grams per liter of developer solution.
Claim 10
Dependent Claim
89 words
A silver halide photographic developer solution which contains at least one silver halide developing agent and a tertiary phosphine of the formula PR 3 wherein at least one R, but not more than 2 R's being the same, is a member of the groups ##STR10##and any remaining R one R or 2 R's being the same is consist of selected from the group consisting of alkyl, alkoxy, aryl, aryloxy, and aralkyl; said tertiary phosphine being present in an amount of 0.01 to 0.3 grams per liter of developer solution.
Claim 11
Dependent Claim
31 words
The silver halide photographic developer solution of claim 8 wherein said tertiary phosphine is selected from dipyrryl-1-phenyl phosphine, diphenyl-1-pyrryl phosphine, diphenoxy-1-pyrrolidyl phosphine diethoxy-1-pyrryl phosphine, dipyrrolidyl-1-phenyl phosphine diphenyl-1-pyrrolidyl phosphine, and diphenyl-1-thiophenyl phosphine.
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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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |