US3875411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray apparatus
Assignee: US Philips Corp
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Filing: 1973-08-29
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Granted: 1975-04-01
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Expires: 1993-08-29
Abstract
Abstract X-ray apparatus provided with an excessive-size indication which gives a signal to the radiologist when the cross-sectional area of the beam used for fluoroscopic examination exceeds the size of the radiograph to be made.
Inventors
- 👤 Heinz-Peter Kunert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:59
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/06; G; G21; G21K; G21K1/00; G21K1/02; G21K1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
232 words
In X-ray apparatus having both fluoroscopy and radiography capability and having an adjustable diaphragm controlling the Xray beam size, apparatus for controlling said adjustable diaphragm and for alerting an operator when the display during fluoroscopy is larger than what would be recorded during radiography, comprising: a servo system controlling said adjustable diaphragm in accordance with an input signal supplied thereto; means for producing a first signal which when supplied as said input signal to said servo system causes said servo system to adjust said diaphragm so as to conform the size of the X-ray beam to the size of the radiographic film in said X-ray apparatus; means for producing a manually variable second signal which when supplied as said input signal to said servo system causes said servo system to adjust said diaphragm to a variable size in accordance with said manually variable second signal; switching means for supplying as said input signal to said servo system during fluoroscopy said second signal and during radiography said first signal; comparing means responsive to said first and second signals during fluoroscopy for producing a suitable output signal when the beam size which corresponds to said second signal exceeds the beam size which corresponds to said first signal; and visual indicating means responsive to said output signal for alerting an operator that the display during fluoroscopy is larger than what would be recorded during radiography.
Claim 2
Dependent Claim
232 words
In X-ray apparatus having both fluoroscopy and radiography capability and having an adjustable diaphragm controlling the Xray beam size, apparatus for controlling said adjustable diaphragm and for alerting an operator when the display during fluoroscopy is larger than what would be recorded during radiography, comprising: a servo system controlling said adjustable diaphragm in accordance with an input signal supplied thereto; means for producing a first signal which when supplied as said input signal to said servo system causes said servo system to adjust said diaphragm so as to conform the size of the X-ray beam to the size of the radiographic film in said X-ray apparatus; means for producing a manually variable second signal which when supplied as said input signal to said servo system causes said servo system to adjust said diaphragm to a variable size in accordance with said manually variable second signal; switching means for supplying as said input signal to said servo system during fluoroscopy said second signal and during radiography said first signal; comparing means responsive to said first and second signals during fluoroscopy for producing a suitable output signal when the beam size which corresponds to said second signal exceeds the beam size which corresponds to said first signal; and visual indicating means responsive to said output signal for alerting an operator that the display during fluoroscopy is larger than what would be recorded during radiography.
Claim 3
Dependent Claim
74 words
In X-ray apparatus having both fluoroscopy and radiography capability and having a diaphragm adjustable separately in two dimensions controlling the X-ray beam size separately in two dimensions, apparatus for separately controlling said diaphragm in each of said two dimensions and for alerting an operator when the display during fluoroscopy is larger in either of said dimensions than what would be recorded during radiography, comprising for each of said two dimensions the elements of claim
Claim 4
Dependent Claim
41 words
Apparatus as defined in claim 2 wherein said visual indicating means for each of said two dimensions is the same visual indicating means, said same visual indicating means being responsive to said output signal corresponding to either of said two dimensions.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |