Patent US4059768A successfully refreshed from Google Patents.
US4059768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiographic intensifying screens
Assignee: Agfa Gevaert NV
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Filing: 1976-04-12
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Granted: 1977-11-22
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Expires: 1996-04-12
Abstract
Abstract Fluorescent X-ray image intensifying screen comprising discrete particles of fluorescent material dispersed in a binder layer which screen has an outer layer containing solid particulate material protruding from a coherent film forming organic binder medium and having a static friction coefficient at room temperature not higher than 0.30 on steel.
Inventors
- 👤 Willy Karel Van Landeghem
- 👤 Andre Roger Suys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:56
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/16; G03C5/17; G21; G21K; G21K4/00; Y; Y10; Y10S; Y10S430/00; Y10S430/167; Y10S430/168
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
53 words
Fluorescent X-ray image intensifying screen comprising discrete particles of fluorescent material dispersed in a binder layer which screen has an outermost layer overlaying said binder layer containing solid particulate material protruding from a coherent film-forming organic binder medium and having a static friction coefficient at room temperature not higher than 0.50 on steel.
Claim 2
Dependent Claim
53 words
Fluorescent X-ray image intensifying screen comprising discrete particles of fluorescent material dispersed in a binder layer which screen has an outermost layer overlaying said binder layer containing solid particulate material protruding from a coherent film-forming organic binder medium and having a static friction coefficient at room temperature not higher than 0.50 on steel.
Claim 3
Dependent Claim
20 words
The screen according to claim 1, wherein the said outermost layer is characterized by micro-unevennesses of at least 3 μm.
Claim 4
Dependent Claim
19 words
The screen according to claim 1, wherein said outermost layer exhibits at least 9 protruding particles per 0.25 sq.cm.
Claim 5
Dependent Claim
19 words
The screen according to claim 1, wherein the static friction coefficient of the protruding particles is less than 0.3.
Claim 6
Dependent Claim
30 words
The screen according to claim 1, wherein said protruding particles are made of a member of the group consisting of solid polystyrene, solid polyalkylene and a solid organic fluorinated polymer.
Claim 7
Dependent Claim
106 words
The screen according to claim 5, wherein the solid fluorinated polymer is characterized by the presence of repeating units of at least one of the following formulae: ##STR5## wherein: X represents a member of the group consisting of chlorine and fluorine, R represents a member selected from the group consisting of hydrogen and alkyl groups having 1 to about 4 carbon atoms, and Y represents a moiety having one of the following formulae: ##STR6## wherein n is 0 or 1 and R 1 is a fluorinated alkyl, including branched and straight chain alkyls as well as fluoroalkoxy-substituted fluorinated alkyls, having 1 to about 20 carbon atoms.
Claim 8
Dependent Claim
13 words
The screens according to claim 6, wherein the solid fluorinated polymer is polytetrafluoroethylene.
Claim 9
Dependent Claim
23 words
The screen according to claim 1, wherein the particulate material has an average particle size of between about 5 and about 25 μm.
Claim 10
Dependent Claim
33 words
The screen according to claim 1, wherein the particulate material is fixed with a film-forming binder resin of the group of cellulose nitrate, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate and polyamides.
Claim 11
Dependent Claim
28 words
The screen according to claim 9, wherein binder resin is present in said outermost layer in an amount varying from about 10 to about 95 percent by weight.
Claim 12
Dependent Claim
28 words
The screen according to claim 10, wherein the particulate material is present in the outermost layer in an amount from about 20 to about 50 percent by weight.
Claim 13
Dependent Claim
30 words
The screen according to claim 1, wherein the thickness of the coherent binder medium part of the dried outermost layer is less than the average diameter of the particulate material.
Claim 14
Dependent Claim
20 words
The screen according to claim 1, wherein the outermost layer is present on a fluorescent layer supported by a cardboard.
Claim 15
Dependent Claim
24 words
The screen according to claim 1, wherein the outermost layer is present on at least one side of a fluorescent layer that is self-supporting.
Claim 16
Dependent Claim
21 words
The screen according to claim 1, wherein the outermost layer is present on a fluorescent layer supported by a resin sheet.
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) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |