US4731322A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive silver halide photographic material for X-ray photography
Assignee: Konica Minolta Inc
•
Filing: 1986-07-29
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Granted: 1988-03-15
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Expires: 2006-07-29
Abstract
Abstract A light-sensitive silver halide photographic material for X-ray photography characterized in that the material has the characteristic curve whose gamma between optical densities of 0.50 and 1.50 is 2.7 to 3.3 and gamma between optical densities of 2.00 and 3.00 is 1.5 to 2.5, when processed by use of the following developer: ______________________________________ Potassium sulfite 55.0 g Hydroquinone 25.0 g 1-Phenyl-3-pyrazolidone 1.2 g Boric acid 10.0 g Potassium hydroxide 21.0 g Triethylene glycol 17.5 g 5-Methylbenztriazole 0.04 g 5-Nitrobenzimidazole 0.11 g 1-Phenyl-5-mercaptotetrazole 0.015 g Glacial acetic acid 16.0 g Potassium bromide 4.0 g Add water to make up one liter. ______________________________________
Inventors
- 👤 Akio Suzuki
- 👤 Masatoshi Iwata
- 👤 Katsutoshi Machida
- 👤 Chika Honda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:32
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C5/00; G03C5/16; G03C2200/00; G03C2200/58; Y; Y10; Y10S; Y10S430/00; Y10S430/167; Y10S430/168
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
A method for preparing a light-sensitive silver halide photographic material for X-ray photography comprising chemically sensitizing a monodispersed silver halide emulsion and chemically sensitizing a polydispersed silver halide emulsion, said monodispersed emulsion containing grains of a larger mean grain size than the grains of said polydispersed emulsion and then mixing said monodispersed emulsion with said polydispersed emulsion, the mean grain sizes of said polydispersed emulsion and said monodispersed emulsion are from 0.3 to 1.35 μm and the ratio of the former to the latter is 1:1.2 to 1:2.4, thereby preparing a light-sensitive silver halide photographic material having a characteristic curve whose gamma between optical densities of 0.50 and 1.50 is 2.7 to 3.3 and gamma between optical densities of 2.00 and 3.00 is 1.5 to 2.5 when processed by the following Developer-I: ______________________________________
Potassium sulfite 55.0 g
Hydroquinone 25.0 g
1-Phenyl-3-pyrazolidone 1.2 g
Boric acid 10.0 g
Potassium hydroxide 21.0 g
Triethylene glycol 17.5 g
5-Methylbenztriazole 0.04 g
5-Nitrobenzimidazole 0.11 g
1-Phenyl-5-mercaptotetrazole
0.015 g
Glacial acetic acid 16.0 g
Potassium bromide 4.0 g
Water to make up one liter.
______________________________________
Claim 2
Independent Claim
180 words
A method for preparing a light-sensitive silver halide photographic material for X-ray photography comprising chemically sensitizing a monodispersed silver halide emulsion and chemically sensitizing a polydispersed silver halide emulsion, said monodispersed emulsion containing grains of a larger mean grain size than the grains of said polydispersed emulsion and then mixing said monodispersed emulsion with said polydispersed emulsion, the mean grain sizes of said polydispersed emulsion and said monodispersed emulsion are from 0.3 to 1.35 μm and the ratio of the former to the latter is 1:1.2 to 1:2.4, thereby preparing a light-sensitive silver halide photographic material having a characteristic curve whose gamma between optical densities of 0.50 and 1.50 is 2.7 to 3.3 and gamma between optical densities of 2.00 and 3.00 is 1.5 to 2.5 when processed by the following Developer-I: ______________________________________
Potassium sulfite 55.0 g
Hydroquinone 25.0 g
1-Phenyl-3-pyrazolidone 1.2 g
Boric acid 10.0 g
Potassium hydroxide 21.0 g
Triethylene glycol 17.5 g
5-Methylbenztriazole 0.04 g
5-Nitrobenzimidazole 0.11 g
1-Phenyl-5-mercaptotetrazole
0.015 g
Glacial acetic acid 16.0 g
Potassium bromide 4.0 g
Water to make up one liter.
______________________________________
Claim 3
Dependent Claim
30 words
The method of claim 1, wherein the sensitized monodispersed emulsion and the sensitized polydispersed emulsion are mixed in the ratio of 2:1 to 5:1 as molar ratio of silver halide.
Claim 4
Dependent Claim
30 words
The method of claim 2, wherein the sensitized monodispersed emulsion and the sensitized polydispersed emulsion are mixed in the ratio of 3:1 to 4:1 as molar ratio of silver halide.
Claim 5
Independent Claim
162 words
A method for preparing a light-sensitive silver halide photographic material for X-ray photography comprising chemically sensitizing a monodispersed silver halide emulsion of a mean grain size of 1.15 to 1.35 μm and chemically sensitizing a polydispersed silver halide emulsion of a mean grain size of 0.55 to 0.75 μm, and mixing said sensitized monodispersed emulsion with said polydispersed emulsion in the ratio of 3:1 to 4:1 as molar ratio of silver halide, thereby preparing a light-sensitive silver halide photographic material whose gamma between optical densities of 0.50 and 1.50 is 2.7 to 3.3 and gamma between optical densities of 2.00 and 3.00 is 1.5 to 2.5, when processed by use of the following Developer-I: ______________________________________
Potassium sulfite 55.0 g
Hydroquinone 25.0 g
1-Phenyl-3-pyrazolidone 1.2 g
Boric acid 10.0 g
Potassium hydroxide 21.0 g
Triethylene glycol 17.5 g
5-Methylbenztriazole 0.04 g
5-Nitrobenzimidazole 0.11 g
1-Phenyl-5-mercaptotetrazole
0.015 g
Glacial acetic acid 16.0 g
Potassium bromide 4.0 g
Water to make up one liter.
______________________________________
Claim 6
Independent Claim
162 words
A method for preparing a light-sensitive silver halide photographic material for X-ray photography comprising chemically sensitizing a monodispersed silver halide emulsion of a mean grain size of 1.15 to 1.35 μm and chemically sensitizing a polydispersed silver halide emulsion of a mean grain size of 0.55 to 0.75 μm, and mixing said sensitized monodispersed emulsion with said polydispersed emulsion in the ratio of 3:1 to 4:1 as molar ratio of silver halide, thereby preparing a light-sensitive silver halide photographic material whose gamma between optical densities of 0.50 and 1.50 is 2.7 to 3.3 and gamma between optical densities of 2.00 and 3.00 is 1.5 to 2.5, when processed by use of the following Developer-I: ______________________________________
Potassium sulfite 55.0 g
Hydroquinone 25.0 g
1-Phenyl-3-pyrazolidone 1.2 g
Boric acid 10.0 g
Potassium hydroxide 21.0 g
Triethylene glycol 17.5 g
5-Methylbenztriazole 0.04 g
5-Nitrobenzimidazole 0.11 g
1-Phenyl-5-mercaptotetrazole
0.015 g
Glacial acetic acid 16.0 g
Potassium bromide 4.0 g
Water to make up one liter.
______________________________________
Claim 7
Dependent Claim
43 words
The light-sensitive silver halide photographic material for X-ray photography prepared by the process of claim 4 which has wide exposure latitude at the high density portion of said exposure and is capable of producing images of high sharpness which have high diagnostic utility.
Claim 8
Dependent Claim
35 words
The method of X-ray photography comprising imagewise exposing the light-sensitive silver halide photographic material of claim 5 to X-ray radiation to expose said material and then developing said exposed material to produce sharp photographic images.
References Cited (Backward Citations)
US3942986A
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US3989527A
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US4222777A
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US4446228A
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US4414304A
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US4521507A
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US4425426A
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US4425426B1
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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) | 1991-03-15 | 1991-09-14 | 1992-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-15 | 1995-09-14 | 1996-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-15 | 1999-09-14 | 2000-03-15 | $7700.00 | Window Closed / Lapsed |