US3849649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable aperture x-ray shield
Assignee: Individual
•
Filing: 1973-03-26
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Granted: 1974-11-19
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Expires: 1993-03-26
Abstract
Abstract An X-ray shield of two layers of lead or other X-ray opaque material presenting a variable aperture to incident X-rays. A rectangular hole in one layer is rotated with respect to a rectangular hole in the second layer, thereby providing two alternative rectangular configurations of X-rays beyond the shield. A handle and setting indicators are provided to achieve proper rotation for desired apertures.
Inventors
- 👤 C Carey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:15
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/02; G21K1/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
107 words
A device for providing a variable aperture for X-rays comprising: a. a first layer of material opaque to X-rays having a rectangular opening therein; b. a second layer of material opaque to X-rays and having a rectangular opening therein; and c. positioning means for maintaining said layers in parallel planes and for permitting said layers to rotate relative to one another, said positioning means including aligning means enabling positioning of the opening of said first layer of material such that a line perpendicular to said second layer and passing through said rectangular opening of said second layer also passes through said rectangular opening of Said first layer.
Claim 2
Independent Claim
107 words
A device for providing a variable aperture for X-rays comprising: a. a first layer of material opaque to X-rays having a rectangular opening therein; b. a second layer of material opaque to X-rays and having a rectangular opening therein; and c. positioning means for maintaining said layers in parallel planes and for permitting said layers to rotate relative to one another, said positioning means including aligning means enabling positioning of the opening of said first layer of material such that a line perpendicular to said second layer and passing through said rectangular opening of said second layer also passes through said rectangular opening of Said first layer.
Claim 3
Dependent Claim
23 words
The device of claim 1 wherein said first layer includes a handle whereby rotation relative to said second layer can be readily effected.
Claim 4
Dependent Claim
17 words
The device of claim 2 wherein said first layer is a disc having a rectangular opening therein.
Claim 5
Dependent Claim
11 words
The device of claim 3 wherein said first layer is lead.
Claim 6
Dependent Claim
17 words
The device of claim 4 wherein said second layer is a disc having a rectangular opening therein.
Claim 7
Dependent Claim
11 words
The device of claim 5 wherein said second layer is lead.
Claim 8
Dependent Claim
32 words
The device of claim 6 wherein said positioning means and said aligning means include stops to insure rapid and accurate positioning of said first layer disc relative to said second layer disc.
Claim 9
Dependent Claim
110 words
The device of claim 7 wherein said positioning means and said aligning means consist of: a. a back plate of aluminum material, b. a ring of the thickness of said first layer disc and fitting around it, c. a front plate with an interior circular opening having a diameter larger than the longer diagonal of the rectangular openings in the said first and second layer discs but smaller than the diameter of said first layer disc, d. and an attaching means to rigidly connect said plates, said ring and said second layer disc, leaving said first layer disc free to rotate between said second layer disc and said front plate.
Claim 10
Dependent Claim
40 words
An apparatus consisting of: a. a source of X-ray radiation, b. an X-ray-sensitive element positioned near said source to receive X-ray radiation from said source, and c. the device of claim 1 interposed between said source and said receiving element.
Claim 11
Dependent Claim
12 words
The device of claim 9 wherein said X-ray-sensitive element is X-ray-sensitive film.
Claim 12
Dependent Claim
23 words
The device of claim 10 wherein said first layer includes a handle whereby rotation relative to said second layer can be readily effected.
Claim 13
Dependent Claim
17 words
The device of claim 11 wherein said first layer is a disc having a rectangular opening therein.
Claim 14
Dependent Claim
11 words
The device of claim 12 wherein said first layer is lead.
Claim 15
Dependent Claim
17 words
The device of claim 13 wherein said second layer is a disc having a rectangular opening therein.
Claim 16
Dependent Claim
11 words
The device of claim 14 wherein said second layer is lead.
Claim 17
Dependent Claim
32 words
The device of claim 15 wherein said positioning means and said aligning means includes stops to insure rapid and accurate positioning of said first layer disc relative to said second layer disc.
Claim 18
Dependent Claim
110 words
The device of claim 16 wherein said positioning means and said aligning means consist of: a. a back plate of aluminum material, b. a ring of the thickness of said first layer disc and fitting around it, c. a front plate with an interior circular opening having a diameter larger than the longer diagonal of the rectangular openings in the said first and second layer discs but smaller than the diameter of said first layer disc, d. and an attaching means to rigidly connect said plates, said ring and said second layer disc, leaving said first layer disc free to rotate between said second layer disc and said front plate.
References Cited (Backward Citations)
US2474422A
Cited
US3115580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |