US3585391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brightness stabilizer with improved image quality
Assignee: Westinghouse Electric Corp
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Filing: 1969-09-24
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Granted: 1971-06-15
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Expires: 1989-09-24
Abstract
Abstract A brightness stabilizer which permits the radiologists to operate X-ray apparatus in fluoroscopic modes or in other modes of operation where an image intensifier is used, such as cine or 70-mm. spotfilms, in such a way as to expose the patient to the lowest level of radiation possible as a function of the type of X-ray image required.
Inventors
- 👤 Melvin P Siedband
- 👤 Philip A Duffy Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:06
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/26; H05G1/30; H05G1/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
20 words
The combination of claim 1 further comprising means for translating said predetermined range upward as the accelerating voltage is increased.
Claim 2
Dependent Claim
51 words
The combination of claim 2 wherein the controlling means includes a motor-driven autotransformer and the translating means includes means gang operated with said autotransformer for decreasing the gain of said controlling means to thereby increase the magnitude of the extremes of anode current for translating said predetermined range of anode current.
Claim 3
Dependent Claim
43 words
The combination of claim 1 wherein said last-mentioned means includes first means for increasing the accelerating voltage when the beam current exceeds said predetermined range and second means for decreasing the accelerating voltage when the beam current is less than said predetermined range.
Claim 4
Dependent Claim
17 words
The combination of claim 4 wherein said last-mentioned means further includes means for monitoring the beam current.
Claim 5
Dependent Claim
43 words
The combination of claim 5 wherein said means for monitoring includes voltage divider means for selectively rendering said first means and said second means operative and current amplifier means responsive to the monitored anode current for controlling voltage across said voltage divider means.
Claim 6
Dependent Claim
26 words
The combination of claim 6 wherein said current amplifier means actuates said voltage divider means only when the monitored anode current is outside said predetermined range.
Claim 7
Dependent Claim
17 words
The combination of claim 5 wherein said means for monitoring the beam current includes a diode bridge.
Claim 8
Dependent Claim
21 words
The combination of claim 4 wherein said first means includes a semiconductor switch and said second means includes a Zener diode.
Claim 9
Dependent Claim
45 words
The combination of claim 4 wherein said last-mentioned means further includes a motor-controlled autotransformer and switching means for energizing said motor-controlled autotransformer to increase the accelerating voltage when said first means is conductive and to decrease the accelerating voltage when said second means is conductive.
Claim 10
Dependent Claim
35 words
The combination of claim 1 further comprising operating mode selection means for setting brightness levels and magnitude ranges of filament current, anode current, and accelerating voltage to said X-ray tube for fluoroscopic and cinefluoroscopic operation.
Claim 11
Dependent Claim
18 words
The combination of claim 1 including means for presetting said predetermined range for different modes of fluoroscopic operation.
Claim 12
Dependent Claim
30 words
The combination of claim 1 including a time delay circuit for enabling said last-mentioned means after sufficient time has elapsed to allow said stabilizer means to reach steady state conditions.
References Cited (Backward Citations)
US2962594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |