US3706883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiological apparatus for measuring length which comprises two relatively movable radio opaque marks
Assignee: Individual
•
Filing: 1969-11-21
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Granted: 1972-12-19
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Expires: 1989-11-21
Abstract
Abstract An elongated probe including at least one segment of X-rayopaque material of known length along the dimension parallel to the axis of the probe is used to provide a standard scale for dimensional determination of objects not accessible to direct measurement. The probe is brought into proximity to the object to be measured, X-rays illuminate the object and probe to produce an image, and the image size of the X-ray-opaque material, or of known intervals between adjacent X-ray-opaque segments, is compared with the image size of the object to be measured.
Inventors
- 👤 Kevin M Mcintyre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:23
CPC Classifications
G; G01; G01B; G01B15/00; G03; G03B; G03B42/00; G03B42/02; G03B42/028
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
Apparatus for the measurement of a dimension of objects illuminated by radiant energy comprising, insertable means including at least one segment of radio-opaque material of known dimension for insertion into a location beside an object to be measured, said insertable means comprising a tubular outer element surrounding an inner element adapted for axial movement with respect thereto, said outer element comprising at least one radio-opaque segment, said inner element comprising at least one radio-opaque segment, whereby axial movement of said inner element relative to said outer element can provide a nonradio-opaque region of said probe corresponding to the axial spacing between said radioopaque segment of said outer element and said radio-opaque segment of said inner element, and means for measuring axial movement of said inner element relative to said outer element.
Claim 2
Dependent Claim
131 words
Apparatus for the measurement of a dimension of objects illuminated by radiant energy comprising, insertable means including at least one segment of radio-opaque material of known dimension for insertion into a location beside an object to be measured, said insertable means comprising a tubular outer element surrounding an inner element adapted for axial movement with respect thereto, said outer element comprising at least one radio-opaque segment, said inner element comprising at least one radio-opaque segment, whereby axial movement of said inner element relative to said outer element can provide a nonradio-opaque region of said probe corresponding to the axial spacing between said radioopaque segment of said outer element and said radio-opaque segment of said inner element, and means for measuring axial movement of said inner element relative to said outer element.
Claim 3
Dependent Claim
24 words
The apparatus of claim 1 and further comprising a plurality of radio-opaque segments of known dimension spaced at known intervals on said insertable means.
Claim 4
Dependent Claim
21 words
The apparatus of claim 2 wherein said segments are equal to each other and said intervals are equal to each other.
Claim 5
Dependent Claim
16 words
The apparatus of claim 3 wherein said segments are of the same dimension as said intervals.
Claim 6
Dependent Claim
29 words
The apparatus of claim 2 wherein the length of said Segments is an integral number of millimeters and said intervals are also equal to an integral number of millimeters.
Claim 7
Dependent Claim
23 words
The apparatus of claim 1 wherein said insertable means is a catheter having a non-radio-opaque wall into which is incorporated said radio-opaque material.
Claim 8
Dependent Claim
110 words
The apparatus of claim 1 wherein said outer element comprises a plurality of radio-opaque segments of equal length axially spaced at equal outer-element intervals and said inner element comprises a plurality of radio-opaque segments of length equal to said outer-element intervals spaced at intervals equal to said length of said outer element segments, whereby said inner element can be moved from a first position wherein the radio-opaque segments of said inner element mask the non-radio-opaque intervals between the radio-opaque segments of said outer element and further positions wherein non-radio-opaque regions are created of length equal to the magnitude of the axial movement of said inner element from said first position.
Claim 9
Dependent Claim
37 words
The apparatus of claim 7 wherein said outer element and said inner element each comprise a plurality of radio-opaque segments of equal length alternating with non-radio-opaque intervals of length equal to the length of said radio-opaque segments.
References Cited (Backward Citations)
US2650308A
Cited
US3001070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |