Patent US4608707A successfully refreshed from Google Patents.
US4608707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotating anode X-ray tube provided with a charge flow device
Assignee: THOMSON-CGR 13
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Filing: 1984-06-22
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Granted: 1986-08-26
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Expires: 2004-06-22
Abstract
Abstract The invention relates to a rotating anode X-ray tube provided with a charge flow device, in which the anode current of the tube is established between an emitter coupled in rotation to the rotating anode, as well as a fixed collector. The latter is electrically connected to high voltage and the emitter is electrically connected to the rotating anode, having at least one part with a tapered end constituting an electron emissive zone. These electrons are trapped by the collector, so as to establish the anode current of the tube without any material contact between the emitter and the collector. The invention is applicable to radiology in general and more specifically to medical diagnosis.
Inventors
- 👤 Emile Gabbay
- 👤 Andre Plessis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:08
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/04; H01J35/08; H01J35/10; H01J35/101; H01J35/1017; H01J35/103
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A rotating anode X-ray tube provided with a charge flow device mass for generating the anode current of the tube, the latter being of the type having magnetic bearings, said device means being provided with an electron emitter electrically connected to a rotating anode and an electron collector electrically connected to a high voltage positive pole of the tube, wherein the emitter, coupled in rotation to the rotating anode, comprises at least one part having a tapered end, constituting an electron emissive zone where electrons are emitted said electrons being trapped by the collector, said collector being maintained in a fixed position, said device means establishing the anode current between the emitter and the collector without material contact between the latter and without requiring heating of the emitter.
Claim 2
Dependent Claim
128 words
A rotating anode X-ray tube provided with a charge flow device mass for generating the anode current of the tube, the latter being of the type having magnetic bearings, said device means being provided with an electron emitter electrically connected to a rotating anode and an electron collector electrically connected to a high voltage positive pole of the tube, wherein the emitter, coupled in rotation to the rotating anode, comprises at least one part having a tapered end, constituting an electron emissive zone where electrons are emitted said electrons being trapped by the collector, said collector being maintained in a fixed position, said device means establishing the anode current between the emitter and the collector without material contact between the latter and without requiring heating of the emitter.
Claim 3
Dependent Claim
16 words
An X-ray tube according to claim 1, wherein the tapered end is constituted by a tip.
Claim 4
Dependent Claim
22 words
An X-ray tube according to claim 1, wherein the tapered end is constituted by an edge of a tapered plate or blade.
Claim 5
Dependent Claim
17 words
An X-ray tube according to any one of the preceding claims, wherein the tapered end is metallic.
Claim 6
Dependent Claim
21 words
An X-ray tube according to claim 1, wherein the tapered end is made from a material having a low atomic number.
Claim 7
Dependent Claim
23 words
An X-ray tube according to claim 5, wherein the tapered end is made from beryllium or boron, or one of the compounds thereof.
Claim 8
Dependent Claim
27 words
An X-ray tube according to claim 1, wherein the emitter is rotated about a longitudinal axis, the tapered end rotating facing a collecting face of the collector.
Claim 9
Dependent Claim
13 words
An X-ray tube according to claim 7, wherein the collecting face is flat.
Claim 10
Dependent Claim
21 words
An X-ray tube according to claim 1, wherein the collector is hollow, centered on the longitudinal axis and contains the emitter.
Claim 11
Dependent Claim
15 words
An X-ray tube according to claim 9, wherein the collector has a curved collecting face.
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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |