US5259014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray tube
Assignee: US Philips Corp
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Filing: 1991-12-12
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Granted: 1993-11-02
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Expires: 2011-12-12
Abstract
Abstract An X-ray tube has a focal spot which can be varied in respect of position or size. A cathode has dimensions adapted to the variation of the focal spot, and between the cathode and the anode of the X-ray tube there is a grid arrangement which comprises a number of grid elements in one plane, which elements are electrically insulated from one another, and whose potential is independently controlled.
Inventors
- 👤 Horst Brettschneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:43
CPC Classifications
H; H01; H01J; H01J35/00; H01J35/02; H01J35/14; H01J35/153; H01J35/04; H01J35/06; H01J35/066; H01J35/147
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
An X-ray tube for generating a variable focal spot, comprising: a cathode whose dimensions are adapted for focal spot dimension variation, an anode, and a grid arrangement between the cathode and the anode of the X-ray tube, said grid arrangement comprising a plurality of coplanar grid elements, said grid elements being electrically insulated from one another and having respective potentials mutually independently controllable.
Claim 2
Dependent Claim
63 words
An X-ray tube for generating a variable focal spot, comprising: a cathode whose dimensions are adapted for focal spot dimension variation, an anode, and a grid arrangement between the cathode and the anode of the X-ray tube, said grid arrangement comprising a plurality of coplanar grid elements, said grid elements being electrically insulated from one another and having respective potentials mutually independently controllable.
Claim 3
Dependent Claim
61 words
An X-ray tube as claimed in claim 1 wherein for the displacement of the focal spot in a direction, the grid arrangement comprises grid elements adjacently arranged in said displacement direction and adapted to be successively connected to a potential such that the electrons emitted by the cathode pass the grid at the area of the grid element receiving said potential.
Claim 4
Dependent Claim
22 words
An X-ray tube as claimed in claim 1 including means for constructing the anode and the cathode as a rotary-anode X-ray tube.
Claim 5
Dependent Claim
22 words
An X-ray tube as claimed in claim 2 including means for constructing the anode and the cathode as a rotary-anode X-ray tube.
References Cited (Backward Citations)
US4002917A
Cited
US5142652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-11-01 | 1997-05-03 | 1997-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-01 | 2001-05-03 | 2001-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-01 | 2005-05-03 | 2005-11-02 | $7700.00 | Window Closed / Lapsed |