US4362944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiographic intensifying screen
Assignee: Mitsubishi Chemical Corp
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Filing: 1981-03-10
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Granted: 1982-12-07
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Expires: 2001-03-10
Abstract
Abstract In an intensifying screen composed of a support, a fluorescent layer disposed on the support and a protective layer disposed on the fluorescent layer, the fluorescent layer is composed of one or more phosphors selected from the group consisting of a terbium activated rare earth oxysulfide phosphor, a divalent europium activated alkali earth metal fluorohalide phosphor and a silver activated sulfide phosphor, and the protective layer is a light absorption layer which absorbs a part of light emitted by the fluorescent layer.
Inventors
- 👤 Yujiro Suzuki
- 👤 Norio Mirua
- 👤 Keiji Shimiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:32
CPC Classifications
G; G21; G21K; G21K4/00; G03; G03C; G03C5/00; G03C5/16; G03C5/17
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A radiographic intensifying screen composed of a support, a fluorescent layer and a protective layer disposed in this order wherein said protective layer has a fluorescent layer side surface adjacent the fluorescent layer and an outer surface oppositely disposed from the fluorescent layer side surface and said fluorescent layer comprises one or more phosphors selected from the group consisting of a terbium activated rare earth oxysulfide phosphor, a divalent europium activated alkali earth metal fluorohalide phosphor and a silver activated sulfide phosphor, wherein light absorption material has been coated onto or dyed into the portion of the protective layer adjacent the fluorescent layer side surface thereof where said light absorption material absorbs a part of the light emitted by said fluorescent layer and where the portion of the protective layer adjacent said outer surface thereof is free of said light absorption material.
Claim 2
Dependent Claim
142 words
A radiographic intensifying screen composed of a support, a fluorescent layer and a protective layer disposed in this order wherein said protective layer has a fluorescent layer side surface adjacent the fluorescent layer and an outer surface oppositely disposed from the fluorescent layer side surface and said fluorescent layer comprises one or more phosphors selected from the group consisting of a terbium activated rare earth oxysulfide phosphor, a divalent europium activated alkali earth metal fluorohalide phosphor and a silver activated sulfide phosphor, wherein light absorption material has been coated onto or dyed into the portion of the protective layer adjacent the fluorescent layer side surface thereof where said light absorption material absorbs a part of the light emitted by said fluorescent layer and where the portion of the protective layer adjacent said outer surface thereof is free of said light absorption material.
Claim 3
Dependent Claim
38 words
A radiographic intensifying screen as defined in claim 1 wherein said protective layer is a colored layer which comprises a transparent film and said light absorption material comprises a dye coated only on said fluorescent layer side surface.
Claim 4
Dependent Claim
18 words
A radiographic intensifying screen as defined in claim 2 wherein said transparent film is made of polyethylene terephthalate.
Claim 5
Dependent Claim
27 words
A radiographic intensifying screen as defined in claim 1 wherein the photographic sensitivity of the intensifying screen is within the range of 90% to 30% of that.
References Cited (Backward Citations)
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US3725704A
Cited
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |