US3679927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High power x-ray tube
Assignee: Varian Medical Systems Inc
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Filing: 1970-08-17
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Granted: 1972-07-25
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Expires: 1990-08-17
Abstract
Abstract An X-ray tube with a metal window and having increased power loading capabilities without undesirable overheating of the window, this being achieved by the use of a magnet which is arranged so that magnetic field lines pass over the window surface to reduce bombardment of the window with secondary or back-scattered electrons from the anode.
Inventors
- 👤 Thomas D Kirkendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:06
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/16; H01J35/18; H01J2235/00; H01J2235/16; H01J2235/165; H01J2235/168
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
An X-ray device comprising an X-ray tube including a housing having an anode made of non-magnetic material and a cathode therein, said anode having a cavity therein with its open end facing the cathode in predetermined spaced relation therewith, an X-ray generating target located within the cavity at the bottom thereof and having its effective surface inclined at an angle with respect to the axis of the tube, a port in a side wall of the anode through which a beam of X-rays from the target may pass, said cathode being positioned to direct electrons along said axis onto said surface of the target for the generation of X-rays therefrom, a metal window in said port, and magnet means positioned with respect to said window and producing a magnetic field within the anode having field lines extending transverse to the axis of the tube for reducing impingement on the window of electrons emitted or backscattered from the target.
Claim 2
Dependent Claim
158 words
An X-ray device comprising an X-ray tube including a housing having an anode made of non-magnetic material and a cathode therein, said anode having a cavity therein with its open end facing the cathode in predetermined spaced relation therewith, an X-ray generating target located within the cavity at the bottom thereof and having its effective surface inclined at an angle with respect to the axis of the tube, a port in a side wall of the anode through which a beam of X-rays from the target may pass, said cathode being positioned to direct electrons along said axis onto said surface of the target for the generation of X-rays therefrom, a metal window in said port, and magnet means positioned with respect to said window and producing a magnetic field within the anode having field lines extending transverse to the axis of the tube for reducing impingement on the window of electrons emitted or backscattered from the target.
Claim 3
Dependent Claim
41 words
An X-ray device as set forth in claim 1 wherein said magnet means comprises a magnet so located that the magnetic field lines pass over the interior surface of the window and the effective surface of the target substantially parallel thereto.
Claim 4
Dependent Claim
49 words
An X-ray device as set forth in claim 2 wherein said magnet comprises pole pieces located at opposite sides of the window and disposed in a plane perpendicular to said axis and the magnetic field lines also extend perpendicular to the flow of electrons between the cathode and target.
References Cited (Backward Citations)
US1203495A
Cited
US1946312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |