US3717764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intensifying screen for radiograph use
Assignee: Fujifilm Holdings Corp
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Filing: 1970-03-05
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Granted: 1973-02-20
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Expires: 1990-03-05
Abstract
Abstract Disclosed is an intensifying screen for X-ray radiograph use having a striped or checkered pattern of metal strips embedded in a high-sensitive phosphor layer, thereby reducing ''''mottles'''' which are offensive to the eye in examining an X-ray picture and at the same time absorbing the scattered X-ray in the screen. The combined effects of reduction of ''''mottles'''' and absorption of scattered X-rays improve the image quality of an X-ray picture.
Inventors
- 👤 I Fujimura
- 👤 M Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:38
CPC Classifications
G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
134 words
An intensifying screen for radiograph use comprising a support, a layer of finely divided luminescent crystals deposited on said support and metal dividing means dividing said luminescent layer into a plurality of separated sections, said metal dividing means comprising a plurality of metal strips disposed in the luminescent layer, said metal strips having a longitudinal dimension TM and a width WM, the sections of said luminescent layer having a longitudinal dimension TI and a width WI, the aforementioned dimensions being within the following ranges: TM : 10 - 300 Mu WM : 5 - 200 Mu TI : 10 - 300 Mu WI : 10 - 200 Mu thereby dividing an image of agglomeration of luminescent crystal grains into small sections which are not offensive to the eye of an observer examining the radiograph.
Claim 2
Dependent Claim
134 words
An intensifying screen for radiograph use comprising a support, a layer of finely divided luminescent crystals deposited on said support and metal dividing means dividing said luminescent layer into a plurality of separated sections, said metal dividing means comprising a plurality of metal strips disposed in the luminescent layer, said metal strips having a longitudinal dimension TM and a width WM, the sections of said luminescent layer having a longitudinal dimension TI and a width WI, the aforementioned dimensions being within the following ranges: TM : 10 - 300 Mu WM : 5 - 200 Mu TI : 10 - 300 Mu WI : 10 - 200 Mu thereby dividing an image of agglomeration of luminescent crystal grains into small sections which are not offensive to the eye of an observer examining the radiograph.
Claim 3
Dependent Claim
27 words
An intensifying screen according to claim 1, wherein said metal dividing means comprise a plurality of metal strips embedded in the luminescent layer in a striped pattern.
Claim 4
Dependent Claim
27 words
An intensifying screen according to claim 1, wherein said metal dividing means comprise a plurality of metal strips embedded in the luminescent layer in a checkered pattern.
Claim 5
Dependent Claim
22 words
An intensifying screen according to claim 1, wherein said metal dividing means comprise a perforated metal foil embedded in the luminescent layer.
Claim 6
Dependent Claim
24 words
An intensifying screen according to claim 1, further comprising a light reflecting layer provided on said support between said carrier and said luminescent layer.
Claim 7
Dependent Claim
24 words
An intensifying screen according to claim 1, further comprising a light absorbing layer provided on said support between said support and said luminescent layer.
Claim 8
Dependent Claim
21 words
An intensifying screen according to claim 1, wherein said metal dividing means comprise metal strips which are rectangular in cross section.
Claim 9
Dependent Claim
21 words
An intensifying screen according to claim 1, wherein said metal dividing means comprise metal strips which are trapezoidal in cross section.
Claim 10
Dependent Claim
21 words
An intensifying screen according to claim 1, wherein said metal dividing means comprise metal strips which are corrugated in cross section.
Claim 11
Dependent Claim
25 words
An intensifying screen according to claim 1, wherein said metal dividing means comprise metal strips embedded flush with the upper surface of said luminescent layer.
Claim 12
Dependent Claim
31 words
An intensifying screen according to claim 1, in which said luminescent layer comprising a lamination of an upper layer of finely divided crystals and a lower layer of coarsely divided crystals.
Claim 13
Dependent Claim
22 words
An intensifying screen according to claim 1, in which said luminescent layer comprising a layer of a mixture of different luminescent materials.
Claim 14
Dependent Claim
18 words
An intensifying screen according to claim 1, in which a protective coating is provided on the luminescent layer.
Claim 15
Dependent Claim
29 words
An intensifying screen according to claim 13, in which the protective coating is made of a member selected from the group consisting of gelatine, polyvinyl alcohol or cellulose triacetate.
Claim 16
Dependent Claim
24 words
An intensifying screen according to claim 14, in which the thickness of the protective coating is within the range from 1 to 10 microns.
Claim 17
Dependent Claim
93 words
An intensifying screen for radiograph use comprising a support, a layer of finely divided luminescent crystals deposited on such support, metal dividing means dividing said luminescent layers into a plurality of separated sections, and a metal coating provided on said metal dividing means, the atomic number of the metal coating being larger than that of the metal dividing means, said sections being of a size small enough to divide an image of agglomeration of luminescent crystal grains into small sections which are not offensive to the eye of an observer examining the radiograph.
Claim 18
Dependent Claim
93 words
An intensifying screen for radiograph use comprising a support, a layer of finely divided luminescent crystals deposited on such support, metal dividing means dividing said luminescent layers into a plurality of separated sections, and a metal coating provided on said metal dividing means, the atomic number of the metal coating being larger than that of the metal dividing means, said sections being of a size small enough to divide an image of agglomeration of luminescent crystal grains into small sections which are not offensive to the eye of an observer examining the radiograph.
References Cited (Backward Citations)
US2459693A
Cited
US3089956A
Cited
US2827571A
Cited
US2975966A
Cited
US2829264A
Cited
US3041456A
Cited
US3043710A
Cited
US3344276A
Cited
US3504212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |