US4646340A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scatter radiation grid drive
Assignee: US Philips Corp
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Filing: 1984-04-30
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Granted: 1987-02-24
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Expires: 2004-04-30
Abstract
Abstract The invention relates to a scatter grid drive for oscillating a scatter grid back and forth during an exposure. The reversal point, at which the direction of movement of grid is reversed, is passed so quickly that there is little risk of imaging the grid in the radiograph.
Inventors
- 👤 Manfred Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:10
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/025; A; A61; A61B; A61B6/00; A61B6/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
126 words
A device for reducing scattered radiation comprising: a scatter grid; a lever arm having first and second opposite ends, the first end being pivotably connected to the scatter grid; a roller rotatably connected to the second end of the lever arm; a cam having a surface; and means for pressing the roller against the cam surface by applying a force to the first end of the lever arm; characterized in that: the roller has a radius, and the lever has a length between the first and second ends which is equal to or only slightly larger than the radius of the roller; and the cam surface has a slope which changes discontinuously at a point where the roller has a maximum displacement against the pressing means.
Claim 2
Independent Claim
126 words
A device for reducing scattered radiation comprising: a scatter grid; a lever arm having first and second opposite ends, the first end being pivotably connected to the scatter grid; a roller rotatably connected to the second end of the lever arm; a cam having a surface; and means for pressing the roller against the cam surface by applying a force to the first end of the lever arm; characterized in that: the roller has a radius, and the lever has a length between the first and second ends which is equal to or only slightly larger than the radius of the roller; and the cam surface has a slope which changes discontinuously at a point where the roller has a maximum displacement against the pressing means.
Claim 3
Dependent Claim
16 words
A device as claimed in claim 1, characterized in that the cam is a hollow cylinder.
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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |