Patent US4490615A successfully refreshed from Google Patents.
US4490615A
Expired / Lapsed
US
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X-ray intensifying screen
Assignee: Radiographic Screen Oy
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Filing: 1981-10-30
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Granted: 1984-12-25
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Expires: 2001-10-30
Abstract
Abstract An X-ray intensifying screen is disclosed which is made of material that transforms X-rays into light and a suitable binding agent, the screen comprising a screen member having a surface with a plurality of spaced recesses for channelling the light toward specific areas of the film and to prevent uncontrolled diffusion and scattering of the light generated by the X-rays.
Inventors
- 👤 Esko Riihimaki
- 👤 Ossi Korhola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:41
CPC Classifications
G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
An X-ray intensifying screen for transforming X-rays into light to aid in the exposure of X-ray film, consisting essentially of: a planar screen member made of a homogeneous mixture of material which transforms X-rays into light rays and a binding agent, said screen member having a first plane surface and a second surface adapted to face the X-ray film, said second surface including a plurality of spaced shaped recesses therein adapted to be filled only with air, said recesses converging from a widest point adjacent said second surface so that the light rays are guided toward the X-ray film, said material which transforms X-rays being chosen from the group consisting of calcium tungstate, barium and phosphors containing rare earth metal, and said binding agent chosen from the group consisting of polyethylene, silicone compounds, acrylic plastic, polytetrafluoroethylene and cast plastic, the width of said screen being 0.1 to 4.00 mm and the diameter of said recesses being 0.01 to 0.5 mm.
Claim 2
Dependent Claim
160 words
An X-ray intensifying screen for transforming X-rays into light to aid in the exposure of X-ray film, consisting essentially of: a planar screen member made of a homogeneous mixture of material which transforms X-rays into light rays and a binding agent, said screen member having a first plane surface and a second surface adapted to face the X-ray film, said second surface including a plurality of spaced shaped recesses therein adapted to be filled only with air, said recesses converging from a widest point adjacent said second surface so that the light rays are guided toward the X-ray film, said material which transforms X-rays being chosen from the group consisting of calcium tungstate, barium and phosphors containing rare earth metal, and said binding agent chosen from the group consisting of polyethylene, silicone compounds, acrylic plastic, polytetrafluoroethylene and cast plastic, the width of said screen being 0.1 to 4.00 mm and the diameter of said recesses being 0.01 to 0.5 mm.
Claim 3
Dependent Claim
103 words
An X-ray intensifying screen manufactured of a material for transforming X-rays into light and of a binding agent, consisting essentially of the intensifying screen (1) being made of a homogeneous mixture of the material and the binding agent, the screen having the surface (2) adapted to be placed against X-ray film, and having gaps (5) adapted to be filled only with air for guiding light toward the X-ray film, the material being chosen from the group consisting of calcium tungstate, barium and phosphorus containing rare earth metals, the width of the gaps (5) extending through the screen being between 0.001 and 0.02 mm.
Claim 4
Dependent Claim
103 words
An X-ray intensifying screen manufactured of a material for transforming X-rays into light and of a binding agent, consisting essentially of the intensifying screen (1) being made of a homogeneous mixture of the material and the binding agent, the screen having the surface (2) adapted to be placed against X-ray film, and having gaps (5) adapted to be filled only with air for guiding light toward the X-ray film, the material being chosen from the group consisting of calcium tungstate, barium and phosphorus containing rare earth metals, the width of the gaps (5) extending through the screen being between 0.001 and 0.02 mm.
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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) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |