Patent US3591802A successfully refreshed from Google Patents.
US3591802A
Expired / Lapsed
US
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Method of making a color radiograph, and a fluorescent screen and light sensitive material used therefor
Assignee: Fujifilm Holdings Corp
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Filing: 1966-05-16
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Granted: 1971-07-06
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Expires: 1986-05-16
Abstract
Abstract A fluorescent screen for producing improved color radiographs comprising at least two color filter materials having different spectroscopic characteristics and a fluorescent material associated with the filter material, the filter materials being interposed between the fluorescent material and the film on which the radiograph will be produced. By passing radiation through an object and impinging the radiation on the fluorescent material, it is caused to fluoresce. The fluorescent material is correlated with the filters so that each filter passes radiation in a separate nonoverlapping portion of the spectrum. The filtered radiation is then passed onto the photographic color film.
Inventors
- 👤 Mataichi Tajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:00
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/16; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
47 words
The method of claim 1 wherein said color filter materials are coated on the surface of said first body of fluorescent material and said second body of fluorescent material, said color filter materials being on the side of said fluorescent bodies adjacent the emulsions of said film.
Claim 2
Dependent Claim
40 words
The method of claim 2 wherein said bodies of fluorescent material contain different fluorescent materials and are positioned on both sides of said film, each of said sides of said film containing one of said at least two emulsions thereon.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein said fluorescent material comprises a layer containing discrete particles of fluorescent material and said color filter material is coated on the surfaces of the particles.
Claim 4
Dependent Claim
32 words
The method of claim 1 wherein said fluorescent material comprises a layer comprising discrete particles of fluorescent material dispersed in a binder and said color filter material is incorporated in said binder.
Claim 5
Dependent Claim
95 words
The method of claim 1 which further comprises, after exposing said individual emulsions, filtering the fluorescent radiation which exposes said emulsions so as to substantially completely prohibit radiation from striking a second photographic emulsion which will expose said second photographic emulsion, said filtering being accomplished by providing further color filter layers in conjunction with said individual emulsion layers, said further color filter layers and said emulsion layers being correlated so that said fluorescent radiation originating from said fluorescent materials strikes said emulsion layer which said fluorescent radiation exposes prior to striking said further filter layer.
Claim 6
Dependent Claim
133 words
A fluorescent screen assembly with at least two spaced, facing support members for producing an improved color radiograph comprising at least two color filter materials having different spectroscopic characteristics, said color filter materials facing and spaced from each other, at least one of said color filter materials being on a separate support member from other filter materials, and at least two different fluorescent materials, said individual filter materials being correlated with said individual fluorescent materials on separate support members so that each filter-fluorescent material combination passes radiation in a nonoverlapping portion of the spectrum with respect to the other filter-flourescent material combinations, said color filter materials being interposed between said fluorescent materials and the film on which said radiograph is to be produced, said film being inserted between said spaced, facing support members.
Claim 7
Dependent Claim
48 words
A fluorescent screen assembly as in claim 7 wherein said film comprises at least two emulsion layers and at least two color filter layers, said individual emulsion layers first being contacted with radiation which exposes said emulsion layers prior to said filter layers being contacted with said radiation.
Claim 8
Dependent Claim
54 words
A fluorescent screen for producing an improved color radiograph comprising a layer containing particles of fluorescent material enveloped in coating of at least two different color filter materials, said individual filter materials being correlated with said fluorescent material so that each filter-fluorescent material combination passes radiation in a different nonoverlapping portion of the spectrum.
Claim 9
Dependent Claim
20 words
A fluorescent screen as described in claim 9 wherein said color filter materials are in a binder enveloping said particles.
References Cited (Backward Citations)
US2434019A
Cited
US2807725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |