US4491620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible, nonstaining topcoat for an X-ray intensifying screen
Assignee: EIDP Inc
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Filing: 1982-09-20
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Granted: 1985-01-01
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Expires: 2002-09-20
Abstract
Abstract A topcoat or abrasion layer useful for protecting an X-ray intensifying screen comprising a copolymer of a fluoroester and methylmethacrylate. This topcoat is flexible, adhesive, and nonstaining and permits the use of the X-ray screen in the modern, rapid changer systems.
Inventors
- 👤 James R. Joiner, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
G; G21; G21K; G21K4/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31681; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
An X-ray image intensifying screen comprising, in order, a support, an active layer on said support comprising fluoroescent phosphor particles dispersed in a film-forming binder, and a protective topcoat on said active layer, characterized in that said topcoat is a flexible film composed of a copolymer of (1) a fluoroester of the formula: ##STR4## wherein n is an integer from 2 to 9, and (2) methylmethacrylate.
Claim 2
Dependent Claim
66 words
An X-ray image intensifying screen comprising, in order, a support, an active layer on said support comprising fluoroescent phosphor particles dispersed in a film-forming binder, and a protective topcoat on said active layer, characterized in that said topcoat is a flexible film composed of a copolymer of (1) a fluoroester of the formula: ##STR4## wherein n is an integer from 2 to 9, and (2) methylmethacrylate.
Claim 3
Dependent Claim
13 words
The intensifying screen of claim 1 where n is an integer from 3-5.
Claim 4
Dependent Claim
20 words
The intensifying screen of claim 1 wherein the copolymer is prepared from a mixture of 80% fluoroester and 20% methylmethacrylate.
Claim 5
Dependent Claim
16 words
The intensifying screen of claim 1 wherein the support is a biaxially oriented polyethylene terephthalate film.
Claim 6
Dependent Claim
13 words
The intensifying screen of claim 1 wherein the film-forming binder is polyvinyl butyral.
Claim 7
Dependent Claim
18 words
The intensifying screen of claim 1 wherein the phosphor particles are composed of lanthanum oxybromide activated with thulium.
Claim 8
Dependent Claim
17 words
The intensifying screen of claim 1 wherein the protective topcoat is coated from an acetone/fluorocarbon solvent solution.
Claim 9
Dependent Claim
19 words
The intensifying screen of claim 1 wherein a light-reflecting layer is present between the active layer and its support.
Claim 10
Dependent Claim
13 words
The intensifying screen of claim 1 in combination with a photosensitive X-ray film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |