US4704538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiographic intensifying screen
Assignee: Fujifilm Holdings Corp
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Filing: 1986-04-21
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Granted: 1987-11-03
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Expires: 2006-04-21
Abstract
Abstract A radiographic intensifying screen comprising a support, phosphor layers provided thereon which comprise a binder and phosphor particles dispersed therein, and a protective film provided on said phosphor layers, in which said phosphor layers comprise: (i) the first phosphor layer provided on said support containing at least one terbium activated rare earth oxysulfide phosphor; and (ii) the second phosphor layer provided on the first phosphor layer containing at least one divalent europium activated barium fluorohalide phosphor.
Inventors
- 👤 Akira Kitada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:39
CPC Classifications
G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
A radiographic intensifying screen comprising a support, phosphor layers provided thereon which comprise a binder and phosphor particles dispersed therein, and a protective film provided on said phosphor layers, in which said phosphor layers comprise: (i) a first phosphor layer provided on said support comprising terbium activated rare earth oxysulfide phosphor; and (ii) a second phosphor layer provided on the first phosphor layer comprising divalent europium activated barium fluorohalide phosphor, a ratio between the phosphor of the first layer and the phosphor of the second layer being within the range of 5:1 to 1:1, by weight.
Claim 2
Dependent Claim
96 words
A radiographic intensifying screen comprising a support, phosphor layers provided thereon which comprise a binder and phosphor particles dispersed therein, and a protective film provided on said phosphor layers, in which said phosphor layers comprise: (i) a first phosphor layer provided on said support comprising terbium activated rare earth oxysulfide phosphor; and (ii) a second phosphor layer provided on the first phosphor layer comprising divalent europium activated barium fluorohalide phosphor, a ratio between the phosphor of the first layer and the phosphor of the second layer being within the range of 5:1 to 1:1, by weight.
Claim 3
Dependent Claim
31 words
The radiographic intensifying screen as claimed in claim 1, in which each of said first phosphor layer and said second phosphor layer has a thickness within the range of 20-200 μm.
Claim 4
Dependent Claim
24 words
The radiographic intensifying screen as claimed in claim 1 or claim 2, in which the protective film is made of a polyethylene terephthalate film.
Claim 5
Dependent Claim
26 words
The radiographic intensifying screen as claimed in claim 1, wherein the thickness of the first phosphor layer is larger than that of the second phosphor layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |