Patent US5379337A successfully refreshed from Google Patents.
US4090085A
Expired / Lapsed
US
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Intensifying screen for radiographs
Assignee: Dai Nippon Toryo Co Ltd
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Filing: 1976-08-23
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Granted: 1978-05-16
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Expires: 1996-08-23
Abstract
Abstract In an intensifying screen composed of a support layer, a phosphor layer and a protective layer or of a support layer, a reflective layer, a phosphor layer and a protective layer, a carbon black layer is interposed between the support layer and the phosphor layer or the reflective layer. Further, antistatic agents are mingled in the protective layer.
Inventors
- 👤 Keiji Shimiya
- 👤 Norio Miura
- 👤 Masao Takano
- 👤 Kunio Ishigaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:53
CPC Classifications
G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
An intensifying screen for radiographs comprising a support layer, a phosphor layer carried on said support layer and a protective layer applied on said phosphor layer, wherein the improvement comprising a carbon black layer interposed between said support layer and said phosphor layer, and antistatic agents mingled in said protective layer, said carbon black layer absorbing light generated in said phosphor layer to enhance image definition and assisting the antistatic agent containing protective layer to discharge static charge which tends to form on said protective layer.
Claim 2
Dependent Claim
86 words
An intensifying screen for radiographs comprising a support layer, a phosphor layer carried on said support layer and a protective layer applied on said phosphor layer, wherein the improvement comprising a carbon black layer interposed between said support layer and said phosphor layer, and antistatic agents mingled in said protective layer, said carbon black layer absorbing light generated in said phosphor layer to enhance image definition and assisting the antistatic agent containing protective layer to discharge static charge which tends to form on said protective layer.
Claim 3
Dependent Claim
22 words
An intensifying screen for radiographs as defined in claim 1 wherein said carbon black layer has a thickness of 0.005 to 0.05mm.
Claim 4
Dependent Claim
33 words
An intensifying screen for radiographs as defined in claim 1 wherein said carbon black layer is comprised of carbon black and binder resin mixed in the ratio of 1:1 or 1:2 by weight.
Claim 5
Dependent Claim
37 words
An intensifying screen for radiographs as defined in claim 1 wherein said antistatic agents are surface active agents, the mixing ratio thereof with respect to a protective film constituting the protective layer being from 0.0005 to 0.005.
Claim 6
Dependent Claim
21 words
An intensifying screeen for radiographs as defined in claim 1 wherein said protective layer has a thickness of about 10 microns.
Claim 7
Dependent Claim
93 words
An intensifying screen for radiographs comprising a support layer, a reflective layer carried on said support layer, a phosphor layer carried on said reflective layer, and a protective layer applied on said phosphor layer, wherein the improvement comprising a carbon black layer interposed between said support layer and said reflective layer, and antistatic agents mingled in said protective layer, said reflective layer reflecting light generated in said phosphor layer and said carbon black layer assisting the antistatic agent containing protective layer to discharge static charge which tends to form on said protective layer.
Claim 8
Dependent Claim
93 words
An intensifying screen for radiographs comprising a support layer, a reflective layer carried on said support layer, a phosphor layer carried on said reflective layer, and a protective layer applied on said phosphor layer, wherein the improvement comprising a carbon black layer interposed between said support layer and said reflective layer, and antistatic agents mingled in said protective layer, said reflective layer reflecting light generated in said phosphor layer and said carbon black layer assisting the antistatic agent containing protective layer to discharge static charge which tends to form on said protective layer.
Claim 9
Dependent Claim
22 words
An intensifying screen for radiographs as defined in claim 6 wherein said carbon black layer has a thickness of 0.005 to 0.05mm.
Claim 10
Dependent Claim
33 words
An intensifying screen for radiographs as defined in claim 6 wherein said carbon black layer is comprised of carbon black and binder resin mixed in the ratio of 1:1 or 1:2 by weight.
Claim 11
Dependent Claim
37 words
An intensifying screen for radiographs as defined in claim 6 wherein said antistatic agents are surface active agents, the mixing ratio thereof with respect to a protective film constituting the protective layer being from 0.0005 to 0.005.
Claim 12
Dependent Claim
21 words
An intensifying screen for radiographs as defined in claim 6 wherein said protective layer has a thickness of about 10 microns.
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) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |