Patent US4666774A successfully refreshed from Google Patents.
US4666774A
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Static resistant X-ray intensifying screens
Assignee: Sterling Diagnostic Imaging Inc
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Filing: 1985-03-01
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Granted: 1987-05-19
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Expires: 2005-03-01
Abstract
Abstract X-ray intensifying screen comprising, in order, support; fluorescent phosphor containing active layer; and protective topcoat which is a flexible film of a fluorine containing polymer, the topcoat being energy treated under oxidative condition, e.g., corona discharge, etc., and having an antistatic agent applied thereto, e.g., from a solution containing at least 0.1% by weight of an anionic, cationic, nonionic or amphoteric antistatic agent. The X-ray intensifying screens have improved resistance to static.
Inventors
- 👤 Theodore P. Christini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:30
CPC Classifications
G; G21; G21K; G21K4/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
60 words
An X-ray intensifying screen comprising, in order, a support, an active layer on the support comprising fluorescent phosphor particles dispersed in a film forming binder, a protective topcoat on the active layer which is a flexible film of a fluorine containing polymer, the improvement whereby the topcoat is energy treated under oxidative conditions and an antistatic agent is applied thereto.
Claim 2
Dependent Claim
60 words
An X-ray intensifying screen comprising, in order, a support, an active layer on the support comprising fluorescent phosphor particles dispersed in a film forming binder, a protective topcoat on the active layer which is a flexible film of a fluorine containing polymer, the improvement whereby the topcoat is energy treated under oxidative conditions and an antistatic agent is applied thereto.
Claim 3
Dependent Claim
25 words
An X-ray intensifying screen according to claim 1 wherein the antistatic agent is applied from a solution containing at least 0.1% by weight antistatic agent.
Claim 4
Dependent Claim
25 words
An X-ray intensifying screen according to claim 1 wherein the antistatic agent is applied from a solution containing 1 to 10% by weight antistatic agent.
Claim 5
Dependent Claim
39 words
An X-ray intensifying screen according to claim 1 wherein the protective topcoat is a flexible film of a copolymer of (1) a fluoroester of the formula: ##STR6## wherein n is an integer from 2 to 9, and (2) methylmethacrylate.
Claim 6
Dependent Claim
32 words
An X-ray intensifying screen according to claim 1 wherein the energy treatment under oxidative condition is a corona discharge treatment with energy/unit area (E/A) values in the range of 50 to 300.
Claim 7
Dependent Claim
24 words
An X-ray intensifying screen according to claim 1 wherein the energy treatment under oxidative condition is a high intensity ultraviolet generating source generating ozone.
Claim 8
Dependent Claim
49 words
An X-ray intensifying screen according to claim 1 wherein the energy treated topcoat has applied thereto an anionic antistat of mixed mono- and dialkyl phosphates of the general structure RH 2 PO 4 and R 2 HPO 4 , where R is alkyl of 8 to 10 carbon atoms.
Claim 9
Dependent Claim
28 words
An X-ray intensifying screen according to claim 1 wherein the energy treated topcoat has applied thereto a cationic antistat of a quaternary ammonium derivative of a fatty imidazoline.
Claim 10
Dependent Claim
23 words
An X-ray intensifying screen according to claim 1 wherein the energy treated topcoat has applied thereto a nonionic antistat of an ethoxylated amine.
Claim 11
Dependent Claim
23 words
An X-ray intensifying screen according to claim 1 wherein the protective topcoat is a flexible film of a short chain telomer of tetrafluoroethylene.
Claim 12
Dependent Claim
49 words
An X-ray intensifying screen according to claim 1 wherein the protective topcoat is a flexible film of a mixture of a short chain telomer of tetrafluoroethylene and a copolymer of (1) a fluoroester of the formula: ##STR7## wherein n is an integer from 2 to 9, and (2) methylmethacrylate.
Claim 13
Dependent Claim
23 words
An X-ray intensifying screen according to claim 1 wherein the protective topcoat is a flexible film of a copolymer of perfluorodimethyldioxole and tetrafluoroethylene.
Claim 14
Dependent Claim
20 words
An X-ray intensifying screen according to claim 1 wherein the antistat agent is applied in the absence of a solvent.
Claim 15
Dependent Claim
20 words
A pair of X-ray intensifying screens according to claim 1 in combination with a double side coated photosensitive X-ray film.
Claim 16
Dependent Claim
18 words
An X-ray intensifying screen according to claim 1 in combination with a single side coated 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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |